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/* 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 "arch.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, FlagNoPointers, 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;

}