sudo: false
language: c

matrix:
  include:
    - os: linux
      dist: trusty
      compiler: clang
      env:
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: clang
      env:
        - CFGOPT=--disable-shared
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc
      env:
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc
      env:
        - CFGOPT=--disable-shared
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc-4.9
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-4.9
      env:
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc-5
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-5
      env:
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc-6
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-6
      env:
        - BUILD_DIR=unix
    - os: linux
      dist: trusty
      compiler: gcc-7
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-7
      env:
        - BUILD_DIR=unix
    - os: osx
      osx_image: xcode8
      env:
        - BUILD_DIR=unix
    - os: osx
      osx_image: xcode8
      env:
        - BUILD_DIR=macosx
        - NO_DIRECT_CONFIGURE=1
    - os: osx
      osx_image: xcode9
      env:
        - BUILD_DIR=macosx
        - NO_DIRECT_CONFIGURE=1
    - os: osx
      osx_image: xcode10
      env:
        - BUILD_DIR=macosx
        - NO_DIRECT_CONFIGURE=1
### C builds not currently supported on Windows instances
#    - os: windows
#      env:
#        - BUILD_DIR=win
### ... so proxy with a Mingw cross-compile
# Test with mingw-w64 (32 bit)
    - os: linux
      dist: trusty
      compiler: i686-w64-mingw32-gcc
      addons:
        apt:
          packages:
            - gcc-mingw-w64-base
            - binutils-mingw-w64-i686
            - gcc-mingw-w64-i686
            - gcc-mingw-w64
            - gcc-multilib
            - wine
      env:
        - BUILD_DIR=win
        - CFGOPT=--host=i686-w64-mingw32
        - NO_DIRECT_TEST=1
# Test with mingw-w64 (64 bit)
    - os: linux
      dist: trusty
      compiler: x86_64-w64-mingw32-gcc
      addons:
        apt:
          packages:
            - gcc-mingw-w64-base
            - binutils-mingw-w64-x86-64
            - gcc-mingw-w64-x86-64
            - gcc-mingw-w64
            - wine
      env:
        - BUILD_DIR=win
        - CFGOPT="--host=x86_64-w64-mingw32 --enable-64bit"
        - NO_DIRECT_TEST=1

before_install:
  - export ERROR_ON_FAILURES=1
  - cd ${BUILD_DIR}
install:
  - test -n "$NO_DIRECT_CONFIGURE" || ./configure ${CFGOPT}
script:
  - make
  # The styles=develop avoids some weird problems on OSX
  - test -n "$NO_DIRECT_TEST" || make test styles=develop

A NOTE ON THE CHANGELOG:
Starting in early 2011, Tcl source code has been under the management of
fossil, hosted at https://core.tcl-lang.org/tcl/ .  Fossil presents a "Timeline"
view of changes made that is superior in every way to a hand edited log file.
Because of this, many Tcl developers are now out of the habit of maintaining
this log file.  You may still find useful things in it, but the Timeline is
a better first place to look now.
============================================================================

2013-09-19  Don Porter  <dgp@users.sourceforge.net>

README:  Tcl
    This is the Tcl 8.6.9 source distribution.
	http://sourceforge.net/projects/tcl/files/Tcl/
    You can get any source release of Tcl from the URL above.

Contents
--------
    1. Introduction
    2. Documentation

Tcl can also be used for a variety of web-related tasks and for creating
powerful command languages for applications.

Tcl is maintained, enhanced, and distributed freely by the Tcl community.
Source code development and tracking of bug reports and feature requests
takes place at:

	http://core.tcl-lang.org/

Tcl/Tk release and mailing list services are hosted by SourceForge:

	http://sourceforge.net/projects/tcl/

with the Tcl Developer Xchange hosted at:

	http://www.tcl-lang.org/

Tcl is a freely available open source package.  You can do virtually
anything you like with it, such as modifying it, redistributing it,
and selling it either in whole or in part.  See the file
"license.terms" for complete information.

2. Documentation
----------------

Extensive documentation is available at our website.
The home page for this release, including new features, is
	http://www.tcl-lang.org/software/tcltk/8.6.html

Detailed release notes can be found at the file distributions page
by clicking on the relevant version.
	http://sourceforge.net/projects/tcl/files/Tcl/

Information about Tcl itself can be found at
	http://www.tcl-lang.org/about/

There have been many Tcl books on the market.  Many are mentioned in the Wiki:
	http://wiki.tcl-lang.org/_/ref?N=25206

To view the complete set of reference manual entries for Tcl 8.6 online,
visit the URL:
	http://www.tcl-lang.org/man/tcl8.6/

2a. Unix Documentation
----------------------

The "doc" subdirectory in this release contains a complete set of
reference manual entries for Tcl.  Files with extension ".1" are for
programs (for example, tclsh.1); files with extension ".3" are for C

3. Compiling and installing Tcl
-------------------------------

There are brief notes in the unix/README, win/README, and macosx/README about
compiling on these different platforms.  There is additional information
about building Tcl from sources at

	http://www.tcl-lang.org/doc/howto/compile.html

4. Development tools
---------------------------

ActiveState produces a high quality set of commercial quality development
tools that is available to accelerate your Tcl application development.
Tcl Dev Kit builds on the earlier TclPro toolset and provides a debugger,

see the "Support and bug fixes" section below.

6. Tcl'ers Wiki
---------------

A Wiki-based open community site covering all aspects of Tcl/Tk is at:

	http://wiki.tcl-lang.org/

It is dedicated to the Tcl programming language and its extensions.  A
wealth of useful information can be found there.  It contains code
snippets, references to papers, books, and FAQs, as well as pointers to
development tools, extensions, and applications.  You can also recommend
additional URLs by editing the wiki yourself.

8. Support and Training
------------------------

We are very interested in receiving bug reports, patches, and suggestions
for improvements.  We prefer that you send this information to us as
tickets entered into our tracker at:

	http://core.tcl-lang.org/tcl/reportlist

We will log and follow-up on each bug, although we cannot promise a
specific turn-around time.  Enhancements may take longer and may not happen
at all unless there is widespread support for them (we're trying to
slow the rate at which Tcl/Tk turns into a kitchen sink).  It's very
difficult to make incompatible changes to Tcl/Tk at this point, due to
the size of the installed base.

The Tcl community is too large for us to provide much individual support
for users.  If you need help we suggest that you post questions to
comp.lang.tcl.  We read the newsgroup and will attempt to answer esoteric
questions for which no one else is likely to know the answer.  In addition,
see the following Web site for links to other organizations that offer
Tcl/Tk training:

	http://wiki.tcl-lang.org/training

9. Tracking Development
-----------------------

Tcl is developed in public.  To keep an eye on how Tcl is changing, see
	http://core.tcl-lang.org/

10. Thank You
-------------

We'd like to express our thanks to the Tcl community for all the
helpful suggestions, bug reports, and patches we have received.
Tcl/Tk has improved vastly and will continue to do so with your help.

2017-12-06 (bug)[ce3a21] file normalize failure when tail is empty (porter)

2017-12-08 (new)[TIP 477] nmake build system reform (nadkarni)

2017-12-19 (bug)[586e71] EvalObjv exception handling at level #0 (sebres,porter)

--- Released 8.6.8, December 22, 2017 --- http://core.tcl.tk/tcl/ for details

2018-02-11 (enhance) stop blocking conversion of object to/from class (coulter)

2018-02-12 (enhance) NR-enable [package require] (coulter)

2018-02-14 (bug)[9fd5c6] crash in object deletion, test oo-11.5 (coulter)

2018-02-14 (bug)[3c32a3] crash deleting object with class mixed in (coulter)

2018-02-15 (platform) stop using -lieee, removed from glibc-2.27 (porter)
***POTENTIAL INCOMPATIBILITY for math programs that embed Tcl***

2018-02-23 (bug)[8e6a9a] bad binary [string match], test string-11.55 (porter)

2018-03-05 (bug)[1873ea] repair multi-thread std channel init (sebres)

2018-03-09 (bug)[db36fa] broken bytecode for index values (porter)

2018-03-13 (bug) broken compiled [string replace], test string-14.19 (porter)

2018-03-14 (bug) [string trim*] engine crashed on invalid UTF (sebres)

2018-04-17 (bug) missing trace in compiled [array set], test var-20.11 (porter)

2018-04-22 (bug)[46a241] crash in unset array with search, var-13.[23] (goth)

2018-04-30 (bug)[27b682] race made [file delete] raise "no such file" (sebres)

2018-06-04 (bug)[925643] 32/64 cleanup of filesystem DIR operations (sebres)

2018-06-18 (bug) leaks in TclSetEnv and env cache (coulter)

2018-06-24 (bug)[3592747] [yieldto] dying namespace, tailcall-14.1 (coulter)

2018-07-09 (bug)[270f78] race in [file mkdir] (sebres)

2018-07-12 (bug)[3f7af0] [file delete] raised "permission denied" (sebres)

2018-07-26 (bug)[d051b7] overflow crash in [format] (sebres)

2018-08-29 revised quoting of [exec] args in generated command line (sebres)
***POTENTIAL INCOMPATIBILITY***

2018-09-20 HTTP Keep-Alive with pipelined requests (nash)
=> http 2.9.0

2018-09-27 (new)[TIP 505] [lreplace] accepts all out of range indices (porter)

2018-10-04 (bug) Prevent crash from NULL keyName (nijtmans)
=> registry 1.3.3

2018-10-26 (enhance) advance dde version (nijtmans)
=> dde 1.4.1

2018-10-27 tzdata updated to Olson's tzdata2018g (jima)

2018-10-29 Update tcltest package for Travis support (fellows)
=> tcltest 2.5.0

2018-11-09 (bug)[35a8f1] overlong string length of some lists (owens)

2018-11-16 (bug)[00d04c] Repair [binary encode base64] (sebres)

- Released 8.6.9, November 16, 2018 - details at http://core.tcl-lang.org/tcl/ -

extern void		exit(int status);
extern int		free(char *blockPtr);
extern char *		getenv(const char *name);
extern char *		malloc(unsigned int numBytes);
extern void		qsort(void *base, int n, int size, int (*compar)(
			    const void *element1, const void *element2));
extern char *		realloc(char *ptr, unsigned int numBytes);

extern long		strtol(const char *string, char **endPtr, int base);
extern unsigned long	strtoul(const char *string, char **endPtr, int base);

#endif /* _STDLIB */

                      0,NULL,OPEN_EXISTING,0,NULL);
  GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite);
  DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal);
  LocalFileTimeToFileTime(&ftLocal,&ftm);
  SetFileTime(hFile,&ftm,&ftLastAcc,&ftm);
  CloseHandle(hFile);
#else
#if defined(unix) || defined(__APPLE__)
  struct utimbuf ut;
  struct tm newdate;
  newdate.tm_sec = tmu_date.tm_sec;
  newdate.tm_min=tmu_date.tm_min;
  newdate.tm_hour=tmu_date.tm_hour;
  newdate.tm_mday=tmu_date.tm_mday;
  newdate.tm_mon=tmu_date.tm_mon;

        FindClose(hFind);
        ret = 1;
      }
  }
  return ret;
}
#else
#if defined(unix) || defined(__APPLE__)
uLong filetime(f, tmzip, dt)
    char *f;               /* name of file to get info on */
    tm_zip *tmzip;         /* return value: access, modific. and creation times */
    uLong *dt;             /* dostime */
{
  int ret=0;
  struct stat s;        /* results of stat() */

If a format string lacks a \fB%z\fR or \fB%Z\fR format group,
it is possible for the time to be ambiguous because it appears twice
in the same day, once without and once with Daylight Saving Time.
If this situation occurs, the first occurrence of the time is chosen.
(For this reason, it is wise to have the input string contain the
time zone when converting local times.  This caveat does not apply to
UTC times.)
.PP
If the interpretation of the groups yields an impossible time because
a field is out of range, enough of that field's unit will be added to
or subtracted from the time to bring it in range. Thus, if attempting to
scan or format day 0 of the month, one day will be subtracted from day
1 of the month, yielding the last day of the previous month.
.PP
If the interpretation of the groups yields an impossible time because
a Daylight Saving Time change skips over that time, or an ambiguous
time because a Daylight Saving Time change skips back so that the clock
observes the given time twice, and no time zone specifier (\fB%z\fR
or \fB%Z\fR) is present in the format, the time is interpreted as
if the clock had not changed. 
.SH "FORMAT GROUPS"
.PP
The following format groups are recognized by the \fBclock scan\fR and
\fBclock format\fR commands.
.TP
\fB%a\fR
On output, receives an abbreviation (\fIe.g.,\fR \fBMon\fR) for the day

.QW \fB@\0\fIfileId\fR
notation, does not work.  When reading from a socket, a 16-bit DOS
application will hang and a 32-bit application will return immediately with
end-of-file.  When either type of application writes to a socket, the
information is instead sent to the console, if one is present, or is
discarded.
.RS
.PP
Note that the current escape resp. quoting of arguments for windows works only
with executables using CommandLineToArgv, CRT-library or similar, as well as
with the windows batch files (excepting the newline, see below).
Although it is the common escape algorithm, but, in fact, the way how the
executable parses the command-line (resp. splits it into single arguments)
is decisive.
.PP
Unfortunately, there is currently no way to supply newline character within
an argument to the batch files (\fB.cmd\fR or \fB.bat\fR) or to the command
processor (\fBcmd.exe /c\fR), because this causes truncation of command-line
(also the argument chain) on the first newline character.
But it works properly with an executable (using CommandLineToArgv, etc).
.PP
The Tk console text widget does not provide real standard IO capabilities.
Under Tk, when redirecting from standard input, all applications will see an
immediate end-of-file; information redirected to standard output or standard
error will be discarded.
.PP
Either forward or backward slashes are accepted as path separators for

.CS
\fBexec\fR cmp.bat somefile.c -o somefile
.CE
.PP
With the file \fIcmp.bat\fR looking something like:
.PP
.CS
@gcc %*
.CE
or like another variant using single parameters:
.CS
@gcc %1 %2 %3 %4 %5 %6 %7 %8 %9
.CE
.SS "WORKING WITH COMMAND BUILT-INS"
.PP
Sometimes you need to be careful, as different programs may have the
same name and be in the path. It can then happen that typing a command
at the DOS prompt finds \fIa different program\fR than the same

'\"
'\" Copyright (c) 1995-1997 Sun Microsystems, Inc.
'\" Copyright (c) 1998-2000 by Ajuba Solutions.
'\" Copyright (c) 2004 ActiveState Corporation.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH "http" n 2.9 http "Tcl Bundled Packages"
.so man.macros
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
http \- Client-side implementation of the HTTP/1.1 protocol
.SH SYNOPSIS
\fBpackage require http ?2.8?\fR
.\" See Also -useragent option documentation in body!
.sp
\fB::http::config ?\fI\-option value\fR ...?
.sp
\fB::http::geturl \fIurl\fR ?\fI\-option value\fR ...?
.sp
\fB::http::formatQuery\fR \fIkey value\fR ?\fIkey value\fR ...?
.sp
\fB::http::quoteString\fR \fIvalue\fR
.sp
\fB::http::reset\fR \fItoken\fR ?\fIwhy\fR?
.sp
\fB::http::wait \fItoken\fR
.sp
\fB::http::status \fItoken\fR
.sp

.sp
\fB::http::error \fItoken\fR
.sp
\fB::http::cleanup \fItoken\fR
.sp
\fB::http::register \fIproto port command\fR
.sp
\fB::http::registerError \fIport\fR ?\fImessage\fR?
.sp
\fB::http::unregister \fIproto\fR
.BE
.SH DESCRIPTION
.PP
The \fBhttp\fR package provides the client side of the HTTP/1.1
protocol, as defined in RFC 7230 to RFC 7235, which supersede RFC 2616.
The package implements the GET, POST, and HEAD operations
of HTTP/1.1.  It allows configuration of a proxy host to get through
firewalls.  The package is compatible with the \fBSafesock\fR security
policy, so it can be used by untrusted applets to do URL fetching from
a restricted set of hosts. This package can be extended to support
additional HTTP transport protocols, such as HTTPS, by providing
a custom \fBsocket\fR command, via \fB::http::register\fR.

\fB\-accept\fR \fImimetypes\fR
.
The Accept header of the request.  The default is */*, which means that
all types of documents are accepted.  Otherwise you can supply a
comma-separated list of mime type patterns that you are
willing to receive.  For example,
.QW "image/gif, image/jpeg, text/*" .
.TP
\fB\-pipeline\fR \fIboolean\fR
.
Specifies whether HTTP/1.1 transactions on a persistent socket will be
pipelined.  See the \fBPERSISTENT SOCKETS\fR section for details. The default
is 1.
.TP
\fB\-postfresh\fR \fIboolean\fR
.
Specifies whether requests that use the \fBPOST\fR method will always use a
fresh socket, overriding the \fB-keepalive\fR option of
command \fBhttp::geturl\fR.  See the \fBPERSISTENT SOCKETS\fR section for details.
The default is 0.
.TP
\fB\-proxyhost\fR \fIhostname\fR
.
The name of the proxy host, if any.  If this value is the
empty string, the URL host is contacted directly.
.TP
\fB\-proxyport\fR \fInumber\fR

to determine if a proxy is required for a given host.  One argument, a
host name, is added to \fIcommand\fR when it is invoked.  If a proxy
is required, the callback should return a two-element list containing
the proxy server and proxy port.  Otherwise the filter should return
an empty list.  The default filter returns the values of the
\fB\-proxyhost\fR and \fB\-proxyport\fR settings if they are
non-empty.
.TP
\fB\-repost\fR \fIboolean\fR
.
Specifies what to do if a POST request over a persistent connection fails
because the server has half-closed the connection.  If boolean \fBtrue\fR, the
request
will be automatically retried; if boolean \fBfalse\fR it will not, and the
application
that uses \fBhttp::geturl\fR is expected to seek user confirmation before
retrying the POST.  The value \fBtrue\fR should be used only under certain
conditions. See the \fBPERSISTENT SOCKETS\fR section for details. The
default is 0.
.TP
\fB\-urlencoding\fR \fIencoding\fR
.
The \fIencoding\fR used for creating the x-url-encoded URLs with
\fB::http::formatQuery\fR and \fB::http::quoteString\fR.
The default is \fButf-8\fR, as specified by RFC
2718.  Prior to http 2.5 this was unspecified, and that behavior can be
returned by specifying the empty string (\fB{}\fR), although
\fIiso8859-1\fR is recommended to restore similar behavior but without the
\fB::http::formatQuery\fR or \fB::http::quoteString\fR
throwing an error processing non-latin-1 characters.
.TP
\fB\-useragent\fR \fIstring\fR
.
The value of the User-Agent header in the HTTP request.  In an unsafe
interpreter, the default value depends upon the operating system, and
the version numbers of \fBhttp\fR and \fBTcl\fR, and is (for example)
.QW "\fBMozilla/5.0 (Windows; U; Windows NT 10.0) http/2.8.12 Tcl/8.6.8\fR" .
A safe interpreter cannot determine its operating system, and so the default
in a safe interpreter is to use a Windows 10 value with the current version
numbers of \fBhttp\fR and \fBTcl\fR.
.TP
\fB\-zip\fR \fIboolean\fR
.
If the value is boolean \fBtrue\fR, then by default requests will send a header
.QW "\fBAccept-Encoding: gzip,deflate,compress\fR" .
If the value is boolean \fBfalse\fR, then by default this header will not be sent.
In either case the default can be overridden for an individual request by
supplying a custom \fBAccept-Encoding\fR header in the \fB-headers\fR option
of \fBhttp::geturl\fR. The default is 1.
.RE
.TP
\fB::http::geturl\fR \fIurl\fR ?\fIoptions\fR?
.
The \fB::http::geturl\fR command is the main procedure in the package.
The \fB\-query\fR option causes a POST operation and
the \fB\-validate\fR option causes a HEAD operation;

.CS
Pragma: no-cache
.CE
.RE
.TP
\fB\-keepalive\fR \fIboolean\fR
.
If boolean \fBtrue\fR, attempt to keep the connection open for servicing
multiple requests.  Default is 0.
.TP
\fB\-method\fR \fItype\fR
.
Force the HTTP request method to \fItype\fR. \fB::http::geturl\fR will
auto-select GET, POST or HEAD based on other options, but this option
enables choices like PUT and DELETE for webdav support.

\fB::http::formatQuery\fR \fIkey value\fR ?\fIkey value\fR ...?
.
This procedure does x-url-encoding of query data.  It takes an even
number of arguments that are the keys and values of the query.  It
encodes the keys and values, and generates one string that has the
proper & and = separators.  The result is suitable for the
\fB\-query\fR value passed to \fB::http::geturl\fR.
.TP
\fB::http::quoteString\fR \fIvalue\fR
.
This procedure does x-url-encoding of string.  It takes a single argument and
encodes it.
.TP
\fB::http::reset\fR \fItoken\fR ?\fIwhy\fR?
.
This command resets the HTTP transaction identified by \fItoken\fR, if any.
This sets the \fBstate(status)\fR value to \fIwhy\fR, which defaults to
\fBreset\fR, and then calls the registered \fB\-command\fR callback.
.TP

package require tls

::http::register https 443 ::tls::socket

set token [::http::geturl https://my.secure.site/]
.CE
.RE
.TP
\fB::http::registerError\fR \fIport\fR ?\fImessage\fR?
.
This procedure allows a registered protocol handler to deliver an error
message for use by \fBhttp\fR.  Calling this command does not raise an
error. The command is useful when a registered protocol detects an problem
(for example, an invalid TLS certificate) that will cause an error to
propagate to \fBhttp\fR.  The command allows \fBhttp\fR to provide a
precise error message rather than a general one.  The command returns the
value provided by the last call with argument \fImessage\fR, or the empty
string if no such call has been made.
.TP
\fB::http::unregister\fR \fIproto\fR
.
This procedure unregisters a protocol handler that was previously
registered via \fB::http::register\fR, returning a two-item list of
the default port and handler command that was previously installed
(via \fB::http::register\fR) if there was such a handler, and an error if

Once the data associated with the URL is no longer needed, the state
array should be unset to free up storage.
The \fB::http::cleanup\fR procedure is provided for that purpose.
The following elements of
the array are supported:
.RS
.TP
\fBbinary\fR
.
This is boolean \fBtrue\fR if (after decoding any compression specified
by the
.QW "Content-Encoding"
response header) the HTTP response is binary.  It is boolean \fBfalse\fR
if the HTTP response is text.
.TP
\fBbody\fR
.
The contents of the URL.  This will be empty if the \fB\-channel\fR
option has been specified.  This value is returned by the \fB::http::data\fR command.
.TP
\fBcharset\fR
.

