close $f

set path(cat) [makeFile {
    set f stdin
    if {$argv != ""} {
	set f [open [lindex $argv 0]]
    }
    fconfigure $f -encoding binary -translation lf -blocking 0 -eofchar \x1A
    fconfigure stdout -encoding binary -translation lf -buffering none
    fconfigure $f -translation binary -blocking 0 -eofchar \x1A
    fconfigure stdout -translation binary -buffering none
    fileevent $f readable "foo $f"
    proc foo {f} {
	set x [read $f]
	catch {puts -nonewline $x}
	if {[eof $f]} {
	    close $f
	    exit 0

test io-1.5 {Tcl_WriteChars: CheckChannelErrors} {emptyTest} {
    # no test, need to cause an async error.
} {}
set path(test1) [makeFile {} test1]
test io-1.6 {Tcl_WriteChars: WriteBytes} {
    set f [open $path(test1) w]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f "a\x4D\x00"
    close $f
    contents $path(test1)
} "a\x4D\x00"
test io-1.7 {Tcl_WriteChars: WriteChars} {
    set f [open $path(test1) w]
    fconfigure $f -encoding shiftjis

    testreadwrite 0xffffffff
} -result 1

test io-2.1 {WriteBytes} {
    # loop until all bytes are written

    set f [open $path(test1) w]
    fconfigure $f  -encoding binary -buffersize 16 -translation crlf
    fconfigure $f  -translation binary -buffersize 16 -translation crlf
    puts $f "abcdefghijklmnopqrstuvwxyz"
    close $f
    contents $path(test1)
} "abcdefghijklmnopqrstuvwxyz\r\n"
test io-2.2 {WriteBytes: savedLF > 0} {
    # After flushing buffer, there was a \n left over from the last
    # \n -> \r\n expansion.  It gets stuck at beginning of this buffer.

    set f [open $path(test1) w]
    fconfigure $f -encoding binary -buffersize 16 -translation crlf
    fconfigure $f -translation binary -buffersize 16 -translation crlf
    puts -nonewline $f "123456789012345\n12"
    set x [list [contents $path(test1)]]
    close $f
    lappend x [contents $path(test1)]
} [list "123456789012345\r" "123456789012345\r\n12"]
test io-2.3 {WriteBytes: flush on line} {
    # Tcl "line" buffering has weird behavior: if current buffer contains
    # a \n, entire buffer gets flushed.  Logical behavior would be to flush
    # only up to the \n.

    set f [open $path(test1) w]
    fconfigure $f -encoding binary -buffering line -translation crlf
    fconfigure $f -translation binary -buffering line -translation crlf
    puts -nonewline $f "\n12"
    set x [contents $path(test1)]
    close $f
    set x
} "\r\n12"
test io-2.4 {WriteBytes: reset sawLF after each buffer} {
    set f [open $path(test1) w]
     fconfigure $f -encoding binary -buffering line -translation lf \
     fconfigure $f -translation binary -buffering line -buffersize 16
	     -buffersize 16
    puts -nonewline $f "abcdefg\nhijklmnopqrstuvwxyz"
    set x [list [contents $path(test1)]]
    close $f
    lappend x [contents $path(test1)]
} [list "abcdefg\nhijklmno" "abcdefg\nhijklmnopqrstuvwxyz"]
test io-2.5 {WriteBytes: large file (> INT_MAX). Bug 3d01d51bc4} -constraints {
    pointerIs64bit perf

    close $f
    set x
} "1234567890123０１２３４"
test io-7.2 {FilterInputBytes: split up character in middle of buffer} {
    # (bufPtr->nextAdded < bufPtr->bufLength)

    set f [open $path(test1) w]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f "1234567890\n123\x82\x4F\x82\x50\x82"
    close $f
    set f [open $path(test1)]
    fconfigure $f -encoding shiftjis -profile tcl8
    set x [list [gets $f line] $line [eof $f]]
    close $f
    set x
} [list 10 "1234567890" 0]
test io-7.3 {FilterInputBytes: split up character at EOF} testchannel {
    set f [open $path(test1) w]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f "1234567890123\x82\x4F\x82\x50\x82"
    close $f
    set f [open $path(test1)]
    fconfigure $f -encoding shiftjis -profile tcl8
    set x [list [gets $f line] $line]
    lappend x [tell $f] [testchannel inputbuffered $f] [eof $f]
    lappend x [gets $f line] $line
    close $f
    set x
} [list 16 "1234567890123０１\x82" 18 0 1 -1 ""]
test io-7.4 {FilterInputBytes: recover from split up character} {stdio fileevent} {
    set f [open "|[list [interpreter] $path(cat)]" w+]
    fconfigure $f -encoding binary -buffering none
    fconfigure $f -translation binary -buffering none
    puts -nonewline $f "1234567890123\x82\x4F\x82\x50\x82"
    fconfigure $f -encoding shiftjis -blocking 0
    fileevent $f read [namespace code "ready $f"]
    variable x {}
    proc ready {f} {
	variable x
	lappend x [gets $f line] $line [fblocked $f]
    }
    vwait [namespace which -variable x]
    fconfigure $f -encoding binary -blocking 1
    fconfigure $f -translation binary -blocking 1
    puts $f "\x51\x82\x52"
    fconfigure $f -encoding shiftjis
    vwait [namespace which -variable x]
    close $f
    set x
} [list -1 "" 1 17 "1234567890123０１２３" 0]

