/* Conversion UCS-4 to UTF-16.
   Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2002.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#include <config.h>

/* Specification.  */
#include "unistr.h"

#if HAVE_INLINE

int
u16_uctomb_aux (uint16_t *s, ucs4_t uc, int n)
{
  if (uc < 0xd800)
    {
      /* The case n >= 1 is already handled by the caller.  */
    }
  else if (uc < 0x10000)
    {
      if (uc >= 0xe000)
	{
	  if (n >= 1)
	    {
	      s[0] = uc;
	      return 1;
	    }
	}
      else
	return -1;
    }
  else
    {
      if (uc < 0x110000)
	{
	  if (n >= 2)
	    {
	      s[0] = 0xd800 + ((uc - 0x10000) >> 10);
	      s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
	      return 2;
	    }
	}
      else
	return -1;
    }
  return -2;
}

#endif