map: implement map_prefix_delete

2 files changed, 15 insertions, 0 deletions

diff --git a/map.c b/map.c
index f6e5c64..7994f34 100644
--- a/map.c
+++ b/map.c
@@ -288,6 +288,19 @@ const Map *map_prefix(const Map *map, const char *prefix)
 	return top;
 }
 
+bool map_prefix_delete(Map *map, const char *prefix)
+{
+	bool ret = false;
+	do {
+		const char *conflict = NULL;
+		const Map *conflicts = map_prefix(map, prefix);
+		if (!map_first(conflicts, &conflict))
+			break;
+		ret = map_delete(map, conflict);
+	} while (ret);
+	return ret;
+}
+
 static void clear(Map n)
 {
 	if (!n.v) {
diff --git a/map.h b/map.h
index ca7bd44..3035ff4 100644
--- a/map.h
+++ b/map.h
@@ -31,6 +31,8 @@ void map_iterate(const Map*, bool (*handle)(const char *key, void *value, void *
 /* Return a submap matching a prefix. This returns a pointer into the
  * original map, so don't alter the map while using the return value. */
 const Map *map_prefix(const Map*, const char *prefix);
+/* Delete all entries of the prefix map */
+bool map_prefix_delete(Map*, const char *prefix);
 /* Test whether the map is empty i.e. contains no elements */
 bool map_empty(const Map*);
 /* Remove every member from the map. The map will be empty after this. */