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SDL_win32_main.c

/*
    SDL_main.c, placed in the public domain by Sam Lantinga  4/13/98

    The WinMain function -- calls your program's main() function
*/

#define NO_STDIO_REDIRECT

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

#include <windows.h>
#include <malloc.h>                     /* For _alloca() */

#ifdef _WIN32_WCE
# define DIR_SEPERATOR TEXT("\\")
# undef _getcwd
# define _getcwd(str,len)       wcscpy(str,TEXT(""))
# define setbuf(f,b)
# define setvbuf(w,x,y,z)
# define fopen          _wfopen
# define freopen        _wfreopen
# define remove(x)      DeleteFile(x)
# define strcat         wcscat
#else
# define DIR_SEPERATOR TEXT("/")
# include <direct.h>
#endif

/* Include the SDL main definition header */
#include "SDL.h"
#include "SDL_main.h"

#ifdef main
# ifndef _WIN32_WCE_EMULATION
#  undef main
# endif /* _WIN32_WCE_EMULATION */
#endif /* main */

/* The standard output files */
#define STDOUT_FILE     TEXT("stdout.txt")
#define STDERR_FILE     TEXT("stderr.txt")

#ifndef NO_STDIO_REDIRECT
# ifdef _WIN32_WCE
  static wchar_t stdoutPath[MAX_PATH];
  static wchar_t stderrPath[MAX_PATH];
# else
  static char stdoutPath[MAX_PATH];
  static char stderrPath[MAX_PATH];
# endif
#endif

#if defined(_WIN32_WCE) && _WIN32_WCE < 300
/* seems to be undefined in Win CE although in online help */
#define isspace(a) (((CHAR)a == ' ') || ((CHAR)a == '\t'))

/* seems to be undefined in Win CE although in online help */
char *strrchr(char *str, int c)
{
        char *p;

        /* Skip to the end of the string */
        p=str;
        while (*p)
                p++;

        /* Look for the given character */
        while ( (p >= str) && (*p != (CHAR)c) )
                p--;

        /* Return NULL if character not found */
        if ( p < str ) {
                p = NULL;
        }
        return p;
}
#endif /* _WIN32_WCE < 300 */

/* Parse a command line buffer into arguments */
static int ParseCommandLine(char *cmdline, char **argv)
{
        char *bufp;
        int argc;

        argc = 0;
        for ( bufp = cmdline; *bufp; ) {
                /* Skip leading whitespace */
                while ( isspace(*bufp) ) {
                        ++bufp;
                }
                /* Skip over argument */
                if ( *bufp == '"' ) {
                        ++bufp;
                        if ( *bufp ) {
                                if ( argv ) {
                                        argv[argc] = bufp;
                                }
                                ++argc;
                        }
                        /* Skip over word */
                        while ( *bufp && (*bufp != '"') ) {
                                ++bufp;
                        }
                } else {
                        if ( *bufp ) {
                                if ( argv ) {
                                        argv[argc] = bufp;
                                }
                                ++argc;
                        }
                        /* Skip over word */
                        while ( *bufp && ! isspace(*bufp) ) {
                                ++bufp;
                        }
                }
                if ( *bufp ) {
                        if ( argv ) {
                                *bufp = '\0';
                        }
                        ++bufp;
                }
        }
        if ( argv ) {
                argv[argc] = NULL;
        }
        return(argc);
}

/* Show an error message */
static void ShowError(const char *title, const char *message)
{
/* If USE_MESSAGEBOX is defined, you need to link with user32.lib */
#ifdef USE_MESSAGEBOX
        MessageBox(NULL, message, title, MB_ICONEXCLAMATION|MB_OK);
#else
        fprintf(stderr, "%s: %s\n", title, message);
#endif
}

/* Pop up an out of memory message, returns to Windows */
static BOOL OutOfMemory(void)
{
        ShowError("Fatal Error", "Out of memory - aborting");
        return FALSE;
}

/* Remove the output files if there was no output written */
static void __cdecl cleanup_output(void)
{
#ifndef NO_STDIO_REDIRECT
        FILE *file;
        int empty;
#endif

        /* Flush the output in case anything is queued */
        fclose(stdout);
        fclose(stderr);

#ifndef NO_STDIO_REDIRECT
        /* See if the files have any output in them */
        if ( stdoutPath[0] ) {
                file = fopen(stdoutPath, TEXT("rb"));
                if ( file ) {
                        empty = (fgetc(file) == EOF) ? 1 : 0;
                        fclose(file);
                        if ( empty ) {
                                remove(stdoutPath);
                        }
                }
        }
        if ( stderrPath[0] ) {
                file = fopen(stderrPath, TEXT("rb"));
                if ( file ) {
                        empty = (fgetc(file) == EOF) ? 1 : 0;
                        fclose(file);
                        if ( empty ) {
                                remove(stderrPath);
                        }
                }
        }
#endif
}

#if defined(_MSC_VER) && !defined(_WIN32_WCE)
/* The VC++ compiler needs main defined */
#define console_main main
#endif

/* This is where execution begins [console apps] */
int console_main(int argc, char *argv[])
{
        int n;
        char *bufp, *appname;