.
A copy of the \fBContent-Type\fR meta-data value.
.TP
\fBurl\fR
.
The requested URL.
.RE
.SH "PERSISTENT CONNECTIONS"
.PP
.SS "BASICS"
.PP
See RFC 7230 Sec 6, which supersedes RFC 2616 Sec 8.1.
.PP
A persistent connection allows multiple HTTP/1.1 transactions to be
carried over the same TCP connection.  Pipelining allows a
client to make multiple requests over a persistent connection without
waiting for each response.  The server sends responses in the same order
that the requests were received.
.PP
If a POST request fails to complete, typically user confirmation is
needed before sending the request again.  The user may wish to verify
whether the server was modified by the failed POST request, before
sending the same request again.
.PP
A HTTP request will use a persistent socket if the call to
\fBhttp::geturl\fR has the option \fB-keepalive true\fR. It will use
pipelining where permitted if the \fBhttp::config\fR option
\fB-pipeline\fR is boolean \fBtrue\fR (its default value).
.PP
The http package maintains no more than one persistent connection to each
server (i.e. each value of
.QW "domain:port" ).
If \fBhttp::geturl\fR is called to make a request over a persistent
connection while the connection is busy with another request, the new
request will be held in a queue until the connection is free.
.PP
The http package does not support HTTP/1.0 persistent connections
controlled by the \fBKeep-Alive\fR header.
.SS "SPECIAL CASES"
.PP
This subsection discusses issues related to closure of the
persistent connection by the server, automatic retry of failed requests,
the special treatment necessary for POST requests, and the options for
dealing with these cases.
.PP
In accordance with RFC 7230, \fBhttp::geturl\fR does not pipeline
requests that use the POST method.  If a POST uses a persistent
connection and is not the first request on that connection,
\fBhttp::geturl\fR waits until it has received the response for the previous
request; or (if \fBhttp::config\fR option \fB-postfresh\fR is boolean \fBtrue\fR) it
uses a new connection for each POST.
.PP
If the server is processing a number of pipelined requests, and sends a
response header
.QW "\fBConnection: close\fR"
with one of the responses (other than the last), then subsequent responses
are unfulfilled. \fBhttp::geturl\fR will send the unfulfilled requests again
over a new connection.
.PP
A difficulty arises when a HTTP client sends a request over a persistent
connection that has been idle for a while.  The HTTP server may
half-close an apparently idle connection while the client is sending a
request, but before the request arrives at the server: in this case (an
.QW "asynchronous close event" )
the request will fail.  The difficulty arises because the client cannot
be certain whether the POST modified the state of the server.  For HEAD or
GET requests, \fBhttp::geturl\fR opens another connection and retransmits
the failed request. However, if the request was a POST, RFC 7230 forbids
automatic retry by default, suggesting either user confirmation, or
confirmation by user-agent software that has semantic understanding of
the application.  The \fBhttp::config\fR option \fB-repost\fR allows for
either possibility.
.PP
Asynchronous close events can occur only in a short interval of time.  The
\fBhttp\fR package monitors each persistent connection for closure by the
server.  Upon detection, the connection is also closed at the client end,
and subsequent requests will use a fresh connection.
.PP
If the \fBhttp::geturl\fR command is called with option \fB-keepalive true\fR,
then it will both try to use an existing persistent connection
(if one is available), and it will send the server a
.QW "\fBConnection: keep-alive\fR"
request header asking to keep the connection open for future requests.
.PP
The \fBhttp::config\fR options \fB-pipeline\fR, \fB-postfresh\fR, and
\fB-repost\fR relate to persistent connections.
.PP
Option \fB-pipeline\fR, if boolean \fBtrue\fR, will pipeline GET and HEAD requests
made
over a persistent connection.  POST requests will not be pipelined - if the
POST is not the first transaction on the connection, its request will not
be sent until the previous response has finished.  GET and HEAD requests
made after a POST will not be sent until the POST response has been
delivered, and will not be sent if the POST fails.
.PP
Option \fB-postfresh\fR, if boolean \fBtrue\fR, will override the \fBhttp::geturl\fR option
\fB-keepalive\fR, and always open a fresh connection for a POST request.
.PP
Option \fB-repost\fR, if \fBtrue\fR, permits automatic retry of a POST request
that fails because it uses a persistent connection that the server has
half-closed (an
.QW "asynchronous close event" ).
Subsequent GET and HEAD requests in a failed pipeline will also be retried.
\fIThe -repost option should be used only if the application understands
that the retry is appropriate\fR - specifically, the application must know
that if the failed POST successfully modified the state of the server, a repeat POST
would have no adverse effect.
.SH EXAMPLE
.PP
This example creates a procedure to copy a URL to a file while printing a
progress meter, and prints the meta-data associated with the URL.
.PP
.CS
proc httpcopy { url file {chunk 4096} } {

.SH NAME
lreplace \- Replace elements in a list with new elements
.SH SYNOPSIS
\fBlreplace \fIlist first last \fR?\fIelement element ...\fR?
.BE
.SH DESCRIPTION
.PP
\fBlreplace\fR returns a new list formed by replacing zero or more elements of
\fIlist\fR with the \fIelement\fR arguments.
\fIfirst\fR and \fIlast\fR are index values specifying the first and
last elements of the range to replace.
The index values \fIfirst\fR and \fIlast\fR are interpreted
the same as index values for the command \fBstring index\fR,
supporting simple index arithmetic and indices relative to the
end of the list.
0 refers to the first element of the
list, and \fBend\fR refers to the last element of the list.

.PP
If either \fIfirst\fR or \fIlast\fR is less than zero, it is considered
to refer to before the first element of the list. This allows \fBlreplace\fR
to prepend elements to \fIlist\fR.
.VS TIP505
If either \fIfirst\fR or \fIlast\fR indicates a position greater than the
index of the last element of the list, it is treated as if it is an
index one greater than the last element. This allows \fBlreplace\fR to
append elements to \fIlist\fR.
.VE TIP505
.PP
If \fIlast\fR is less than \fIfirst\fR, then any specified elements
will be inserted into the list before the element specified by \fIfirst\fR
with no elements being deleted.
.PP
The \fIelement\fR arguments specify zero or more new elements to
be added to the list in place of those that were deleted.
Each \fIelement\fR argument will become a separate element of
the list.  If no \fIelement\fR arguments are specified, then the elements
between \fIfirst\fR and \fIlast\fR are simply deleted.

.SH EXAMPLES
.PP
Replacing an element of a list with another:
.PP
.CS
% \fBlreplace\fR {a b c d e} 1 1 foo
a foo c d e

.CS
proc lremove {listVariable value} {
    upvar 1 $listVariable var
    set idx [lsearch -exact $var $value]
    set var [\fBlreplace\fR $var $idx $idx]
}
.CE
.PP
.VS TIP505
Appending elements to the list; note that \fBend+2\fR will initially
be treated as if it is \fB6\fR here, but both that and \fB12345\fR are greater
than the index of the final item so they behave identically:
.PP
.CS
% set var {a b c d e}
a b c d e
% set var [\fBlreplace\fR $var 12345 end+2 f g h i]
a b c d e f g h i
.CE
.VE TIP505
.SH "SEE ALSO"
list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n),
lset(n), lrange(n), lsort(n),
string(n)
.SH KEYWORDS
element, list, replace
.\" Local variables:
.\" mode: nroff
.\" fill-column: 78
.\" End:

'\"
'\" Copyright (c) 1990-1994 The Regents of the University of California
'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
'\" Copyright (c) 1998-1999 Scriptics Corporation
'\" Copyright (c) 2000 Ajuba Solutions
'\" Contributions from Don Porter, NIST, 2002. (not subject to US copyright)
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH "tcltest" n 2.5 tcltest "Tcl Bundled Packages"
.so man.macros
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
tcltest \- Test harness support code and utilities
.SH SYNOPSIS
.nf
\fBpackage require tcltest\fR ?\fB2.5\fR?

\fBtcltest::test \fIname description\fR ?\fI\-option value ...\fR?
\fBtcltest::test \fIname description\fR ?\fIconstraints\fR? \fIbody result\fR

\fBtcltest::loadTestedCommands\fR
\fBtcltest::makeDirectory \fIname\fR ?\fIdirectory\fR?
\fBtcltest::removeDirectory \fIname\fR ?\fIdirectory\fR?

        ?\fB\-setup \fIsetupScript\fR?
        ?\fB\-body \fItestScript\fR?
        ?\fB\-cleanup \fIcleanupScript\fR?
        ?\fB\-result \fIexpectedAnswer\fR?
        ?\fB\-output \fIexpectedOutput\fR?
        ?\fB\-errorOutput \fIexpectedError\fR?
        ?\fB\-returnCodes \fIcodeList\fR?
        ?\fB\-errorCode \fIexpectedErrorCode\fR?
        ?\fB\-match \fImode\fR?
.CE
.PP
The \fIname\fR may be any string.  It is conventional to choose
a \fIname\fR according to the pattern:
.PP
.CS

a list of return codes that may be accepted from evaluation of the
\fB\-body\fR script.  If evaluation of the \fB\-body\fR script returns
a code not in the \fIexpectedCodeList\fR, the test fails.  All
return codes known to \fBreturn\fR, in both numeric and symbolic
form, including extended return codes, are acceptable elements in
the \fIexpectedCodeList\fR.  Default value is
.QW "\fBok return\fR" .
.TP
\fB\-errorCode \fIexpectedErrorCode\fR
.
The optional \fB\-errorCode\fR attribute supplies \fIexpectedErrorCode\fR,
a glob pattern that should match the error code reported from evaluation of the
\fB\-body\fR script.  If evaluation of the \fB\-body\fR script returns
a code not matching \fIexpectedErrorCode\fR, the test fails.  Default value is
.QW "\fB*\fR" .
If \fB\-returnCodes\fR does not include \fBerror\fR it is set to \fBerror\fR.
.PP
To pass, a test must successfully evaluate its \fB\-setup\fR, \fB\-body\fR,
and \fB\-cleanup\fR scripts.  The return code of the \fB\-body\fR script and
its result must match expected values, and if specified, output and error
data from the test must match expected \fB\-output\fR and \fB\-errorOutput\fR
values.  If any of these conditions are not met, then the test fails.
Note that all scripts are evaluated in the context of the caller

##############################################################################

# Public functions that are not accessible via the stubs table.

export {
    void Tcl_Main(int argc, char **argv, Tcl_AppInitProc *appInitProc)
}
export {
    void Tcl_MainEx(int argc, char **argv, Tcl_AppInitProc *appInitProc,
    Tcl_Interp *interp)
}
export {
    const char *Tcl_InitStubs(Tcl_Interp *interp, const char *version,
	int exact)
}
export {
    const char *TclTomMathInitializeStubs(Tcl_Interp* interp,
	const char* version, int epoch, int revision)

 * update the version numbers:
 *
 * library/init.tcl	(1 LOC patch)
 * unix/configure.in	(2 LOC Major, 2 LOC minor, 1 LOC patch)
 * win/configure.in	(as above)
 * win/tcl.m4		(not patchlevel)
 * README		(sections 0 and 2, with and without separator)




 * macosx/Tcl-Common.xcconfig (not patchlevel) 1 LOC
 * win/README		(not patchlevel) (sections 0 and 2)
 * unix/tcl.spec	(1 LOC patch)
 * tools/tcl.hpj.in	(not patchlevel, for windows installer)
 */

#define TCL_MAJOR_VERSION   8
#define TCL_MINOR_VERSION   6
#define TCL_RELEASE_LEVEL   TCL_FINAL_RELEASE
#define TCL_RELEASE_SERIAL  9

#define TCL_VERSION	    "8.6"
#define TCL_PATCH_LEVEL	    "8.6.9"

/*
 *----------------------------------------------------------------------------
 * The following definitions set up the proper options for Windows compilers.
 * We use this method because there is no autoconf equivalent.
 */

    }
    if (TclGetNumberFromObj(interp, objv[1], &ptr, &type) != TCL_OK) {
	return TCL_ERROR;
    }

    if (type == TCL_NUMBER_DOUBLE) {
	d = *((const double *) ptr);
	if ((d < (double)LONG_MAX) && (d > (double)LONG_MIN)) {
	    long result = (long) d;

	    Tcl_SetObjResult(interp, Tcl_NewLongObj(result));
	    return TCL_OK;
#ifndef TCL_WIDE_INT_IS_LONG
	} else if ((d < (double)LLONG_MAX) && (d > (double)LLONG_MIN)) {
	    Tcl_WideInt result = (Tcl_WideInt) d;

	    Tcl_SetObjResult(interp, Tcl_NewWideIntObj(result));
	    return TCL_OK;
#endif
	} else {
	    mp_int big;

	    if (Tcl_InitBignumFromDouble(interp, d, &big) != TCL_OK) {
		/* Infinity */
		return TCL_ERROR;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewBignumObj(&big));
	    return TCL_OK;





	}
    }

    if (type != TCL_NUMBER_NAN) {
	/*
	 * All integers are already of integer type.
	 */

	     */

	    if (data < dataend) {
		c = *data++;
	    } else if (i > 1) {
		c = '=';
	    } else {
		if (strict && i <= 1) {
		    /* single resp. unfulfilled char (each 4th next single char)
		     * is rather bad64 error case in strict mode */
		    goto bad64;
		}
		cut += 3;
		break;
	    }

	    /*
	     * Load the character into the block value. Handle ='s specially
	     * because they're only valid as the last character or two of the

		value = (value << 6) | ((c - 'a' + 26) & 0x3f);
	    } else if (c >= '0' && c <= '9') {
		value = (value << 6) | ((c - '0' + 52) & 0x3f);
	    } else if (c == '+') {
		value = (value << 6) | 0x3e;
	    } else if (c == '/') {
		value = (value << 6) | 0x3f;
	    } else if (c == '=' && (
		!strict || i > 1) /* "=" and "a=" is rather bad64 error case in strict mode */
	    ) {
		value <<= 6;
		if (i) cut++;
	    } else if (strict || !isspace(c)) {
		goto bad64;
	    } else {
		i--;
	    }
	}
	*cursor++ = UCHAR((value >> 16) & 0xff);

{
    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }
    return TCL_CONTINUE;
}


























































/*
 *-----------------------------------------------------------------------------
 *
 * TclInitEncodingCmd --
 *
 *	This function creates the 'encoding' ensemble.

    int objc,
    Tcl_Obj *const objv[])
{
    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "name ?name ...?");
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, TclJoinPath(objc - 1, objv + 1, 0));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * PathNativeNameCmd --

    if (result != TCL_OK) {
	return result;
    }

    if (first < 0) {
	first = 0;
    }
    if (first > listLen) {



	first = listLen;


    }







    if (last >= listLen) {
	last = listLen - 1;
    }
    if (first <= last) {
	numToDelete = last - first + 1;
    } else {
	numToDelete = 0;

	 * is a *major* win when splitting on a long string (especially in the
	 * megabyte range!) - DKF
	 */

	Tcl_InitHashTable(&charReuseTable, TCL_ONE_WORD_KEYS);

	for ( ; stringPtr < end; stringPtr += len) {
	    int fullchar;
	    len = TclUtfToUniChar(stringPtr, &ch);
	    fullchar = ch;

#if TCL_UTF_MAX == 4
	    if (!len) {
		len += TclUtfToUniChar(stringPtr, &ch);
		fullchar = (((fullchar & 0x3ff) << 10) | (ch & 0x3ff)) + 0x10000;

    /*
     * From now on, we only access the two objects at the end of the argument
     * array.
     */

    objv += objc-2;

    match = TclStringCmp(objv[0], objv[1], 0, nocase, reqlength);

    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(match ? 0 : 1));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *

     * Remember to keep code here in some sync with the byte-compiled versions
     * in tclExecute.c (INST_STR_EQ, INST_STR_NEQ and INST_STR_CMP as well as
     * the expr string comparison in INST_EQ/INST_NEQ/INST_LT/...).
     */

    int match, nocase, reqlength, status;

    status = TclStringCmpOpts(interp, objc, objv, &nocase, &reqlength);
    if (status != TCL_OK) {

	return status;
    }

    objv += objc-2;
    match = TclStringCmp(objv[0], objv[1], 0, nocase, reqlength);
    Tcl_SetObjResult(interp, Tcl_NewIntObj(match));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclStringCmp --
 *
 *	This is the core of Tcl's string comparison. It only handles byte
 *	arrays, UNICODE strings and UTF-8 strings correctly.
 *
 * Results:
 *	-1 if value1Ptr is less than value2Ptr, 0 if they are equal, or 1 if
 *	value1Ptr is greater.
 *
 * Side effects:
 *	May cause string representations of objects to be allocated.
 *
 *----------------------------------------------------------------------
 */

int
TclStringCmp(
    Tcl_Obj *value1Ptr,
    Tcl_Obj *value2Ptr,
    int checkEq,		/* comparison is only for equality */
    int nocase,			/* comparison is not case sensitive */
    int reqlength)		/* requested length; -1 to compare whole
				 * strings */
{
    char *s1, *s2;
    int empty, length, match, s1len, s2len;
    memCmpFn_t memCmpFn;

    if ((reqlength == 0) || (value1Ptr == value2Ptr)) {
	/*
	 * Always match at 0 chars or if it is the same obj.
	 */
	return 0;

    }

    if (!nocase && TclIsPureByteArray(value1Ptr)
	    && TclIsPureByteArray(value2Ptr)) {
	/*
	 * Use binary versions of comparisons since that won't cause undue
	 * type conversions and it is much faster. Only do this if we're
	 * case-sensitive (which is all that really makes sense with byte
	 * arrays anyway, and we have no memcasecmp() for some reason... :^)
	 */

	s1 = (char *) Tcl_GetByteArrayFromObj(value1Ptr, &s1len);
	s2 = (char *) Tcl_GetByteArrayFromObj(value2Ptr, &s2len);
	memCmpFn = memcmp;
    } else if ((value1Ptr->typePtr == &tclStringType)
	    && (value2Ptr->typePtr == &tclStringType)) {
	/*
	 * Do a unicode-specific comparison if both of the args are of String
	 * type. If the char length == byte length, we can do a memcmp. In
	 * benchmark testing this proved the most efficient check between the
	 * unicode and string comparison operations.
	 */

	if (nocase) {
	    s1 = (char *) Tcl_GetUnicodeFromObj(value1Ptr, &s1len);
	    s2 = (char *) Tcl_GetUnicodeFromObj(value2Ptr, &s2len);
	    memCmpFn = (memCmpFn_t)Tcl_UniCharNcasecmp;
	} else {
	    s1len = Tcl_GetCharLength(value1Ptr);
	    s2len = Tcl_GetCharLength(value2Ptr);
	    if ((s1len == value1Ptr->length)
		    && (value1Ptr->bytes != NULL)
		    && (s2len == value2Ptr->length)
		    && (value2Ptr->bytes != NULL)) {
		s1 = value1Ptr->bytes;
		s2 = value2Ptr->bytes;
		memCmpFn = memcmp;
	    } else {
		s1 = (char *) Tcl_GetUnicode(value1Ptr);
		s2 = (char *) Tcl_GetUnicode(value2Ptr);
		if (
#ifdef WORDS_BIGENDIAN
			1
#else
			checkEq
#endif /* WORDS_BIGENDIAN */
		        ) {
		    memCmpFn = memcmp;
		    s1len *= sizeof(Tcl_UniChar);
		    s2len *= sizeof(Tcl_UniChar);
		} else {
		    memCmpFn = (memCmpFn_t) Tcl_UniCharNcmp;
		}
	    }
	}
    } else {
	/*
	 * Get the string representations, being careful in case we have
	 * special empty string objects about.
	 */

	empty = TclCheckEmptyString(value1Ptr);
	if (empty > 0) {
	    switch (TclCheckEmptyString(value2Ptr)) {
	    case -1:
		s1 = "";
		s1len = 0;
		s2 = TclGetStringFromObj(value2Ptr, &s2len);
		break;
	    case 0:
		return -1;


	    default: /* avoid warn: `s2` may be used uninitialized */
		return 0;

	    }
	} else if (TclCheckEmptyString(value2Ptr) > 0) {
	    switch (empty) {
	    case -1:
		s2 = "";
		s2len = 0;
		s1 = TclGetStringFromObj(value1Ptr, &s1len);
		break;
	    case 0:
		return 1;


	    default: /* avoid warn: `s1` may be used uninitialized */
		return 0;

	    }
	} else {
	    s1 = TclGetStringFromObj(value1Ptr, &s1len);
	    s2 = TclGetStringFromObj(value2Ptr, &s2len);
	}

	if (!nocase && checkEq) {
	    /*
	     * When we have equal-length we can check only for (in)equality.
	     * We can use memcmp() in all (n)eq cases because we don't need to
	     * worry about lexical LE/BE variance.
	     */
	    memCmpFn = memcmp;
	} else {

	    /*
	     * As a catch-all we will work with UTF-8. We cannot use memcmp()
	     * as that is unsafe with any string containing NUL (\xC0\x80 in
	     * Tcl's utf rep). We can use the more efficient TclpUtfNcmp2 if
	     * we are case-sensitive and no specific length was requested.
	     */

	    if ((reqlength < 0) && !nocase) {
		memCmpFn = (memCmpFn_t) TclpUtfNcmp2;
	    } else {
		s1len = Tcl_NumUtfChars(s1, s1len);
		s2len = Tcl_NumUtfChars(s2, s2len);
		memCmpFn = (memCmpFn_t)
			(nocase ? Tcl_UtfNcasecmp : Tcl_UtfNcmp);
	    }
	}
    }

    length = (s1len < s2len) ? s1len : s2len;
    if (reqlength > 0 && reqlength < length) {
	length = reqlength;
    } else if (reqlength < 0) {
	/*
	 * The requested length is negative, so we ignore it by setting it to
	 * length + 1 so we correct the match var.
	 */

	reqlength = length + 1;
    }

    if (checkEq && (s1len != s2len)) {
	match = 1;		/* This will be reversed below. */
    }  else {
	/*
	 * The comparison function should compare up to the minimum byte
	 * length only.
	 */
	match = memCmpFn(s1, s2, (size_t) length);
    }
    if ((match == 0) && (reqlength > length)) {
	match = s1len - s2len;
    }
    return (match > 0) ? 1 : (match < 0) ? -1 : 0;
}




int TclStringCmpOpts(
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[],	/* Argument objects. */
    int *nocase,
    int *reqlength)

{
    int i, length;
    const char *string;

    *reqlength = -1;
    *nocase = 0;
    if (objc < 3 || objc > 6) {

				 * command. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_Token *tokenPtr, *listTokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int idx1, idx2, i;
    int emptyPrefix=1, suffixStart = 0;

    if (parsePtr->numWords < 4) {
	return TCL_ERROR;
    }
    listTokenPtr = TokenAfter(parsePtr->tokenPtr);

    tokenPtr = TokenAfter(listTokenPtr);
    if (TclGetIndexFromToken(tokenPtr, TCL_INDEX_START, TCL_INDEX_AFTER,
	    &idx1) != TCL_OK) {
	return TCL_ERROR;
    }

    tokenPtr = TokenAfter(tokenPtr);
    if (TclGetIndexFromToken(tokenPtr, TCL_INDEX_BEFORE, TCL_INDEX_END,
	    &idx2) != TCL_OK) {
	return TCL_ERROR;
    }


















    /*
     * General structure of the [lreplace] result is
     *		prefix replacement suffix
     * In a few cases we can predict various parts will be empty and
     * take advantage.
     *
     * The proper suffix begins with the greater of indices idx1 or
     * idx2 + 1. If we cannot tell at compile time which is greater,
     * we must defer to direct evaluation.
     */

    if (idx1 == TCL_INDEX_AFTER) {
	suffixStart = idx1;
    } else if (idx2 == TCL_INDEX_BEFORE) {
	suffixStart = idx1;
    } else if (idx2 == TCL_INDEX_END) {
	suffixStart = TCL_INDEX_AFTER;
    } else if (((idx2 < TCL_INDEX_END) && (idx1 <= TCL_INDEX_END))
	    || ((idx2 >= TCL_INDEX_START) && (idx1 >= TCL_INDEX_START))) {
	suffixStart = (idx1 > idx2 + 1) ? idx1 : idx2 + 1;
    } else {

