kc3-lang/SDL/src/SDL_hints.c

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• Hash : fb0ce375
  Author :
  Date : 2022-11-27T17:38:43
  

  Cleanup add brace (#6545) * Add braces after if conditions * More add braces after if conditions * Add braces after while() conditions * Fix compilation because of macro being modified * Add braces to for loop * Add braces after if/goto * Move comments up * Remove extra () in the 'return ...;' statements * More remove extra () in the 'return ...;' statements * More remove extra () in the 'return ...;' statements after merge * Fix inconsistent patterns are xxx == NULL vs !xxx * More "{}" for "if() break;" and "if() continue;" * More "{}" after if() short statement * More "{}" after "if () return;" statement * More fix inconsistent patterns are xxx == NULL vs !xxx * Revert some modificaion on SDL_RLEaccel.c * SDL_RLEaccel: no short statement * Cleanup 'if' where the bracket is in a new line * Cleanup 'while' where the bracket is in a new line * Cleanup 'for' where the bracket is in a new line * Cleanup 'else' where the bracket is in a new line (cherry picked from commit 6a2200823c66e53bd3cda4a25f0206b834392652 to reduce conflicts merging between SDL2 and SDL3)

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• src/SDL_hints.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "./SDL_internal.h"
  
  #include "SDL_hints.h"
  #include "SDL_error.h"
  #include "SDL_hints_c.h"
  
  
  /* Assuming there aren't many hints set and they aren't being queried in
     critical performance paths, we'll just use linked lists here.
   */
  typedef struct SDL_HintWatch {
      SDL_HintCallback callback;
      void *userdata;
      struct SDL_HintWatch *next;
  } SDL_HintWatch;
  
  typedef struct SDL_Hint {
      char *name;
      char *value;
      SDL_HintPriority priority;
      SDL_HintWatch *callbacks;
      struct SDL_Hint *next;
  } SDL_Hint;
  
  static SDL_Hint *SDL_hints;
  
  SDL_bool
  SDL_SetHintWithPriority(const char *name, const char *value,
                          SDL_HintPriority priority)
  {
      const char *env;
      SDL_Hint *hint;
      SDL_HintWatch *entry;
  
      if (name == NULL) {
          return SDL_FALSE;
      }
  
      env = SDL_getenv(name);
      if (env && priority < SDL_HINT_OVERRIDE) {
          return SDL_FALSE;
      }
  
      for (hint = SDL_hints; hint; hint = hint->next) {
          if (SDL_strcmp(name, hint->name) == 0) {
              if (priority < hint->priority) {
                  return SDL_FALSE;
              }
              if (hint->value != value &&
                  (value == NULL || !hint->value || SDL_strcmp(hint->value, 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, value);
                      entry = next;
                  }
                  SDL_free(hint->value);
                  hint->value = value ? SDL_strdup(value) : NULL;
              }
              hint->priority = priority;
              return SDL_TRUE;
          }
      }
  
      /* Couldn't find the hint, add a new one */
      hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
      if (hint == NULL) {
          return SDL_FALSE;
      }
      hint->name = SDL_strdup(name);
      hint->value = value ? SDL_strdup(value) : NULL;
      hint->priority = priority;
      hint->callbacks = NULL;
      hint->next = SDL_hints;
      SDL_hints = hint;
      return SDL_TRUE;
  }
  
  SDL_bool
  SDL_ResetHint(const char *name)
  {
      const char *env;
      SDL_Hint *hint;
      SDL_HintWatch *entry;
  
      if (name == NULL) {
          return SDL_FALSE;
      }
  
      env = SDL_getenv(name);
      for (hint = SDL_hints; hint; hint = hint->next) {
          if (SDL_strcmp(name, hint->name) == 0) {
              if ((env == NULL && hint->value != NULL) ||
                  (env != NULL && hint->value == NULL) ||
                  (env != NULL && 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;
                  }
              }
              SDL_free(hint->value);
              hint->value = NULL;
              hint->priority = SDL_HINT_DEFAULT;
              return SDL_TRUE;
          }
      }
      return SDL_FALSE;
  }
  
  void
  SDL_ResetHints(void)
  {
      const char *env;
      SDL_Hint *hint;
      SDL_HintWatch *entry;
  
      for (hint = SDL_hints; hint; hint = hint->next) {
          env = SDL_getenv(hint->name);
          if ((env == NULL && hint->value != NULL) ||
              (env != NULL && hint->value == NULL) ||
              (env != NULL && 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, hint->name, hint->value, env);
                  entry = next;
              }
          }
          SDL_free(hint->value);
          hint->value = NULL;
          hint->priority = SDL_HINT_DEFAULT;
      }
  }
  
