/*
 * bltWinMain.c --
 *
 *	Main entry point for wish and other Tk-based applications.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) winMain.c 1.37 98/01/20 22:47:06
 */

#include "bltInt.h"
#include <locale.h>

/*
 * Forward declarations for procedures defined later in this file:
 */

static void setargv _ANSI_ARGS_((int *argcPtr, char ***argvPtr));

#if (TCL_VERSION_NUMBER >= _VERSION(8,2,0)) 
static BOOL consoleRequired = TRUE;
#endif

extern EXPORT int Blt_Init(Tcl_Interp *interp);
extern EXPORT int Blt_SafeInit(Tcl_Interp *interp);
static Tcl_AppInitProc AppInit;


/*
 *-------------------------------------------------------------------------
 *
 * setargv --
 *
 *	Parse the Windows command line string into argc/argv.  Done here
 *	because we don't trust the builtin argument parser in crt0.
 *	Windows applications are responsible for breaking their command
 *	line into arguments.
 *
 *	2N backslashes + quote -> N backslashes + begin quoted string
 *	2N + 1 backslashes + quote -> literal
 *	N backslashes + non-quote -> literal
 *	quote + quote in a quoted string -> single quote
 *	quote + quote not in quoted string -> empty string
 *	quote -> begin quoted string
 *
 * Results:
 *	Fills argcPtr with the number of arguments and argvPtr with the
 *	array of arguments.
 *
 * Side effects:
 *	Memory allocated.
 *
 *--------------------------------------------------------------------------
 */

static void
setargv(
    int *argcPtr,		/* Filled with number of argument strings. */
    char ***argvPtr)
{				/* Filled with argument strings (malloc'd). */
    char *cmdLine, *p, *arg, *argSpace;
    char **argv;
    int argc, size, inquote, copy, slashes;

    cmdLine = GetCommandLine();	/* INTL: BUG */

    /*
     * Precompute an overly pessimistic guess at the number of arguments
     * in the command line by counting non-space spans.
     */

    size = 2;
    for (p = cmdLine; *p != '\0'; p++) {
	if ((*p == ' ') || (*p == '\t')) {	/* INTL: ISO space. */
	    size++;
	    while ((*p == ' ') || (*p == '\t')) { /* INTL: ISO space. */
		p++;
	    }
	    if (*p == '\0') {
		break;
	    }
	}
    }
    argSpace = (char *)Tcl_Alloc(
	(unsigned)(size * sizeof(char *) + strlen(cmdLine) + 1));
    argv = (char **)argSpace;
    argSpace += size * sizeof(char *);
    size--;

    p = cmdLine;
    for (argc = 0; argc < size; argc++) {
	argv[argc] = arg = argSpace;
	while ((*p == ' ') || (*p == '\t')) {	/* INTL: ISO space. */
	    p++;
	}
	if (*p == '\0') {
	    break;
	}
	inquote = 0;
	slashes = 0;
	while (1) {
	    copy = 1;
	    while (*p == '\\') {
		slashes++;
		p++;
	    }
	    if (*p == '"') {
		if ((slashes & 1) == 0) {
		    copy = 0;
		    if ((inquote) && (p[1] == '"')) {
			p++;
			copy = 1;
		    } else {
			inquote = !inquote;
		    }
		}
		slashes >>= 1;
	    }
	    while (slashes) {
		*arg = '\\';
		arg++;
		slashes--;
	    }

	    if ((*p == '\0') || (!inquote && ((*p == ' ') || 
	      (*p == '\t')))) {	/* INTL: ISO space. */
		break;
	    }
	    if (copy != 0) {
		*arg = *p;
		arg++;
	    }
	    p++;
	}
	*arg = '\0';
	argSpace = arg + 1;
    }
    argv[argc] = NULL;

    *argcPtr = argc;
    *argvPtr = argv;
}


#ifdef TCL_ONLY

/*
 *----------------------------------------------------------------------
 *
 * main --
 *
 *	This is the main program for the application.
 *
 * Results:
 *	None: Tcl_Main never returns here, so this procedure never
 *	returns either.
 *
 * Side effects:
 *	Whatever the application does.
 *
 *----------------------------------------------------------------------
 */
int
main(argc, argv)
    int argc;			/* Number of command-line arguments. */
    char **argv;		/* Values of command-line arguments. */
{
    char buffer[MAX_PATH +1];
    char *p;
    /*
     * Set up the default locale to be standard "C" locale so parsing
     * is performed correctly.
     */

    setlocale(LC_ALL, "C");
    setargv(&argc, &argv);

    /*
     * Replace argv[0] with full pathname of executable, and forward
     * slashes substituted for backslashes.
     */

    GetModuleFileName(NULL, buffer, sizeof(buffer));
    argv[0] = buffer;
    for (p = buffer; *p != '\0'; p++) {
	if (*p == '\\') {
	    *p = '/';
	}
    }
    Tcl_Main(argc, argv, AppInit);
    return 0;			/* Needed only to prevent compiler warning. */
}

#else /* TCL_ONLY */

#if (TK_VERSION_NUMBER < _VERSION(8,2,0)) 
/*
 * The following declarations refer to internal Tk routines.  These
 * interfaces are available for use, but are not supported.
 */
extern void TkConsoleCreate(void);
extern int TkConsoleInit(Tcl_Interp *interp);