	/* Make a list of them... */
	TclEmitInstInt4(	INST_LIST, i - 4,		envPtr);

	emptyPrefix = 0;
    }
     




































    if ((idx1 == suffixStart) && (parsePtr->numWords == 4)) {
	/*
	 * This is a "no-op". Example: [lreplace {a b c} 2 0]
	 * We still do a list operation to get list-verification
	 * and canonicalization side effects.
	 */
	TclEmitInstInt4(	INST_LIST_RANGE_IMM, 0,		envPtr);

#   define TclGetInt1AtPtr(p) ((int) *((signed char *) p))
#else
#   define TclGetInt1AtPtr(p) \
    (((int) *((char *) p)) | ((*(p) & 0200) ? (-256) : 0))
#endif

#define TclGetInt4AtPtr(p) \
    (((int) (TclGetUInt1AtPtr(p) << 24)) |				\
		     (*((p)+1) << 16) |				\
		     (*((p)+2) <<  8) |				\
		     (*((p)+3)))

#define TclGetUInt1AtPtr(p) \
    ((unsigned int) *(p))
#define TclGetUInt4AtPtr(p) \

      0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 192 ... 207 */
      0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 208 ... 223 */
      0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 224 ... 239 */
      0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 240 ... 255 */
    };

    Tcl_DStringInit(&lineString);
    if (Tcl_Gets(chan, &lineString) < 0) {
	return NULL;
    }
    line = Tcl_DStringValue(&lineString);

    fallback = (int) strtol(line, &line, 16);
    symbol = (int) strtol(line, &line, 10);
    numPages = (int) strtol(line, &line, 10);
    Tcl_DStringFree(&lineString);

    pageMemPtr = (unsigned short *) (dataPtr->toUnicode + 256);

    TclNewObj(objPtr);
    Tcl_IncrRefCount(objPtr);
    for (i = 0; i < numPages; i++) {
	int ch;
	const char *p;
	int expected = 3 + 16 * (16 * 4 + 1);

	if (Tcl_ReadChars(chan, objPtr, expected, 0) != expected) {
	    return NULL;
	}
	p = Tcl_GetString(objPtr);
	hi = (staticHex[UCHAR(p[0])] << 4) + staticHex[UCHAR(p[1])];
	dataPtr->toUnicode[hi] = pageMemPtr;
	p += 2;
	for (lo = 0; lo < 256; lo++) {
	    if ((lo & 0x0f) == 0) {
		p++;

}

/*
 *----------------------------------------------------------------------
 *
 * TclSpellFix --
 *
 *	Record a spelling correction that needs making in the generation of
 *	the WrongNumArgs usage message.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Can create an alternative ensemble rewrite structure.
 *
 *----------------------------------------------------------------------
 */

static int
FreeER(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Tcl_Obj **tmp = (Tcl_Obj **) data[0];
    Tcl_Obj **store = (Tcl_Obj **) data[1];

    ckfree(store);
    ckfree(tmp);
    return result;
}

void
TclSpellFix(
    Tcl_Interp *interp,

    if (iPtr->ensembleRewrite.sourceObjs == NULL) {
	iPtr->ensembleRewrite.sourceObjs = objv;
	iPtr->ensembleRewrite.numRemovedObjs = 0;
	iPtr->ensembleRewrite.numInsertedObjs = 0;
    }

    /*
     * Compute the valid length of the ensemble root.
     */

    size = iPtr->ensembleRewrite.numRemovedObjs + objc
		- iPtr->ensembleRewrite.numInsertedObjs;

    search = iPtr->ensembleRewrite.sourceObjs;
    if (search[0] == NULL) {
	/*
	 * Awful casting abuse here!
	 */

	search = (Tcl_Obj *const *) search[1];
    }

    if (badIdx < iPtr->ensembleRewrite.numInsertedObjs) {
	/*
	 * Misspelled value was inserted. We cannot directly jump to the bad
	 * value, but have to search.
	 */

	idx = 1;
	while (idx < size) {
	    if (search[idx] == bad) {
		break;
	    }
	    idx++;
	}
	if (idx == size) {
	    return;
	}
    } else {
	/*
	 * Jump to the misspelled value.
	 */

	idx = iPtr->ensembleRewrite.numRemovedObjs + badIdx
		- iPtr->ensembleRewrite.numInsertedObjs;

	/* Verify */
	if (search[idx] != bad) {
	    Tcl_Panic("SpellFix: programming error");
	}
    }

    search = iPtr->ensembleRewrite.sourceObjs;
    if (search[0] == NULL) {
	store = (Tcl_Obj **) search[2];
    }  else {
	Tcl_Obj **tmp = ckalloc(3 * sizeof(Tcl_Obj *));

	store = ckalloc(size * sizeof(Tcl_Obj *));
	memcpy(store, iPtr->ensembleRewrite.sourceObjs,
		size * sizeof(Tcl_Obj *));

	/*
	 * Awful casting abuse here! Note that the NULL in the first element
	 * indicates that the initial objects are a raw array in the second
	 * element and the rewritten ones are a raw array in the third.
	 */

	tmp[0] = NULL;
	tmp[1] = (Tcl_Obj *) iPtr->ensembleRewrite.sourceObjs;
	tmp[2] = (Tcl_Obj *) store;
	iPtr->ensembleRewrite.sourceObjs = (Tcl_Obj *const *) tmp;

	TclNRAddCallback(interp, FreeER, tmp, store, NULL, NULL);

    }

    store[idx] = fix;
    Tcl_IncrRefCount(fix);
    TclNRAddCallback(interp, TclNRReleaseValues, fix, NULL, NULL, NULL);
}


 *
 * Side effects:
 *	Almost certainly, depending on the ByteCode's instructions.
 *
 *----------------------------------------------------------------------
 */
#define	bcFramePtr	(&TD->cmdFrame)
#define	initCatchTop	((ptrdiff_t *) (TD->stack-1))
#define	initTosPtr	((Tcl_Obj **) (initCatchTop+codePtr->maxExceptDepth))
#define esPtr		(iPtr->execEnvPtr->execStackPtr)

int
TclNRExecuteByteCode(
    Tcl_Interp *interp,		/* Token for command interpreter. */
    ByteCode *codePtr)		/* The bytecode sequence to interpret. */

	if (*(pc+9) == INST_POP) {
	    NEXT_INST_F(10, 1, 0);
	}
#endif

	/* Every range of an empty list is an empty list */
	if (objc == 0) {
	    /* avoid return of not canonical list (e. g. spaces in string repr.) */
	    if (ListObjIsCanonical(valuePtr)) {
		TRACE_APPEND(("\n"));
		NEXT_INST_F(9, 0, 0);
	    }
	    goto emptyList;
	}

	/* Decode index value operands. */

	/* 
	assert ( toIdx != TCL_INDEX_AFTER);
	 *

	source = FileBasename(interp, objv[i]);
	if (source == NULL) {
	    result = TCL_ERROR;
	    break;
	}
	jargv[0] = objv[objc - 1];
	jargv[1] = source;
	newFileName = TclJoinPath(2, jargv, 1);
	Tcl_IncrRefCount(newFileName);
	result = CopyRenameOneFile(interp, objv[i], newFileName, copyFlag,
		force);
	Tcl_DecrRefCount(newFileName);
	Tcl_DecrRefCount(source);

	if (result == TCL_ERROR) {

Tcl_Obj *
Tcl_FSJoinToPath(
    Tcl_Obj *pathPtr,		/* Valid path or NULL. */
    int objc,			/* Number of array elements to join */
    Tcl_Obj *const objv[])	/* Path elements to join. */
{
    if (pathPtr == NULL) {
	return TclJoinPath(objc, objv, 0);
    }
    if (objc == 0) {
	return TclJoinPath(1, &pathPtr, 0);
    }
    if (objc == 1) {
	Tcl_Obj *pair[2];

	pair[0] = pathPtr;
	pair[1] = objv[0];
	return TclJoinPath(2, pair, 0);
    } else {
	int elemc = objc + 1;
	Tcl_Obj *ret, **elemv = ckalloc(elemc*sizeof(Tcl_Obj *));

	elemv[0] = pathPtr;
	memcpy(elemv+1, objv, objc*sizeof(Tcl_Obj *));
	ret = TclJoinPath(elemc, elemv, 0);
	ckfree(elemv);
	return ret;
    }
}

/*
 *---------------------------------------------------------------------------

Tcl_FSLstatProc			TclpObjLstat;
Tcl_FSCopyFileProc		TclpObjCopyFile;
Tcl_FSDeleteFileProc		TclpObjDeleteFile;
Tcl_FSRenameFileProc		TclpObjRenameFile;
Tcl_FSCreateDirectoryProc	TclpObjCreateDirectory;
Tcl_FSCopyDirectoryProc		TclpObjCopyDirectory;
Tcl_FSRemoveDirectoryProc	TclpObjRemoveDirectory;

Tcl_FSLinkProc			TclpObjLink;
Tcl_FSListVolumesProc		TclpObjListVolumes;

/*
 * Define the native filesystem dispatch table. If necessary, it is ok to make
 * this non-static, but it should only be accessed by the functions actually
 * listed within it (or perhaps other helper functions of them). Anything

 *     unlink. The env variable TCL_TEMPLOAD_NO_UNLINK allows detection of a
 *     users general request (unlink and not.
 *
 * By default the unlink is done (if not in AUFS). However if the variable is
 * present and set to true (any integer > 0) then the unlink is skipped.
 */

static int
skipUnlink (Tcl_Obj* shlibFile)
{
    /* Order of testing:
     * 1. On hpux we generally want to skip unlink in general
     *
     * Outside of hpux then:
     * 2. For a general user request   (TCL_TEMPLOAD_NO_UNLINK present, non-empty, => int)
     * 3. For general AUFS environment (statfs, if available).

    /*
     * Try to delete the file immediately - this is possible in some OSes, and
     * avoids any worries about leaving the copy laying around on exit.
     */

    if (
	!skipUnlink (copyToPtr) &&
	(Tcl_FSDeleteFile(copyToPtr) == TCL_OK)) {
	Tcl_DecrRefCount(copyToPtr);

	/*
	 * We tell our caller about the real shared library which was loaded.
	 * Note that this does mean that the package list maintained by 'load'
	 * will store the original (vfs) path alongside the temporary load

	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "cannot unload: filesystem does not support unloading",
		    -1));
	}
	return TCL_ERROR;
    }





















    if (handle->unloadFileProcPtr != NULL) {
	handle->unloadFileProcPtr(handle);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFSUnloadTempFile --
 *

MODULE_SCOPE char *	TclDStringAppendObj(Tcl_DString *dsPtr,
			    Tcl_Obj *objPtr);
MODULE_SCOPE char *	TclDStringAppendDString(Tcl_DString *dsPtr,
			    Tcl_DString *toAppendPtr);
MODULE_SCOPE Tcl_Obj *	TclDStringToObj(Tcl_DString *dsPtr);
MODULE_SCOPE Tcl_Obj *const *	TclFetchEnsembleRoot(Tcl_Interp *interp,
			    Tcl_Obj *const *objv, int objc, int *objcPtr);
MODULE_SCOPE Tcl_Namespace * 	TclEnsureNamespace(
			    Tcl_Interp *interp,
			    Tcl_Namespace *namespacePtr);

MODULE_SCOPE void	TclFinalizeAllocSubsystem(void);
MODULE_SCOPE void	TclFinalizeAsync(void);
MODULE_SCOPE void	TclFinalizeDoubleConversion(void);
MODULE_SCOPE void	TclFinalizeEncodingSubsystem(void);

MODULE_SCOPE void	TclInitNamespaceSubsystem(void);
MODULE_SCOPE void	TclInitNotifier(void);
MODULE_SCOPE void	TclInitObjSubsystem(void);
MODULE_SCOPE void	TclInitSubsystems(void);
MODULE_SCOPE int	TclInterpReady(Tcl_Interp *interp);
MODULE_SCOPE int	TclIsSpaceProc(char byte);
MODULE_SCOPE int	TclIsBareword(char byte);
MODULE_SCOPE Tcl_Obj *	TclJoinPath(int elements, Tcl_Obj * const objv[],
			    int forceRelative);
MODULE_SCOPE int	TclJoinThread(Tcl_ThreadId id, int *result);
MODULE_SCOPE void	TclLimitRemoveAllHandlers(Tcl_Interp *interp);
MODULE_SCOPE Tcl_Obj *	TclLindexList(Tcl_Interp *interp,
			    Tcl_Obj *listPtr, Tcl_Obj *argPtr);
MODULE_SCOPE Tcl_Obj *	TclLindexFlat(Tcl_Interp *interp, Tcl_Obj *listPtr,
			    int indexCount, Tcl_Obj *const indexArray[]);
/* TIP #280 */

    }
    bytesNeeded += numElems;

    /*
     * Pass 2: copy into string rep buffer.
     */

    /*
     * We used to set the string length here, relying on a presumed
     * guarantee that the number of bytes TclScanElement() calls reported
     * to be needed was a precise count and not an over-estimate, so long
     * as the same flag values were passed to TclConvertElement().
     *
     * Then we saw [35a8f1c04a], where a bug in TclScanElement() caused
     * that guarantee to fail. Rather than trust there are no more bugs,
     * we set the length after the loop based on what was actually written,
     * an not on what was predicted.
     *
    listPtr->length = bytesNeeded - 1;
     *
     */

    listPtr->bytes = ckalloc(bytesNeeded);
    dst = listPtr->bytes;
    for (i = 0; i < numElems; i++) {
	flagPtr[i] |= (i ? TCL_DONT_QUOTE_HASH : 0);
	elem = TclGetStringFromObj(elemPtrs[i], &length);
	dst += TclConvertElement(elem, length, dst, flagPtr[i]);
	*dst++ = ' ';
    }
    dst[-1] = '\0';

    /* Here is the safe setting of the string length. */
    listPtr->length = dst - 1 - listPtr->bytes;

    if (flagPtr != localFlags) {
	ckfree(flagPtr);
    }
}

/*

#define ALLOC_CHUNK 8

/*
 * Function declarations for things defined in this file.
 */


static Object *		AllocObject(Tcl_Interp *interp, const char *nameStr,
			    Namespace *nsPtr, const char *nsNameStr);
static int		CloneClassMethod(Tcl_Interp *interp, Class *clsPtr,
			    Method *mPtr, Tcl_Obj *namePtr,
			    Method **newMPtrPtr);
static int		CloneObjectMethod(Tcl_Interp *interp, Object *oPtr,
			    Method *mPtr, Tcl_Obj *namePtr);

static void		KillFoundation(ClientData clientData,
			    Tcl_Interp *interp);
static void		MyDeleted(ClientData clientData);
static void		ObjectNamespaceDeleted(ClientData clientData);
static void		ObjectRenamedTrace(ClientData clientData,
			    Tcl_Interp *interp, const char *oldName,
			    const char *newName, int flags);


static inline void	SquelchCachedName(Object *oPtr);

static int		PublicObjectCmd(ClientData clientData,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const *objv);
static int		PublicNRObjectCmd(ClientData clientData,
			    Tcl_Interp *interp, int objc,

    /*
     * Create the objects at the core of the object system. These need to be
     * spliced manually.
     */

    /* Stand up a phony class for bootstrapping. */
    fPtr->objectCls = &fakeCls;
    /* referenced in TclOOAllocClass to increment the refCount. */
    fakeCls.thisPtr = &fakeObject;

    fPtr->objectCls = TclOOAllocClass(interp,
	    AllocObject(interp, "object", (Namespace *)fPtr->ooNs, NULL));
    /* Corresponding TclOODecrRefCount in KillFoudation */
    AddRef(fPtr->objectCls->thisPtr);

    /* This is why it is unnecessary in this routine to replace the
     * incremented reference count of fPtr->objectCls that was swallowed by
     * fakeObject. */
    fPtr->objectCls->superclasses.num = 0;
    ckfree(fPtr->objectCls->superclasses.list);
    fPtr->objectCls->superclasses.list = NULL;

    /* special initialization for the primordial objects */
    fPtr->objectCls->thisPtr->flags |= ROOT_OBJECT;
    fPtr->objectCls->flags |= ROOT_OBJECT;

    fPtr->classCls = TclOOAllocClass(interp,
	    AllocObject(interp, "class", (Namespace *)fPtr->ooNs, NULL));
    /* Corresponding TclOODecrRefCount in KillFoudation */
    AddRef(fPtr->classCls->thisPtr);

    /*
     * Increment reference counts for each reference because these
     * relationships can be dynamically changed.

    TclOODecrRefCount(oPtr);
    return;
}

/*
 * ----------------------------------------------------------------------
 *
 * TclOODeleteDescendants --
 *
 *	Delete all descendants of a particular class.
 *
 * ----------------------------------------------------------------------
 */

void
TclOODeleteDescendants(
    Tcl_Interp *interp,		/* The interpreter containing the class. */
    Object *oPtr)		/* The object representing the class. */
{
    Class *clsPtr = oPtr->classPtr, *subclassPtr, *mixinSubclassPtr;
    Object *instancePtr;

    /*
     * Squelch classes that this class has been mixed into.
     */

    if (clsPtr->mixinSubs.num > 0) {
	while (clsPtr->mixinSubs.num > 0) {
	    mixinSubclassPtr = clsPtr->mixinSubs.list[clsPtr->mixinSubs.num-1];
	    /* This condition also covers the case where mixinSubclassPtr ==
	     * clsPtr
	     */
	    if (!Deleted(mixinSubclassPtr->thisPtr)
		    && !(mixinSubclassPtr->thisPtr->flags & DONT_DELETE)) {
		Tcl_DeleteCommandFromToken(interp,
			mixinSubclassPtr->thisPtr->command);
	    }
	    TclOORemoveFromMixinSubs(mixinSubclassPtr, clsPtr);
	}
    }
    if (clsPtr->mixinSubs.size > 0) {
	ckfree(clsPtr->mixinSubs.list);
	clsPtr->mixinSubs.size = 0;
    }
    /*
     * Squelch subclasses of this class.
     */

    if (clsPtr->subclasses.num > 0) {
	while (clsPtr->subclasses.num > 0) {
	    subclassPtr = clsPtr->subclasses.list[clsPtr->subclasses.num-1];
	    if (!Deleted(subclassPtr->thisPtr) && !IsRoot(subclassPtr)
		    && !(subclassPtr->thisPtr->flags & DONT_DELETE)) {
		Tcl_DeleteCommandFromToken(interp,
			subclassPtr->thisPtr->command);
	    }
	    TclOORemoveFromSubclasses(subclassPtr, clsPtr);
	}
    }
    if (clsPtr->subclasses.size > 0) {
	ckfree(clsPtr->subclasses.list);
	clsPtr->subclasses.list = NULL;
	clsPtr->subclasses.size = 0;
    }

    /*
     * Squelch instances of this class (includes objects we're mixed into).
     */

    if (clsPtr->instances.num > 0) {
	while (clsPtr->instances.num > 0) {
	    instancePtr = clsPtr->instances.list[clsPtr->instances.num-1];
	    /* This condition also covers the case where instancePtr == oPtr */
	    if (!Deleted(instancePtr) && !IsRoot(instancePtr) &&
		    !(instancePtr->flags & DONT_DELETE)) {
		Tcl_DeleteCommandFromToken(interp, instancePtr->command);
	    }
	    TclOORemoveFromInstances(instancePtr, clsPtr);
	}
    }
    if (clsPtr->instances.size > 0) {
	ckfree(clsPtr->instances.list);
	clsPtr->instances.list = NULL;
	clsPtr->instances.size = 0;
    }
}
	

/*
 * ----------------------------------------------------------------------
 *
 * TclOOReleaseClassContents --
 *
 *	Tear down the special class data structure, including deleting all
 *	dependent classes and objects.
 *
 * ----------------------------------------------------------------------
 */

void
TclOOReleaseClassContents(
    Tcl_Interp *interp,		/* The interpreter containing the class. */
    Object *oPtr)		/* The object representing the class. */
{
    FOREACH_HASH_DECLS;
    int i; 
    Class *clsPtr = oPtr->classPtr, *tmpClsPtr;
    Method *mPtr;

    if (!Deleted(oPtr)) {
	if (IsRootClass(oPtr)) {
	    Tcl_Panic("deleting class structure for non-deleted %s",
		    "::oo::class");
	} else if (IsRootObject(oPtr)) {
	    Tcl_Panic("deleting class structure for non-deleted %s",
		    "::oo::object");



	}
    }

    /*
     * Squelch method implementation chain caches.
     */

     * process of being deleted, nothing else may modify its bookeeping
     * records.  This is the flag that
     */
    oPtr->flags |= OBJECT_DELETED;

    /* Let the dominoes fall */
    if (oPtr->classPtr) {
	TclOODeleteDescendants(interp, oPtr);
    }

    /*
     * We do not run destructors on the core class objects when the
     * interpreter is being deleted; their incestuous nature causes problems
     * in that case when the destructor is partially deleted before the uses
     * of it have gone. [Bug 2949397]

    TclOORemoveFromInstances(oPtr, oPtr->selfCls);

    if (oPtr->mixins.num > 0) {
	FOREACH(mixinPtr, oPtr->mixins) {
	    TclOORemoveFromInstances(oPtr, mixinPtr);
	    TclOODecrRefCount(mixinPtr->thisPtr);
	}
	if (oPtr->mixins.list != NULL) {
	    ckfree(oPtr->mixins.list);
	}
    }

    FOREACH(filterObj, oPtr->filters) {
	TclDecrRefCount(filterObj);
    }
    if (i) {
	ckfree(oPtr->filters.list);

	}
	Tcl_DeleteHashTable(oPtr->metadataPtr);
	ckfree(oPtr->metadataPtr);
	oPtr->metadataPtr = NULL;
    }

    /*
     * Because an object can be a class that is an instance of itself, the
     * class object's class structure should only be cleaned after most of
     * the cleanup on the object is done. 

