/*

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

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

*/

#include <stdio.h>

#include <string.h>

#include <ctype.h>

#include <stdlib.h>

#include <windows.h>

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

/* Include the SDL main definition header */

#include "SDL.h"

#include "SDL_main.h"

#ifdef main

#undef main

#endif

/* The standard output files */

#define STDOUT_FILE	"stdout.txt"

#define STDERR_FILE	"stderr.txt"

/* 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 cleanup_output(void)

{

	FILE *file;

	int empty;

	/* Flush the output in case anything is queued */

	fclose(stdout);

	fclose(stderr);

	/* See if the files have any output in them */

	file = fopen(STDOUT_FILE, "rb");

	if ( file ) {

		empty = (fgetc(file) == EOF) ? 1 : 0;

		fclose(file);

		if ( empty ) {

			remove(STDOUT_FILE);

		}

	}

	file = fopen(STDERR_FILE, "rb");

	if ( file ) {

		empty = (fgetc(file) == EOF) ? 1 : 0;

		fclose(file);

		if ( empty ) {

			remove(STDERR_FILE);

		}

	}

}

#ifdef _MSC_VER /* 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);

	if ( SDL_RegisterApp(appname, CS_BYTEALIGNCLIENT, 

	                     GetModuleHandle(NULL)) < 0 ) {

		ShowError("WinMain() error", SDL_GetError());

		exit(1);

	}

	SDL_main(argc, argv);

	/* Exit cleanly, calling atexit() functions */

	exit(0);

}

/* This is where execution begins [windowed apps] */

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)

{

	HINSTANCE handle;

	char **argv;

	int argc;

	char *cmdline;

	char *bufp;

#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("DDRAW.DLL");

	if ( handle != NULL ) {

		FreeLibrary(handle);

	}

#ifndef NO_STDIO_REDIRECT

	/* Redirect standard input and standard output */

	newfp = freopen(STDOUT_FILE, "w", stdout);

	if ( newfp == NULL ) {	/* This happens on NT */

#if !defined(stdout)

		stdout = fopen(STDOUT_FILE, "w");

#else

		newfp = fopen(STDOUT_FILE, "w");

		if ( newfp ) {

			*stdout = *newfp;

		}

#endif

	}

	newfp = freopen(STDERR_FILE, "w", stderr);

	if ( newfp == NULL ) {	/* This happens on NT */

#if !defined(stderr)

		stderr = fopen(STDERR_FILE, "w");

#else

		newfp = fopen(STDERR_FILE, "w");

		if ( newfp ) {

			*stderr = *newfp;

		}

#endif

	}

	setvbuf(stdout, NULL, _IOLBF, BUFSIZ);	/* Line buffered */

	setbuf(stderr, NULL);			/* No buffering */

#endif /* !NO_STDIO_REDIRECT */

	/* Grab the command line (use alloca() on Windows) */

	bufp = GetCommandLine();

	cmdline = (char *)alloca(strlen(bufp)+1);

	if ( cmdline == NULL ) {

		return OutOfMemory();

	}

	strcpy(cmdline, bufp);

	/* 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));

}