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/* |
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SDL - Simple DirectMedia Layer |
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Copyright (C) 1997-2011 Sam Lantinga |
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|
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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|
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
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#include "SDL_config.h" |
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|
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#include "SDL_hints.h" |
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|
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|
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/* Assuming there aren't many hints set and they aren't being queried in |
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critical performance paths, we'll just use a linked list here. |
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*/ |
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typedef struct SDL_Hint { |
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char *name; |
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char *value; |
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SDL_HintPriority priority; |
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struct SDL_Hint *next; |
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} SDL_Hint; |
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|
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static SDL_Hint *SDL_hints; |
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|
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|
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SDL_bool |
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SDL_SetHintWithPriority(const char *name, const char *value, |
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SDL_HintPriority priority) |
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{ |
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const char *env; |
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SDL_Hint *prev, *hint; |
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|
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if (!name || !value) { |
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return SDL_FALSE; |
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} |
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|
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env = SDL_getenv(name); |
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if (env && priority < SDL_HINT_OVERRIDE) { |
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return SDL_FALSE; |
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} |
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|
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prev = NULL; |
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for (hint = SDL_hints; hint; prev = hint, hint = hint->next) { |
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if (SDL_strcmp(name, hint->name) == 0) { |
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if (priority < hint->priority) { |
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return SDL_FALSE; |
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} |
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if (SDL_strcmp(hint->value, value) != 0) { |
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SDL_free(hint->value); |
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hint->value = SDL_strdup(value); |
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} |
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hint->priority = priority; |
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return SDL_TRUE; |
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} |
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} |
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|
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/* Couldn't find the hint, add a new one */ |
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hint = (SDL_Hint *)SDL_malloc(sizeof(*hint)); |
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if (!hint) { |
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return SDL_FALSE; |
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} |
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hint->name = SDL_strdup(name); |
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hint->value = SDL_strdup(value); |
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hint->priority = priority; |
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hint->next = SDL_hints; |
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SDL_hints = hint; |
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return SDL_TRUE; |
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} |
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|
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SDL_bool |
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SDL_SetHint(const char *name, const char *value) |
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{ |
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return SDL_SetHintWithPriority(name, value, SDL_HINT_NORMAL); |
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} |
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|
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const char * |
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SDL_GetHint(const char *name) |
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{ |
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const char *env; |
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SDL_Hint *hint; |
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|
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env = SDL_getenv(name); |
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for (hint = SDL_hints; hint; hint = hint->next) { |
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if (SDL_strcmp(name, hint->name) == 0) { |
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if (!env || hint->priority == SDL_HINT_OVERRIDE) { |
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return hint->value; |
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} |
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break; |
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} |
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} |
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return env; |
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} |
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|
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void SDL_ClearHints(void) |
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{ |
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SDL_Hint *hint; |
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|
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while (SDL_hints) { |
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hint = SDL_hints; |
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SDL_hints = hint->next; |
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|
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SDL_free(hint->name); |
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SDL_free(hint->value); |
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SDL_free(hint); |
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} |
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} |
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|
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/* vi: set ts=4 sw=4 expandtab: */ |