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

• /* Check UTF-16 string.
     Copyright (C) 2002, 2006-2007, 2009-2023 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/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistr.h"
  
  const uint16_t *
  u16_check (const uint16_t *s, size_t n)
  {
    const uint16_t *s_end = s + n;
  
    while (s < s_end)
      {
        /* Keep in sync with unistr.h and u16-mbtouc-aux.c.  */
        uint16_t c = *s;
  
        if (c < 0xd800 || c >= 0xe000)
          {
            s++;
            continue;
          }
        if (c < 0xdc00)
          {
            if (s + 2 <= s_end
                && s[1] >= 0xdc00 && s[1] < 0xe000)
              {
                s += 2;
                continue;
              }
          }
        /* invalid or incomplete multibyte character */
        return s;
      }
    return NULL;
  }
  

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