        /* Get the class name from argv[0] */
        appname = argv[0];
        if ( (bufp=strrchr(argv[0], '\\')) != NULL ) {
                appname = bufp+1;
        } else
        if ( (bufp=strrchr(argv[0], '/')) != NULL ) {
                appname = bufp+1;
        }

        if ( (bufp=strrchr(appname, '.')) == NULL )
                n = strlen(appname);
        else
                n = (bufp-appname);

        bufp = (char *)alloca(n+1);
        if ( bufp == NULL ) {
                return OutOfMemory();
        }
        strncpy(bufp, appname, n);
        bufp[n] = '\0';
        appname = bufp;

        /* Load SDL dynamic link library */
        if ( SDL_Init(SDL_INIT_NOPARACHUTE) < 0 ) {
                ShowError("WinMain() error", SDL_GetError());
                return(FALSE);
        }
        atexit(cleanup_output);
        atexit(SDL_Quit);

#ifndef DISABLE_VIDEO
#if 0
        /* Create and register our class *
           DJM: If we do this here, the user nevers gets a chance to
           putenv(SDL_WINDOWID).  This is already called later by
           the (DIB|DX5)_CreateWindow function, so it should be
           safe to comment it out here.
        if ( SDL_RegisterApp(appname, CS_BYTEALIGNCLIENT, 
                             GetModuleHandle(NULL)) < 0 ) {
                ShowError("WinMain() error", SDL_GetError());
                exit(1);
        }*/
#else
        /* Sam:
           We still need to pass in the application handle so that
           DirectInput will initialize properly when SDL_RegisterApp()
           is called later in the video initialization.
         */
        SDL_SetModuleHandle(GetModuleHandle(NULL));
#endif /* 0 */
#endif /* !DISABLE_VIDEO */

        /* Run the application main() code */
        SDL_main(argc, argv);

        /* Exit cleanly, calling atexit() functions */
        exit(0);

        /* Hush little compiler, don't you cry... */
        return(0);
}

/* This is where execution begins [windowed apps] */
#ifdef _WIN32_WCE
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPWSTR szCmdLine, int sw)
#else
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
#endif
{
        HINSTANCE handle;
        char **argv;
        int argc;
        char *cmdline;
#ifdef _WIN32_WCE
        wchar_t *bufp;
        int nLen;
#else
        char *bufp;
#endif
#ifndef NO_STDIO_REDIRECT
        FILE *newfp;
#endif

        /* Start up DDHELP.EXE before opening any files, so DDHELP doesn't
           keep them open.  This is a hack.. hopefully it will be fixed 
           someday.  DDHELP.EXE starts up the first time DDRAW.DLL is loaded.
         */
        handle = LoadLibrary(TEXT("DDRAW.DLL"));
        if ( handle != NULL ) {
                FreeLibrary(handle);
        }

#ifndef NO_STDIO_REDIRECT
        _getcwd( stdoutPath, sizeof( stdoutPath ) );
        strcat( stdoutPath, DIR_SEPERATOR STDOUT_FILE );
    
        /* Redirect standard input and standard output */
        newfp = freopen(stdoutPath, TEXT("w"), stdout);

#ifndef _WIN32_WCE
        if ( newfp == NULL ) {        /* This happens on NT */
#if !defined(stdout)
                stdout = fopen(stdoutPath, TEXT("w"));
#else
                newfp = fopen(stdoutPath, TEXT("w"));
                if ( newfp ) {
                        *stdout = *newfp;
                }
#endif
        }
#endif /* _WIN32_WCE */

        _getcwd( stderrPath, sizeof( stderrPath ) );
        strcat( stderrPath, DIR_SEPERATOR STDERR_FILE );

        newfp = freopen(stderrPath, TEXT("w"), stderr);
#ifndef _WIN32_WCE
        if ( newfp == NULL ) {        /* This happens on NT */
#if !defined(stderr)
                stderr = fopen(stderrPath, TEXT("w"));
#else
                newfp = fopen(stderrPath, TEXT("w"));
                if ( newfp ) {
                        *stderr = *newfp;
                }
#endif
        }
#endif /* _WIN32_WCE */

        setvbuf(stdout, NULL, _IOLBF, BUFSIZ);        /* Line buffered */
        setbuf(stderr, NULL);                        /* No buffering */
#endif /* !NO_STDIO_REDIRECT */

#ifdef _WIN32_WCE
        nLen = wcslen(szCmdLine)+128+1;
        bufp = (wchar_t *)alloca(nLen*2);
        wcscpy (bufp, TEXT("\""));
        GetModuleFileName(NULL, bufp+1, 128-3);
        wcscpy (bufp+wcslen(bufp), TEXT("\" "));
        wcsncpy(bufp+wcslen(bufp), szCmdLine,nLen-wcslen(bufp));
        nLen = wcslen(bufp)+1;
        cmdline = (char *)alloca(nLen);
        if ( cmdline == NULL ) {
                return OutOfMemory();
        }
        WideCharToMultiByte(CP_ACP, 0, bufp, -1, cmdline, nLen, NULL, NULL);
#else
        /* Grab the command line (use alloca() on Windows) */
        bufp = GetCommandLine();
        cmdline = (char *)alloca(strlen(bufp)+1);
        if ( cmdline == NULL ) {
                return OutOfMemory();
        }
        strcpy(cmdline, bufp);
#endif

        /* Parse it into argv and argc */
        argc = ParseCommandLine(cmdline, NULL);
        argv = (char **)alloca((argc+1)*(sizeof *argv));
        if ( argv == NULL ) {
                return OutOfMemory();
        }
        ParseCommandLine(cmdline, argv);

        /* Run the main program (after a little SDL initialization) */
        return(console_main(argc, argv));
}

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