lib/mbsnlen.c

   1 /* Counting the multibyte characters in a string.
   2    Copyright (C) 2007-2018 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2007.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include <string.h>
  22
  23 #include <stdlib.h>
  24
  25 #include "mbiter.h"
  26
  27 /* Return the number of multibyte characters in the character string starting
  28    at STRING and ending at STRING + LEN.  */
  29 size_t
  30 mbsnlen (const char *string, size_t len)
  31 {
  32   if (MB_CUR_MAX > 1)
  33     {
  34       size_t count;
  35       mbi_iterator_t iter;
  36
  37       count = 0;
  38       for (mbi_init (iter, string, len); mbi_avail (iter); mbi_advance (iter))
  39         count++;
  40
  41       return count;
  42     }
  43   else
  44     return len;
  45 }