utils_llist: Added `llist_search_custom()'.

This function may be used for lookups using a custom compare function, i.e.
lookups that are not necessarily based on the name of the registered list
entry but some information specific to the used data-type.

diff --git a/src/utils_llist.c b/src/utils_llist.c
index bf5f7e4..6a0c6f0 100644 (file)
--- a/src/utils_llist.c
+++ b/src/utils_llist.c
@@ -139,17 +139,36 @@ 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;
 
        if (l == NULL)
                return (NULL);
 
-       for (e = l->head; e != NULL; e = e->next)
-               if (strcmp (key, e->key) == 0)
+       e = l->head;
+       while (e != NULL) {
+               llentry_t *next = e->next;
+
+               if (compare (e, user_data) == 0)
                        break;
 
+               e = next;
+       }
+
        return (e);
 }
 

diff --git a/src/utils_llist.h b/src/utils_llist.h
index c3753d8..19d8d94 100644 (file)
--- a/src/utils_llist.h
+++ b/src/utils_llist.h
@@ -54,6 +54,8 @@ void llist_remove (llist_t *l, llentry_t *e);
 int llist_size (llist_t *l);
 
 llentry_t *llist_search (llist_t *l, const char *key);
+llentry_t *llist_search_custom (llist_t *l,
+               int (*compare) (llentry_t *, void *), void *user_data);
 
 llentry_t *llist_head (llist_t *l);
 llentry_t *llist_tail (llist_t *l);