  SDL_bool
  SDL_SetHint(const char *name, const char *value)
  {
      return SDL_SetHintWithPriority(name, value, SDL_HINT_NORMAL);
  }
  
  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 == NULL || hint->priority == SDL_HINT_OVERRIDE) {
                  return hint->value;
              }
              break;
          }
      }
      return env;
  }
  
  SDL_bool
  SDL_GetStringBoolean(const char *value, SDL_bool default_value)
  {
      if (value == NULL || !*value) {
          return default_value;
      }
      if (*value == '0' || SDL_strcasecmp(value, "false") == 0) {
          return SDL_FALSE;
      }
      return SDL_TRUE;
  }
  
  SDL_bool
  SDL_GetHintBoolean(const char *name, SDL_bool default_value)
  {
      const char *hint = SDL_GetHint(name);
      return SDL_GetStringBoolean(hint, default_value);
  }
  
  void
  SDL_AddHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
  {
      SDL_Hint *hint;
      SDL_HintWatch *entry;
      const char *value;
  
      if (name == NULL || !*name) {
          SDL_InvalidParamError("name");
          return;
      }
      if (!callback) {
          SDL_InvalidParamError("callback");
          return;
      }
  
      SDL_DelHintCallback(name, callback, userdata);
  
      entry = (SDL_HintWatch *)SDL_malloc(sizeof(*entry));
      if (entry == NULL) {
          SDL_OutOfMemory();
          return;
      }
      entry->callback = callback;
      entry->userdata = userdata;
  
      for (hint = SDL_hints; hint; hint = hint->next) {
          if (SDL_strcmp(name, hint->name) == 0) {
              break;
          }
      }
      if (hint == NULL) {
          /* Need to add a hint entry for this watcher */
          hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
          if (hint == NULL) {
              SDL_OutOfMemory();
              SDL_free(entry);
              return;
          }
          hint->name = SDL_strdup(name);
          if (!hint->name) {
              SDL_free(entry);
              SDL_free(hint);
              SDL_OutOfMemory();
              return;
          }
          hint->value = NULL;
          hint->priority = SDL_HINT_DEFAULT;
          hint->callbacks = NULL;
          hint->next = SDL_hints;
          SDL_hints = hint;
      }
  
      /* Add it to the callbacks for this hint */
      entry->next = hint->callbacks;
      hint->callbacks = entry;
  
      /* Now call it with the current value */
      value = SDL_GetHint(name);
      callback(userdata, name, value, value);
  }
  
  void
  SDL_DelHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
  {
      SDL_Hint *hint;
      SDL_HintWatch *entry, *prev;
  
      for (hint = SDL_hints; hint; hint = hint->next) {
          if (SDL_strcmp(name, hint->name) == 0) {
              prev = NULL;
              for (entry = hint->callbacks; entry; entry = entry->next) {
                  if (callback == entry->callback && userdata == entry->userdata) {
                      if (prev) {
                          prev->next = entry->next;
                      } else {
                          hint->callbacks = entry->next;
                      }
                      SDL_free(entry);
                      break;
                  }
                  prev = entry;
              }
              return;
          }
      }
  }
  
  void SDL_ClearHints(void)
  {
      SDL_Hint *hint;
      SDL_HintWatch *entry;
  
      while (SDL_hints) {
          hint = SDL_hints;
          SDL_hints = hint->next;
  
          SDL_free(hint->name);
          SDL_free(hint->value);
          for (entry = hint->callbacks; entry; ) {
              SDL_HintWatch *freeable = entry;
              entry = entry->next;
              SDL_free(freeable);
          }
          SDL_free(hint);
      }
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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