1 files changed, 52 insertions, 0 deletions
diff --git a/libgo/runtime/go-map-delete.c b/libgo/runtime/go-map-delete.c
new file mode 100644
index 00000000000..ec851e531d2
--- /dev/null
+++ b/libgo/runtime/go-map-delete.c
@@ -0,0 +1,52 @@
+/* go-map-delete.c -- delete an entry from a map.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#include "go-alloc.h"
+#include "go-assert.h"
+#include "map.h"
+
+/* Delete the entry matching KEY from MAP.  */
+
+void
+__go_map_delete (struct __go_map *map, const void *key)
+{
+  const struct __go_map_descriptor *descriptor;
+  const struct __go_type_descriptor *key_descriptor;
+  size_t key_offset;
+  _Bool (*equalfn) (const void*, const void*, size_t);
+  size_t key_hash;
+  size_t key_size;
+  size_t bucket_index;
+  void **pentry;
+
+  descriptor = map->__descriptor;
+
+  key_descriptor = descriptor->__map_descriptor->__key_type;
+  key_offset = descriptor->__key_offset;
+  key_size = key_descriptor->__size;
+  __go_assert (key_size != 0 && key_size != -1UL);
+  equalfn = key_descriptor->__equalfn;
+
+  key_hash = key_descriptor->__hashfn (key, key_size);
+  bucket_index = key_hash % map->__bucket_count;
+
+  pentry = map->__buckets + bucket_index;
+  while (*pentry != NULL)
+    {
+      char *entry = (char *) *pentry;
+      if (equalfn (key, entry + key_offset, key_size))
+	{
+	  *pentry = *(void **) entry;
+	  __go_free (entry);
+	  map->__element_count -= 1;
+	  break;
+	}
+      pentry = (void **) entry;
+    }
+}