work on DELETE VARS

[pspp] / src / data / case-map.c

diff --git a/src/data/case-map.c b/src/data/case-map.c
index 87174f1fb3a4e37eb90064b5ab3f78f81aa9d894..5d2a347472df7e185461dbe372f77aefb63682f2 100644 (file)
--- a/src/data/case-map.c
+++ b/src/data/case-map.c
@@ -72,6 +72,22 @@ insert_mapping (struct case_map *map, size_t from, size_t to)
   map->map[to] = from;
 }
 
+/* Returns a copy of OLD, if OLD is nonnull, and otherwise returns NULL.  */
+struct case_map *
+case_map_clone (const struct case_map *old)
+{
+  if (!old)
+    return NULL;
+
+  size_t n_values = caseproto_get_n_widths (old->proto);
+  struct case_map *new = xmalloc (sizeof *new);
+  *new = (struct case_map) {
+    .proto = caseproto_ref (old->proto),
+    .map = xmemdup (old->proto, n_values * sizeof *new->map),
+  };
+  return new;
+}
+
 /* Destroys case map MAP. */
 void
 case_map_destroy (struct case_map *map)