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80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* linked list helper functions.
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*
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* Copyright (C) 2003 Glenn McGrath
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* Copyright (C) 2005 Vladimir Oleynik
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* Copyright (C) 2005 Bernhard Fischer
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* Copyright (C) 2006 Rob Landley <rob@landley.net>
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*
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* Licensed under the GPL v2, see the file LICENSE in this tarball.
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*/
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#include <stdlib.h>
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#include "libbb.h"
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#ifdef L_llist_add_to
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/* Add data to the start of the linked list. */
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llist_t *llist_add_to(llist_t *old_head, char *new_item)
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{
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llist_t *new_head;
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new_head = xmalloc(sizeof(llist_t));
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new_head->data = new_item;
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new_head->link = old_head;
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return (new_head);
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}
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#endif
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#ifdef L_llist_add_to_end
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/* Add data to the end of the linked list. */
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llist_t *llist_add_to_end(llist_t *list_head, char *data)
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{
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llist_t *new_item;
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new_item = xmalloc(sizeof(llist_t));
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new_item->data = data;
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new_item->link = NULL;
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if (list_head == NULL) {
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list_head = new_item;
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} else {
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llist_t *tail = list_head;
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while (tail->link)
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tail = tail->link;
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tail->link = new_item;
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}
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return list_head;
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}
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#endif
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#ifdef L_llist_pop
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/* Remove first element from the list and return it */
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void *llist_pop(llist_t **head)
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{
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void *data;
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if(!*head) data = *head;
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else {
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void *next = (*head)->link;
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data = (*head)->data;
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free(*head);
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*head = next;
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}
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return data;
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}
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#endif
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#ifdef L_llist_free
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/* Recursively free all elements in the linked list. If freeit != NULL
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* call it on each datum in the list */
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void llist_free(llist_t *elm, void (*freeit)(void *data))
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{
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while (elm) {
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void *data = llist_pop(&elm);
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if (freeit) freeit(data);
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}
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}
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#endif
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