1 files changed, 30 insertions, 0 deletions
diff --git a/libgo/runtime/go-strplus.c b/libgo/runtime/go-strplus.c
new file mode 100644
index 000000000..c0cd356ca
--- /dev/null
+++ b/libgo/runtime/go-strplus.c
@@ -0,0 +1,30 @@
+/* go-strplus.c -- the go string append function.
+
+   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 "go-string.h"
+#include "runtime.h"
+#include "malloc.h"
+
+struct __go_string
+__go_string_plus (struct __go_string s1, struct __go_string s2)
+{
+  int len;
+  unsigned char *retdata;
+  struct __go_string ret;
+
+  if (s1.__length == 0)
+    return s2;
+  else if (s2.__length == 0)
+    return s1;
+
+  len = s1.__length + s2.__length;
+  retdata = runtime_mallocgc (len, RefNoPointers, 1, 0);
+  __builtin_memcpy (retdata, s1.__data, s1.__length);
+  __builtin_memcpy (retdata + s1.__length, s2.__data, s2.__length);
+  ret.__data = retdata;
+  ret.__length = len;
+  return ret;
+}