    # not (bytesLeft == 0)

    set f [open $path(test1) w+]
    fconfigure $f -translation binary
    puts $f "${a}\r\nabcdef"
    close $f
    set f [open $path(test1)]
    fconfigure $f -encoding binary -translation auto
    fconfigure $f -translation binary -translation auto

    # "${a}\r" was converted in one operation (because ENCODING_LINESIZE
    # is 30).  To check if "\n" follows, calls PeekAhead and determines
    # that cached data is available in buffer w/o having to call driver.

    set x [gets $f]
    close $f

test io-11.1 {ReadBytes: want to read a lot} {
    # ((unsigned) toRead > (unsigned) srcLen)

    set f [open $path(test1) w]
    puts -nonewline $f abcdefghijkl
    close $f
    set f [open $path(test1)]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # here
    set x [read $f 1000]
    close $f
    set x
} {abcdefghijkl}
test io-11.2 {ReadBytes: want to read all} {
    # ((unsigned) toRead > (unsigned) srcLen)

    set f [open $path(test1) w]
    puts -nonewline $f abcdefghijkl
    close $f
    set f [open $path(test1)]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # here
    set x [read $f]
    close $f
    set x
} {abcdefghijkl}
test io-11.3 {ReadBytes: allocate more space} {
    # (toRead > length - offset - 1)

    set f [open $path(test1) w]
    puts -nonewline $f abcdefghijklmnopqrstuvwxyz
    close $f
    set f [open $path(test1)]
    fconfigure $f -buffersize 16 -encoding binary
    fconfigure $f -buffersize 16 -translation binary
    # here
    set x [read $f]
    close $f
    set x
} {abcdefghijklmnopqrstuvwxyz}
test io-11.4 {ReadBytes: EOF char found} {
    # (TranslateInputEOL() != 0)

    set f [open $path(test1) w]
    puts $f abcdefghijklmnopqrstuvwxyz
    close $f
    set f [open $path(test1)]
    fconfigure $f -eofchar m -encoding binary
    fconfigure $f -translation binary -eofchar m
    # here
    set x [list [read $f] [eof $f] [read $f] [eof $f]]
    close $f
    set x
} [list "abcdefghijkl" 1 "" 1]

test io-12.1 {ReadChars: want to read a lot} {

    close $f
    set x
} {abcdefghijklmnopqrstuvwxyz}
test io-12.4 {ReadChars: split-up char} {stdio testchannel fileevent} {
    # (srcRead == 0)

    set f [open "|[list [interpreter] $path(cat)]" w+]
    fconfigure $f -encoding binary -buffering none -buffersize 16
    fconfigure $f -translation binary -buffering none -buffersize 16
    puts -nonewline $f "123456789012345\x96"
    fconfigure $f -encoding shiftjis -blocking 0

    fileevent $f read [namespace code "ready $f"]
    proc ready {f} {
	variable x
	lappend x [read $f] [testchannel inputbuffered $f]
    }
    variable x {}

    fconfigure $f -encoding shiftjis
    vwait [namespace which -variable x]
    fconfigure $f -encoding binary -blocking 1
    fconfigure $f -translation binary -blocking 1
    puts -nonewline $f "\x7B"
    after 500			;# Give the cat process time to catch up
    fconfigure $f -encoding shiftjis -blocking 0
    vwait [namespace which -variable x]
    close $f
    set x
} [list "123456789012345" 1 "本" 0]
test io-12.5 {ReadChars: fileevents on partial characters} {stdio fileevent} {
    set path(test1) [makeFile {
	fconfigure stdout -encoding binary -buffering none
	fconfigure stdout -translation binary -buffering none
	gets stdin; puts -nonewline "\xE7"
	gets stdin; puts -nonewline "\x89"
	gets stdin; puts -nonewline "\xA6"
    } test1]
    set f [open "|[list [interpreter] $path(test1)]" r+]
    fileevent $f readable [namespace code {
	lappend x [read $f]

