mirror of
https://github.com/sheumann/hush.git
synced 2024-11-09 02:09:01 +00:00
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* linked list helper functions.
|
|
*
|
|
* Copyright (C) 2003 Glenn McGrath
|
|
* Copyright (C) 2005 Vladimir Oleynik
|
|
* Copyright (C) 2005 Bernhard Fischer
|
|
*
|
|
* Licensed under the GPL v2, see the file LICENSE in this tarball.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include "libbb.h"
|
|
|
|
#ifdef L_llist_add_to
|
|
/* Add data to the start of the linked list. */
|
|
llist_t *llist_add_to(llist_t *old_head, char *new_item)
|
|
{
|
|
llist_t *new_head;
|
|
|
|
new_head = xmalloc(sizeof(llist_t));
|
|
new_head->data = new_item;
|
|
new_head->link = old_head;
|
|
|
|
return (new_head);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_llist_add_to_end
|
|
/* Add data to the end of the linked list. */
|
|
llist_t *llist_add_to_end(llist_t *list_head, char *data)
|
|
{
|
|
llist_t *new_item;
|
|
|
|
new_item = xmalloc(sizeof(llist_t));
|
|
new_item->data = data;
|
|
new_item->link = NULL;
|
|
|
|
if (list_head == NULL) {
|
|
list_head = new_item;
|
|
} else {
|
|
llist_t *tail = list_head;
|
|
while (tail->link)
|
|
tail = tail->link;
|
|
tail->link = new_item;
|
|
}
|
|
return list_head;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_llist_pop
|
|
/* Remove first element from the list and return it */
|
|
void *llist_pop(llist_t **head)
|
|
{
|
|
void *data;
|
|
|
|
if(!*head) data = *head;
|
|
else {
|
|
void *next = (*head)->link;
|
|
data = (*head)->data;
|
|
*head = (*head)->link;
|
|
free(next);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_llist_free
|
|
/* Recursively free all elements in the linked list. If freeit != NULL
|
|
* call it on each datum in the list */
|
|
void llist_free(llist_t *elm, void (*freeit)(void *data))
|
|
{
|
|
while (elm) {
|
|
void *data = llist_pop(&elm);
|
|
if (freeit) freeit(data);
|
|
}
|
|
}
|
|
#endif
|