     *


     * The class of objects needs some special care; if it is deleted (and
     * we're not killing the whole interpreter) we force the delete of the
     * class of classes now as well. Due to the incestuous nature of those two
     * classes, if one goes the other must too and yet the tangle can
     * sometimes not go away automatically; we force it here. [Bug 2962664]
     */

    if (IsRootObject(oPtr) && !Deleted(fPtr->classCls->thisPtr)
	    && !Tcl_InterpDeleted(interp)) {

	Tcl_DeleteCommandFromToken(interp, fPtr->classCls->thisPtr->command);
    }

    if (oPtr->classPtr != NULL) {
	TclOOReleaseClassContents(interp, oPtr);
    }

    /*
     * Delete the object structure itself.
     */

    TclNsDecrRefCount((Namespace *)oPtr->namespacePtr);

    clsPtr->instances.list[clsPtr->instances.num++] = oPtr;
    AddRef(oPtr);
}

/*
 * ----------------------------------------------------------------------
 *
 * TclOORemoveFromMixins --
 *
 *	Utility function to remove a class from the list of mixins within an
 *	object.
 *
 * ----------------------------------------------------------------------
 */

int
TclOORemoveFromMixins(
    Class *mixinPtr,		/* The mixin to remove. */
    Object *oPtr)		/* The object (possibly) containing the
				 * reference to the mixin. */
{
    int i, res = 0;
    Class *mixPtr;

    FOREACH(mixPtr, oPtr->mixins) {
	if (mixinPtr == mixPtr) {
	    RemoveItem(Class, oPtr->mixins, i);
	    TclOODecrRefCount(mixPtr->thisPtr);
	    res++;
	    break;
	}
    }
    if (oPtr->mixins.num == 0) {
	ckfree(oPtr->mixins.list);
	oPtr->mixins.list = NULL;
    }
    return res;
}

/*
 * ----------------------------------------------------------------------
 *
 * TclOORemoveFromSubclasses --
 *
 *	Utility function to remove a class from the list of subclasses within
 *	another class. Returns the number of removals performed.
 *
 * ----------------------------------------------------------------------
 */

	return;
    }
    if (superPtr->subclasses.num >= superPtr->subclasses.size) {
	superPtr->subclasses.size += ALLOC_CHUNK;
	if (superPtr->subclasses.size == ALLOC_CHUNK) {
	    superPtr->subclasses.list = ckalloc(sizeof(Class *) * ALLOC_CHUNK);
	} else {
	    superPtr->subclasses.list = ckrealloc(superPtr->subclasses.list,
		    sizeof(Class *) * superPtr->subclasses.size);
	}
    }
    superPtr->subclasses.list[superPtr->subclasses.num++] = subPtr;
    AddRef(subPtr->thisPtr);
}

/*

    superPtr->mixinSubs.list[superPtr->mixinSubs.num++] = subPtr;
    AddRef(subPtr->thisPtr);
}

/*
 * ----------------------------------------------------------------------
 *
 * TclOOAllocClass --
 *
 *	Allocate a basic class. Does not add class to its class's instance
 *	list.
 *
 * ----------------------------------------------------------------------
 */

Class *
TclOOAllocClass(
    Tcl_Interp *interp,		/* Interpreter within which to allocate the
				 * class. */
    Object *useThisObj)		/* Object that is to act as the class
				 * representation. */
{
    Foundation *fPtr = GetFoundation(interp);
    Class *clsPtr = ckalloc(sizeof(Class));

    /*
     * Check to see if we're really creating a class. If so, allocate the
     * class structure as well.
     */

    if (TclOOIsReachable(fPtr->classCls, classPtr)) {
	/*
	 * Is a class, so attach a class structure. Note that the
	 * TclOOAllocClass function splices the structure into the object, so
	 * we don't have to. Once that's done, we need to repatch the object
	 * to have the right class since TclOOAllocClass interferes with that.
	 */

	TclOOAllocClass(interp, oPtr);
	TclOOAddToSubclasses(oPtr->classPtr, fPtr->objectCls);
    } else {
	oPtr->classPtr = NULL;
    }
    return oPtr;
}


	AddSimpleClassChainToCallContext(superPtr, methodNameObj, cbPtr,
		doneFilters, flags|TRAVERSED_MIXIN, filterDecl);
    }

    if (flags & CONSTRUCTOR) {
	AddMethodToCallChain(classPtr->constructorPtr, cbPtr, doneFilters,
		filterDecl, flags);

    } else if (flags & DESTRUCTOR) {
	AddMethodToCallChain(classPtr->destructorPtr, cbPtr, doneFilters,
		filterDecl, flags);
    } else {
	Tcl_HashEntry *hPtr = Tcl_FindHashEntry(&classPtr->classMethods,
		(char *) methodNameObj);

    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const *objv)
{
    Object *oPtr;
    Class *clsPtr;
    Foundation *fPtr = TclOOGetFoundation(interp);
    int wasClass, willBeClass;

    /*
     * Parse the context to get the object to operate on.
     */

    oPtr = (Object *) TclOOGetDefineCmdContext(interp);
    if (oPtr == NULL) {

	return TCL_ERROR;
    }
    clsPtr = GetClassInOuterContext(interp, objv[1],
	    "the class of an object must be a class");
    if (clsPtr == NULL) {
	return TCL_ERROR;
    }
    if (oPtr == clsPtr->thisPtr) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"may not change classes into an instance of themselves", -1));
	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
	return TCL_ERROR;
    }

    /*
     * Set the object's class.
     */

    wasClass = (oPtr->classPtr != NULL);
    willBeClass = (TclOOIsReachable(fPtr->classCls, clsPtr));

    if (oPtr->selfCls != clsPtr) {
	TclOORemoveFromInstances(oPtr, oPtr->selfCls);
	TclOODecrRefCount(oPtr->selfCls->thisPtr);
	oPtr->selfCls = clsPtr;
	AddRef(oPtr->selfCls->thisPtr);
	TclOOAddToInstances(oPtr, oPtr->selfCls);

	/*
	 * Create or delete the class guts if necessary.
	 */

	if (wasClass && !willBeClass) {
	    /*
	     * This is the most global of all epochs. Bump it! No cache can be
	     * trusted!
	     */

	    TclOORemoveFromMixins(oPtr->classPtr, oPtr);
	    oPtr->fPtr->epoch++;
	    oPtr->flags |= DONT_DELETE;
	    TclOODeleteDescendants(interp, oPtr);
	    oPtr->flags &= ~DONT_DELETE;
	    TclOOReleaseClassContents(interp, oPtr);
		ckfree(oPtr->classPtr);
		oPtr->classPtr = NULL;
	} else if (!wasClass && willBeClass) {
	    TclOOAllocClass(interp, oPtr);
	}

	if (oPtr->classPtr != NULL) {
	    BumpGlobalEpoch(interp, oPtr->classPtr);
	} else {
	    oPtr->epoch++;
	}
    }

	if (TclOONewProcMethod(interp, oPtr->classPtr, isPublic, objv[1],
		objv[2], objv[3], NULL) == NULL) {
	    return TCL_ERROR;
	}
    }
    return TCL_OK;
}
































































/*
 * ----------------------------------------------------------------------
 *
 * TclOODefineRenameMethodObjCmd --
 *	Implementation of the "renamemethod" subcommand of the "oo::define"
 *	and "oo::objdefine" commands.

    TclMakeEnsemble(interp, "::oo::InfoClass", infoClassCmds);

    /*
     * Install into the master [info] ensemble.
     */

    infoCmd = Tcl_FindCommand(interp, "info", NULL, TCL_GLOBAL_ONLY);
    if (infoCmd) {
	Tcl_GetEnsembleMappingDict(NULL, infoCmd, &mapDict);
	Tcl_DictObjPut(NULL, mapDict, Tcl_NewStringObj("object", -1),
		Tcl_NewStringObj("::oo::InfoObject", -1));
	Tcl_DictObjPut(NULL, mapDict, Tcl_NewStringObj("class", -1),
		Tcl_NewStringObj("::oo::InfoClass", -1));
	Tcl_SetEnsembleMappingDict(interp, infoCmd, mapDict);
    }
}

/*
 * ----------------------------------------------------------------------
 *
 * GetClassFromObj --
 *

				 * no methods, mixins, or filters. */
#define ROOT_CLASS 0x8000	/* Flag to say that this object is the root
				 * class of classes, and should be treated
				 * specially during teardown (and in a few
				 * other spots). */
#define FORCE_UNKNOWN 0x10000	/* States that we are *really* looking up the
				 * unknown method handler at that point. */
#define DONT_DELETE 0x20000	/* Inhibit deletion of this object. */

/*
 * And the definition of a class. Note that every class also has an associated
 * object, through which it is manipulated.
 */

typedef struct Class {

 * Private definitions, some of which perhaps ought to be exposed properly or
 * maybe just put in the internal stubs table.
 */

MODULE_SCOPE void	TclOOAddToInstances(Object *oPtr, Class *clsPtr);
MODULE_SCOPE void	TclOOAddToMixinSubs(Class *subPtr, Class *mixinPtr);
MODULE_SCOPE void	TclOOAddToSubclasses(Class *subPtr, Class *superPtr);
MODULE_SCOPE Class *	TclOOAllocClass(Tcl_Interp *interp,
			    Object *useThisObj);
MODULE_SCOPE int	TclNRNewObjectInstance(Tcl_Interp *interp,
			    Tcl_Class cls, const char *nameStr,
			    const char *nsNameStr, int objc,
			    Tcl_Obj *const *objv, int skip,
			    Tcl_Object *objectPtr);
MODULE_SCOPE Object *	TclNewObjectInstanceCommon(Tcl_Interp *interp,
			    Class *classPtr,
			    const char *nameStr,
			    const char *nsNameStr);
MODULE_SCOPE int	TclOODecrRefCount(Object *oPtr);
MODULE_SCOPE int	TclOODefineSlots(Foundation *fPtr);
MODULE_SCOPE void	TclOODeleteChain(CallChain *callPtr);
MODULE_SCOPE void	TclOODeleteChainCache(Tcl_HashTable *tablePtr);
MODULE_SCOPE void	TclOODeleteContext(CallContext *contextPtr);
MODULE_SCOPE void	TclOODeleteDescendants(Tcl_Interp *interp,
			    Object *oPtr);
MODULE_SCOPE void	TclOODelMethodRef(Method *method);
MODULE_SCOPE CallContext *TclOOGetCallContext(Object *oPtr,
			    Tcl_Obj *methodNameObj, int flags,
			    Tcl_Obj *cacheInThisObj);
MODULE_SCOPE CallChain *TclOOGetStereotypeCallChain(Class *clsPtr,
			    Tcl_Obj *methodNameObj, int flags);
MODULE_SCOPE Foundation	*TclOOGetFoundation(Tcl_Interp *interp);

			    Tcl_Obj *const objv[]);
MODULE_SCOPE int	TclNRObjectContextInvokeNext(Tcl_Interp *interp,
			    Tcl_ObjectContext context, int objc,
			    Tcl_Obj *const *objv, int skip);
MODULE_SCOPE void	TclOONewBasicMethod(Tcl_Interp *interp, Class *clsPtr,
			    const DeclaredClassMethod *dcm);
MODULE_SCOPE Tcl_Obj *	TclOOObjectName(Tcl_Interp *interp, Object *oPtr);
MODULE_SCOPE void	TclOOReleaseClassContents(Tcl_Interp *interp,
			    Object *oPtr);
MODULE_SCOPE int	TclOORemoveFromInstances(Object *oPtr, Class *clsPtr);
MODULE_SCOPE int	TclOORemoveFromMixins(Class *mixinPtr, Object *oPtr);
MODULE_SCOPE int	TclOORemoveFromMixinSubs(Class *subPtr,
			    Class *mixinPtr);
MODULE_SCOPE int	TclOORemoveFromSubclasses(Class *subPtr,
			    Class *superPtr);
MODULE_SCOPE Tcl_Obj *	TclOORenderCallChain(Tcl_Interp *interp,
			    CallChain *callPtr);
MODULE_SCOPE void	TclOOStashContext(Tcl_Obj *objPtr,

    *varPtr = rPtr->fetchProc(interp, rPtr);

    /*
     * Must not retain reference to resolved information. [Bug 3105999]
     */


    rPtr->deleteProc(rPtr);

    return (*varPtr ? TCL_OK : TCL_CONTINUE);
}

static Tcl_Var
ProcedureMethodCompiledVarConnect(
    Tcl_Interp *interp,
    Tcl_ResolvedVarInfo *rPtr)
{

Tcl_Obj *
Tcl_FSJoinPath(
    Tcl_Obj *listObj,		/* Path elements to join, may have a zero
				 * reference count. */
    int elements)		/* Number of elements to use (-1 = all) */
{
    Tcl_Obj *res;
    int objc;
    Tcl_Obj **objv;

    if (Tcl_ListObjLength(NULL, listObj, &objc) != TCL_OK) {
	return NULL;
    }

    elements = ((elements >= 0) && (elements <= objc)) ? elements : objc;

    Tcl_ListObjGetElements(NULL, listObj, &objc, &objv);
    res = TclJoinPath(elements, objv, 0);

    return res;
}

Tcl_Obj *
TclJoinPath(
    int elements,		/* Number of elements to use (-1 = all) */
    Tcl_Obj * const objv[],	/* Path elements to join */
    int forceRelative)		/* If non-zero, assume all more paths are
				 * relative (e. g. simple normalization) */
{
    Tcl_Obj *res = NULL;
    int i;
    const Tcl_Filesystem *fsPtr = NULL;

    assert ( elements >= 0 );

	 *
	 * Bugfix [a47641a0]. TclNewFSPathObj requires first argument
	 * to be an absolute path. Added a check for that elt is absolute.
	 */

	if ((elt->typePtr == &tclFsPathType)
		&& !((elt->bytes != NULL) && (elt->bytes[0] == '\0'))
		&& TclGetPathType(elt, NULL, NULL, NULL) == TCL_PATH_ABSOLUTE) {
	    Tcl_Obj *tailObj = objv[1];
	    Tcl_PathType type;

	    /* if forceRelative - second path is relative */
	    type = forceRelative ? TCL_PATH_RELATIVE :
		    TclGetPathType(tailObj, NULL, NULL, NULL);
	    if (type == TCL_PATH_RELATIVE) {
		const char *str;
		int len;

		str = Tcl_GetStringFromObj(tailObj, &len);
		if (len == 0) {
		    /*

	Tcl_PathType type;
	char *strElt, *ptr;
	Tcl_Obj *driveName = NULL;
	Tcl_Obj *elt = objv[i];

	strElt = Tcl_GetStringFromObj(elt, &strEltLen);
	driveNameLength = 0;
	/* if forceRelative - all paths excepting first one are relative */
	type = (forceRelative && (i > 0)) ? TCL_PATH_RELATIVE :
		TclGetPathType(elt, &fsPtr, &driveNameLength, &driveName);
	if (type != TCL_PATH_RELATIVE) {
	    /*
	     * Zero out the current result.
	     */

	    if (res != NULL) {
		TclDecrRefCount(res);

		    len = 0;
		}
		break;
	    default:
		count = 0;
		state = 1;
	    }
	    break;
	case 1:		/* Scanning for next dirsep */
	    switch (*p) {
	    case '/':
	    case '\\':
	    case ':':
		state = 0;
		break;

    name = Tcl_GetStringFromObj(pathPtr, &len);

    /*
     * Handle tilde substitutions, if needed.
     */

    if (len && name[0] == '~') {
	Tcl_DString temp;
	int split;
	char separator = '/';



	/*
	 * We have multiple cases '~/foo/bar...', '~user/foo/bar...', etc.
	 * split becomes value 1 for '~/...' as well as for '~'.
	 */
	split = FindSplitPos(name, separator);



	/*
	 * Do some tilde substitution.
	 */

	if (split == 1) {
	    /*
	     * We have just '~' (or '~/...')
	     */

	    const char *dir;
	    Tcl_DString dirString;





	    dir = TclGetEnv("HOME", &dirString);
	    if (dir == NULL) {
		if (interp) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "couldn't find HOME environment variable to"
			    " expand path", -1));
		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH",
			    "HOMELESS", NULL);
		}
		return TCL_ERROR;
	    }
	    Tcl_DStringInit(&temp);
	    Tcl_JoinPath(1, &dir, &temp);
	    Tcl_DStringFree(&dirString);
	} else {
	    /*
	     * We have a user name '~user'
	     */

	    const char *expandedUser;
	    Tcl_DString userName;

	    Tcl_DStringInit(&userName);
	    Tcl_DStringAppend(&userName, name+1, split-1);
	    expandedUser = Tcl_DStringValue(&userName);

	    Tcl_DStringInit(&temp);
	    if (TclpGetUserHome(expandedUser, &temp) == NULL) {
		if (interp != NULL) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "user \"%s\" doesn't exist", expandedUser));
		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH", "NOUSER",
			    NULL);
		}
		Tcl_DStringFree(&userName);
		Tcl_DStringFree(&temp);



		return TCL_ERROR;
	    }

	    Tcl_DStringFree(&userName);

	}

	transPtr = TclDStringToObj(&temp);

	if (split != len) {
	    /*
	     * Join up the tilde substitution with the rest.

		}
		TclDecrRefCount(parts);
	    } else {
		Tcl_Obj *pair[2];

		pair[0] = transPtr;
		pair[1] = Tcl_NewStringObj(name+split+1, -1);
		transPtr = TclJoinPath(2, pair, 1);
		if (transPtr != pair[0]) {
		    Tcl_DecrRefCount(pair[0]);
		}
		if (transPtr != pair[1]) {
		    Tcl_DecrRefCount(pair[1]);
		}
	    }
	}
    } else {
	transPtr = TclJoinPath(1, &pathPtr, 1);
    }

    /*
     * Now we have a translated filename in 'transPtr'. This will have forward
     * slashes on Windows, and will not contain any ~user sequences.
     */

	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "argument with no name", -1));
	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "PROC",
		    "FORMALARGUMENTFORMAT", NULL);
	    goto procError;
	}

	argname = Tcl_GetStringFromObj(fieldValues[0], &plen);
	nameLength = Tcl_NumUtfChars(argname, plen);
	if (fieldCount == 2) {
	    const char * value = TclGetString(fieldValues[1]);
	    valueLength = Tcl_NumUtfChars(value, fieldValues[1]->length);
	} else {
	    valueLength = 0;
	}

	/*
	 * Check that the formal parameter name is a scalar.
	 */


	argnamei = argname;
	argnamelast = argname[plen-1];
	while (plen--) {
	    if (argnamei[0] == '(') {
		if (argnamelast == ')') {	/* We have an array element. */
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "formal parameter \"%s\" is an array element",

	    if (procPtr->firstLocalPtr == NULL) {
		procPtr->firstLocalPtr = procPtr->lastLocalPtr = localPtr;
	    } else {
		procPtr->lastLocalPtr->nextPtr = localPtr;
		procPtr->lastLocalPtr = localPtr;
	    }
	    localPtr->nextPtr = NULL;
	    localPtr->nameLength = nameLength;
	    localPtr->frameIndex = i;
	    localPtr->flags = VAR_ARGUMENT;
	    localPtr->resolveInfo = NULL;

	    if (fieldCount == 2) {
		localPtr->defValuePtr = fieldValues[1];
		Tcl_IncrRefCount(localPtr->defValuePtr);

static int
ProcWrongNumArgs(
    Tcl_Interp *interp,
    int skip)
{
    CallFrame *framePtr = ((Interp *)interp)->varFramePtr;
    register Proc *procPtr = framePtr->procPtr;

    int localCt = procPtr->numCompiledLocals, numArgs, i;
    Tcl_Obj **desiredObjs;
    const char *final = NULL;

    /*
     * Build up desired argument list for Tcl_WrongNumArgs
     */

	desiredObjs[0] = framePtr->objv[skip-1];
#else
	desiredObjs[0] = Tcl_NewListObj(1, framePtr->objv + skip - 1);
#endif /* AVOID_HACKS_FOR_ITCL */
    }
    Tcl_IncrRefCount(desiredObjs[0]);

    if (localCt > 0) {
	register Var *defPtr = (Var *) (&framePtr->localCachePtr->varName0 + localCt);

	for (i=1 ; i<=numArgs ; i++, defPtr++) {
	    Tcl_Obj *argObj;
	    Tcl_Obj *namePtr = localName(framePtr, i-1);

	    if (defPtr->value.objPtr != NULL) {
		TclNewObj(argObj);
		Tcl_AppendStringsToObj(argObj, "?", TclGetString(namePtr), "?", NULL);
	    } else if (defPtr->flags & VAR_IS_ARGS) {
		numArgs--;
		final = "?arg ...?";
		break;
	    } else {
		argObj = namePtr;
		Tcl_IncrRefCount(namePtr);
	    }
	    desiredObjs[i] = argObj;
	}
    }

    Tcl_ResetResult(interp);
    Tcl_WrongNumArgs(interp, numArgs+1, desiredObjs, final);

    for (i=0 ; i<=numArgs ; i++) {
	Tcl_DecrRefCount(desiredObjs[i]);

	} else if (ch == '-') {
	    /*
	     * Check to see if this is the last character in the set, in which
	     * case it is not a range and we should add the previous character
	     * as well as the dash.
	     */

	    if (*format == ']' || !cset->ranges) {
		cset->chars[cset->nchars++] = start;
		cset->chars[cset->nchars++] = ch;
	    } else {
		format += TclUtfToUniChar(format, &ch);

		/*
		 * Check to see if the range is in reverse order.

