text: /* Look at first character in UTF-32 string.
     Copyright (C) 2002, 2006-2007, 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 Lesser 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
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser 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 u32_mbtouc as 'extern', not 'static inline'.  */
  # include "unistring-notinline.h"
  #endif
  
  /* Specification.  */
  #include "unistr.h"
  
  #if !HAVE_INLINE
  
  int
  u32_mbtouc (ucs4_t *puc, const uint32_t *s, size_t n)
  {
    uint32_t c = *s;
  
    if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
      *puc = c;
    else
      /* invalid multibyte character */
      *puc = 0xfffd;
    return 1;
  }
  
  #endif
  