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SDL_windows_main: use HeapAlloc/HeapFree for command line arguments

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If a developer uses SDL_SetMemoryFunctions, we can't rely on SDL_free()
working when SDL_main() returns.

Signed-off-by: Steven Noonan <steven@valvesoftware.com>
Signed-off-by: Sam Lantinga <slouken@libsdl.org>
This commit is contained in:
Steven Noonan 2021-04-22 17:24:05 -07:00 committed by Sam Lantinga
parent 17d8479d98
commit f1ad942a11
1 changed files with 17 additions and 4 deletions
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21
src/main/windows/SDL_windows_main.c
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@ -49,16 +49,29 @@ main_getcmdline(void)
return OutOfMemory();
}
/* Note that we need to be careful about how we allocate/free memory here.
* If the application calls SDL_SetMemoryFunctions(), we can't rely on
* SDL_free() to use the same allocator after SDL_main() returns.
*/
/* Parse it into argv and argc */
argv = (char **)SDL_calloc(argc + 1, sizeof(*argv));
argv = (char **)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (argc + 1) * sizeof(*argv));
if (!argv) {
return OutOfMemory();
}
for (i = 0; i < argc; ++i) {
argv[i] = WIN_StringToUTF8W(argvw[i]);
DWORD len;
char *arg = WIN_StringToUTF8W(argvw[i]);
if (!arg) {
return OutOfMemory();
}
len = (DWORD)SDL_strlen(arg);
argv[i] = (char *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len + 1);
if (!argv[i]) {
return OutOfMemory();
}
CopyMemory(argv[i], arg, len);
SDL_free(arg);
}
argv[i] = NULL;
LocalFree(argvw);
@ -70,9 +83,9 @@ main_getcmdline(void)
/* Free argv, to avoid memory leak */
for (i = 0; i < argc; ++i) {
SDL_free(argv[i]);
HeapFree(GetProcessHeap(), 0, argv[i]);
}
SDL_free(argv);
HeapFree(GetProcessHeap(), 0, argv);
return result;
}