	/*
	 * Step 3. Minimum field width.
	 */

	width = 0;
	if (isdigit(UCHAR(ch))) {
	    width = strtoul(format, &end, 10);
	    if (width < 0) {
		msg = overflow;
		errCode = "OVERFLOW";
		goto errorMsg;
	    }
	    format = end;
	    step = TclUtfToUniChar(format, &ch);
	} else if (ch == '*') {
	    if (objIndex >= objc - 1) {
		msg = badIndex[gotXpg];
		errCode = gotXpg ? "INDEXRANGE" : "FIELDVARMISMATCH";
		goto errorMsg;

/*
 * tclStubInit.c --
 *
 *	This file contains the initializers for the Tcl stub vectors.
 *
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tommath.h"

#ifdef __CYGWIN__
#   include <wchar.h>
#endif

#ifdef __GNUC__
#pragma GCC dependency "tcl.decls"
#pragma GCC dependency "tclInt.decls"
#pragma GCC dependency "tclTomMath.decls"
#endif

#elif defined(__CYGWIN__)
#   define TclpIsAtty TclPlatIsAtty
#   define TclWinSetInterfaces (void (*) (int)) doNothing
#   define TclWinAddProcess (void (*) (void *, unsigned int)) doNothing
#   define TclWinFlushDirtyChannels doNothing
#   define TclWinResetInterfaces doNothing





static int
TclpIsAtty(int fd)
{
    return isatty(fd);
}

#define TclWinGetPlatformId winGetPlatformId

char *
Tcl_WinUtfToTChar(
    const char *string,
    int len,
    Tcl_DString *dsPtr)
{
#if TCL_UTF_MAX > 4
    Tcl_UniChar ch = 0;
    wchar_t *w, *wString;
    const char *p, *end;
    int oldLength;
#endif

    Tcl_DStringInit(dsPtr);
    if (!string) {
	return NULL;
    }
#if TCL_UTF_MAX > 4

    if (len < 0) {
	len = strlen(string);
    }

    /*
     * Unicode string length in Tcl_UniChars will be <= UTF-8 string length in
     * bytes.
     */

    oldLength = Tcl_DStringLength(dsPtr);

    Tcl_DStringSetLength(dsPtr,
	    oldLength + (int) ((len + 1) * sizeof(wchar_t)));
    wString = (wchar_t *) (Tcl_DStringValue(dsPtr) + oldLength);

    w = wString;
    p = string;
    end = string + len - 4;
    while (p < end) {
	p += TclUtfToUniChar(p, &ch);
	if (ch > 0xFFFF) {
	    *w++ = (wchar_t) (0xD800 + ((ch -= 0x10000) >> 10));
	    *w++ = (wchar_t) (0xDC00 | (ch & 0x3FF));
	} else {
	    *w++ = ch;
	}
    }
    end += 4;
    while (p < end) {
	if (Tcl_UtfCharComplete(p, end-p)) {
	    p += TclUtfToUniChar(p, &ch);
	} else {
	    ch = UCHAR(*p++);
	}
	if (ch > 0xFFFF) {
	    *w++ = (wchar_t) (0xD800 + ((ch -= 0x10000) >> 10));
	    *w++ = (wchar_t) (0xDC00 | (ch & 0x3FF));
	} else {
	    *w++ = ch;
	}
    }
    *w = '\0';
    Tcl_DStringSetLength(dsPtr,
	    oldLength + ((char *) w - (char *) wString));

    return (char *)wString;
#else
    return (char *)Tcl_UtfToUniCharDString(string, len, dsPtr);
#endif
}

char *
Tcl_WinTCharToUtf(
    const char *string,
    int len,
    Tcl_DString *dsPtr)
{
#if TCL_UTF_MAX > 4
    const wchar_t *w, *wEnd;
    char *p, *result;
    int oldLength, blen = 1;
#endif

    Tcl_DStringInit(dsPtr);
    if (!string) {
	return NULL;
    }
    if (len < 0) {
	len = wcslen((wchar_t *)string);
    } else {
	len /= 2;
    }

#if TCL_UTF_MAX > 4
    oldLength = Tcl_DStringLength(dsPtr);
    Tcl_DStringSetLength(dsPtr, oldLength + (len + 1) * 4);
    result = Tcl_DStringValue(dsPtr) + oldLength;

    p = result;
    wEnd = (wchar_t *)string + len;
    for (w = (wchar_t *)string; w < wEnd; ) {
	if (!blen && ((*w & 0xFC00) != 0xDC00)) {
	    /* Special case for handling upper surrogates. */
	    p += Tcl_UniCharToUtf(-1, p);
	}
	blen = Tcl_UniCharToUtf(*w, p);
	p += blen;
	w++;
    }
    if (!blen) {
	/* Special case for handling upper surrogates. */
	p += Tcl_UniCharToUtf(-1, p);
    }
    Tcl_DStringSetLength(dsPtr, oldLength + (p - result));

    return result;
#else




    return Tcl_UniCharToUtfDString((Tcl_UniChar *)string, len, dsPtr);
#endif
}

#if defined(TCL_WIDE_INT_IS_LONG)
/* On Cygwin64, long is 64-bit while on Win64 long is 32-bit. Therefore
 * we have to make sure that all stub entries on Cygwin64 follow the Win64
 * signature. Tcl 9 must find a better solution, but that cannot be done

			/*
			 * We need to remove the interpreter-wide trace which
			 * we created to allow 'step' traces.
			 */

			Tcl_DeleteTrace(interp, tcmdPtr->stepTrace);
			tcmdPtr->stepTrace = NULL;

			ckfree(tcmdPtr->startCmd);

		    }
		    if (tcmdPtr->flags & TCL_TRACE_EXEC_IN_PROGRESS) {
			/*
			 * Postpone deletion.
			 */

			tcmdPtr->flags = 0;

    if (flags & (TCL_TRACE_DESTROYED | TCL_TRACE_DELETE)) {
	int untraceFlags = tcmdPtr->flags;
	Tcl_InterpState state;

	if (tcmdPtr->stepTrace != NULL) {
	    Tcl_DeleteTrace(interp, tcmdPtr->stepTrace);
	    tcmdPtr->stepTrace = NULL;

	    ckfree(tcmdPtr->startCmd);

	}
	if (tcmdPtr->flags & TCL_TRACE_EXEC_IN_PROGRESS) {
	    /*
	     * Postpone deletion, until exec trace returns.
	     */

	    tcmdPtr->flags = 0;

	 */

	if ((flags & TCL_TRACE_LEAVE_EXEC) && (tcmdPtr->stepTrace != NULL)
		&& (level == tcmdPtr->startLevel)
		&& (strcmp(command, tcmdPtr->startCmd) == 0)) {
	    Tcl_DeleteTrace(interp, tcmdPtr->stepTrace);
	    tcmdPtr->stepTrace = NULL;

	    ckfree(tcmdPtr->startCmd);

	}

	/*
	 * Second, create the tcl callback, if required.
	 */

	if (call) {

		   TraceExecutionProc, tcmdPtr, CommandObjTraceDeleted);
	}
    }
    if (flags & TCL_TRACE_DESTROYED) {
	if (tcmdPtr->stepTrace != NULL) {
	    Tcl_DeleteTrace(interp, tcmdPtr->stepTrace);
	    tcmdPtr->stepTrace = NULL;

	    ckfree(tcmdPtr->startCmd);

	}
    }
    if (call) {
	if (tcmdPtr->refCount-- <= 1) {
	    ckfree(tcmdPtr);
	}
    }

    /*
     * UTF-8 string length in bytes will be <= Unicode string length *
     * TCL_UTF_MAX.
     */

    oldLength = Tcl_DStringLength(dsPtr);
    Tcl_DStringSetLength(dsPtr, oldLength + (uniLength + 1) * TCL_UTF_MAX);
    string = Tcl_DStringValue(dsPtr) + oldLength;

    p = string;
    wEnd = uniStr + uniLength;
    for (w = uniStr; w < wEnd; ) {
	p += Tcl_UniCharToUtf(*w, p);
	w++;

    /*
     * Unicode string length in Tcl_UniChars will be <= UTF-8 string length in
     * bytes.
     */

    oldLength = Tcl_DStringLength(dsPtr);

    Tcl_DStringSetLength(dsPtr,
	    oldLength + (int) ((length + 1) * sizeof(Tcl_UniChar)));
    wString = (Tcl_UniChar *) (Tcl_DStringValue(dsPtr) + oldLength);

    w = wString;
    p = src;
    end = src + length - TCL_UTF_MAX;
    while (p < end) {
	p += TclUtfToUniChar(p, &ch);
	*w++ = ch;
    }
    end += TCL_UTF_MAX;
    while (p < end) {
	if (Tcl_UtfCharComplete(p, end-p)) {
	    p += TclUtfToUniChar(p, &ch);
	} else {
	    ch = UCHAR(*p++);
	}
	*w++ = ch;
    }
    *w = '\0';
    Tcl_DStringSetLength(dsPtr,
	    (oldLength + ((char *) w - (char *) wString)));

    return wString;

	/*
	 * Empty string element must be brace quoted.
	 */

	*flagPtr = CONVERT_BRACE;
	return 2;
    }

#if COMPAT
    /*
     * We have an established history in TclConvertElement() when quoting
     * because of a leading hash character to force what would be the
     * CONVERT_MASK mode into the CONVERT_BRACE mode. That is, we format
     * the element #{a"b} like this:
     *			{#{a"b}}
     * and not like this:
     *			\#{a\"b}
     * This is inconsistent with [list x{a"b}], but we will not change that now.
     * Set that preference here so that we compute a tight size requirement.
     */
    if ((*src == '#') && !(*flagPtr & TCL_DONT_QUOTE_HASH)) {
	preferBrace = 1;
    }
#endif

    if ((*p == '{') || (*p == '"')) {
	/*
	 * Must escape or protect so leading character of value is not
	 * misinterpreted as list element delimiting syntax.
	 */

		}
	    } else {		/* Var wasn't found and not to create it. */
		*errMsgPtr = noSuchVar;
		return NULL;
	    }
	}
    } else {			/* Local var: look in frame varFramePtr. */
	int localCt = varFramePtr->numCompiledLocals;

	if (localCt > 0) {
	    Tcl_Obj **objPtrPtr = &varFramePtr->localCachePtr->varName0;
	    const char *localNameStr;
	    int localLen;

	    for (i=0 ; i<localCt ; i++, objPtrPtr++) {
		register Tcl_Obj *objPtr = *objPtrPtr;

		if (objPtr) {
		    localNameStr = TclGetStringFromObj(objPtr, &localLen);

		    if ((varLen == localLen) && (varName[0] == localNameStr[0])
			&& !memcmp(varName, localNameStr, varLen)) {
			*indexPtr = i;
			return (Var *) &varFramePtr->compiledLocals[i];
		    }
		}
	    }
	}
	tablePtr = varFramePtr->varTablePtr;
	if (create) {
	    if (tablePtr == NULL) {
		tablePtr = ckalloc(sizeof(TclVarHashTable));

    Tcl_Obj *listPtr,		/* List object to append names to. */
    Tcl_Obj *patternPtr,	/* Pattern to match against. */
    int includeLinks)		/* 1 if upvars should be included, else 0. */
{
    Interp *iPtr = (Interp *) interp;
    Var *varPtr;
    int i, localVarCt, added;
    Tcl_Obj *objNamePtr;
    const char *varName;
    TclVarHashTable *localVarTablePtr;
    Tcl_HashSearch search;
    Tcl_HashTable addedTable;
    const char *pattern = patternPtr? TclGetString(patternPtr) : NULL;

    localVarCt = iPtr->varFramePtr->numCompiledLocals;
    varPtr = iPtr->varFramePtr->compiledLocals;
    localVarTablePtr = iPtr->varFramePtr->varTablePtr;

    if (includeLinks) {
	Tcl_InitObjHashTable(&addedTable);
    }

    if (localVarCt > 0) {
	Tcl_Obj **varNamePtr = &iPtr->varFramePtr->localCachePtr->varName0;

	for (i = 0; i < localVarCt; i++, varNamePtr++) {
	    /*
	     * Skip nameless (temporary) variables and undefined variables.
	     */

	    if (*varNamePtr && !TclIsVarUndefined(varPtr)
		&& (includeLinks || !TclIsVarLink(varPtr))) {
		varName = TclGetString(*varNamePtr);
		if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) {
		    Tcl_ListObjAppendElement(interp, listPtr, *varNamePtr);
		    if (includeLinks) {
			Tcl_CreateHashEntry(&addedTable, *varNamePtr, &added);
		    }
		}
	    }
	    varPtr++;
	}
    }

    /*
     * Do nothing if no local variables.
     */

    if (localVarTablePtr == NULL) {

	}
    } else {
	Tcl_ListObjLength(NULL, zshPtr->outData, &listLen);
	if (count == -1) {
	    count = 0;
	    for (i=0; i<listLen; i++) {
		Tcl_ListObjIndex(NULL, zshPtr->outData, i, &itemObj);
		(void) Tcl_GetByteArrayFromObj(itemObj, &itemLen);
		if (i == 0) {
		    count += itemLen - zshPtr->outPos;
		} else {
		    count += itemLen;
		}
	    }
	}

if {([info commands ::tcl::pkgconfig] eq "")
	|| ([info sharedlibextension] ne ".dll")} return
if {[::tcl::pkgconfig get debug]} {
    package ifneeded dde 1.4.1 [list load [file join $dir tcldde14g.dll] dde]
} else {
    package ifneeded dde 1.4.1 [list load [file join $dir tcldde14.dll] dde]
}

# http.tcl --
#
#	Client-side HTTP for GET, POST, and HEAD commands. These routines can
#	be used in untrusted code that uses the Safesock security policy.
#	These procedures use a callback interface to avoid using vwait, which
#	is not defined in the safe base.
#
# See the file "license.terms" for information on usage and redistribution of
# this file, and for a DISCLAIMER OF ALL WARRANTIES.

package require Tcl 8.6-
# Keep this in sync with pkgIndex.tcl and with the install directories in
# Makefiles
package provide http 2.9.0

namespace eval http {
    # Allow resourcing to not clobber existing data

    variable http
    if {![info exists http]} {
	array set http {
	    -accept */*
	    -pipeline 1
	    -postfresh 0
	    -proxyhost {}
	    -proxyport {}
	    -proxyfilter http::ProxyRequired
	    -repost 0
	    -urlencoding utf-8
	    -zip 1
	}
	# We need a useragent string of this style or various servers will
	# refuse to send us compressed content even when we ask for it. This
	# follows the de-facto layout of user-agent strings in current browsers.
	# Safe interpreters do not have ::tcl_platform(os) or
	# ::tcl_platform(osVersion).
	if {[interp issafe]} {
	    set http(-useragent) "Mozilla/5.0\
		(Windows; U;\
		Windows NT 10.0)\
		http/[package provide http] Tcl/[package provide Tcl]"
	} else {
	    set http(-useragent) "Mozilla/5.0\
		([string totitle $::tcl_platform(platform)]; U;\
		$::tcl_platform(os) $::tcl_platform(osVersion))\
		http/[package provide http] Tcl/[package provide Tcl]"
	}
    }

    proc init {} {
	# Set up the map for quoting chars. RFC3986 Section 2.3 say percent
	# encode all except: "... percent-encoded octets in the ranges of
	# ALPHA (%41-%5A and %61-%7A), DIGIT (%30-%39), hyphen (%2D), period
	# (%2E), underscore (%5F), or tilde (%7E) should not be created by URI
	# producers ..."
	for {set i 0} {$i <= 256} {incr i} {
	    set c [format %c $i]
	    if {![string match {[-._~a-zA-Z0-9]} $c]} {
		set map($c) %[format %.2X $i]
	    }
	}
	# These are handled specially
	set map(\n) %0D%0A
	variable formMap [array get map]

	# Create a map for HTTP/1.1 open sockets
	variable socketMapping
	variable socketRdState
	variable socketWrState
	variable socketRdQueue
	variable socketWrQueue
	variable socketClosing
	variable socketPlayCmd
	if {[info exists socketMapping]} {
	    # Close open sockets on re-init.  Do not permit retries.
	    foreach {url sock} [array get socketMapping] {
		unset -nocomplain socketClosing($url)
		unset -nocomplain socketPlayCmd($url)
		CloseSocket $sock
	    }
	}

	# CloseSocket should have unset the socket* arrays, one element at
	# a time.  Now unset anything that was overlooked.
	# Traces on "unset socketRdState(*)" will call CancelReadPipeline and
	# cancel any queued responses.
	# Traces on "unset socketWrState(*)" will call CancelWritePipeline and
	# cancel any queued requests.
	array unset socketMapping
	array unset socketRdState
	array unset socketWrState
	array unset socketRdQueue
	array unset socketWrQueue
	array unset socketClosing
	array unset socketPlayCmd
	array set socketMapping {}
	array set socketRdState {}
	array set socketWrState {}
	array set socketRdQueue {}
	array set socketWrQueue {}
	array set socketClosing {}
	array set socketPlayCmd {}
    }
    init

    variable urlTypes
    if {![info exists urlTypes]} {
	set urlTypes(http) [list 80 ::socket]
    }

    # Let user control default keepalive for compatibility
    variable defaultKeepalive
    if {![info exists defaultKeepalive]} {
	set defaultKeepalive 0
    }

    namespace export geturl config reset wait formatQuery quoteString
    namespace export register unregister registerError
    # - Useful, but not exported: data, size, status, code, cleanup, error,
    #   meta, ncode, mapReply, init.  Comments suggest that "init" can be used
    #   for re-initialisation, although the command is undocumented.
    # - Not exported, probably should be upper-case initial letter as part
    #   of the internals: getTextLine, make-transformation-chunked.
}

# http::Log --
#
#	Debugging output -- define this to observe HTTP/1.1 socket usage.
#	Should echo any args received.
#

# http::Finish --
#
#	Clean up the socket and eval close time callbacks
#
# Arguments:
#	token	    Connection token.
#	errormsg    (optional) If set, forces status to error.
#	skipCB      (optional) If set, don't call the -command callback. This
#		    is useful when geturl wants to throw an exception instead
#		    of calling the callback. That way, the same error isn't
#		    reported to two places.
#
# Side Effects:
#        May close the socket.

proc http::Finish {token {errormsg ""} {skipCB 0}} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    global errorInfo errorCode
    set closeQueue 0
    if {$errormsg ne ""} {
	set state(error) [list $errormsg $errorInfo $errorCode]
	set state(status) "error"
    }
    if {[info commands ${token}EventCoroutine] ne {}} {
	rename ${token}EventCoroutine {}
    }
    if {  ($state(status) eq "timeout")
       || ($state(status) eq "error")
       || ($state(status) eq "eof")
       || ([info exists state(-keepalive)] && !$state(-keepalive))
       || ([info exists state(connection)] && ($state(connection) eq "close"))
    } {
	set closeQueue 1
	set connId $state(socketinfo)
	set sock $state(sock)
	CloseSocket $state(sock) $token
    } elseif {
	  ([info exists state(-keepalive)] && $state(-keepalive))
       && ([info exists state(connection)] && ($state(connection) ne "close"))
    } {
	KeepSocket $token
    }
    if {[info exists state(after)]} {
	after cancel $state(after)
	unset state(after)
    }
    if {[info exists state(-command)] && (!$skipCB)
	    && (![info exists state(done-command-cb)])} {
	set state(done-command-cb) yes
	if {[catch {eval $state(-command) {$token}} err] && $errormsg eq ""} {
	    set state(error) [list $err $errorInfo $errorCode]
	    set state(status) error
	}
    }

    if {    $closeQueue
	 && [info exists socketMapping($connId)]
	 && ($socketMapping($connId) eq $sock)
    } {
	http::CloseQueuedQueries $connId $token
    }
}

# http::KeepSocket -
#
#	Keep a socket in the persistent sockets table and connect it to its next
#	queued task if possible.  Otherwise leave it idle and ready for its next
#	use.
#
#	If $socketClosing(*), then ($state(connection) eq "close") and therefore
#	this command will not be called by Finish.
#
# Arguments:
#	token	    Connection token.

proc http::KeepSocket {token} {
    variable http
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]

    # Keep this socket open for another request ("Keep-Alive").
    # React if the server half-closes the socket.
    # Discussion is in http::geturl.
    catch {fileevent $state(sock) readable [list http::CheckEof $state(sock)]}

    # The line below should not be changed in production code.
    # It is edited by the test suite.
    set TEST_EOF 0
    if {$TEST_EOF} {
	# ONLY for testing reaction to server eof.
	# No server timeouts will be caught.
	catch {fileevent $state(sock) readable {}}
    }

    if {    [info exists state(socketinfo)]
	 && [info exists socketMapping($state(socketinfo))]
    } {
	set connId $state(socketinfo)
	# The value "Rready" is set only here.
	set socketRdState($connId) Rready

	if {    $state(-pipeline)
	     && [info exists socketRdQueue($connId)]
	     && [llength $socketRdQueue($connId)]
	} {
	    # The usual case for pipelined responses - if another response is
	    # queued, arrange to read it.
	    set token3 [lindex $socketRdQueue($connId) 0]
	    set socketRdQueue($connId) [lrange $socketRdQueue($connId) 1 end]
	    variable $token3
	    upvar 0 $token3 state3
	    set tk2 [namespace tail $token3]

	    #Log pipelined, GRANT read access to $token3 in KeepSocket
	    set socketRdState($connId) $token3
	    ReceiveResponse $token3

	    # Other pipelined cases.
	    # - The test above ensures that, for the pipelined cases in the two
	    #   tests below, the read queue is empty.
	    # - In those two tests, check whether the next write will be
	    #   nonpipeline.
	} elseif {
		$state(-pipeline)
	     && [info exists socketWrState($connId)]
	     && ($socketWrState($connId) eq "peNding")

	     && [info exists socketWrQueue($connId)]
	     && [llength $socketWrQueue($connId)]
	     && (![set token3 [lindex $socketWrQueue($connId) 0]
		   set ${token3}(-pipeline)
		  ]
		)
	} {
	    # This case:
	    # - Now it the time to run the "pending" request.
	    # - The next token in the write queue is nonpipeline, and
	    #   socketWrState has been marked "pending" (in
	    #   http::NextPipelinedWrite or http::geturl) so a new pipelined
	    #   request cannot jump the queue.
	    #
	    # Tests:
	    # - In this case the read queue (tested above) is empty and this
	    #   "pending" write token is in front of the rest of the write
	    #   queue.
	    # - The write state is not Wready and therefore appears to be busy,
	    #   but because it is "pending" we know that it is reserved for the
	    #   first item in the write queue, a non-pipelined request that is
	    #   waiting for the read queue to empty.  That has now happened: so
	    #   give that request read and write access.
	    variable $token3
	    set conn [set ${token3}(tmpConnArgs)]
	    #Log nonpipeline, GRANT r/w access to $token3 in KeepSocket
	    set socketRdState($connId) $token3
	    set socketWrState($connId) $token3
	    set socketWrQueue($connId) [lrange $socketWrQueue($connId) 1 end]
	    # Connect does its own fconfigure.
	    fileevent $state(sock) writable [list http::Connect $token3 {*}$conn]
	    #Log ---- $state(sock) << conn to $token3 for HTTP request (c)

	} elseif {
		$state(-pipeline)
	     && [info exists socketWrState($connId)]
	     && ($socketWrState($connId) eq "peNding")

	} {
	    # Should not come here.  The second block in the previous "elseif"
	    # test should be tautologous (but was needed in an earlier
	    # implementation) and will be removed after testing.
	    # If we get here, the value "pending" was assigned in error.
	    # This error would block the queue for ever.
	    Log ^X$tk <<<<< Error in queueing of requests >>>>> - token $token

	} elseif {
		$state(-pipeline)
	     && [info exists socketWrState($connId)]
	     && ($socketWrState($connId) eq "Wready")

	     && [info exists socketWrQueue($connId)]
	     && [llength $socketWrQueue($connId)]
	     && (![set token3 [lindex $socketWrQueue($connId) 0]
		   set ${token3}(-pipeline)
		  ]
		)
	} {
	    # This case:
	    # - The next token in the write queue is nonpipeline, and
	    #   socketWrState is Wready.  Get the next event from socketWrQueue.
	    # Tests:
	    # - In this case the read state (tested above) is Rready and the
	    #   write state (tested here) is Wready - there is no "pending"
	    #   request.
	    # Code:
	    # - The code is the same as the code below for the nonpipelined
	    #   case with a queued request.
	    variable $token3
	    set conn [set ${token3}(tmpConnArgs)]
	    #Log nonpipeline, GRANT r/w access to $token3 in KeepSocket
	    set socketRdState($connId) $token3
	    set socketWrState($connId) $token3
	    set socketWrQueue($connId) [lrange $socketWrQueue($connId) 1 end]
	    # Connect does its own fconfigure.
	    fileevent $state(sock) writable [list http::Connect $token3 {*}$conn]
	    #Log ---- $state(sock) << conn to $token3 for HTTP request (c)

	} elseif {
		(!$state(-pipeline))
	     && [info exists socketWrQueue($connId)]
	     && [llength $socketWrQueue($connId)]
	     && ($state(connection) ne "close")
	} {
	    # If not pipelined, (socketRdState eq Rready) tells us that we are
	    # ready for the next write - there is no need to check
	    # socketWrState. Write the next request, if one is waiting.
	    # If the next request is pipelined, it receives premature read
	    # access to the socket. This is not a problem.
	    set token3 [lindex $socketWrQueue($connId) 0]
	    variable $token3
	    set conn [set ${token3}(tmpConnArgs)]
	    #Log nonpipeline, GRANT r/w access to $token3 in KeepSocket
	    set socketRdState($connId) $token3
	    set socketWrState($connId) $token3
	    set socketWrQueue($connId) [lrange $socketWrQueue($connId) 1 end]
	    # Connect does its own fconfigure.
	    fileevent $state(sock) writable [list http::Connect $token3 {*}$conn]
	    #Log ---- $state(sock) << conn to $token3 for HTTP request (d)

	} elseif {(!$state(-pipeline))} {
	    set socketWrState($connId) Wready
	    # Rready and Wready and idle: nothing to do.
	}

