winMain.c

/* 
 * winMain.c --
 *
 *	Main entry point for cwsh.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 * Copyright (c) 1999 Christian Werner
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: winMain.c,v 1.1 1999/12/12 09:29:03 chw Exp chw $
 */

#include "ck.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#include <malloc.h>
#include <locale.h>

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

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


/*
 *----------------------------------------------------------------------
 *
 * 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, hPrevInstance, lpszCmdLine, nCmdShow)
    HINSTANCE hInstance;
    HINSTANCE hPrevInstance;
    LPSTR lpszCmdLine;
    int nCmdShow;
{
    char **argv, *p;
    int argc;
    char buffer[MAX_PATH];

    Tcl_SetPanicProc(CwshPanic);

    fclose(stdin);
    fclose(stdout);
    fclose(stderr);
    FreeConsole();
    if (!AllocConsole()) {
	CwshPanic("Error allocating console");
    }
    freopen("CONIN$", "r", stdin);
    freopen("CONOUT$", "w", stdout);
    freopen("CONOUT$", "w", stderr);

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

    setlocale(LC_ALL, "C");

    /*
     * 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);

    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 = '/';
	}
    }

    Ck_Main(argc, argv, Tcl_AppInit);
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_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 interp->result if an error occurs.
 *
 * Side effects:
 *	Depends on the startup script.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_AppInit(interp)
    Tcl_Interp *interp;		/* Interpreter for application. */
{
    if (Tcl_Init(interp) == TCL_ERROR) {
	goto error;
    }
    if (Ck_Init(interp) == TCL_ERROR) {
	goto error;
    }
    Tcl_StaticPackage(interp, "Ck", Ck_Init, (Tcl_PackageInitProc *) NULL);
    Tcl_SetVar(interp, "tcl_rcFileName", "~/.cwshrc", TCL_GLOBAL_ONLY);
    return TCL_OK;

error:
    CwshPanic(interp->result);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * CwshPanic --
 *
 *	Display a message and exit.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Exits the program.
 *
 *----------------------------------------------------------------------
 */

void
CwshPanic TCL_VARARGS_DEF(char *,arg1)
{
    va_list argList;
    char buf[1024];
    char *format;
    
    format = TCL_VARARGS_START(char *,arg1,argList);
    vsprintf(buf, format, argList);

    MessageBeep(MB_ICONEXCLAMATION);
    MessageBox(NULL, buf, "Fatal Error in CWSH",
	    MB_ICONSTOP | MB_OK | MB_TASKMODAL | MB_SETFOREGROUND);
#ifdef _MSC_VER
    DebugBreak();
#endif
    ExitProcess(1);
}
/*
 *-------------------------------------------------------------------------
 *
 * 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(argcPtr, argvPtr)
    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();

    /*
     * 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 (isspace(*p)) {
	    size++;
	    while (isspace(*p)) {
		p++;
	    }
	    if (*p == '\0') {
		break;
	    }
	}
    }
    argSpace = (char *) ckalloc((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 (isspace(*p)) {
	    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 && isspace(*p))) {
		break;
	    }
	    if (copy != 0) {
		*arg = *p;
		arg++;
	    }
	    p++;
        }
	*arg = '\0';
	argSpace = arg + 1;
    }
    argv[argc] = NULL;

    *argcPtr = argc;
    *argvPtr = argv;
}