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Added SDL_ResetHint() to reset a hint to the default value

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Resolves question of how to clear an override hint raised by @pionere in https://github.com/libsdl-org/SDL/pull/5309
This commit is contained in:
Sam Lantinga
2022-08-10 07:59:12 -07:00
parent 3119d58ff5
commit d4192850c1
7 changed files with 108 additions and 2 deletions
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37
src/SDL_hints.c
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@@ -96,6 +96,43 @@ SDL_SetHintWithPriority(const char *name, const char *value,
return SDL_TRUE;
}
SDL_bool
SDL_ResetHint(const char *name)
{
const char *env;
SDL_Hint *hint, *prev;
SDL_HintWatch *entry;
if (!name) {
return SDL_FALSE;
}
env = SDL_getenv(name);
for (prev = NULL, hint = SDL_hints; hint; prev = hint, hint = hint->next) {
if (SDL_strcmp(name, hint->name) == 0) {
if ((env == NULL && hint->value != NULL) ||
(env != NULL && hint->value == NULL) ||
(env && SDL_strcmp(env, hint->value) != 0)) {
for (entry = hint->callbacks; entry; ) {
/* Save the next entry in case this one is deleted */
SDL_HintWatch *next = entry->next;
entry->callback(entry->userdata, name, hint->value, env);
entry = next;
}
}
if (prev) {
prev->next = hint->next;
} else {
SDL_hints = hint->next;
}
SDL_free(hint->value);
SDL_free(hint);
return SDL_TRUE;
}
}
return SDL_FALSE;
}
SDL_bool
SDL_SetHint(const char *name, const char *value)
{