SDL  2.0
SDL_windows_main.c
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1 /*
2  SDL_windows_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 #include "SDL_config.h"
7 
8 #ifdef __WIN32__
9 
10 /* Include this so we define UNICODE properly */
11 #include "../../core/windows/SDL_windows.h"
12 
13 /* Include the SDL main definition header */
14 #include "SDL.h"
15 #include "SDL_main.h"
16 
17 #ifdef main
18 # undef main
19 #endif /* main */
20 
21 static void
22 UnEscapeQuotes(char *arg)
23 {
24  char *last = NULL;
25 
26  while (*arg) {
27  if (*arg == '"' && (last != NULL && *last == '\\')) {
28  char *c_curr = arg;
29  char *c_last = last;
30 
31  while (*c_curr) {
32  *c_last = *c_curr;
33  c_last = c_curr;
34  c_curr++;
35  }
36  *c_last = '\0';
37  }
38  last = arg;
39  arg++;
40  }
41 }
42 
43 /* Parse a command line buffer into arguments */
44 static int
45 ParseCommandLine(char *cmdline, char **argv)
46 {
47  char *bufp;
48  char *lastp = NULL;
49  int argc, last_argc;
50 
51  argc = last_argc = 0;
52  for (bufp = cmdline; *bufp;) {
53  /* Skip leading whitespace */
54  while (*bufp == ' ' || *bufp == '\t') {
55  ++bufp;
56  }
57  /* Skip over argument */
58  if (*bufp == '"') {
59  ++bufp;
60  if (*bufp) {
61  if (argv) {
62  argv[argc] = bufp;
63  }
64  ++argc;
65  }
66  /* Skip over word */
67  lastp = bufp;
68  while (*bufp && (*bufp != '"' || *lastp == '\\')) {
69  lastp = bufp;
70  ++bufp;
71  }
72  } else {
73  if (*bufp) {
74  if (argv) {
75  argv[argc] = bufp;
76  }
77  ++argc;
78  }
79  /* Skip over word */
80  while (*bufp && (*bufp != ' ' && *bufp != '\t')) {
81  ++bufp;
82  }
83  }
84  if (*bufp) {
85  if (argv) {
86  *bufp = '\0';
87  }
88  ++bufp;
89  }
90 
91  /* Strip out \ from \" sequences */
92  if (argv && last_argc != argc) {
93  UnEscapeQuotes(argv[last_argc]);
94  }
95  last_argc = argc;
96  }
97  if (argv) {
98  argv[argc] = NULL;
99  }
100  return (argc);
101 }
102 
103 /* Pop up an out of memory message, returns to Windows */
104 static BOOL
105 OutOfMemory(void)
106 {
107  SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal Error", "Out of memory - aborting", NULL);
108  return FALSE;
109 }
110 
111 #if defined(_MSC_VER)
112 /* The VC++ compiler needs main/wmain defined */
113 # define console_ansi_main main
114 # if UNICODE
115 # define console_wmain wmain
116 # endif
117 #endif
118 
119 /* Gets the arguments with GetCommandLine, converts them to argc and argv
120  and calls SDL_main */
121 static int
122 main_getcmdline()
123 {
124  char **argv;
125  int argc;
126  char *cmdline = NULL;
127  int retval = 0;
128  int cmdalloc = 0;
129  const TCHAR *text = GetCommandLine();
130  const TCHAR *ptr;
131  int argc_guess = 2; /* space for NULL and initial argument. */
132  int rc;
133 
134  /* make a rough guess of command line arguments. Overestimates if there
135  are quoted things. */
136  for (ptr = text; *ptr; ptr++) {
137  if ((*ptr == ' ') || (*ptr == '\t')) {
138  argc_guess++;
139  }
140  }
141 
142 #if UNICODE
143  rc = WideCharToMultiByte(CP_UTF8, 0, text, -1, NULL, 0, NULL, NULL);
144  if (rc > 0) {
145  cmdalloc = rc + (sizeof (char *) * argc_guess);
146  argv = (char **) VirtualAlloc(NULL, cmdalloc, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
147  if (argv) {
148  int rc2;
149  cmdline = (char *) (argv + argc_guess);
150  rc2 = WideCharToMultiByte(CP_UTF8, 0, text, -1, cmdline, rc, NULL, NULL);
151  SDL_assert(rc2 == rc);
152  }
153  }
154 #else
155  /* !!! FIXME: are these in the system codepage? We need to convert to UTF-8. */
156  rc = ((int) SDL_strlen(text)) + 1;
157  cmdalloc = rc + (sizeof (char *) * argc_guess);
158  argv = (char **) VirtualAlloc(NULL, cmdalloc, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
159  if (argv) {
160  cmdline = (char *) (argv + argc_guess);
161  SDL_strcpy(cmdline, text);
162  }
163 #endif
164  if (cmdline == NULL) {
165  return OutOfMemory();
166  }
167 
168  /* Parse it into argv and argc */
169  SDL_assert(ParseCommandLine(cmdline, NULL) <= argc_guess);
170  argc = ParseCommandLine(cmdline, argv);
171 
173 
174  /* Run the application main() code */
175  retval = SDL_main(argc, argv);
176 
177  VirtualFree(argv, cmdalloc, MEM_DECOMMIT);
178  VirtualFree(argv, 0, MEM_RELEASE);
179 
180  return retval;
181 }
182 
183 /* This is where execution begins [console apps, ansi] */
184 int
185 console_ansi_main(int argc, char *argv[])
186 {
187  return main_getcmdline();
188 }
189 
190 
191 #if UNICODE
192 /* This is where execution begins [console apps, unicode] */
193 int
194 console_wmain(int argc, wchar_t *wargv[], wchar_t *wenvp)
195 {
196  return main_getcmdline();
197 }
198 #endif
199 
200 /* This is where execution begins [windowed apps] */
201 int WINAPI
202 WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
203 {
204  return main_getcmdline();
205 }
206 
207 #endif /* __WIN32__ */
208 
209 /* vi: set ts=4 sw=4 expandtab: */
SDL.h
SDL_SetMainReady
#define SDL_SetMainReady
Definition: SDL_dynapi_overrides.h:242
SDL_main.h
NULL
#define NULL
Definition: begin_code.h:167
SDL_ShowSimpleMessageBox
#define SDL_ShowSimpleMessageBox
Definition: SDL_dynapi_overrides.h:244
WinMain
int CALLBACK WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
Definition: SDL_winrt_main_NonXAML.cpp:51
retval
SDL_bool retval
Definition: testgamecontroller.c:65
text
static char text[MAX_TEXT_LENGTH]
Definition: testime.c:47
SDL_MESSAGEBOX_ERROR
Definition: SDL_messagebox.h:39
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_strlen
#define SDL_strlen
Definition: SDL_dynapi_overrides.h:393
SDL_main
SDLMAIN_DECLSPEC int SDL_main(int argc, char *argv[])
SDL_config.h
FALSE
#define FALSE
Definition: edid-parse.c:34