maint/gnulib/lib/unistr/u16-check.c

/* */
This source file includes following definitions.
u16_check
   1 /* Check UTF-16 string.
   2    Copyright (C) 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4 
   5    This file is free software.
   6    It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   7    You can redistribute it and/or modify it under either
   8      - the terms of the GNU Lesser General Public License as published
   9        by the Free Software Foundation; either version 3, or (at your
  10        option) any later version, or
  11      - the terms of the GNU General Public License as published by the
  12        Free Software Foundation; either version 2, or (at your option)
  13        any later version, or
  14      - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
  15 
  16    This file is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License and the GNU General Public License
  20    for more details.
  21 
  22    You should have received a copy of the GNU Lesser General Public
  23    License and of the GNU General Public License along with this
  24    program.  If not, see <https://www.gnu.org/licenses/>.  */
  25 
  26 #include <config.h>
  27 
  28 /* Specification.  */
  29 #include "unistr.h"
  30 
  31 const uint16_t *
  32 u16_check (const uint16_t *s, size_t n)
     /*  */
  33 {
  34   const uint16_t *s_end = s + n;
  35 
  36   while (s < s_end)
  37     {
  38       /* Keep in sync with unistr.h and u16-mbtouc-aux.c.  */
  39       uint16_t c = *s;
  40 
  41       if (c < 0xd800 || c >= 0xe000)
  42         {
  43           s++;
  44           continue;
  45         }
  46       if (c < 0xdc00)
  47         {
  48           if (s + 2 <= s_end
  49               && s[1] >= 0xdc00 && s[1] < 0xe000)
  50             {
  51               s += 2;
  52               continue;
  53             }
  54         }
  55       /* invalid or incomplete multibyte character */
  56       return s;
  57     }
  58   return NULL;
  59 }
/* */
root/maint/gnulib/lib/unistr/u16-check.c

DEFINITIONS
