src/main/win32/SDL_main.c
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FUNCTIONS
This source file includes following functions.
- ParseCommandLine
- ShowError
- OutOfMemory
- cleanup_output
- console_main
- WinMain
1 /*
2 SDL_main.c, placed in the public domain by Sam Lantinga 4/13/98
3
4 The WinMain function -- calls your program's main() function
5 */
6
7 #include <stdio.h>
8 #include <string.h>
9 #include <ctype.h>
10 #include <stdlib.h>
11
12 #include <windows.h>
13 #include <malloc.h> /* For _alloca() */
14
15 /* Include the SDL main definition header */
16 #include "SDL.h"
17 #include "SDL_main.h"
18 #ifdef main
19 #undef main
20 #endif
21
22 /* The standard output files */
23 #define STDOUT_FILE "stdout.txt"
24 #define STDERR_FILE "stderr.txt"
25
26 /* Parse a command line buffer into arguments */
27 static int ParseCommandLine(char *cmdline, char **argv)
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28 {
29 char *bufp;
30 int argc;
31
32 argc = 0;
33 for ( bufp = cmdline; *bufp; ) {
34 /* Skip leading whitespace */
35 while ( isspace(*bufp) ) {
36 ++bufp;
37 }
38 /* Skip over argument */
39 if ( *bufp == '"' ) {
40 ++bufp;
41 if ( *bufp ) {
42 if ( argv ) {
43 argv[argc] = bufp;
44 }
45 ++argc;
46 }
47 /* Skip over word */
48 while ( *bufp && (*bufp != '"') ) {
49 ++bufp;
50 }
51 } else {
52 if ( *bufp ) {
53 if ( argv ) {
54 argv[argc] = bufp;
55 }
56 ++argc;
57 }
58 /* Skip over word */
59 while ( *bufp && ! isspace(*bufp) ) {
60 ++bufp;
61 }
62 }
63 if ( *bufp ) {
64 if ( argv ) {
65 *bufp = '\0';
66 }
67 ++bufp;
68 }
69 }
70 if ( argv ) {
71 argv[argc] = NULL;
72 }
73 return(argc);
74 }
75
76 /* Show an error message */
77 static void ShowError(const char *title, const char *message)
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78 {
79 /* If USE_MESSAGEBOX is defined, you need to link with user32.lib */
80 #ifdef USE_MESSAGEBOX
81 MessageBox(NULL, message, title, MB_ICONEXCLAMATION|MB_OK);
82 #else
83 fprintf(stderr, "%s: %s\n", title, message);
84 #endif
85 }
86
87 /* Pop up an out of memory message, returns to Windows */
88 static BOOL OutOfMemory(void)
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89 {
90 ShowError("Fatal Error", "Out of memory - aborting");
91 return FALSE;
92 }
93
94 /* Remove the output files if there was no output written */
95 static void cleanup_output(void)
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96 {
97 FILE *file;
98 int empty;
99
100 /* Flush the output in case anything is queued */
101 fclose(stdout);
102 fclose(stderr);
103
104 /* See if the files have any output in them */
105 file = fopen(STDOUT_FILE, "rb");
106 if ( file ) {
107 empty = (fgetc(file) == EOF) ? 1 : 0;
108 fclose(file);
109 if ( empty ) {
110 remove(STDOUT_FILE);
111 }
112 }
113 file = fopen(STDERR_FILE, "rb");
114 if ( file ) {
115 empty = (fgetc(file) == EOF) ? 1 : 0;
116 fclose(file);
117 if ( empty ) {
118 remove(STDERR_FILE);
119 }
120 }
121 }
122
123 #ifdef _MSC_VER /* The VC++ compiler needs main defined */
124 #define console_main main
125 #endif
126
127 /* This is where execution begins [console apps] */
128 int console_main(int argc, char *argv[])
