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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;
}