util/set: add a clone function

v2: Add unit test. (Eric Anholt)

Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/util/set.c b/src/util/set.c
index 2c9b09319ff..b2aa5ba13d5 100644
--- a/src/util/set.c
+++ b/src/util/set.c
@@ -34,6 +34,7 @@
 
 #include <stdlib.h>
 #include <assert.h>
+#include <string.h>
 
 #include "macros.h"
 #include "ralloc.h"
@@ -132,6 +133,28 @@ _mesa_set_create(void *mem_ctx,
    return ht;
 }
 
+struct set *
+_mesa_set_clone(struct set *set, void *dst_mem_ctx)
+{
+   struct set *clone;
+
+   clone = ralloc(dst_mem_ctx, struct set);
+   if (clone == NULL)
+      return NULL;
+
+   memcpy(clone, set, sizeof(struct set));
+
+   clone->table = ralloc_array(clone, struct set_entry, clone->size);
+   if (clone->table == NULL) {
+      ralloc_free(clone);
+      return NULL;
+   }
+
+   memcpy(clone->table, set->table, clone->size * sizeof(struct set_entry));
+
+   return clone;
+}
+
 /**
  * Frees the given set.
  *