-#include <stdlib.h>
-#include <string.h>
-#include "unarchive.h"
+/* vi: set sw=4 ts=4: */
+/*
+ * linked list helper functions.
+ *
+ * Copyright (C) 2003 Glenn McGrath
+ * Copyright (C) 2005 Vladimir Oleynik
+ * Copyright (C) 2005 Bernhard Reutner-Fischer
+ * Copyright (C) 2006 Rob Landley <rob@landley.net>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
#include "libbb.h"
-#ifdef L_llist_add_to
-extern llist_t *llist_add_to(llist_t *old_head, char *new_item)
+/* Add data to the start of the linked list. */
+void FAST_FUNC llist_add_to(llist_t **old_head, void *data)
{
- llist_t *new_head;
+ llist_t *new_head = xmalloc(sizeof(llist_t));
- new_head = xmalloc(sizeof(llist_t));
- new_head->data = new_item;
- new_head->link = old_head;
+ new_head->data = data;
+ new_head->link = *old_head;
+ *old_head = new_head;
+}
- return (new_head);
+/* Add data to the end of the linked list. */
+void FAST_FUNC llist_add_to_end(llist_t **list_head, void *data)
+{
+ while (*list_head)
+ list_head = &(*list_head)->link;
+ *list_head = xzalloc(sizeof(llist_t));
+ (*list_head)->data = data;
+ /*(*list_head)->link = NULL;*/
}
-#endif
-#ifdef L_llist_add_to_end
-extern llist_t *llist_add_to_end(llist_t *list_head, char *data)
+/* Remove first element from the list and return it */
+void* FAST_FUNC llist_pop(llist_t **head)
{
- llist_t *new_item, *tmp, *prev;
+ void *data = NULL;
+ llist_t *temp = *head;
- new_item = xmalloc(sizeof(llist_t));
- new_item->data = data;
- new_item->link = NULL;
+ if (temp) {
+ data = temp->data;
+ *head = temp->link;
+ free(temp);
+ }
+ return data;
+}
- prev = NULL;
- tmp = list_head;
- while (tmp) {
- prev = tmp;
- tmp = tmp->link;
+/* Unlink arbitrary given element from the list */
+void FAST_FUNC llist_unlink(llist_t **head, llist_t *elm)
+{
+ if (!elm)
+ return;
+ while (*head) {
+ if (*head == elm) {
+ *head = (*head)->link;
+ break;
+ }
+ head = &(*head)->link;
}
- if (prev) {
- prev->link = new_item;
- } else {
- list_head = new_item;
+}
+
+/* Recursively free all elements in the linked list. If freeit != NULL
+ * call it on each datum in the list */
+void FAST_FUNC llist_free(llist_t *elm, void (*freeit)(void *data))
+{
+ while (elm) {
+ void *data = llist_pop(&elm);
+
+ if (freeit)
+ freeit(data);
}
+}
+
+/* Reverse list order. */
+llist_t* FAST_FUNC llist_rev(llist_t *list)
+{
+ llist_t *rev = NULL;
+
+ while (list) {
+ llist_t *next = list->link;
- return (list_head);
+ list->link = rev;
+ rev = list;
+ list = next;
+ }
+ return rev;
}
-#endif
+llist_t* FAST_FUNC llist_find_str(llist_t *list, const char *str)
+{
+ while (list) {
+ if (strcmp(list->data, str) == 0)
+ break;
+ list = list->link;
+ }
+ return list;
+}