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-rw-r--r--lib/libalpm/list.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/lib/libalpm/list.c b/lib/libalpm/list.c
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+++ b/lib/libalpm/list.c
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+/*
+ * list.c
+ *
+ * Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+#include "config.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+/* pacman */
+#include "list.h"
+
+PMList* pm_list_new()
+{
+ PMList *list = NULL;
+
+ list = (PMList *)malloc(sizeof(PMList));
+ if(list == NULL) {
+ return(NULL);
+ }
+ list->data = NULL;
+ list->prev = NULL;
+ list->next = NULL;
+ return(list);
+}
+
+void pm_list_free(PMList *list)
+{
+ if(list == NULL) {
+ return;
+ }
+ if(list->data != NULL) {
+ free(list->data);
+ list->data = NULL;
+ }
+ if(list->next != NULL) {
+ pm_list_free(list->next);
+ }
+ free(list);
+ return;
+}
+
+PMList* pm_list_add(PMList *list, void *data)
+{
+ PMList *ptr, *lp;
+
+ ptr = list;
+ if(ptr == NULL) {
+ ptr = pm_list_new();
+ }
+
+ lp = pm_list_last(ptr);
+ if(lp == ptr && lp->data == NULL) {
+ /* nada */
+ } else {
+ lp->next = pm_list_new();
+ if(lp->next == NULL) {
+ return(NULL);
+ }
+ lp->next->prev = lp;
+ lp = lp->next;
+ }
+ lp->data = data;
+ return(ptr);
+}
+
+/* Add items to a list in sorted order. Use the given comparision func to
+ * determine order.
+ */
+PMList* pm_list_add_sorted(PMList *list, void *data, pm_fn_cmp fn)
+{
+ PMList *add;
+ PMList *prev = NULL;
+ PMList *iter = list;
+
+ add = pm_list_new();
+ add->data = data;
+
+ /* Find insertion point. */
+ while(iter) {
+ if(fn(add->data, iter->data) <= 0) break;
+ prev = iter;
+ iter = iter->next;
+ }
+
+ /* Insert node before insertion point. */
+ add->prev = prev;
+ add->next = iter;
+ if(iter != NULL) {
+ /* Not at end. */
+ iter->prev = add;
+ }
+ if(prev != NULL) {
+ /* In middle. */
+ prev->next = add;
+ } else {
+ /* Start or empty, new list head. */
+ list = add;
+ }
+
+ return(list);
+}
+
+/* Remove an item in a list. Use the given comparaison function to find the
+ * item.
+ * If found, 'ptr' is set to point to the removed element, so that the caller
+ * can free it. Otherwise, ptr is NULL.
+ * Return the new list (without the removed element).
+ */
+PMList *_alpm_list_remove(PMList *list, void *data, pm_fn_cmp fn, void **ptr)
+{
+ PMList *i = list;
+
+ while(i) {
+ if(fn(data, i->data) == 0) {
+ break;
+ }
+ i = i->next;
+ }
+
+ if(ptr) {
+ *ptr = NULL;
+ }
+
+ if(i) {
+ /* we found a matching item */
+ if(i->next) {
+ i->next->prev = i->prev;
+ }
+ if(i->prev) {
+ i->prev->next = i->next;
+ }
+ if(i == list) {
+ /* The item found is the first in the chain,
+ * so we move the header to the next element.
+ */
+ list = list->next;
+ }
+
+ if(ptr) {
+ *ptr = i->data;
+ }
+
+ free(i);
+ }
+
+ return(list);
+}
+
+int pm_list_count(PMList *list)
+{
+ int i;
+ PMList *lp;
+
+ for(lp = list, i = 0; lp; lp = lp->next, i++);
+
+ return(i);
+}
+
+int pm_list_is_ptrin(PMList *haystack, void *needle)
+{
+ PMList *lp;
+
+ for(lp = haystack; lp; lp = lp->next) {
+ if(lp->data == needle) {
+ return(1);
+ }
+ }
+ return(0);
+}
+
+/* Test for existence of a string in a PMList
+ */
+PMList *pm_list_is_strin(char *needle, PMList *haystack)
+{
+ PMList *lp;
+
+ for(lp = haystack; lp; lp = lp->next) {
+ if(lp->data && !strcmp(lp->data, needle)) {
+ return(lp);
+ }
+ }
+ return(NULL);
+}
+
+PMList* pm_list_last(PMList *list)
+{
+ PMList *ptr;
+
+ for(ptr = list; ptr && ptr->next; ptr = ptr->next);
+ return(ptr);
+}
+
+/* vim: set ts=2 sw=2 noet: */