    lappend l [tell $f]
    close $f
    set l
} {29 39 40 447}
test io-34.21 {Tcl_Seek and Tcl_Tell on large files} {largefileSupport extensive} {
    file delete $path(test3)
    set f [open $path(test3) w]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    set l ""
    lappend l [tell $f]
    puts -nonewline $f abcdef
    lappend l [tell $f]
    flush $f
    lappend l [tell $f]
    # 4GB offset!

    lappend x [gets $f1]
    lappend x [fblocked $f1]
    close $f1
    set x
} {{} 1 hello 0 {} 1}
test io-36.1.1 {Tcl_InputBlocked on nonblocking binary pipe} stdio {
    set f1 [open "|[list [interpreter]]" r+]
    chan configure $f1 -encoding binary -translation lf
    chan configure $f1 -translation binary
    puts $f1 {
	chan configure stdout -encoding binary -translation lf
	chan configure stdout -translation binary
	puts hello_from_pipe
    }
    flush $f1
    gets $f1
    fconfigure $f1 -blocking off -buffering full
    puts $f1 {puts hello}
    set x ""

    set x [fconfigure $f -buffersize]
    close $f
    set x
} 40000
test io-39.14 {Tcl_SetChannelOption: -encoding, binary & utf-8} {
    file delete $path(test1)
    set f [open $path(test1) w]
    fconfigure $f -encoding {}
    fconfigure $f -translation binary
    puts -nonewline $f \xE7\x89\xA6
    close $f
    set f [open $path(test1) r]
    fconfigure $f -encoding utf-8
    set x [read $f]
    close $f
    set x
} 牦
test io-39.15 {Tcl_SetChannelOption: -encoding, binary & utf-8} {
    file delete $path(test1)
    set f [open $path(test1) w]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f \xE7\x89\xA6
    close $f
    set f [open $path(test1) r]
    fconfigure $f -encoding utf-8
    set x [read $f]
    close $f
    set x

    set f [open $path(test1) w]
    fconfigure $f -e foobar
} -cleanup {
    close $f
} -returnCodes 1 -match glob -result {bad option "-e": should be one of *}
test io-39.17 {Tcl_SetChannelOption: -encoding, clearing CHANNEL_NEED_MORE_DATA} {stdio fileevent} {
    set f [open "|[list [interpreter] $path(cat)]" r+]
    fconfigure $f -encoding binary
    fconfigure $f -encoding iso8859-1
    puts -nonewline $f "\xE7"
    flush $f
    fconfigure $f -encoding utf-8 -blocking 0
    variable x {}
    fileevent $f readable [namespace code { lappend x [read $f] }]
    vwait [namespace which -variable x]
    after 300 [namespace code { lappend x timeout }]
    vwait [namespace which -variable x]
    fconfigure $f -encoding utf-8
    vwait [namespace which -variable x]
    after 300 [namespace code { lappend x timeout }]
    vwait [namespace which -variable x]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    vwait [namespace which -variable x]
    after 300 [namespace code { lappend x timeout }]
    vwait [namespace which -variable x]
    close $f
    set x
} "{} timeout {} timeout \xE7 timeout"
test io-39.18 {Tcl_SetChannelOption, setting read mode independently} \

	    [file size $path(utf8-rp.txt)]
} {3 5 5}
test io-52.10 {TclCopyChannel & encodings} -constraints fcopy -body {
    set in  [open $path(kyrillic.txt) r]
    set out [open $path(utf8-fcopy.txt) w]

    fconfigure $in  -encoding koi8-r -translation lf
    # -translation binary is also -encoding binary
    fconfigure $out -translation binary

    fcopy $in $out

    file size $path(utf8-fcopy.txt)
} -cleanup {
    close $in
    close $out
} -returnCodes 1 -match glob -result {error writing "*":\
    invalid or incomplete multibyte or wide character}
test io-52.11 {TclCopyChannel & encodings} -setup {
    set out [open $path(utf8-fcopy.txt) w]
    fconfigure $out -encoding utf-8 -translation lf -profile strict
    puts $out АА
    close $out
} -constraints {fcopy} -body {
    set in  [open $path(utf8-fcopy.txt) r]
    set out [open $path(kyrillic.txt) w]
    # -translation binary is also -encoding binary
    fconfigure $in  -translation binary
    fconfigure $out -encoding koi8-r -translation lf -profile strict
    catch {fcopy $in $out} cres copts
	return $cres
} -cleanup {
	if {$in in [chan names]} {
		close $in

