Add a third default.

[oweals/gnunet.git] / src / util / container_slist.c

diff --git a/src/util/container_slist.c b/src/util/container_slist.c
index 7b85dc87760780239eeab9720e1e030f64cc97fb..10af916c38d4921ed9c70e82ee928ef3c43f12fc 100644 (file)
--- a/src/util/container_slist.c
+++ b/src/util/container_slist.c
@@ -4,7 +4,7 @@
 
      GNUnet 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, or (at your
+     by the Free Software Foundation; either version 3, or (at your
      option) any later version.
 
      GNUnet is distributed in the hope that it will be useful, but
@@ -250,10 +250,11 @@ GNUNET_CONTAINER_slist_clear (struct GNUNET_CONTAINER_SList *l)
 
 /**
  * Check if a list contains a certain element
- *
  * @param l list
  * @param buf payload buffer to find
  * @param len length of the payload (number of bytes in buf)
+ *
+ * @return GNUNET_YES if found, GNUNET_NO otherwise
  */
 int
 GNUNET_CONTAINER_slist_contains (const struct GNUNET_CONTAINER_SList *l,
@@ -267,6 +268,32 @@ GNUNET_CONTAINER_slist_contains (const struct GNUNET_CONTAINER_SList *l,
   return GNUNET_NO;
 }
 
+typedef int (*Comparator)(const void *,  size_t, const void *,  size_t);
+
+/**
+ * Check if a list contains a certain element
+ *
+ * @param l list
+ * @param buf payload buffer to find
+ * @param len length of the payload (number of bytes in buf)
+ * @param compare comparison function, should return 0 if compared elements match
+ *
+ * @return NULL if the 'buf' could not be found, pointer to the
+ *         list element, if found
+ */
+void *
+GNUNET_CONTAINER_slist_contains2 (const struct GNUNET_CONTAINER_SList *l,
+                                  const void *buf, size_t len,
+                                  Comparator compare)
+{
+  struct GNUNET_CONTAINER_SList_Elem *e;
+
+  for (e = l->head; e != NULL; e = e->next)
+    if ((e->len == len) && (*compare)(buf, len, e->elem, e->len) == 0)
+      return e->elem;
+  return NULL;
+}
+
 
 /**
  * Count the elements of a list