/*
 * tclWinSerial.c --
 *
 *  This file implements the Windows-specific serial port functions,
 *  and the "serial" channel driver.
 *
 * Copyright (c) 1999 by Scriptics Corp.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * Serial functionality implemented by Rolf.Schroedter@dlr.de
 *
 * RCS: @(#) $Id: tclWinSerial.c,v 1.18 2002/01/15 17:55:31 dgp Exp $
 */

#include "tclWinInt.h"

#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>

static int      SerialEventProc(Tcl_Event *evPtr, int flags);
static void     SerialExitHandler(ClientData clientData);
static int      SerialGetHandleProc(ClientData instanceData,
                int direction, ClientData *handlePtr);
static ThreadSpecificData *SerialInit(void);
static int      SerialInputProc(ClientData instanceData, char *buf,
                int toRead, int *errorCode);
static int      SerialOutputProc(ClientData instanceData, CONST char *buf,
                int toWrite, int *errorCode);
static void     SerialSetupProc(ClientData clientData, int flags);
static void     SerialWatchProc(ClientData instanceData, int mask);
static void     ProcExitHandler(ClientData clientData);
static int       SerialGetOptionProc _ANSI_ARGS_((ClientData instanceData,
                Tcl_Interp *interp, CONST char *optionName,
                Tcl_DString *dsPtr));
static int       SerialSetOptionProc _ANSI_ARGS_((ClientData instanceData,
                Tcl_Interp *interp, CONST char *optionName,
                CONST char *value));
static DWORD WINAPI     SerialWriterThread(LPVOID arg);

/*
 * This structure describes the channel type structure for command serial
 * based IO.
 */

 *
 *----------------------------------------------------------------------
 */

static int
SerialOutputProc(
    ClientData instanceData,    /* Serial state. */
    CONST char *buf,            /* The data buffer. */
    int toWrite,                /* How many bytes to write? */
    int *errorCode)             /* Where to store error code. */
{
    SerialInfo *infoPtr = (SerialInfo *) instanceData;
    int bytesWritten, timeout;

    *errorCode = 0;

 *
 *----------------------------------------------------------------------
 */
static int
SerialSetOptionProc(instanceData, interp, optionName, value)
    ClientData instanceData;    /* File state. */
    Tcl_Interp *interp;         /* For error reporting - can be NULL. */
    CONST char *optionName;     /* Which option to set? */
    CONST char *value;          /* New value for option. */
{
    SerialInfo *infoPtr;
    DCB dcb;
    BOOL result, flag;
    size_t len, vlen;
    Tcl_DString ds;
    TCHAR *native;

 *
 *----------------------------------------------------------------------
 */
static int
SerialGetOptionProc(instanceData, interp, optionName, dsPtr)
    ClientData instanceData;    /* File state. */
    Tcl_Interp *interp;         /* For error reporting - can be NULL. */
    CONST char *optionName;     /* Option to get. */
    Tcl_DString *dsPtr;         /* Where to store value(s). */
{
    SerialInfo *infoPtr;
    DCB dcb;
    size_t len;
    int valid = 0;  /* flag if valid option parsed */