    } else {
	CloseSocket $state(sock) $token
	# There is no socketMapping($state(socketinfo)), so it does not matter
	# that CloseQueuedQueries is not called.
    }
}

# http::CheckEof -
#
#	Read from a socket and close it if eof.
#	The command is bound to "fileevent readable" on an idle socket, and
#	"eof" is the only event that should trigger the binding, occurring when
#	the server times out and half-closes the socket.
#
#	A read is necessary so that [eof] gives a meaningful result.
#	Any bytes sent are junk (or a bug).

proc http::CheckEof {sock} {
    set junk [read $sock]
    set n [string length $junk]
    if {$n} {
	Log "WARNING: $n bytes received but no HTTP request sent"
    }

    if {[catch {eof $sock} res] || $res} {
	# The server has half-closed the socket.
	# If a new write has started, its transaction will fail and
	# will then be error-handled.
	CloseSocket $sock
    }
}

# http::CloseSocket -
#
#	Close a socket and remove it from the persistent sockets table.  If
#	possible an http token is included here but when we are called from a
#	fileevent on remote closure we need to find the correct entry - hence
#	the "else" block of the first "if" command.

proc http::CloseSocket {s {token {}}} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    set tk [namespace tail $token]

    catch {fileevent $s readable {}}
    set connId {}
    if {$token ne ""} {
	variable $token
	upvar 0 $token state
	if {[info exists state(socketinfo)]} {
	    set connId $state(socketinfo)
	}
    } else {
	set map [array get socketMapping]
	set ndx [lsearch -exact $map $s]
	if {$ndx != -1} {
	    incr ndx -1
	    set connId [lindex $map $ndx]
	}
    }
    if {    ($connId ne {})
	 && [info exists socketMapping($connId)]
	 && ($socketMapping($connId) eq $s)
    } {
	Log "Closing connection $connId (sock $socketMapping($connId))"
	if {[catch {close $socketMapping($connId)} err]} {
	    Log "Error closing connection: $err"
	}
	if {$token eq {}} {
	    # Cases with a non-empty token are handled by Finish, so the tokens
	    # are finished in connection order.
	    http::CloseQueuedQueries $connId
	}
    } else {
	Log "Closing socket $s (no connection info)"
	if {[catch {close $s} err]} {
	    Log "Error closing socket: $err"
	}
    }
}

# http::CloseQueuedQueries
#
#	connId  - identifier "domain:port" for the connection
#	token   - (optional) used only for logging
#
# Called from http::CloseSocket and http::Finish, after a connection is closed,
# to clear the read and write queues if this has not already been done.

proc http::CloseQueuedQueries {connId {token {}}} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    if {![info exists socketMapping($connId)]} {
	# Command has already been called.
	# Don't come here again - especially recursively.
	return
    }

    # Used only for logging.
    if {$token eq {}} {
	set tk {}
    } else {
	set tk [namespace tail $token]
    }

    if {    [info exists socketPlayCmd($connId)]
	 && ($socketPlayCmd($connId) ne {ReplayIfClose Wready {} {}})
    } {
	# Before unsetting, there is some unfinished business.
	# - If the server sent "Connection: close", we have stored the command
	#   for retrying any queued requests in socketPlayCmd, so copy that
	#   value for execution below.  socketClosing(*) was also set.
	# - Also clear the queues to prevent calls to Finish that would set the
	#   state for the requests that will be retried to "finished with error
	#   status".
	set unfinished $socketPlayCmd($connId)
	set socketRdQueue($connId) {}
	set socketWrQueue($connId) {}
    } else {
	set unfinished {}
    }

    Unset $connId

    if {$unfinished ne {}} {
	Log ^R$tk Any unfinished transactions (excluding $token) failed \
		- token $token
	{*}$unfinished
    }
}

# http::Unset

#
#	The trace on "unset socketRdState(*)" will call CancelReadPipeline
#	and cancel any queued responses.
#	The trace on "unset socketWrState(*)" will call CancelWritePipeline
#	and cancel any queued requests.

proc http::Unset {connId} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    unset socketMapping($connId)
    unset socketRdState($connId)
    unset socketWrState($connId)
    unset -nocomplain socketRdQueue($connId)
    unset -nocomplain socketWrQueue($connId)
    unset -nocomplain socketClosing($connId)
    unset -nocomplain socketPlayCmd($connId)
}

# http::reset --
#
#	See documentation for details.
#
# Arguments:
#	token	Connection token.
#	why	Status info.
#
# Side Effects:
#        See Finish

proc http::reset {token {why reset}} {
    variable $token
    upvar 0 $token state
    set state(status) $why
    catch {fileevent $state(sock) readable {}}
    catch {fileevent $state(sock) writable {}}
    Finish $token
    if {[info exists state(error)]} {
	set errorlist $state(error)
	unset state
	eval ::error $errorlist
    }
}

# http::geturl --
#
#	Establishes a connection to a remote url via http.
#
# Arguments:
#	url		The http URL to goget.
#	args		Option value pairs. Valid options include:
#				-blocksize, -validate, -headers, -timeout
# Results:
#	Returns a token for this connection. This token is the name of an
#	array that the caller should unset to garbage collect the state.

proc http::geturl {url args} {
    variable http
    variable urlTypes
    variable defaultCharset
    variable defaultKeepalive
    variable strict

    # Initialize the state variable, an array. We'll return the name of this
    # array as the token for the transaction.

    if {![info exists http(uid)]} {
	set http(uid) 0
    }
    set token [namespace current]::[incr http(uid)]
    ##Log Starting http::geturl - token $token
    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    reset $token
    Log ^A$tk URL $url - token $token

    # Process command options.

    array set state {
	-binary		false
	-blocksize	8192
	-queryblocksize 8192
	-validate	0
	-headers	{}
	-timeout	0
	-type		application/x-www-form-urlencoded
	-queryprogress	{}
	-protocol	1.1
	binary		0
	state		created
	meta		{}
	method		{}
	coding		{}
	currentsize	0
	totalsize	0
	querylength	0
	queryoffset	0
	type		text/html
	body		{}

    if {$port != $defport} {
	append url : $port
    }
    append url $srvurl
    # Don't append the fragment!
    set state(url) $url




    set sockopts [list -async]





    # If we are using the proxy, we must pass in the full URL that includes
    # the server name.

    if {[info exists phost] && ($phost ne "")} {
	set srvurl $url
	set targetAddr [list $phost $pport]
    } else {
	set targetAddr [list $host $port]
    }
    # Proxy connections aren't shared among different hosts.
    set state(socketinfo) $host:$port

    # Save the accept types at this point to prevent a race condition. [Bug
    # c11a51c482]
    set state(accept-types) $http(-accept)

    if {$isQuery || $isQueryChannel} {
	# It's a POST.
	# A client wishing to send a non-idempotent request SHOULD wait to send
	# that request until it has received the response status for the
	# previous request.
	if {$http(-postfresh)} {
	    # Override -keepalive for a POST.  Use a new connection, and thus
	    # avoid the small risk of a race against server timeout.
	    set state(-keepalive) 0
	} else {
	    # Allow -keepalive but do not -pipeline - wait for the previous
	    # transaction to finish.
	    # There is a small risk of a race against server timeout.
	    set state(-pipeline) 0
	}
    } else {
	# It's a GET or HEAD.
	set state(-pipeline) $http(-pipeline)
    }

    # See if we are supposed to use a previously opened channel.
    # - In principle, ANY call to http::geturl could use a previously opened
    #   channel if it is available - the "Connection: keep-alive" header is a
    #   request to leave the channel open AFTER completion of this call.
    # - In fact, we try to use an existing channel only if -keepalive 1 -- this
    #   means that at most one channel is left open for each value of
    #   $state(socketinfo). This property simplifies the mapping of open
    #   channels.
    set reusing 0
    set alreadyQueued 0
    if {$state(-keepalive)} {
	variable socketMapping
	variable socketRdState
	variable socketWrState
	variable socketRdQueue
	variable socketWrQueue
	variable socketClosing
	variable socketPlayCmd

	if {[info exists socketMapping($state(socketinfo))]} {
	    # - If the connection is idle, it has a "fileevent readable" binding
	    #   to http::CheckEof, in case the server times out and half-closes
	    #   the socket (http::CheckEof closes the other half).
	    # - We leave this binding in place until just before the last
	    #   puts+flush in http::Connected (GET/HEAD) or http::Write (POST),
	    #   after which the HTTP response might be generated.

	    if {    [info exists socketClosing($state(socketinfo))]
		       && $socketClosing($state(socketinfo))
	    } {
		# socketClosing(*) is set because the server has sent a
		# "Connection: close" header.
		# Do not use the persistent socket again.
		# Since we have only one persistent socket per server, and the
		# old socket is not yet dead, add the request to the write queue
		# of the dying socket, which will be replayed by ReplayIfClose.
		# Also add it to socketWrQueue(*) which is used only if an error
		# causes a call to Finish.
		set reusing 1
		set sock $socketMapping($state(socketinfo))
		Log "reusing socket $sock for $state(socketinfo) - token $token"

		set alreadyQueued 1
		lassign $socketPlayCmd($state(socketinfo)) com0 com1 com2 com3
		lappend com3 $token
		set socketPlayCmd($state(socketinfo)) [list $com0 $com1 $com2 $com3]
		lappend socketWrQueue($state(socketinfo)) $token
	    } elseif {[catch {fconfigure $socketMapping($state(socketinfo))}]} {
		# FIXME Is it still possible for this code to be executed? If
		#       so, this could be another place to call TestForReplay,
		#       rather than discarding the queued transactions.
		Log "WARNING: socket for $state(socketinfo) was closed\
			- token $token"
		Log "WARNING - if testing, pay special attention to this\
			case (GH) which is seldom executed - token $token"

		# This will call CancelReadPipeline, CancelWritePipeline, and
		# cancel any queued requests, responses.
		Unset $state(socketinfo)
	    } else {
		# Use the persistent socket.
		# The socket may not be ready to write: an earlier request might
		# still be still writing (in the pipelined case) or
		# writing/reading (in the nonpipeline case). This possibility
		# is handled by socketWrQueue later in this command.
		set reusing 1
		set sock $socketMapping($state(socketinfo))
		Log "reusing socket $sock for $state(socketinfo) - token $token"



	    }
	    # Do not automatically close the connection socket.
	    set state(connection) {}
	}
    }

    if {$reusing} {
	# Define state(tmpState) and state(tmpOpenCmd) for use
	# by http::ReplayIfDead if the persistent connection has died.
	set state(tmpState) [array get state]

	# Pass -myaddr directly to the socket command
	if {[info exists state(-myaddr)]} {
	    lappend sockopts -myaddr $state(-myaddr)
	}

	set state(tmpOpenCmd) [list {*}$defcmd {*}$sockopts {*}$targetAddr]
    }

    set state(reusing) $reusing
    # Excluding ReplayIfDead and the decision whether to call it, there are four
    # places outside http::geturl where state(reusing) is used:
    # - Connected   - if reusing and not pipelined, start the state(-timeout)
    #                 timeout (when writing).
    # - DoneRequest - if reusing and pipelined, send the next pipelined write
    # - Event       - if reusing and pipelined, start the state(-timeout)
    #                 timeout (when reading).
    # - Event       - if (not reusing) and pipelined, send the next pipelined
    #                 write

    # See comments above re the start of this timeout in other cases.
    if {(!$state(reusing)) && ($state(-timeout) > 0)} {
	set state(after) [after $state(-timeout) \
		[list http::reset $token timeout]]
    }

    if {![info exists sock]} {
	# Pass -myaddr directly to the socket command
	if {[info exists state(-myaddr)]} {
	    lappend sockopts -myaddr $state(-myaddr)
	}
	set pre [clock milliseconds]
	##Log pre socket opened, - token $token
	##Log [concat $defcmd $sockopts $targetAddr] - token $token
	if {[catch {eval $defcmd $sockopts $targetAddr} sock errdict]} {
	    # Something went wrong while trying to establish the connection.
	    # Clean up after events and such, but DON'T call the command
	    # callback (if available) because we're going to throw an
	    # exception from here instead.

	    set state(sock) NONE
	    Finish $token $sock 1
	    cleanup $token
	    dict unset errdict -level
	    return -options $errdict $sock
	} else {
	    # Initialisation of a new socket.
	    ##Log post socket opened, - token $token
	    ##Log socket opened, now fconfigure - token $token
	    set delay [expr {[clock milliseconds] - $pre}]
	    if {$delay > 3000} {
		Log socket delay $delay - token $token
	    }
	    fconfigure $sock -translation {auto crlf} \
			     -buffersize $state(-blocksize)
	    ##Log socket opened, DONE fconfigure - token $token
	}
    }
    # Command [socket] is called with -async, but takes 5s to 5.1s to return,
    # with probability of order 1 in 10,000.  This may be a bizarre scheduling
    # issue with my (KJN's) system (Fedora Linux).
    # This does not cause a problem (unless the request times out when this
    # command returns).

    set state(sock) $sock
    Log "Using $sock for $state(socketinfo) - token $token" \
	[expr {$state(-keepalive)?"keepalive":""}]

    if {    $state(-keepalive)
	 && (![info exists socketMapping($state(socketinfo))])
    } {
	# Freshly-opened socket that we would like to become persistent.
	set socketMapping($state(socketinfo)) $sock

	if {![info exists socketRdState($state(socketinfo))]} {
	    set socketRdState($state(socketinfo)) {}
	    set varName ::http::socketRdState($state(socketinfo))
	    trace add variable $varName unset ::http::CancelReadPipeline
	}
	if {![info exists socketWrState($state(socketinfo))]} {
	    set socketWrState($state(socketinfo)) {}
	    set varName ::http::socketWrState($state(socketinfo))
	    trace add variable $varName unset ::http::CancelWritePipeline
	}

	if {$state(-pipeline)} {
	    #Log new, init for pipelined, GRANT write access to $token in geturl
	    # Also grant premature read access to the socket. This is OK.
	    set socketRdState($state(socketinfo)) $token
	    set socketWrState($state(socketinfo)) $token
	} else {
	    # socketWrState is not used by this non-pipelined transaction.
	    # We cannot leave it as "Wready" because the next call to
	    # http::geturl with a pipelined transaction would conclude that the
	    # socket is available for writing.
	    #Log new, init for nonpipeline, GRANT r/w access to $token in geturl
	    set socketRdState($state(socketinfo)) $token
	    set socketWrState($state(socketinfo)) $token
	}

	set socketRdQueue($state(socketinfo)) {}
	set socketWrQueue($state(socketinfo)) {}
	set socketClosing($state(socketinfo)) 0
	set socketPlayCmd($state(socketinfo)) {ReplayIfClose Wready {} {}}
    }

    if {![info exists phost]} {
	set phost ""
    }
    if {$reusing} {
	# For use by http::ReplayIfDead if the persistent connection has died.
	# Also used by NextPipelinedWrite.
	set state(tmpConnArgs) [list $proto $phost $srvurl]
    }

    # The element socketWrState($connId) has a value which is either the name of
    # the token that is permitted to write to the socket, or "Wready" if no
    # token is permitted to write.
    #
    # The code that sets the value to Wready immediately calls
    # http::NextPipelinedWrite, which examines socketWrQueue($connId) and
    # processes the next request in the queue, if there is one.  The value
    # Wready is not found when the interpreter is in the event loop unless the
    # socket is idle.
    #
    # The element socketRdState($connId) has a value which is either the name of
    # the token that is permitted to read from the socket, or "Rready" if no
    # token is permitted to read.
    #
    # The code that sets the value to Rready then examines
    # socketRdQueue($connId) and processes the next request in the queue, if
    # there is one.  The value Rready is not found when the interpreter is in
    # the event loop unless the socket is idle.

    if {$alreadyQueued} {
	# A write may or may not be in progress.  There is no need to set
	# socketWrState to prevent another call stealing write access - all
	# subsequent calls on this socket will come here because the socket
	# will close after the current read, and its
	# socketClosing($connId) is 1.
	##Log "HTTP request for token $token is queued"

    } elseif {    $reusing
	       && $state(-pipeline)
	       && ($socketWrState($state(socketinfo)) ne "Wready")
    } {
	##Log "HTTP request for token $token is queued for pipelined use"
	lappend socketWrQueue($state(socketinfo)) $token

    } elseif {    $reusing
	       && (!$state(-pipeline))
	       && ($socketWrState($state(socketinfo)) ne "Wready")
    } {
	# A write is queued or in progress.  Lappend to the write queue.
	##Log "HTTP request for token $token is queued for nonpipeline use"
	lappend socketWrQueue($state(socketinfo)) $token

    } elseif {    $reusing
	       && (!$state(-pipeline))
	       && ($socketWrState($state(socketinfo)) eq "Wready")
	       && ($socketRdState($state(socketinfo)) ne "Rready")
    } {
	# A read is queued or in progress, but not a write.  Cannot start the
	# nonpipeline transaction, but must set socketWrState to prevent a
	# pipelined request jumping the queue.
	##Log "HTTP request for token $token is queued for nonpipeline use"
	#Log re-use nonpipeline, GRANT delayed write access to $token in geturl

	set socketWrState($state(socketinfo)) peNding
	lappend socketWrQueue($state(socketinfo)) $token

    } else {
	if {$reusing && $state(-pipeline)} {
	    #Log re-use pipelined, GRANT write access to $token in geturl
	    set socketWrState($state(socketinfo)) $token

	} elseif {$reusing} {
	    # Cf tests above - both are ready.
	    #Log re-use nonpipeline, GRANT r/w access to $token in geturl
	    set socketRdState($state(socketinfo)) $token
	    set socketWrState($state(socketinfo)) $token
	}

	# All (!$reusing) cases come here, and also some $reusing cases if the
	# connection is ready.
	#Log ---- $state(socketinfo) << conn to $token for HTTP request (a)
	# Connect does its own fconfigure.
	fileevent $sock writable \
		[list http::Connect $token $proto $phost $srvurl]
    }

    # Wait for the connection to complete.
    if {![info exists state(-command)]} {
	# geturl does EVERYTHING asynchronously, so if the user
	# calls it synchronously, we just do a wait here.
	http::wait $token

	    # callback (if available) because we're going to throw an
	    # exception from here instead.
	    set err [lindex $state(error) 0]
	    cleanup $token
	    return -code error $err
	}
    }
    ##Log Leaving http::geturl - token $token
    return $token
}

# http::Connected --
#
#	Callback used when the connection to the HTTP server is actually
#	established.
#
# Arguments:
#	token	State token.
#	proto	What protocol (http, https, etc.) was used to connect.
#	phost	Are we using keep-alive? Non-empty if yes.
#	srvurl	Service-local URL that we're requesting
# Results:
#	None.

proc http::Connected {token proto phost srvurl} {
    variable http
    variable urlTypes
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]

    if {$state(reusing) && (!$state(-pipeline)) && ($state(-timeout) > 0)} {
	set state(after) [after $state(-timeout) \
		[list http::reset $token timeout]]
    }

    # Set back the variables needed here.
    set sock $state(sock)
    set isQueryChannel [info exists state(-querychannel)]
    set isQuery [info exists state(-query)]
    set host [lindex [split $state(socketinfo) :] 0]
    set port [lindex [split $state(socketinfo) :] 1]

    set lower [string tolower $proto]
    set defport [lindex $urlTypes($lower) 0]

    # Send data in cr-lf format, but accept any line terminators.
    # Initialisation to {auto *} now done in geturl, KeepSocket and DoneRequest.
    # We are concerned here with the request (write) not the response (read).
    lassign [fconfigure $sock -translation] trRead trWrite
    fconfigure $sock -translation [list $trRead crlf] \
		     -buffersize $state(-blocksize)

    # The following is disallowed in safe interpreters, but the socket is
    # already in non-blocking mode in that case.

    catch {fconfigure $sock -blocking off}
    set how GET
    if {$isQuery} {

	}
    } elseif {$state(-validate)} {
	set how HEAD
    } elseif {$isQueryChannel} {
	set how POST
	# The query channel must be blocking for the async Write to
	# work properly.
	lassign [fconfigure $sock -translation] trRead trWrite
	fconfigure $state(-querychannel) -blocking 1 \
					 -translation [list $trRead binary]
	set contDone 0
    }
    if {[info exists state(-method)] && ($state(-method) ne "")} {
	set how $state(-method)
    }
    # We cannot handle chunked encodings with -handler, so force HTTP/1.0
    # until we can manage this.
    if {[info exists state(-handler)]} {
	set state(-protocol) 1.0
    }
    set accept_types_seen 0

    Log ^B$tk begin sending request - token $token

    if {[catch {
	set state(method) $how
	puts $sock "$how $srvurl HTTP/$state(-protocol)"
	if {[dict exists $state(-headers) Host]} {
	    # Allow Host spoofing. [Bug 928154]
	    puts $sock "Host: [dict get $state(-headers) Host]"
	} elseif {$port == $defport} {
	    # Don't add port in this case, to handle broken servers. [Bug
	    # #504508]
	    puts $sock "Host: $host"
	} else {
	    puts $sock "Host: $host:$port"
	}
	puts $sock "User-Agent: $http(-useragent)"
	if {($state(-protocol) >= 1.0) && $state(-keepalive)} {
	    # Send this header, because a 1.1 server is not compelled to treat
	    # this as the default.
	    puts $sock "Connection: keep-alive"
	}
	if {($state(-protocol) > 1.0) && !$state(-keepalive)} {
	    puts $sock "Connection: close" ;# RFC2616 sec 8.1.2.1
	}
	if {[info exists phost] && ($phost ne "") && $state(-keepalive)} {
	    puts $sock "Proxy-Connection: Keep-Alive"
	}
	set accept_encoding_seen 0
	set content_type_seen 0
	dict for {key value} $state(-headers) {
	    set value [string map [list \n "" \r ""] $value]
	    set key [string map {" " -} [string trim $key]]
	    if {[string equal -nocase $key "host"]} {
		continue
	    }

	    }
	}
	# Allow overriding the Accept header on a per-connection basis. Useful
	# for working with REST services. [Bug c11a51c482]
	if {!$accept_types_seen} {
	    puts $sock "Accept: $state(accept-types)"
	}
	if {    (!$accept_encoding_seen)
	     && (![info exists state(-handler)])
	     && $http(-zip)
	} {
	    puts $sock "Accept-Encoding: gzip,deflate,compress"
	}
	if {$isQueryChannel && ($state(querylength) == 0)} {
	    # Try to determine size of data in channel. If we cannot seek, the
	    # surrounding catch will trap us

	    set start [tell $state(-querychannel)]
	    seek $state(-querychannel) 0 end
	    set state(querylength) \
		    [expr {[tell $state(-querychannel)] - $start}]

	# data. Having both fileevents active changes the timing and the
	# behavior, but no two platforms (among Solaris, Linux, and NT) behave
	# the same, and none behave all that well in any case. Servers should
	# always read their POST data if they expect the client to read their
	# response.

	if {$isQuery || $isQueryChannel} {
	    # POST method.
	    if {!$content_type_seen} {
		puts $sock "Content-Type: $state(-type)"
	    }
	    if {!$contDone} {
		puts $sock "Content-Length: $state(querylength)"
	    }
	    puts $sock ""
	    flush $sock
	    # Flush flushes the error in the https case with a bad handshake:
	    # else the socket never becomes writable again, and hangs until
	    # timeout (if any).

	    lassign [fconfigure $sock -translation] trRead trWrite
	    fconfigure $sock -translation [list $trRead binary]
	    fileevent $sock writable [list http::Write $token]
	    # The http::Write command decides when to make the socket readable,
	    # using the same test as the GET/HEAD case below.
	} else {
	    # GET or HEAD method.
	    if {    (![catch {fileevent $sock readable} binding])
		 && ($binding eq [list http::CheckEof $sock])
	    } {
		# Remove the "fileevent readable" binding of an idle persistent
		# socket to http::CheckEof.  We can no longer treat bytes
		# received as junk. The server might still time out and
		# half-close the socket if it has not yet received the first
		# "puts".
		fileevent $sock readable {}
	    }
	    puts $sock ""
	    flush $sock
	    Log ^C$tk end sending request - token $token
	    # End of writing (GET/HEAD methods).  The request has been sent.

