X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=src%2Futils_llist.c;h=11f838d248f6ab799c53654569f683af07db6d2d;hb=dbf349ec8c0150a52a7bad5f8b9fc79a6201e2f6;hp=f7e03c239b9889d4f62ecb62ae34488c868de2eb;hpb=e01359a9c65e5f7f26a481443504c75afab520d2;p=collectd.git

diff --git a/src/utils_llist.c b/src/utils_llist.c
index f7e03c23..11f838d2 100644
--- a/src/utils_llist.c
+++ b/src/utils_llist.c
@@ -59,6 +59,9 @@ void llist_destroy (llist_t *l)
 	llentry_t *e_this;
 	llentry_t *e_next;
 
+	if (l == NULL)
+		return;
+
 	for (e_this = l->head; e_this != NULL; e_this = e_next)
 	{
 		e_next = e_this->next;
@@ -106,6 +109,10 @@ void llist_prepend (llist_t *l, llentry_t *e)
 {
 	e->next = l->head;
 	l->head = e;
+
+	if (l->tail == NULL)
+		l->tail = e;
+
 	++(l->size);
 }
 
@@ -113,6 +120,9 @@ void llist_remove (llist_t *l, llentry_t *e)
 {
 	llentry_t *prev;
 
+	if ((l == NULL) || (e == NULL))
+		return;
+
 	prev = l->head;
 	while ((prev != NULL) && (prev->next != e))
 		prev = prev->next;
@@ -132,23 +142,49 @@ int llist_size (llist_t *l)
 	return (l ? l->size : 0);
 }
 
+static int llist_strcmp (llentry_t *e, void *ud)
+{
+	if ((e == NULL) || (ud == NULL))
+		return (-1);
+	return (strcmp (e->key, (const char *)ud));
+}
+
 llentry_t *llist_search (llist_t *l, const char *key)
 {
+	return (llist_search_custom (l, llist_strcmp, (void *)key));
+}
+
+llentry_t *llist_search_custom (llist_t *l,
+		int (*compare) (llentry_t *, void *), void *user_data)
+{
 	llentry_t *e;
 
-	for (e = l->head; e != NULL; e = e->next)
-		if (strcmp (key, e->key) == 0)
+	if (l == NULL)
+		return (NULL);
+
+	e = l->head;
+	while (e != NULL) {
+		llentry_t *next = e->next;
+
+		if (compare (e, user_data) == 0)
 			break;
 
+		e = next;
+	}
+
 	return (e);
 }
 
 llentry_t *llist_head (llist_t *l)
 {
+	if (l == NULL)
+		return (NULL);
 	return (l->head);
 }
 
 llentry_t *llist_tail (llist_t *l)
 {
+	if (l == NULL)
+		return (NULL);
 	return (l->tail);
 }