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/*

 * tclWin16.c --

 *

 *      This file contains code for a 16-bit DLL to handle 32-to-16 bit

 *      thunking. This is necessary for the Win32s SynchSpawn() call.

 *

 * Copyright (c) 1994-1997 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * RCS: @(#) $Id: tclWin16.c,v 1.1.1.1 2002-01-16 10:25:38 markom Exp $

 */

#define STRICT

#include <windows.h>  

#include <toolhelp.h> 

#include <stdio.h>

#include <string.h>

static int                      WinSpawn(char *command);

static int                      DosSpawn(char *command, char *fromFileName,

                                    char *toFileName);

static int                      WaitForExit(int inst);

/*

 * The following data is used to construct a .pif file that wraps the

 * .bat file that runs the 16-bit application (that Jack built).

 * The .pif file causes the .bat file to run in an iconified window.

 * Otherwise, when we try to exec something, a DOS box pops up,

 * obscuring everything, and then almost immediately flickers out of

 * existence, which is rather disconcerting.

 */

static char pifData[545] = {

'\000', '\013', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\200', '\000', '\200', '\000', '\103', '\117', '\115', '\115',

'\101', '\116', '\104', '\056', '\103', '\117', '\115', '\000',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\020', '\000', '\000', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\177', '\001', '\000',

'\377', '\031', '\120', '\000', '\000', '\007', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\340',

'\040', '\115', '\111', '\103', '\122', '\117', '\123', '\117',

'\106', '\124', '\040', '\120', '\111', '\106', '\105', '\130',

'\000', '\207', '\001', '\000', '\000', '\161', '\001', '\127',

'\111', '\116', '\104', '\117', '\127', '\123', '\040', '\063',

'\070', '\066', '\040', '\063', '\056', '\060', '\000', '\005',

'\002', '\235', '\001', '\150', '\000', '\200', '\002', '\200',

'\000', '\144', '\000', '\062', '\000', '\000', '\004', '\000',

'\000', '\000', '\004', '\000', '\000', '\002', '\020', '\002',

'\000', '\037', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\000', '\000', '\000',

'\000', '\000', '\000', '\000', '\000', '\057', '\143', '\040',

'\146', '\157', '\157', '\056', '\142', '\141', '\164', '\000',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\040', '\040', '\040',

'\040', '\040', '\040', '\040', '\040', '\127', '\111', '\116',

'\104', '\117', '\127', '\123', '\040', '\062', '\070', '\066',

'\040', '\063', '\056', '\060', '\000', '\377', '\377', '\033',

'\002', '\006', '\000', '\000', '\000', '\000', '\000', '\000',

'\000'

};

static HINSTANCE hInstance;

/*

 *----------------------------------------------------------------------

 *

 * LibMain --

 *

 *      16-bit DLL entry point.

 *

 * Results:

 *      Returns 1.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

int CALLBACK

LibMain(

    HINSTANCE hinst,

    WORD wDS,

    WORD cbHeap,

    LPSTR unused)

{

    hInstance   = hinst;

    wDS         = wDS;          /* lint. */

    cbHeap      = cbHeap;       /* lint. */

    unused      = unused;       /* lint. */

    return TRUE;

}

/*

 *----------------------------------------------------------------------

 *

 * UTProc --

 *

 *      Universal Thunk dispatch routine.  Executes a 16-bit DOS

 *      application or a 16-bit or 32-bit Windows application and

 *      waits for it to complete.

 *

 * Results:

 *      1 if the application could be run, 0 or -1 on failure.

 *

 * Side effects:

 *      Executes 16-bit code.

 *

 *----------------------------------------------------------------------

 */

int WINAPI

UTProc(buf, func)

    void *buf;

    DWORD func;

{

    char **args;

    args = (char **) buf;

    if (func == 0) {

        return DosSpawn(args[0], args[1], args[2]);

    } else {

        return WinSpawn(args[0]);

    }

}

/*

 *-------------------------------------------------------------------------

 *

 * WinSpawn --

 *

 *      Start a 16-bit or 32-bit Windows application with optional

 *      command line arguments and wait for it to finish.  Windows

 *      applications do not handle input/output redirection.

 *

 * Results:

 *      The return value is 1 if the application could be run, 0 otherwise.

 *

 * Side effects:

 *      Whatever the application does.

