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/* go-int-to-string.c -- convert an integer to a string in Go.

   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_int_to_string (int v)

{

  char buf[4];

  int len;

  unsigned char *retdata;

  struct __go_string ret;

  if (v <= 0x7f)

    {

      buf[0] = v;

      len = 1;

    }

  else if (v <= 0x7ff)

    {

      buf[0] = 0xc0 + (v >> 6);

      buf[1] = 0x80 + (v & 0x3f);

      len = 2;

    }

  else

    {

      /* If the value is out of range for UTF-8, turn it into the

         "replacement character".  */

      if (v > 0x10ffff)

        v = 0xfffd;

      if (v <= 0xffff)

        {

          buf[0] = 0xe0 + (v >> 12);

          buf[1] = 0x80 + ((v >> 6) & 0x3f);

          buf[2] = 0x80 + (v & 0x3f);

          len = 3;

        }

      else

        {

          buf[0] = 0xf0 + (v >> 18);

          buf[1] = 0x80 + ((v >> 12) & 0x3f);

          buf[2] = 0x80 + ((v >> 6) & 0x3f);

          buf[3] = 0x80 + (v & 0x3f);

          len = 4;

        }

    }

  retdata = runtime_mallocgc (len, FlagNoPointers, 1, 0);

  __builtin_memcpy (retdata, buf, len);

  ret.__data = retdata;

  ret.__length = len;

  return ret;

}