    testobj freeallvars
    removeFile io-74.1
} -returnCodes error -match glob -result {can not find channel named "*"}

test io-75.1 {multibyte encoding error read results in raw bytes (-profile tcl8)} -setup {
    set fn [makeFile {} io-75.1]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # In UTF-8, a byte 0xCx starts a multibyte sequence and must be followed
    # by a byte > 0x7F. This is violated to get an invalid sequence.
    puts -nonewline $f A\xC0\x40
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -profile tcl8 -buffering none
} -body {

# Incomplete sequence test.
# This error may IMHO only be detected with the close.
# But the read already returns the incomplete sequence.
test io-75.3 {incomplete multibyte encoding read is ignored (-profile tcl8)} -setup {
    set fn [makeFile {} io-75.3]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f "A\xC0"
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -profile tcl8
} -body {
    set d [read $f]
    binary scan $d H* hd
    set hd
} -cleanup {
    close $f
    removeFile io-75.3
} -result 41c0

# As utf-8 has a special treatment in multi-byte decoding, also test another
# one.
test io-75.4 {shiftjis encoding error read results in raw bytes (-profile tcl8)} -setup {
    set fn [makeFile {} io-75.4]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # In shiftjis, \x81 starts a two-byte sequence.
    # But 2nd byte \xFF is not allowed
    puts -nonewline $f A\x81\xFFA
    flush $f
    seek $f 0
    fconfigure $f -encoding shiftjis -buffering none -eofchar "" -translation lf -profile tcl8
} -body {
    set d [read $f]
    binary scan $d H* hd
    set hd
} -cleanup {
    close $f
    removeFile io-75.4
} -result 4181ff41

test io-75.5 {invalid utf-8 encoding read is ignored (-profile tcl8)} -setup {
    set fn [makeFile {} io-75.5]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -eofchar "" -translation lf -profile tcl8
} -body {
    set d [read $f]
    binary scan $d H* hd

} -match glob -result {41 1 {error reading "file*":\
	invalid or incomplete multibyte or wide character}}


test io-75.6.gets {invalid utf-8 encoding, gets is not ignored (-profile strict)} -setup {
    set fn [makeFile {} io-75.6]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # \x81 is an incomplete byte sequence in utf-8
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none \
	    -translation lf -profile strict
} -body {
    gets $f
} -cleanup {
    close $f
    removeFile io-75.6
} -match glob -returnCodes 1 -result {error reading "file*":\
	invalid or incomplete multibyte or wide character}

test io-75.6.1 {invalid utf-8 encoding, blocking gets is not ignored (-profile strict)} -setup {
    set fn [makeFile {} io-75.6.1]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # utf-8: \xC3 requires a 2nd byte > x80, but <x80 is delivered
    puts -nonewline $f A\xC3B
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none \
	    -translation lf -profile strict
} -body {
    gets $f
} -cleanup {
    close $f
    removeFile io-75.6.1
} -match glob -returnCodes 1 -result {error reading "file*":\
	invalid or incomplete multibyte or wide character}

test io-75.6.2 {invalid utf-8 encoding, blocking gets is not ignored (-profile strict), recover functionality} -setup {
    set fn [makeFile {} io-75.6.2]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # utf-8: \xC3 requires a 2nd byte > x80, but <x80 is delivered
    puts -nonewline $f A\xC3B
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none \
	    -translation lf -profile strict
} -body {
    set l {}
    lappend l [catch {gets $f}]
    lappend l [tell $f]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    lappend l [expr {[gets $f] eq "A\xC3B"}]
} -cleanup {
    close $f
    removeFile io-75.6.2
} -match glob -returnCodes 0 -result {1 0 1}

