kc3-lang/gnulib/lib/unistr/u16-mbtoucr.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/unistr/u16-mbtoucr.c

• /* Look at first character in UTF-16 string, returning an error code.
     Copyright (C) 1999-2002, 2006-2007, 2009-2023 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2001.
  
     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/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistr.h"
  
  int
  u16_mbtoucr (ucs4_t *puc, const uint16_t *s, size_t n)
  {
    uint16_t c = *s;
  
    if (c < 0xd800 || c >= 0xe000)
      {
        *puc = c;
        return 1;
      }
    if (c < 0xdc00)
      {
        if (n >= 2)
          {
            if (s[1] >= 0xdc00 && s[1] < 0xe000)
              {
                *puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00);
                return 2;
              }
            /* invalid multibyte character */
          }
        else
          {
            /* incomplete multibyte character */
            *puc = 0xfffd;
            return -2;
          }
      }
    /* invalid multibyte character */
    *puc = 0xfffd;
    return -1;
  }
  

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