root/maint/gnulib/lib/unistr/u32-prev.c

/* */

DEFINITIONS

1. u32_prev

   1 /* Iterate over previous character in UTF-32 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 uint32_t *
  32 u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start)
     /*  */
  33 {
  34   if (s != start)
  35     {
  36       uint32_t c_1 = s[-1];
  37 
  38       if (c_1 < 0xd800 || (c_1 >= 0xe000 && c_1 < 0x110000))
  39         {
  40           *puc = c_1;
  41           return s - 1;
  42         }
  43     }
  44   return NULL;
  45 }

/* */