root/maint/gnulib/lib/unigbrk/u16-grapheme-next.c

/* */

DEFINITIONS

1. u16_grapheme_next

   1 /* Next grapheme cluster function.
   2    Copyright (C) 2010-2021 Free Software Foundation, Inc.
   3    Written by Ben Pfaff <blp@cs.stanford.edu>, 2010.
   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 "unigbrk.h"
  30 
  31 #include "unistr.h"
  32 
  33 const uint16_t *
  34 u16_grapheme_next (const uint16_t *s, const uint16_t *end)
     /*  */
  35 {
  36   ucs4_t prev;
  37   int mblen;
  38 
  39   if (s == end)
  40     return NULL;
  41 
  42   for (s += u16_mbtouc (&prev, s, end - s); s != end; s += mblen)
  43     {
  44       ucs4_t next;
  45 
  46       mblen = u16_mbtouc (&next, s, end - s);
  47       if (uc_is_grapheme_break (prev, next))
  48         break;
  49 
  50       prev = next;
  51     }
  52 
  53   return s;
  54 }

/* */