mirror of https://github.com/encounter/SDL.git
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "./SDL_internal.h"
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#include "SDL.h"
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#include "./SDL_list.h"
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/* Push */
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int
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SDL_ListAdd(SDL_ListNode **head, void *ent)
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{
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SDL_ListNode *node = SDL_malloc(sizeof (*node));
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if (node == NULL) {
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return SDL_OutOfMemory();
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}
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node->entry = ent;
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node->next = *head;
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*head = node;
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return 0;
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}
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/* Pop from end as a FIFO (if add with SDL_ListAdd) */
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void
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SDL_ListPop(SDL_ListNode **head, void **ent)
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{
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SDL_ListNode **ptr = head;
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/* Invalid or empty */
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if (head == NULL || *head == NULL) {
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return;
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}
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while ((*ptr)->next) {
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ptr = &(*ptr)->next;
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}
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if (ent) {
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*ent = (*ptr)->entry;
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}
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SDL_free(*ptr);
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*ptr = NULL;
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}
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void
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SDL_ListRemove(SDL_ListNode **head, void *ent)
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{
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SDL_ListNode **ptr = head;
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while (*ptr) {
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if ((*ptr)->entry == ent) {
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SDL_ListNode *tmp = *ptr;
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*ptr = (*ptr)->next;
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SDL_free(tmp);
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return;
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}
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ptr = &(*ptr)->next;
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}
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}
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void
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SDL_ListClear(SDL_ListNode **head)
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{
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SDL_ListNode *l = *head;
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*head = NULL;
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while (l) {
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SDL_ListNode *tmp = l;
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l = l->next;
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SDL_free(tmp);
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}
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}
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/* vi: set ts=4 sw=4 expandtab: */
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