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/* | ||
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" | ||
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#include "SDL.h" | ||
#include "./SDL_list.h" | ||
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/* Push */ | ||
int | ||
SDL_ListAdd(SDL_ListNode **head, void *ent) | ||
{ | ||
SDL_ListNode *node = SDL_malloc(sizeof (*node)); | ||
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if (node == NULL) { | ||
return SDL_OutOfMemory(); | ||
} | ||
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node->entry = ent; | ||
node->next = *head; | ||
*head = node; | ||
return 0; | ||
} | ||
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/* Pop from end as a FIFO (if add with SDL_ListAdd) */ | ||
void | ||
SDL_ListPop(SDL_ListNode **head, void **ent) | ||
{ | ||
SDL_ListNode **ptr = head; | ||
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/* Invalid or empty */ | ||
if (head == NULL || *head == NULL) { | ||
return; | ||
} | ||
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while ((*ptr)->next) { | ||
ptr = &(*ptr)->next; | ||
} | ||
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if (ent) { | ||
*ent = (*ptr)->entry; | ||
} | ||
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SDL_free(*ptr); | ||
*ptr = NULL; | ||
} | ||
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void | ||
SDL_ListRemove(SDL_ListNode **head, void *ent) | ||
{ | ||
SDL_ListNode **ptr = head; | ||
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while (*ptr) { | ||
if ((*ptr)->entry == ent) { | ||
SDL_ListNode *tmp = *ptr; | ||
*ptr = (*ptr)->next; | ||
SDL_free(tmp); | ||
return; | ||
} | ||
ptr = &(*ptr)->next; | ||
} | ||
} | ||
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void | ||
SDL_ListClear(SDL_ListNode **head) | ||
{ | ||
SDL_ListNode *l = *head; | ||
*head = NULL; | ||
while (l) { | ||
SDL_ListNode *tmp = l; | ||
l = l->next; | ||
SDL_free(tmp); | ||
} | ||
} | ||
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/* vi: set ts=4 sw=4 expandtab: */ |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,39 @@ | ||
/* | ||
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. | ||
*/ | ||
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#ifndef SDL_list_h_ | ||
#define SDL_list_h_ | ||
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typedef struct SDL_ListNode | ||
{ | ||
void *entry; | ||
struct SDL_ListNode *next; | ||
} SDL_ListNode; | ||
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int SDL_ListAdd(SDL_ListNode **head, void *ent); | ||
void SDL_ListPop(SDL_ListNode **head, void **ent); | ||
void SDL_ListRemove(SDL_ListNode **head, void *ent); | ||
void SDL_ListClear(SDL_ListNode **head); | ||
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#endif /* SDL_list_h_ */ | ||
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/* vi: set ts=4 sw=4 expandtab: */ |