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/* go-int-array-to-string.c -- convert an array of ints 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-assert.h"

#include "go-string.h"

#include "runtime.h"

#include "arch.h"

#include "malloc.h"

struct __go_string

__go_int_array_to_string (const void* p, int len)

{

  const int *ints;

  int slen;

  int i;

  unsigned char *retdata;

  struct __go_string ret;

  unsigned char *s;

  ints = (const int *) p;

  slen = 0;

  for (i = 0; i < len; ++i)

    {

      int v;

      v = ints[i];

      if (v > 0x10ffff)

        v = 0xfffd;

      if (v <= 0x7f)

        slen += 1;

      else if (v <= 0x7ff)

        slen += 2;

      else if (v <= 0xffff)

        slen += 3;

      else

        slen += 4;

    }

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

  ret.__data = retdata;

  ret.__length = slen;

  s = retdata;

  for (i = 0; i < len; ++i)

    {

      int v;

      v = ints[i];

      /* If V is out of range for UTF-8, substitute the replacement

         character.  */

      if (v > 0x10ffff)

        v = 0xfffd;

      if (v <= 0x7f)

        *s++ = v;

      else if (v <= 0x7ff)

        {

          *s++ = 0xc0 | ((v >> 6) & 0x1f);

          *s++ = 0x80 | (v & 0x3f);

        }

      else if (v <= 0xffff)

        {

          *s++ = 0xe0 | ((v >> 12) & 0xf);

          *s++ = 0x80 | ((v >> 6) & 0x3f);

          *s++ = 0x80 | (v & 0x3f);

        }

      else

        {

          *s++ = 0xf0 | ((v >> 18) & 0x7);

          *s++ = 0x80 | ((v >> 12) & 0x3f);

          *s++ = 0x80 | ((v >> 6) & 0x3f);

          *s++ = 0x80 | (v & 0x3f);

        }

    }

  __go_assert (s - retdata == slen);

  return ret;

}