	    DoneRequest $token
	}

    } err]} {
	# The socket probably was never connected, OR the connection dropped
	# later, OR https handshake error, which may be discovered as late as
	# the "flush" command above...
	Log "WARNING - if testing, pay special attention to this\
		case (GI) which is seldom executed - token $token"
	if {[info exists state(reusing)] && $state(reusing)} {
	    # The socket was closed at the server end, and closed at
	    # this end by http::CheckEof.
    	    if {[TestForReplay $token write $err a]} {
		return
	    } else {
		Finish $token {failed to re-use socket}
	    }

	    # else:
	    # This is NOT a persistent socket that has been closed since its
	    # last use.
	    # If any other requests are in flight or pipelined/queued, they will
	    # be discarded.
	} elseif {$state(status) eq ""} {
	    # ...https handshake errors come here.
	    set msg [registerError $sock]
	    registerError $sock {}
	    if {$msg eq {}} {
		set msg {failed to use socket}
	    }
	    Finish $token $msg
	} elseif {$state(status) ne "error"} {
	    Finish $token $err
	}
    }
}

# http::registerError
#
#	Called (for example when processing TclTLS activity) to register
#	an error for a connection on a specific socket.  This helps
#	http::Connected to deliver meaningful error messages, e.g. when a TLS
#	certificate fails verification.
#
#	Usage: http::registerError socket ?newValue?
#
#	"set" semantics, except that a "get" (a call without a new value) for a
#	non-existent socket returns {}, not an error.

proc http::registerError {sock args} {
    variable registeredErrors

    if {    ([llength $args] == 0)
	 && (![info exists registeredErrors($sock)])
    } {
	return
    } elseif {    ([llength $args] == 1)
	       && ([lindex $args 0] eq {})
    } {
	unset -nocomplain registeredErrors($sock)
	return
    }
    set registeredErrors($sock) {*}$args
}

# http::DoneRequest --
#
#	Command called when a request has been sent.  It will arrange the
#	next request and/or response as appropriate.
#
#	If this command is called when $socketClosing(*), the request $token
#	that calls it must be pipelined and destined to fail.

proc http::DoneRequest {token} {
    variable http
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    set sock $state(sock)

    # If pipelined, connect the next HTTP request to the socket.
    if {$state(reusing) && $state(-pipeline)} {
	# Enable next token (if any) to write.
	# The value "Wready" is set only here, and
	# in http::Event after reading the response-headers of a
	# non-reusing transaction.
	# Previous value is $token. It cannot be pending.
	set socketWrState($state(socketinfo)) Wready

	# Now ready to write the next pipelined request (if any).
	http::NextPipelinedWrite $token
    } else {
	# If pipelined, this is the first transaction on this socket.  We wait
	# for the response headers to discover whether the connection is
	# persistent.  (If this is not done and the connection is not
	# persistent, we SHOULD retry and then MUST NOT pipeline before knowing
	# that we have a persistent connection
	# (rfc2616 8.1.2.2)).
    }

    # Connect to receive the response, unless the socket is pipelined
    # and another response is being sent.
    # This code block is separate from the code below because there are
    # cases where socketRdState already has the value $token.
    if {    $state(-keepalive)
	 && $state(-pipeline)
	 && [info exists socketRdState($state(socketinfo))]
	 && ($socketRdState($state(socketinfo)) eq "Rready")
    } {
	#Log pipelined, GRANT read access to $token in Connected
	set socketRdState($state(socketinfo)) $token
    }

    if {    $state(-keepalive)
	 && $state(-pipeline)
	 && [info exists socketRdState($state(socketinfo))]
	 && ($socketRdState($state(socketinfo)) ne $token)
    } {
	# Do not read from the socket until it is ready.
	##Log "HTTP response for token $token is queued for pipelined use"
	# If $socketClosing(*), then the caller will be a pipelined write and
	# execution will come here.
	# This token has already been recorded as "in flight" for writing.
	# When the socket is closed, the read queue will be cleared in
	# CloseQueuedQueries and so the "lappend" here has no effect.
	lappend socketRdQueue($state(socketinfo)) $token
    } else {
	# In the pipelined case, connection for reading depends on the
	# value of socketRdState.
	# In the nonpipeline case, connection for reading always occurs.
	ReceiveResponse $token
    }
}

# http::ReceiveResponse
#
#	Connects token to its socket for reading.

proc http::ReceiveResponse {token} {
    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    set sock $state(sock)

    #Log ---- $state(socketinfo) >> conn to $token for HTTP response
    lassign [fconfigure $sock -translation] trRead trWrite
    fconfigure $sock -translation [list auto $trWrite] \
		     -buffersize $state(-blocksize)
    Log ^D$tk begin receiving response - token $token

    coroutine ${token}EventCoroutine http::Event $sock $token
    fileevent $sock readable ${token}EventCoroutine
}

# http::NextPipelinedWrite
#
# - Connecting a socket to a token for writing is done by this command and by
#   command KeepSocket.
# - If another request has a pipelined write scheduled for $token's socket,
#   and if the socket is ready to accept it, connect the write and update
#   the queue accordingly.
# - This command is called from http::DoneRequest and http::Event,
#   IF $state(-pipeline) AND (the current transfer has reached the point at
#   which the socket is ready for the next request to be written).
# - This command is called when a token has write access and is pipelined and
#   keep-alive, and sets socketWrState to Wready.
# - The command need not consider the case where socketWrState is set to a token
#   that does not yet have write access.  Such a token is waiting for Rready,
#   and the assignment of the connection to the token will be done elsewhere (in
#   http::KeepSocket).
# - This command cannot be called after socketWrState has been set to a
#   "pending" token value (that is then overwritten by the caller), because that
#   value is set by this command when it is called by an earlier token when it
#   relinquishes its write access, and the pending token is always the next in
#   line to write.

proc http::NextPipelinedWrite {token} {
    variable http
    variable socketRdState
    variable socketWrState
    variable socketWrQueue
    variable socketClosing
    variable $token
    upvar 0 $token state
    set connId $state(socketinfo)

    if {    [info exists socketClosing($connId)]
	 && $socketClosing($connId)
    } {
	# socketClosing(*) is set because the server has sent a
	# "Connection: close" header.
	# Behave as if the queues are empty - so do nothing.
    } elseif {    $state(-pipeline)
	 && [info exists socketWrState($connId)]
	 && ($socketWrState($connId) eq "Wready")

	 && [info exists socketWrQueue($connId)]
	 && [llength $socketWrQueue($connId)]
	 && ([set token2 [lindex $socketWrQueue($connId) 0]
	      set ${token2}(-pipeline)
	     ]
	    )
    } {
	# - The usual case for a pipelined connection, ready for a new request.
	#Log pipelined, GRANT write access to $token2 in NextPipelinedWrite
	set conn [set ${token2}(tmpConnArgs)]
	set socketWrState($connId) $token2
	set socketWrQueue($connId) [lrange $socketWrQueue($connId) 1 end]
	# Connect does its own fconfigure.
	fileevent $state(sock) writable [list http::Connect $token2 {*}$conn]
	#Log ---- $connId << conn to $token2 for HTTP request (b)

	# In the tests below, the next request will be nonpipeline.
    } elseif {    $state(-pipeline)
	       && [info exists socketWrState($connId)]
	       && ($socketWrState($connId) eq "Wready")

	       && [info exists socketWrQueue($connId)]
	       && [llength $socketWrQueue($connId)]
	       && (![ set token3 [lindex $socketWrQueue($connId) 0]
		      set ${token3}(-pipeline)
		    ]
		  )

	       && [info exists socketRdState($connId)]
	       && ($socketRdState($connId) eq "Rready")
    } {
	# The case in which the next request will be non-pipelined, and the read
	# and write queues is ready: which is the condition for a non-pipelined
	# write.
	variable $token3
	upvar 0 $token3 state3
	set conn [set ${token3}(tmpConnArgs)]
	#Log nonpipeline, GRANT r/w access to $token3 in NextPipelinedWrite
	set socketRdState($connId) $token3
	set socketWrState($connId) $token3
	set socketWrQueue($connId) [lrange $socketWrQueue($connId) 1 end]
	# Connect does its own fconfigure.
	fileevent $state(sock) writable [list http::Connect $token3 {*}$conn]
	#Log ---- $state(sock) << conn to $token3 for HTTP request (c)

    } elseif {    $state(-pipeline)
	 && [info exists socketWrState($connId)]
	 && ($socketWrState($connId) eq "Wready")

	 && [info exists socketWrQueue($connId)]
	 && [llength $socketWrQueue($connId)]
	 && (![set token2 [lindex $socketWrQueue($connId) 0]
	      set ${token2}(-pipeline)
	     ]
	    )
    } {
	# - The case in which the next request will be non-pipelined, but the
	#   read queue is NOT ready.
	# - A read is queued or in progress, but not a write.  Cannot start the
	#   nonpipeline transaction, but must set socketWrState to prevent a new
	#   pipelined request (in http::geturl) jumping the queue.
	# - Because socketWrState($connId) is not set to Wready, the assignment
	#   of the connection to $token2 will be done elsewhere - by command
	#   http::KeepSocket when $socketRdState($connId) is set to "Rready".

	#Log re-use nonpipeline, GRANT delayed write access to $token in NextP..
	set socketWrState($connId) peNding
    }
}

# http::CancelReadPipeline
#
#	Cancel pipelined responses on a closing "Keep-Alive" socket.
#
#	- Called by a variable trace on "unset socketRdState($connId)".
#	- The variable relates to a Keep-Alive socket, which has been closed.
#	- Cancels all pipelined responses. The requests have been sent,
#	  the responses have not yet been received.
#	- This is a hard cancel that ends each transaction with error status,
#	  and closes the connection. Do not use it if you want to replay failed
#	  transactions.
#	- N.B. Always delete ::http::socketRdState($connId) before deleting
#	  ::http::socketRdQueue($connId), or this command will do nothing.
#
# Arguments
#	As for a trace command on a variable.

proc http::CancelReadPipeline {name1 connId op} {
    variable socketRdQueue
    ##Log CancelReadPipeline $name1 $connId $op
    if {[info exists socketRdQueue($connId)]} {
	set msg {the connection was closed by CancelReadPipeline}
	foreach token $socketRdQueue($connId) {
	    set tk [namespace tail $token]
	    Log ^X$tk end of response "($msg)" - token $token
	    set ${token}(status) eof
	    Finish $token ;#$msg
	}
	set socketRdQueue($connId) {}
    }
}

# http::CancelWritePipeline
#
#	Cancel queued events on a closing "Keep-Alive" socket.
#
#	- Called by a variable trace on "unset socketWrState($connId)".
#	- The variable relates to a Keep-Alive socket, which has been closed.
#	- In pipelined or nonpipeline case: cancels all queued requests.  The
#	  requests have not yet been sent, the responses are not due.
#	- This is a hard cancel that ends each transaction with error status,
#	  and closes the connection. Do not use it if you want to replay failed
#	  transactions.
#	- N.B. Always delete ::http::socketWrState($connId) before deleting
#	  ::http::socketWrQueue($connId), or this command will do nothing.
#
# Arguments
#	As for a trace command on a variable.

proc http::CancelWritePipeline {name1 connId op} {
    variable socketWrQueue

    ##Log CancelWritePipeline $name1 $connId $op
    if {[info exists socketWrQueue($connId)]} {
	set msg {the connection was closed by CancelWritePipeline}
	foreach token $socketWrQueue($connId) {
	    set tk [namespace tail $token]
	    Log ^X$tk end of response "($msg)" - token $token
	    set ${token}(status) eof
	    Finish $token ;#$msg
	}
	set socketWrQueue($connId) {}
    }
}

# http::ReplayIfDead --
#
# - A query on a re-used persistent socket failed at the earliest opportunity,
#   because the socket had been closed by the server.  Keep the token, tidy up,
#   and try to connect on a fresh socket.
# - The connection is monitored for eof by the command http::CheckEof.  Thus
#   http::ReplayIfDead is needed only when a server event (half-closing an
#   apparently idle connection), and a client event (sending a request) occur at
#   almost the same time, and neither client nor server detects the other's
#   action before performing its own (an "asynchronous close event").
# - To simplify testing of http::ReplayIfDead, set TEST_EOF 1 in
#   http::KeepSocket, and then http::ReplayIfDead will be called if http::geturl
#   is called at any time after the server timeout.
#
# Arguments:
#	token	Connection token.
#
# Side Effects:
#	Use the same token, but try to open a new socket.

proc http::ReplayIfDead {tokenArg doing} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $tokenArg
    upvar 0 $tokenArg stateArg

    Log running http::ReplayIfDead for $tokenArg $doing

    # 1. Merge the tokens for transactions in flight, the read (response) queue,
    #    and the write (request) queue.

    set InFlightR {}
    set InFlightW {}

    # Obtain the tokens for transactions in flight.
    if {$stateArg(-pipeline)} {
	# Two transactions may be in flight.  The "read" transaction was first.
	# It is unlikely that the server would close the socket if a response
	# was pending; however, an earlier request (as well as the present
	# request) may have been sent and ignored if the socket was half-closed
	# by the server.

	if {    [info exists socketRdState($stateArg(socketinfo))]
	     && ($socketRdState($stateArg(socketinfo)) ne "Rready")
	} {
	    lappend InFlightR $socketRdState($stateArg(socketinfo))
	} elseif {($doing eq "read")} {
	    lappend InFlightR $tokenArg
	}

	if {    [info exists socketWrState($stateArg(socketinfo))]
	     && $socketWrState($stateArg(socketinfo)) ni {Wready peNding}
	} {
	    lappend InFlightW $socketWrState($stateArg(socketinfo))
	} elseif {($doing eq "write")} {
	    lappend InFlightW $tokenArg
	}

	# Report any inconsistency of $tokenArg with socket*state.
	if {    ($doing eq "read")
	     && [info exists socketRdState($stateArg(socketinfo))]
	     && ($tokenArg ne $socketRdState($stateArg(socketinfo)))
	} {
	    Log WARNING - ReplayIfDead pipelined tokenArg $tokenArg $doing \
		    ne socketRdState($stateArg(socketinfo)) \
		      $socketRdState($stateArg(socketinfo))

	} elseif {
		($doing eq "write")
	     && [info exists socketWrState($stateArg(socketinfo))]
	     && ($tokenArg ne $socketWrState($stateArg(socketinfo)))
	} {
	    Log WARNING - ReplayIfDead pipelined tokenArg $tokenArg $doing \
		    ne socketWrState($stateArg(socketinfo)) \
		      $socketWrState($stateArg(socketinfo))
	}
    } else {
	# One transaction should be in flight.
	# socketRdState, socketWrQueue are used.
	# socketRdQueue should be empty.

	# Report any inconsistency of $tokenArg with socket*state.
	if {$tokenArg ne $socketRdState($stateArg(socketinfo))} {
	    Log WARNING - ReplayIfDead nonpipeline tokenArg $tokenArg $doing \
		    ne socketRdState($stateArg(socketinfo)) \
		      $socketRdState($stateArg(socketinfo))
	}

	# Report the inconsistency that socketRdQueue is non-empty.
	if {    [info exists socketRdQueue($stateArg(socketinfo))]
	     && ($socketRdQueue($stateArg(socketinfo)) ne {})
	} {
	    Log WARNING - ReplayIfDead nonpipeline tokenArg $tokenArg $doing \
		    has read queue socketRdQueue($stateArg(socketinfo)) \
		    $socketRdQueue($stateArg(socketinfo)) ne {}
	}

	lappend InFlightW $socketRdState($stateArg(socketinfo))
	set socketRdQueue($stateArg(socketinfo)) {}
    }

    set newQueue {}
    lappend newQueue {*}$InFlightR
    lappend newQueue {*}$socketRdQueue($stateArg(socketinfo))
    lappend newQueue {*}$InFlightW
    lappend newQueue {*}$socketWrQueue($stateArg(socketinfo))


    # 2. Tidy up tokenArg.  This is a cut-down form of Finish/CloseSocket.
    #    Do not change state(status).
    #    No need to after cancel stateArg(after) - either this is done in
    #    ReplayCore/ReInit, or Finish is called.

    catch {close $stateArg(sock)}

    # 2a. Tidy the tokens in the queues - this is done in ReplayCore/ReInit.
    # - Transactions, if any, that are awaiting responses cannot be completed.
    #   They are listed for re-sending in newQueue.
    # - All tokens are preserved for re-use by ReplayCore, and their variables
    #   will be re-initialised by calls to ReInit.
    # - The relevant element of socketMapping, socketRdState, socketWrState,
    #   socketRdQueue, socketWrQueue, socketClosing, socketPlayCmd will be set
    #   to new values in ReplayCore.

    ReplayCore $newQueue
}

# http::ReplayIfClose --
#
#	A request on a socket that was previously "Connection: keep-alive" has
#	received a "Connection: close" response header.  The server supplies
#	that response correctly, but any later requests already queued on this
#	connection will be lost when the socket closes.
#
#	This command takes arguments that represent the socketWrState,
#	socketRdQueue and socketWrQueue for this connection.  The socketRdState
#	is not needed because the server responds in full to the request that
#	received the "Connection: close" response header.
#
#	Existing request tokens $token (::http::$n) are preserved.  The caller
#	will be unaware that the request was processed this way.

proc http::ReplayIfClose {Wstate Rqueue Wqueue} {
    Log running http::ReplayIfClose for $Wstate $Rqueue $Wqueue

    if {$Wstate in $Rqueue || $Wstate in $Wqueue} {
	Log WARNING duplicate token in http::ReplayIfClose - token $Wstate
	set Wstate Wready
    }

    # 1. Create newQueue
    set InFlightW {}
    if {$Wstate ni {Wready peNding}} {
	lappend InFlightW $Wstate
    }

    set newQueue {}
    lappend newQueue {*}$Rqueue
    lappend newQueue {*}$InFlightW
    lappend newQueue {*}$Wqueue

    # 2. Cleanup - none needed, done by the caller.

    ReplayCore $newQueue
}

# http::ReInit --
#
#	Command to restore a token's state to a condition that
#	makes it ready to replay a request.
#
#	Command http::geturl stores extra state in state(tmp*) so
#	we don't need to do the argument processing again.
#
#	The caller must:
#	- Set state(reusing) and state(sock) to their new values after calling
#	  this command.
#	- Unset state(tmpState), state(tmpOpenCmd) if future calls to ReplayCore
#	  or ReInit are inappropriate for this token. Typically only one retry
#	  is allowed.
#	The caller may also unset state(tmpConnArgs) if this value (and the
#	token) will be used immediately.  The value is needed by tokens that
#	will be stored in a queue.
#
# Arguments:
#	token	Connection token.
#
# Return Value: (boolean) true iff the re-initialisation was successful.

proc http::ReInit {token} {
    variable $token
    upvar 0 $token state

    if {!(
	      [info exists state(tmpState)]
	   && [info exists state(tmpOpenCmd)]
	   && [info exists state(tmpConnArgs)]
	 )
    } {
	Log FAILED in http::ReInit via ReplayCore - NO tmp vars for $token
	return 0
    }

    if {[info exists state(after)]} {
	after cancel $state(after)
	unset state(after)
    }

    # Don't alter state(status) - this would trigger http::wait if it is in use.
    set tmpState    $state(tmpState)
    set tmpOpenCmd  $state(tmpOpenCmd)
    set tmpConnArgs $state(tmpConnArgs)
    foreach name [array names state] {
	if {$name ne "status"} {
	    unset state($name)
	}
    }

    # Don't alter state(status).
    # Restore state(tmp*) - the caller may decide to unset them.
    # Restore state(tmpConnArgs) which is needed for connection.
    # state(tmpState), state(tmpOpenCmd) are needed only for retries.

    dict unset tmpState status
    array set state $tmpState
    set state(tmpState)    $tmpState
    set state(tmpOpenCmd)  $tmpOpenCmd
    set state(tmpConnArgs) $tmpConnArgs

    return 1
}

# http::ReplayCore --
#
#	Command to replay a list of requests, using existing connection tokens.
#
#	Abstracted from http::geturl which stores extra state in state(tmp*) so
#	we don't need to do the argument processing again.
#
# Arguments:
#	newQueue	List of connection tokens.
#
# Side Effects:
#	Use existing tokens, but try to open a new socket.

proc http::ReplayCore {newQueue} {
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    if {[llength $newQueue] == 0} {
	# Nothing to do.
	return
    }

    ##Log running ReplayCore for {*}$newQueue
    set newToken [lindex $newQueue 0]
    set newQueue [lrange $newQueue 1 end]

    # 3. Use newToken, and restore its values of state(*).  Do not restore
    #    elements tmp* - we try again only once.

    set token $newToken
    variable $token
    upvar 0 $token state

    if {![ReInit $token]} {
	Log FAILED in http::ReplayCore - NO tmp vars
	Finish $token {cannot send this request again}
	return
    }

    set tmpState    $state(tmpState)
    set tmpOpenCmd  $state(tmpOpenCmd)
    set tmpConnArgs $state(tmpConnArgs)
    unset state(tmpState)
    unset state(tmpOpenCmd)
    unset state(tmpConnArgs)

    set state(reusing) 0

    if {$state(-timeout) > 0} {
	set resetCmd [list http::reset $token timeout]
	set state(after) [after $state(-timeout) $resetCmd]
    }

    set pre [clock milliseconds]
    ##Log pre socket opened, - token $token
    ##Log $tmpOpenCmd - token $token
    # 4. Open a socket.
    if {[catch {eval $tmpOpenCmd} sock]} {
	# Something went wrong while trying to establish the connection.
	Log FAILED - $sock
	set state(sock) NONE
	Finish $token $sock
	return
    }
    ##Log post socket opened, - token $token
    set delay [expr {[clock milliseconds] - $pre}]
    if {$delay > 3000} {
	Log socket delay $delay - token $token
    }
    # Command [socket] is called with -async, but takes 5s to 5.1s to return,
    # with probability of order 1 in 10,000.  This may be a bizarre scheduling
    # issue with my (KJN's) system (Fedora Linux).
    # This does not cause a problem (unless the request times out when this
    # command returns).

