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SDL_hints.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2010 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_hints.h"
/* Assuming there aren't many hints set and they aren't being queried in
critical performance paths, we'll just use a linked list here.
*/
typedef struct SDL_Hint {
char *name;
char *value;
SDL_HintPriority priority;
struct SDL_Hint *next;
} SDL_Hint;
static SDL_Hint *SDL_hints;
SDL_bool
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SDL_SetHintWithPriority(const char *name, const char *value,
SDL_HintPriority priority)
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{
const char *env;
SDL_Hint *prev, *hint;
if (!name || !value) {
return SDL_FALSE;
}
env = SDL_getenv(name);
if (env && priority < SDL_HINT_OVERRIDE) {
return SDL_FALSE;
}
prev = NULL;
for (hint = SDL_hints; hint; prev = hint, hint = hint->next) {
if (SDL_strcmp(name, hint->name) == 0) {
if (priority < hint->priority) {
return SDL_FALSE;
}
if (SDL_strcmp(hint->value, value) != 0) {
SDL_free(hint->value);
hint->value = SDL_strdup(value);
}
hint->priority = priority;
return SDL_TRUE;
}
}
/* Couldn't find the hint, add a new one */
hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
if (!hint) {
return SDL_FALSE;
}
hint->name = SDL_strdup(name);
hint->value = SDL_strdup(value);
hint->priority = priority;
hint->next = SDL_hints;
SDL_hints = hint;
return SDL_TRUE;
}
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SDL_bool
SDL_SetHint(const char *name, const char *value)
{
return SDL_SetHintWithPriority(name, value, SDL_HINT_NORMAL);
}
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const char *
SDL_GetHint(const char *name)
{
const char *env;
SDL_Hint *hint;
env = SDL_getenv(name);
for (hint = SDL_hints; hint; hint = hint->next) {
if (SDL_strcmp(name, hint->name) == 0) {
if (!env || hint->priority == SDL_HINT_OVERRIDE) {
return hint->value;
}
break;
}
}
return env;
}
void SDL_ClearHints()
{
SDL_Hint *hint;
while (SDL_hints) {
hint = SDL_hints;
SDL_hints = hint->next;
SDL_free(hint->name);
SDL_free(hint->value);
SDL_free(hint);
}
}
/* vi: set ts=4 sw=4 expandtab: */