X-Git-Url: http://pileus.org/git/?p=wmpus;a=blobdiff_plain;f=util.c;h=aeb766eaa01f32d65234e84261b97d63d503efe3;hp=a91d1bdc329d151ee9dad33ec7c1df34fd15c3ee;hb=43cb9b7de22dac5864d73321ec974bb937a217ff;hpb=354101b66a115a36599d856fc7f3b4b350c080e4

diff --git a/util.c b/util.c
index a91d1bd..aeb766e 100644
--- a/util.c
+++ b/util.c
@@ -1,9 +1,25 @@
+/*
+ * Copyright (c) 2011, Andy Spencer <andy753421@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
 
 #include "util.h"
 
+/* Doubly linked lists */
 list_t *list_insert(list_t *next, void *data)
 {
 	list_t *node = new0(list_t);
@@ -30,7 +46,7 @@ void list_insert_after(list_t *prev, void *data)
 list_t *list_append(list_t *head, void *data)
 {
 	list_t *last = head;
-	while (last->next)
+	while (last && last->next)
 		last = last->next;
 	list_t *node = new0(list_t);
 	node->data = data;
@@ -39,12 +55,14 @@ list_t *list_append(list_t *head, void *data)
 	return last ? head : node;
 }
 
-list_t *list_remove(list_t *head, list_t *node)
+list_t *list_remove(list_t *head, list_t *node, int freedata)
 {
 	list_t *next = node->next;
 	list_t *prev = node->prev;
 	if (next) next->prev = prev;
 	if (prev) prev->next = next;
+	if (freedata)
+		free(node->data);
 	free(node);
 	return head == node ? next : head;
 }
@@ -57,6 +75,21 @@ int list_length(list_t *node)
 	return len;
 }
 
+list_t *list_last(list_t *list)
+{
+	while (list && list->next)
+		list = list->next;
+	return list;
+}
+
+list_t *list_find(list_t *list, void *data)
+{
+	for (list_t *cur = list; cur; cur = cur->next)
+		if (cur->data == data)
+			return cur;
+	return NULL;
+}
+
 /* Misc */
 int error(char *fmt, ...)
 {