    # 5. Configure the persistent socket data.
    if {$state(-keepalive)} {
	set socketMapping($state(socketinfo)) $sock

	if {![info exists socketRdState($state(socketinfo))]} {
	    set socketRdState($state(socketinfo)) {}
	    set varName ::http::socketRdState($state(socketinfo))
	    trace add variable $varName unset ::http::CancelReadPipeline
	}

	if {![info exists socketWrState($state(socketinfo))]} {
	    set socketWrState($state(socketinfo)) {}
	    set varName ::http::socketWrState($state(socketinfo))
	    trace add variable $varName unset ::http::CancelWritePipeline
	}

	if {$state(-pipeline)} {
	    #Log new, init for pipelined, GRANT write acc to $token ReplayCore
	    set socketRdState($state(socketinfo)) $token
	    set socketWrState($state(socketinfo)) $token
	} else {
	    #Log new, init for nonpipeline, GRANT r/w acc to $token ReplayCore
	    set socketRdState($state(socketinfo)) $token
	    set socketWrState($state(socketinfo)) $token
	}

	set socketRdQueue($state(socketinfo)) {}
	set socketWrQueue($state(socketinfo)) $newQueue
	set socketClosing($state(socketinfo)) 0
	set socketPlayCmd($state(socketinfo)) {ReplayIfClose Wready {} {}}
    }

    ##Log pre newQueue ReInit, - token $token
    # 6. Configure sockets in the queue.
    foreach tok $newQueue {
	if {[ReInit $tok]} {
	    set ${tok}(reusing) 1
	    set ${tok}(sock) $sock
	} else {
	    set ${tok}(reusing) 1
	    set ${tok}(sock) NONE
	    Finish $token {cannot send this request again}
	}
    }

    # 7. Configure the socket for newToken to send a request.
    set state(sock) $sock
    Log "Using $sock for $state(socketinfo) - token $token" \
	[expr {$state(-keepalive)?"keepalive":""}]

    # Initialisation of a new socket.
    ##Log socket opened, now fconfigure - token $token
    fconfigure $sock -translation {auto crlf} -buffersize $state(-blocksize)
    ##Log socket opened, DONE fconfigure - token $token

    # Connect does its own fconfigure.
    fileevent $sock writable [list http::Connect $token {*}$tmpConnArgs]
    #Log ---- $sock << conn to $token for HTTP request (e)
}

# Data access functions:
# Data - the URL data
# Status - the transaction status: ok, reset, eof, timeout, error
# Code - the HTTP transaction code, e.g., 200
# Size - the size of the URL data

proc http::data {token} {
    variable $token
    upvar 0 $token state
    return $state(body)

#
# Side Effects
#	unsets the state array

proc http::cleanup {token} {
    variable $token
    upvar 0 $token state
    if {[info commands ${token}EventCoroutine] ne {}} {
	rename ${token}EventCoroutine {}
    }
    if {[info exists state(after)]} {
	after cancel $state(after)
	unset state(after)
    }
    if {[info exists state]} {
	unset state
    }
}

# http::Connect
#
#	This callback is made when an asyncronous connection completes.
#
# Arguments
#	token	The token returned from http::geturl
#
# Side Effects
#	Sets the status of the connection, which unblocks
# 	the waiting geturl call

proc http::Connect {token proto phost srvurl} {
    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    set err "due to unexpected EOF"
    if {
	[eof $state(sock)] ||
	[set err [fconfigure $state(sock) -error]] ne ""
    } {
	Log "WARNING - if testing, pay special attention to this\
		case (GJ) which is seldom executed - token $token"
	if {[info exists state(reusing)] && $state(reusing)} {
	    # The socket was closed at the server end, and closed at
	    # this end by http::CheckEof.
	    if {[TestForReplay $token write $err b]} {
		return
	    }

	    # else:
	    # This is NOT a persistent socket that has been closed since its
	    # last use.
	    # If any other requests are in flight or pipelined/queued, they will
	    # be discarded.
	}
	Finish $token "connect failed $err"
    } else {
	set state(state) connecting
	fileevent $state(sock) writable {}
	::http::Connected $token $proto $phost $srvurl
    }

}

# http::Write
#
#	Write POST query data to the socket
#
# Arguments
#	token	The token for the connection
#
# Side Effects
#	Write the socket and handle callbacks.

proc http::Write {token} {
    variable http
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    set sock $state(sock)

    # Output a block.  Tcl will buffer this if the socket blocks
    set done 0
    if {[catch {
	# Catch I/O errors on dead sockets

	if {[info exists state(-query)]} {
	    # Chop up large query strings so queryprogress callback can give
	    # smooth feedback.
	    if {    $state(queryoffset) + $state(-queryblocksize)
		 >= $state(querylength)
	    } {
		# This will be the last puts for the request-body.
		if {    (![catch {fileevent $sock readable} binding])
		     && ($binding eq [list http::CheckEof $sock])
		} {
		    # Remove the "fileevent readable" binding of an idle
		    # persistent socket to http::CheckEof.  We can no longer
		    # treat bytes received as junk. The server might still time
		    # out and half-close the socket if it has not yet received
		    # the first "puts".
		    fileevent $sock readable {}
		}
	    }
	    puts -nonewline $sock \
		[string range $state(-query) $state(queryoffset) \
		     [expr {$state(queryoffset) + $state(-queryblocksize) - 1}]]
	    incr state(queryoffset) $state(-queryblocksize)
	    if {$state(queryoffset) >= $state(querylength)} {
		set state(queryoffset) $state(querylength)
		set done 1
	    }
	} else {
	    # Copy blocks from the query channel

	    set outStr [read $state(-querychannel) $state(-queryblocksize)]
	    if {[eof $state(-querychannel)]} {
		# This will be the last puts for the request-body.
		if {    (![catch {fileevent $sock readable} binding])
		     && ($binding eq [list http::CheckEof $sock])
		} {
		    # Remove the "fileevent readable" binding of an idle
		    # persistent socket to http::CheckEof.  We can no longer
		    # treat bytes received as junk. The server might still time
		    # out and half-close the socket if it has not yet received
		    # the first "puts".
		    fileevent $sock readable {}
		}
	    }
	    puts -nonewline $sock $outStr
	    incr state(queryoffset) [string length $outStr]
	    if {[eof $state(-querychannel)]} {
		set done 1
	    }
	}
    } err]} {
	# Do not call Finish here, but instead let the read half of the socket
	# process whatever server reply there is to get.

	set state(posterror) $err
	set done 1
    }

    if {$done} {
	catch {flush $sock}
	fileevent $sock writable {}
	Log ^C$tk end sending request - token $token
	# End of writing (POST method).  The request has been sent.

	DoneRequest $token
    }

    # Callback to the client after we've completely handled everything.

    if {[string length $state(-queryprogress)]} {
	eval $state(-queryprogress) \
	    [list $token $state(querylength) $state(queryoffset)]
    }
}

# http::Event
#
#	Handle input on the socket. This command is the core of
#	the coroutine commands ${token}EventCoroutine that are
#	bound to "fileevent $sock readable" and process input.
#
# Arguments
#	sock	The socket receiving input.
#	token	The token returned from http::geturl
#
# Side Effects
#	Read the socket and handle callbacks.

proc http::Event {sock token} {
    variable http
    variable socketMapping
    variable socketRdState
    variable socketWrState
    variable socketRdQueue
    variable socketWrQueue
    variable socketClosing
    variable socketPlayCmd

    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    while 1 {
	yield
	##Log Event call - token $token

	if {![info exists state]} {
	    Log "Event $sock with invalid token '$token' - remote close?"
	    if {![eof $sock]} {
		if {[set d [read $sock]] ne ""} {
		    Log "WARNING: additional data left on closed socket\
			    - token $token"
		}
	    }
	    Log ^X$tk end of response (token error) - token $token
	    CloseSocket $sock
	    return
	}
	if {$state(state) eq "connecting"} {
	    ##Log - connecting - token $token
	    if {    $state(reusing)
		 && $state(-pipeline)
		 && ($state(-timeout) > 0)
		 && (![info exists state(after)])
	    } {
		set state(after) [after $state(-timeout) \
			[list http::reset $token timeout]]
	    }

	    if {[catch {gets $sock state(http)} nsl]} {
		Log "WARNING - if testing, pay special attention to this\
			case (GK) which is seldom executed - token $token"
		if {[info exists state(reusing)] && $state(reusing)} {
		    # The socket was closed at the server end, and closed at
		    # this end by http::CheckEof.

		    if {[TestForReplay $token read $nsl c]} {
			return
		    }

		    # else:
		    # This is NOT a persistent socket that has been closed since
		    # its last use.
		    # If any other requests are in flight or pipelined/queued,
		    # they will be discarded.
		} else {
		    Log ^X$tk end of response (error) - token $token
		    Finish $token $nsl
		    return
		}
	    } elseif {$nsl >= 0} {
		##Log - connecting 1 - token $token
		set state(state) "header"
	    } elseif {    [eof $sock]
		       && [info exists state(reusing)]
		       && $state(reusing)
	    } {
		# The socket was closed at the server end, and we didn't notice.
		# This is the first read - where the closure is usually first
		# detected.

		if {[TestForReplay $token read {} d]} {
		    return
		}

		# else:
		# This is NOT a persistent socket that has been closed since its
		# last use.
		# If any other requests are in flight or pipelined/queued, they
		# will be discarded.
	    }
	} elseif {$state(state) eq "header"} {
	    if {[catch {gets $sock line} nhl]} {
		##Log header failed - token $token
		Log ^X$tk end of response (error) - token $token
		Finish $token $nhl
		return
	    } elseif {$nhl == 0} {
		##Log header done - token $token
		Log ^E$tk end of response headers - token $token
		# We have now read all headers
		# We ignore HTTP/1.1 100 Continue returns. RFC2616 sec 8.2.3
		if {    ($state(http) == "")
		     || ([regexp {^\S+\s(\d+)} $state(http) {} x] && $x == 100)
		} {
		    set state(state) "connecting"
		    continue
		    # This was a "return" in the pre-coroutine code.
		}

		if {    ([info exists state(connection)])
		     && ([info exists socketMapping($state(socketinfo))])
		     && ($state(connection) eq "keep-alive")
		     && ($state(-keepalive))
		     && (!$state(reusing))
		     && ($state(-pipeline))
		} {
		    # Response headers received for first request on a
		    # persistent socket.  Now ready for pipelined writes (if
		    # any).
		    # Previous value is $token. It cannot be "pending".
		    set socketWrState($state(socketinfo)) Wready
		    http::NextPipelinedWrite $token
		}

		# Once a "close" has been signaled, the client MUST NOT send any
		# more requests on that connection.
		#
		# If either the client or the server sends the "close" token in
		# the Connection header, that request becomes the last one for
		# the connection.

		if {    ([info exists state(connection)])
		     && ([info exists socketMapping($state(socketinfo))])
		     && ($state(connection) eq "close")
		     && ($state(-keepalive))
		} {
		    # The server warns that it will close the socket after this
		    # response.
		    ##Log WARNING - socket will close after response for $token
		    # Prepare data for a call to ReplayIfClose.
		    if {    ($socketRdQueue($state(socketinfo)) ne {})
			 || ($socketWrQueue($state(socketinfo)) ne {})
			 || ($socketWrState($state(socketinfo)) ni
						[list Wready peNding $token])
		    } {
			set InFlightW $socketWrState($state(socketinfo))
			if {$InFlightW in [list Wready peNding $token]} {
			    set InFlightW Wready
			} else {
			    set msg "token ${InFlightW} is InFlightW"
			    ##Log $msg - token $token
			}

			set socketPlayCmd($state(socketinfo)) \
				[list ReplayIfClose $InFlightW \
				$socketRdQueue($state(socketinfo)) \
				$socketWrQueue($state(socketinfo))]

			# - All tokens are preserved for re-use by ReplayCore.
			# - Queues are preserved in case of Finish with error,
			#   but are not used for anything else because
			#   socketClosing(*) is set below.
			# - Cancel the state(after) timeout events.
			foreach tokenVal $socketRdQueue($state(socketinfo)) {
			    if {[info exists ${tokenVal}(after)]} {
				after cancel [set ${tokenVal}(after)]
				unset ${tokenVal}(after)
			    }
			}

		    } else {
			set socketPlayCmd($state(socketinfo)) \
				{ReplayIfClose Wready {} {}}
		    }

		    # Do not allow further connections on this socket.
		    set socketClosing($state(socketinfo)) 1
		}

		set state(state) body

		# If doing a HEAD, then we won't get any body
		if {$state(-validate)} {
		    Log ^F$tk end of response for HEAD request - token $token
		    set state(state) complete
		    Eot $token
		    return
		}

		# - For non-chunked transfer we may have no body - in this case
		#   we may get no further file event if the connection doesn't
		#   close and no more data is sent. We can tell and must finish
		#   up now - not later - the alternative would be to wait until
		#   the server times out.
		# - In this case, the server has NOT told the client it will
		#   close the connection, AND it has NOT indicated the resource
		#   length EITHER by setting the Content-Length (totalsize) OR
		#   by using chunked Transfer-Encoding.
		# - Do not worry here about the case (Connection: close) because
		#   the server should close the connection.
		# - IF (NOT Connection: close) AND (NOT chunked encoding) AND
		#      (totalsize == 0).

		if {    (!(    [info exists state(connection)]
			    && ($state(connection) eq "close")
			  )
			)
		     && (![info exists state(transfer)])
		     && ($state(totalsize) == 0)
		} {
		    set msg {body size is 0 and no events likely - complete}
		    Log "$msg - token $token"
		    set msg {(length unknown, set to 0)}
		    Log ^F$tk end of response body {*}$msg - token $token
		    set state(state) complete
		    Eot $token
		    return
		}

		# We have to use binary translation to count bytes properly.
		lassign [fconfigure $sock -translation] trRead trWrite
		fconfigure $sock -translation [list binary $trWrite]

		if {
		    $state(-binary) || [IsBinaryContentType $state(type)]
		} {
		    # Turn off conversions for non-text data.
		    set state(binary) 1
		}
		if {[info exists state(-channel)]} {
		    if {$state(binary) || [llength [ContentEncoding $token]]} {
			fconfigure $state(-channel) -translation binary
		    }
		    if {![info exists state(-handler)]} {
			# Initiate a sequence of background fcopies.
			fileevent $sock readable {}
			rename ${token}EventCoroutine {}
			CopyStart $sock $token
			return
		    }
		}
	    } elseif {$nhl > 0} {
		# Process header lines.
		##Log header - token $token - $line
		if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} {
		    switch -- [string tolower $key] {
			content-type {
			    set state(type) [string trim [string tolower $value]]
			    # Grab the optional charset information.
			    if {[regexp -nocase \
				    {charset\s*=\s*\"((?:[^""]|\\\")*)\"} \
				    $state(type) -> cs]} {
				set state(charset) [string map {{\"} \"} $cs]
			    } else {
				regexp -nocase {charset\s*=\s*(\S+?);?} \
					$state(type) -> state(charset)
			    }
			}
			content-length {
			    set state(totalsize) [string trim $value]
			}
			content-encoding {
			    set state(coding) [string trim $value]
			}
			transfer-encoding {
			    set state(transfer) \
				    [string trim [string tolower $value]]
			}
			proxy-connection -
			connection {
			    set state(connection) \
				    [string trim [string tolower $value]]
			}
		    }
		    lappend state(meta) $key [string trim $value]
		}
	    }
	} else {
	    # Now reading body
	    ##Log body - token $token
	    if {[catch {
		if {[info exists state(-handler)]} {
		    set n [eval $state(-handler) [list $sock $token]]
		    ##Log handler $n - token $token
		    # N.B. the protocol has been set to 1.0 because the -handler
		    # logic is not expected to handle chunked encoding.
		    # FIXME Allow -handler with 1.1 on dechunked stacked chan.
		    if {$state(totalsize) == 0} {
			# We know the transfer is complete only when the server
			# closes the connection - i.e. eof is not an error.
			set state(state) complete
		    }
		    if {![string is integer -strict $n]} {
			if 1 {

			    # Do not tolerate bad -handler - fail with error
			    # status.
			    set msg {the -handler command for http::geturl must\
				    return an integer (the number of bytes\
				    read)}
			    Log ^X$tk end of response (handler error) -\
				    token $token
			    Eot $token $msg
			} else {
			    # Tolerate the bad -handler, and continue.  The
			    # penalty:
			    # (a) Because the handler returns nonsense, we know
			    #     the transfer is complete only when the server
			    #     closes the connection - i.e. eof is not an

			    #     error.
			    # (b) http::size will not be accurate.
			    # (c) The transaction is already downgraded to 1.0
			    #     to avoid chunked transfer encoding.  It MUST
			    #     also be forced to "Connection: close" or the
			    #     HTTP/1.0 equivalent; or it MUST fail (as
			    #     above) if the server sends
			    #     "Connection: keep-alive" or the HTTP/1.0
			    #     equivalent.
			    set n 0
			    set state(state) complete
			}
		    }
		} elseif {[info exists state(transfer_final)]} {
		    # This code forgives EOF in place of the final CRLF.
		    set line [getTextLine $sock]
		    set n [string length $line]
		    set state(state) complete
		    if {$n > 0} {
			# - HTTP trailers (late response headers) are permitted
			#   by Chunked Transfer-Encoding, and can be safely
			#   ignored.
			# - Do not count these bytes in the total received for
			#   the response body.
			Log "trailer of $n bytes after final chunk -\
				token $token"
			append state(transfer_final) $line
			set n 0
		    } else {
			Log ^F$tk end of response body (chunked) - token $token
			Log "final chunk part - token $token"
			Eot $token
		    }
		} elseif {    [info exists state(transfer)]
			   && ($state(transfer) eq "chunked")
		} {
		    ##Log chunked - token $token
		    set size 0
		    set hexLenChunk [getTextLine $sock]
		    #set ntl [string length $hexLenChunk]
		    if {[string trim $hexLenChunk] ne ""} {
			scan $hexLenChunk %x size
			if {$size != 0} {

			    ##Log chunk-measure $size - token $token
			    set chunk [BlockingRead $sock $size]

			    set n [string length $chunk]
			    if {$n >= 0} {
				append state(body) $chunk
				incr state(log_size) [string length $chunk]
				##Log chunk $n cumul $state(log_size) -\
					token $token
			    }
			    if {$size != [string length $chunk]} {
				Log "WARNING: mis-sized chunk:\
				    was [string length $chunk], should be\
				    $size - token $token"
				set n 0
				set state(connection) close
				Log ^X$tk end of response (chunk error) \
					- token $token
				set msg {error in chunked encoding - fetch\
					terminated}
				Eot $token $msg
			    }
			    # CRLF that follows chunk.
			    # If eof, this is handled at the end of this proc.
			    getTextLine $sock
			} else {
			    set n 0
			    set state(transfer_final) {}
			}
		    } else {
			# Line expected to hold chunk length is empty, or eof.
			##Log bad-chunk-measure - token $token
			set n 0
			set state(connection) close
			Log ^X$tk end of response (chunk error) - token $token
			Eot $token {error in chunked encoding -\
				fetch terminated}
		    }
		} else {
		    ##Log unchunked - token $token
		    if {$state(totalsize) == 0} {
			# We know the transfer is complete only when the server
			# closes the connection.
			set state(state) complete
			set reqSize $state(-blocksize)
		    } else {
			# Ask for the whole of the unserved response-body.
			# This works around a problem with a tls::socket - for
			# https in keep-alive mode, and a request for
			# $state(-blocksize) bytes, the last part of the
			# resource does not get read until the server times out.
			set reqSize [expr {  $state(totalsize)
					   - $state(currentsize)}]

			# The workaround fails if reqSize is
			# capped at $state(-blocksize).
			# set reqSize [expr {min($reqSize, $state(-blocksize))}]
		    }
		    set c $state(currentsize)
		    set t $state(totalsize)
		    ##Log non-chunk currentsize $c of totalsize $t -\
			    token $token
		    set block [read $sock $reqSize]
		    set n [string length $block]
		    if {$n >= 0} {
			append state(body) $block
			##Log non-chunk [string length $state(body)] -\
				token $token
		    }
		}
		# This calculation uses n from the -handler, chunked, or
		# unchunked case as appropriate.
		if {[info exists state]} {
		    if {$n >= 0} {
			incr state(currentsize) $n
			set c $state(currentsize)
			set t $state(totalsize)
			##Log another $n currentsize $c totalsize $t -\
				token $token
		    }
		    # If Content-Length - check for end of data.
		    if {
			   ($state(totalsize) > 0)
			&& ($state(currentsize) >= $state(totalsize))
		    } {
			Log ^F$tk end of response body (unchunked) -\
				token $token
			set state(state) complete
			Eot $token
		    }
		}
	    } err]} {
		Log ^X$tk end of response (error ${err}) - token $token
		Finish $token $err
		return
	    } else {
		if {[info exists state(-progress)]} {
		    eval $state(-progress) \
			[list $token $state(totalsize) $state(currentsize)]
		}
	    }
	}

	# catch as an Eot above may have closed the socket already
	# $state(state) may be connecting, header, body, or complete
	if {![set cc [catch {eof $sock} eof]] && $eof} {
	    ##Log eof - token $token
	    if {[info exists $token]} {
		set state(connection) close
		if {$state(state) eq "complete"} {
		    # This includes all cases in which the transaction
		    # can be completed by eof.
		    # The value "complete" is set only in http::Event, and it is
		    # used only in the test above.
		    Log ^F$tk end of response body (unchunked, eof) -\
			    token $token
		    Eot $token
		} else {
		    # Premature eof.
		    Log ^X$tk end of response (unexpected eof) - token $token
		    Eot $token eof
		}
	    } else {
		# open connection closed on a token that has been cleaned up.
		Log ^X$tk end of response (token error) - token $token
		CloseSocket $sock
	    }
	} elseif {$cc} {
	    return
	}
    }
}

# http::TestForReplay
#
#	Command called if eof is discovered when a socket is first used for a
#	new transaction.  Typically this occurs if a persistent socket is used
#	after a period of idleness and the server has half-closed the socket.
#
# token  - the connection token returned by http::geturl
# doing  - "read" or "write"
# err    - error message, if any
# caller - code to identify the caller - used only in logging
#
# Return Value: boolean, true iff the command calls http::ReplayIfDead.

proc http::TestForReplay {token doing err caller} {
    variable http
    variable $token
    upvar 0 $token state
    set tk [namespace tail $token]
    if {$doing eq "read"} {
	set code Q
	set action response
	set ing reading
    } else {
	set code P
	set action request
	set ing writing
    }

    if {$err eq {}} {
	set err "detect eof when $ing (server timed out?)"
    }

    if {$state(method) eq "POST" && !$http(-repost)} {
	# No Replay.
	# The present transaction will end when Finish is called.
	# That call to Finish will abort any other transactions
	# currently in the write queue.
	# For calls from http::Event this occurs when execution
	# reaches the code block at the end of that proc.
	set msg {no retry for POST with http::config -repost 0}
	Log reusing socket failed "($caller)" - $msg - token $token
	Log error - $err - token $token
	Log ^X$tk end of $action (error) - token $token
	return 0
    } else {
	# Replay.
	set msg {try a new socket}
	Log reusing socket failed "($caller)" - $msg - token $token
	Log error - $err - token $token
	Log ^$code$tk Any unfinished (incl this one) failed - token $token
	ReplayIfDead $token $doing
	return 1
    }
}

# http::IsBinaryContentType --
#
#	Determine if the content-type means that we should definitely transfer
#	the data as binary. [Bug 838e99a76d]