/* Store a character in UTF-8 string.

   Copyright (C) 2002, 2005-2006, 2009-2018 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 General Public License as published

   by the Free Software Foundation; either version 3 of the License, 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

   General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#if defined IN_LIBUNISTRING

/* Tell unistr.h to declare u8_uctomb as 'extern', not 'static inline'.  */

# include "unistring-notinline.h"

#endif

/* Specification.  */

#include "unistr.h"

#if !HAVE_INLINE

int

u8_uctomb (uint8_t *s, ucs4_t uc, int n)

{

  if (uc < 0x80)

    {

      if (n > 0)

        {

          s[0] = uc;

          return 1;

        }

      /* else return -2, below.  */

    }

  else

    {

      int count;

      if (uc < 0x800)

        count = 2;

      else if (uc < 0x10000)

        {

          if (uc < 0xd800 || uc >= 0xe000)

            count = 3;

          else

            return -1;

        }

      else if (uc < 0x110000)

        count = 4;

      else

        return -1;

      if (n >= count)

        {

          switch (count) /* note: code falls through cases! */

            {

            case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;

            case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;

            case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;

          /*case 1:*/ s[0] = uc;

            }

          return count;

        }

    }

  return -2;

}

#endif