#endif /* TK_VERSION_NUMBER < 8.2.0 */


/*
 *----------------------------------------------------------------------
 *
 * WishPanic --
 *
 *	Display a message and exit.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Exits the program.
 *
 *----------------------------------------------------------------------
 */

void
WishPanic
TCL_VARARGS_DEF(char *, arg1)
{
    va_list argList;
    char buf[1024];
    CONST char *format;

    format = TCL_VARARGS_START(char *, arg1, argList);
    vsprintf(buf, format, argList);

    MessageBeep(MB_ICONEXCLAMATION);
    MessageBox(NULL, buf, "Fatal Error in Wish",
	MB_ICONSTOP | MB_OK | MB_TASKMODAL | MB_SETFOREGROUND);
#if defined(_MSC_VER) || defined(__BORLANDC__)
    DebugBreak();
#ifdef notdef			/* Panics shouldn't cause exceptions.
				 * Simply let the program exit. */
    _asm {
	int 3
    }
#endif
#endif /* _MSC_VER || __BORLANDC__ */
    ExitProcess(1);
}

/*
 *----------------------------------------------------------------------
 *
 * WinMain --
 *
 *	Main entry point from Windows.
 *
 * Results:
 *	Returns false if initialization fails, otherwise it never
 *	returns.
 *
 * Side effects:
 *	Just about anything, since from here we call arbitrary Tcl code.
 *
 *----------------------------------------------------------------------
 */

int APIENTRY
WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpszCmdLine,
    int nCmdShow)
{
    char **argv;
    int argc;

    Tcl_SetPanicProc(WishPanic);

    /*
     * Set up the default locale to be standard "C" locale so parsing
     * is performed correctly.
     */

    setlocale(LC_ALL, "C");
    setargv(&argc, &argv);

    /*
     * Increase the application queue size from default value of 8.
     * At the default value, cross application SendMessage of WM_KILLFOCUS
     * will fail because the handler will not be able to do a PostMessage!
     * This is only needed for Windows 3.x, since NT dynamically expands
     * the queue.
     */

    SetMessageQueue(64);

    /*
     * Create the console channels and install them as the standard
     * channels.  All I/O will be discarded until TkConsoleInit is
     * called to attach the console to a text widget.
     */
#if (TCL_VERSION_NUMBER >= _VERSION(8,2,0)) 
    consoleRequired = TRUE;
#else
    TkConsoleCreate();
#endif
    Tk_Main(argc, argv, AppInit);
    return 1;
}

#endif /* TCL_ONLY */


/*
 *----------------------------------------------------------------------
 *
 * AppInit --
 *
 *	This procedure performs application-specific initialization.
 *	Most applications, especially those that incorporate additional
 *	packages, will have their own version of this procedure.
 *
 * Results:
 *	Returns a standard Tcl completion code, and leaves an error
 *	message in the interp's result if an error occurs.
 *
 * Side effects:
 *	Depends on the startup script.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_ONLY
static int
AppInit(Tcl_Interp *interp)
{				/* Interpreter for application. */
#ifdef TCLLIBPATH
    /* 
     * It seems that some distributions of Tcl don't compile-in a
     * default location of the library.  This causes Tcl_Init to fail
     * if bltwish and bltsh are moved to another directory. The
     * workaround is to set the magic variable "tclDefaultLibrary".
     */
    Tcl_SetVar(interp, "tclDefaultLibrary", TCLLIBPATH, TCL_GLOBAL_ONLY);
#endif
    if (Tcl_Init(interp) == TCL_ERROR) {
	return TCL_ERROR;
    }
    if (Blt_Init(interp) == TCL_ERROR) {
	return TCL_ERROR;
    }
    Tcl_StaticPackage(interp, "Blt", Blt_Init, Blt_SafeInit);
    Tcl_SetVar(interp, "tcl_rcFileName", "~/tclshrc.tcl", TCL_GLOBAL_ONLY);
    return TCL_OK;
}

#else 

static int
AppInit(Tcl_Interp *interp)
{				/* Interpreter for application. */
#ifdef TCLLIBPATH
    /* 
     * It seems that some distributions of Tcl don't compile-in a
     * default location of the library.  This causes Tcl_Init to fail
     * if bltwish and bltsh are moved to another directory. The
     * workaround is to set the magic variable "tclDefaultLibrary".
     */
    Tcl_SetVar(interp, "tclDefaultLibrary", TCLLIBPATH, TCL_GLOBAL_ONLY);
#endif
    if (Tcl_Init(interp) == TCL_ERROR) {
	goto error;
    }
    if (Tk_Init(interp) == TCL_ERROR) {
	goto error;
    }
    Tcl_StaticPackage(interp, "Tk", Tk_Init, Tk_SafeInit);
    if (Blt_Init(interp) == TCL_ERROR) {
	goto error;
    }
    Tcl_StaticPackage(interp, "Blt", Blt_Init, Blt_SafeInit);

    /*
     * Initialize the console only if we are running as an interactive
     * application.
     */
#if (TCL_VERSION_NUMBER >= _VERSION(8,2,0)) 
    if (consoleRequired) {
	if (Tk_CreateConsoleWindow(interp) == TCL_ERROR) {
	    goto error;
	}
    }
#else
    /*
     * Initialize the console only if we are running as an interactive
     * application.
     */
    if (TkConsoleInit(interp) == TCL_ERROR) {
	goto error;
    }
#endif /* TCL_VERSION_NUMBER >= 8.2.0 */
    Tcl_SetVar(interp, "tcl_rcFileName", "~/wishrc.tcl", TCL_GLOBAL_ONLY);
    return TCL_OK;

  error:
    /* WishPanic(Tcl_GetStringResult(interp)); */
    return TCL_ERROR;
}

#endif /* TCL_ONLY */