# TCL ticket c4eb46a196: non blocking case had endless loop, so test it
test io-75.6.3 {invalid utf-8 encoding, non blocking gets is not ignored (-profile strict)} -setup {
    set fn [makeFile {} io-75.6.3]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # utf-8: \xC3 requires a 2nd byte > x80, but <x80 is delivered
    puts -nonewline $f A\xC3B
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none \
	    -translation lf -profile strict -blocking 0
} -body {
    gets $f
} -cleanup {
    close $f
    removeFile io-75.6.3
} -match glob -returnCodes 1 -result {error reading "file*":\
	invalid or incomplete multibyte or wide character}

test io-75.6.4 {incomplete utf-8 encoding, non blocking gets is not ignored (-profile strict)} -setup {
    set fn [makeFile {} io-75.6.4]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # \x81 is an incomplete byte sequence in utf-8
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none \
	    -translation lf -profile strict -blocking 0
} -body {

test io-75.7.read {
    invalid utf-8 encoding read is not ignored (-profile strict)
} -setup {
    set fn [makeFile {} io-75.7]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # \x81 is invalid in utf-8
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -translation lf \
	    -profile strict
} -body {

test {io-75.8 {incomplete input after eof}} {
    incomplete utf-8 char after eof char is not an error (-profile strict)
} -setup {
    set hd {}
    set fn [makeFile {} io-75.8]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
	# \x81 is invalid in utf-8, but since the eof character \x1A comes first,
	# -eofchar takes precedence.
    puts -nonewline $f A\x1A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -eofchar \x1A \
	-translation lf -profile strict

test {io-75.8 {invalid input before eof}} {
	invalid utf-8 encoding eof handling (-profile strict)
} -setup {
    set fn [makeFile {} io-75.8]
    set f [open $fn w+]
    # This also configures the channel encoding profile as strict.
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # \x81 is invalid in utf-8. -eofchar is not detected, because it comes later.
    puts -nonewline $f A\x81\x81\x1A
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -eofchar \x1A \
	-translation lf -profile strict
} -body {

test io-strict-multibyte-eof {
    incomplete utf-8 sequence immediately prior to eof character

    See issue 25cdcb7e8fb381fb
} -setup {
    set chan [file tempfile];
    fconfigure $chan -encoding binary
    fconfigure $chan -translation binary
    puts -nonewline $chan \x81\x1A
    flush $chan
    seek $chan 0
    chan configure $chan -encoding utf-8 -profile strict
} -body {
    list [catch {read $chan 1} msg data] $msg [if {
	    [dict exists $data -result read]

test {io-75.10 {profile tcl8}} {
    incomplete multibyte encoding read is not ignored because "binary" sets
    profile to strict
} -setup {
    set res {}
    set fn [makeFile {} io-75.10]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f A\xC0
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none
} -body {
    catch {read $f} errmsg
    lappend res $errmsg

# This may be expected due to special utf-8 handling.

# As utf-8 has a special treatment in multi-byte decoding, also test another
# one.
test io-75.11 {shiftjis encoding error read results in error (strict profile)} -setup {
    set fn [makeFile {} io-75.11]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # In shiftjis, \x81 starts a two-byte sequence.
    # But 2nd byte \xFF is not allowed
    puts -nonewline $f A\x81\xFFA
    flush $f
    seek $f 0
    fconfigure $f -encoding shiftjis -blocking 0 -translation lf \
	-profile strict

test {io-75.12 {profile tcl8}} {
    invalid utf-8 encoding read, is not ignored because setting the encoding to
    "binary" also sets the profile to strict
} -setup {
    set res {}
    set fn [makeFile {} io-75.12]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -translation lf
} -body {
    catch {read $f} errmsg
    lappend res $errmsg

test io-75.13.nonblocking {
    In nonblocking mode when there is an encoding error the data that has been
    successfully read so far is returned first and then the error is returned
    on the next call to [read].
} -setup {
    set fn [makeFile {} io-75.13]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    fconfigure $f -translation binary
    # \x81 is invalid in utf-8
    puts -nonewline $f A\x81
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -blocking 0 -translation lf \
	-profile strict
} -body {

test io-75.14 {
	[gets] succesfully returns lines prior to error

	invalid utf-8 encoding [gets] continues in non-strict mode after error
} -setup {
    set chan [file tempfile]
    fconfigure $chan -encoding binary
    fconfigure $chan -translation binary
    # \xC0\n is an invalid utf-8 sequence
    puts -nonewline $chan a\nb\nc\xC0\nd\n
    flush $chan
    seek $chan 0
    fconfigure $chan -encoding utf-8 -buffering none \
	-translation auto -profile strict
} -body {

test io-75.15 {
    invalid utf-8 encoding strict
    gets does not hang
    gets succeeds for the first two lines
} -setup {
    set res {}
    set chan [file tempfile]
    fconfigure $chan -encoding binary
    fconfigure $chan -translation binary
    # \xC0\x40 is an invalid utf-8 sequence
    puts $chan hello\nAB\nCD\xC0\x40EF\nGHI
	seek $chan 0
} -body {
    #Now try to read it with [gets]
    fconfigure $chan -encoding utf-8 -profile strict
    lappend res [gets $chan]