/* Iterate over next character in UTF-8 string.

   Copyright (C) 2002, 2006, 2009-2025 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2002.

   This file is free software.

   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".

   You can redistribute it and/or modify it under either

     - the terms of the GNU Lesser General Public License as published

       by the Free Software Foundation, either version 3, or (at your

       option) any later version, or

     - the terms of the GNU General Public License as published by the

       Free Software Foundation; either version 2, or (at your option)

       any later version, or

     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".

   This file 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

   Lesser General Public License and the GNU General Public License

   for more details.

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

   License and of the GNU General Public License along with this

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

/* Don't use the const-improved function macros in this compilation unit.  */

#define _LIBUNISTRING_NO_CONST_GENERICS

#include <config.h>

/* Specification.  */

#include "unistr.h"

const uint8_t *

u8_next (ucs4_t *puc, const uint8_t *s)

{

  int count;

  count = u8_strmbtouc (puc, s);

  if (count > 0)

    return s + count;

  else

    {

      if (count < 0)

        *puc = 0xfffd;

      return NULL;

    }

}