locate: added locate_item_list_casefold()

Merged casefolding code from two locations into this one library
function.

src/dbUtils.c

@@ -84,14 +84,10 @@ searchForSongsIn(struct client *client, const char *name,
 		 const struct locate_item_list *criteria)
 {
 	int ret;
-	struct locate_item_list *new_list;
+	struct locate_item_list *new_list
+		= locate_item_list_casefold(criteria);
 	struct search_data data;
 
-	new_list = locate_item_list_new(criteria->length);
-	for (unsigned i = 0; i < criteria->length; i++)
-		new_list->items[i].needle =
-			g_utf8_casefold(criteria->items[i].needle, -1);
-
 	data.client = client;
 	data.criteria = new_list;
 

src/locate.c

@@ -117,6 +117,18 @@ locate_item_list_parse(char *argv[], int argc)
 	return list;
 }
 
+struct locate_item_list *
+locate_item_list_casefold(const struct locate_item_list *list)
+{
+	struct locate_item_list *new_list = locate_item_list_new(list->length);
+
+	for (unsigned i = 0; i < list->length; i++)
+		new_list->items[i].needle =
+			g_utf8_casefold(list->items[i].needle, -1);
+
+	return new_list;
+}
+
 void
 locate_item_free(struct locate_item *item)
 {

src/locate.h

@@ -63,6 +63,13 @@ locate_item_list_new(unsigned length);
 struct locate_item_list *
 locate_item_list_parse(char *argv[], int argc);
 
+/**
+ * Duplicate the struct locate_item_list object and convert all
+ * needles with g_utf8_casefold().
+ */
+struct locate_item_list *
+locate_item_list_casefold(const struct locate_item_list *list);
+
 void
 locate_item_list_free(struct locate_item_list *list);
 

src/queue_print.c

@@ -85,11 +85,7 @@ queue_search(struct client *client, const struct queue *queue,
 {
 	unsigned i;
 	struct locate_item_list *new_list =
-		locate_item_list_new(criteria->length);
-
-	for (i = 0; i < criteria->length; i++)
-		new_list->items[i].needle =
-			g_utf8_casefold(criteria->items[i].needle, -1);
+		locate_item_list_casefold(criteria);
 
 	for (i = 0; i < queue_length(queue); i++) {
 		const struct song *song = queue_get(queue, i);