 *

 *-------------------------------------------------------------------------

 */

static int

WinSpawn(command)

    char *command;              /* The command line, consisting of the name

                                 * of the executable to run followed by any

                                 * number of arguments to the executable. */

{

    return WaitForExit(WinExec(command, SW_SHOW));

}

/*

 *---------------------------------------------------------------------------

 *

 * DosSpawn --

 *

 *      Start a 16-bit DOS program with optional command line arguments

 *      and wait for it to finish.  Input and output can be redirected

 *      from the specified files, but there is no such thing as stderr

 *      under Win32s.

 *

 *      This procedure to constructs a temporary .pif file that wraps a

 *      temporary .bat file that runs the 16-bit application.  The .bat

 *      file is necessary to get the redirection symbols '<' and '>' to

 *      work, because WinExec() doesn't accept them.  The .pif file is

 *      necessary to cause the .bat file to run in an iconified window,

 *      to avoid having a large DOS box pop up, obscuring everything, and

 *      then almost immediately flicker out of existence, which is rather

 *      disconcerting.

 *

 * Results:

 *      The return value is 1 if the application could be run, 0 otherwise.

 *

 * Side effects:

 *      Whatever the application does.

 *

 *---------------------------------------------------------------------------

 */

static int

DosSpawn(command, fromFileName, toFileName)

    char *command;              /* The name of the program, plus any

                                 * arguments, to be run. */

    char *fromFileName;         /* Standard input for the program is to be

                                 * redirected from this file, or NULL for no

                                 * standard input. */

    char *toFileName;           /* Standard output for the program is to be

                                 * redirected to this file, or NULL to

                                 * discard standard output. */

{

    int result;

    HFILE batFile, pifFile;

    char batFileName[144], pifFileName[144];

    GetTempFileName(0, "tcl", 0, batFileName);

    unlink(batFileName);

    strcpy(strrchr(batFileName, '.'), ".bat");

    batFile = _lcreat(batFileName, 0);

    GetTempFileName(0, "tcl", 0, pifFileName);

    unlink(pifFileName);

    strcpy(strrchr(pifFileName, '.'), ".pif");

    pifFile = _lcreat(pifFileName, 0);

    _lwrite(batFile, command, strlen(command));

    if (fromFileName == NULL) {

        _lwrite(batFile, " < nul", 6);

    } else {

        _lwrite(batFile, " < ", 3);

        _lwrite(batFile, fromFileName, strlen(fromFileName));

    }

    if (toFileName == NULL) {

        _lwrite(batFile, " > nul", 6);

    } else {

        _lwrite(batFile, " > ", 3);

        _lwrite(batFile, toFileName, strlen(toFileName));

    }

    _lwrite(batFile, "\r\n\032", 3);

    _lclose(batFile);

    strcpy(pifData + 0x1c8, batFileName);

    _lwrite(pifFile, pifData, sizeof(pifData));

    _lclose(pifFile);

    result = WaitForExit(WinExec(pifFileName, SW_MINIMIZE));

    unlink(pifFileName);

    unlink(batFileName);

    return result;

}

/*

 *-------------------------------------------------------------------------

 *

 * WaitForExit --

 *

 *      Wait until the application with the given instance handle has

 *      finished.  PeekMessage() is used to yield the processor;

 *      otherwise, nothing else could execute on the system.

 *

 * Results:

 *      The return value is 1 if the process exited successfully,

 *      or 0 otherwise.

 *

 * Side effects:

 *      None.

 *

 *---------------------------------------------------------------------------

 */

static int

WaitForExit(inst)

    int inst;                   /* Identifies the instance handle of the

                                 * process to wait for. */

{

    TASKENTRY te;

    MSG msg;

    UINT timer;

    if (inst < 32) {

        return 0;

    }

    te.dwSize = sizeof(te);

    te.hInst = 0;

    TaskFirst(&te);

    do {

        if (te.hInst == (HINSTANCE) inst) {

            break;

        }

    } while (TaskNext(&te) != FALSE);

    if (te.hInst != (HINSTANCE) inst) {

        return 0;

    }

    timer = SetTimer(NULL, 0, 0, NULL);

    while (1) {

        if (GetMessage(&msg, NULL, 0, 0) != 0) {

            TranslateMessage(&msg);

            DispatchMessage(&msg);

        }

        TaskFirst(&te);

        do {

            if (te.hInst == (HINSTANCE) inst) {

                break;

            }

        } while (TaskNext(&te) != FALSE);

        if (te.hInst != (HINSTANCE) inst) {

            KillTimer(NULL, timer);

            return 1;

        }

    }

}