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129 {
130 int n;
131 char *bufp, *appname;
132
133 /* Get the class name from argv[0] */
134 appname = argv[0];
135 if ( (bufp=strrchr(argv[0], '\\')) != NULL ) {
136 appname = bufp+1;
137 } else
138 if ( (bufp=strrchr(argv[0], '/')) != NULL ) {
139 appname = bufp+1;
140 }
141
142 if ( (bufp=strrchr(appname, '.')) == NULL )
143 n = strlen(appname);
144 else
145 n = (bufp-appname);
146
147 bufp = (char *)alloca(n+1);
148 if ( bufp == NULL ) {
149 return OutOfMemory();
150 }
151 strncpy(bufp, appname, n);
152 bufp[n] = '\0';
153 appname = bufp;
154
155 /* Load SDL dynamic link library */
156 if ( SDL_Init(SDL_INIT_NOPARACHUTE) < 0 ) {
157 ShowError("WinMain() error", SDL_GetError());
158 return(FALSE);
159 }
160 atexit(cleanup_output);
161 atexit(SDL_Quit);
162
163 /* Create and register our class, then run main code */
164 if ( SDL_RegisterApp(appname, CS_BYTEALIGNCLIENT,
165 GetModuleHandle(NULL)) < 0 ) {
166 ShowError("WinMain() error", SDL_GetError());
167 exit(1);
168 }
169 SDL_main(argc, argv);
170
171 /* Exit cleanly, calling atexit() functions */
172 exit(0);
173 }
174
175 /* This is where execution begins [windowed apps] */
176 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
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177 {
178 HINSTANCE handle;
179 char **argv;
180 int argc;
181 char *cmdline;
182 char *bufp;
183 #ifndef NO_STDIO_REDIRECT
184 FILE *newfp;
185 #endif
186
187 /* Start up DDHELP.EXE before opening any files, so DDHELP doesn't
188 keep them open. This is a hack.. hopefully it will be fixed
189 someday. DDHELP.EXE starts up the first time DDRAW.DLL is loaded.
190 */
191 handle = LoadLibrary("DDRAW.DLL");
192 if ( handle != NULL ) {
193 FreeLibrary(handle);
194 }
195
196 #ifndef NO_STDIO_REDIRECT
197 /* Redirect standard input and standard output */
198 newfp = freopen(STDOUT_FILE, "w", stdout);
199 if ( newfp == NULL ) { /* This happens on NT */
200 #if !defined(stdout)
201 stdout = fopen(STDOUT_FILE, "w");
202 #else
203 newfp = fopen(STDOUT_FILE, "w");
204 if ( newfp ) {
205 *stdout = *newfp;
206 }
207 #endif
208 }
209 newfp = freopen(STDERR_FILE, "w", stderr);
210 if ( newfp == NULL ) { /* This happens on NT */
211 #if !defined(stderr)
212 stderr = fopen(STDERR_FILE, "w");
213 #else
214 newfp = fopen(STDERR_FILE, "w");
215 if ( newfp ) {
216 *stderr = *newfp;
217 }
218 #endif
219 }
220 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); /* Line buffered */
221 setbuf(stderr, NULL); /* No buffering */
222 #endif /* !NO_STDIO_REDIRECT */
223
224 /* Grab the command line (use alloca() on Windows) */
225 bufp = GetCommandLine();
226 cmdline = (char *)alloca(strlen(bufp)+1);
227 if ( cmdline == NULL ) {
228 return OutOfMemory();
229 }
230 strcpy(cmdline, bufp);
231
232 /* Parse it into argv and argc */
233 argc = ParseCommandLine(cmdline, NULL);
234 argv = (char **)alloca((argc+1)*(sizeof *argv));
235 if ( argv == NULL ) {
236 return OutOfMemory();
237 }
238 ParseCommandLine(cmdline, argv);
239
240 /* Run the main program (after a little SDL initialization) */
241 return(console_main(argc, argv));
242 }