lib/mbslen.c

   1 /* Counting the multibyte characters in a string.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2007.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation, either version 3 of the
   8    License, or (at your option) any later version.
   9
  10    This file 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 Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser 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 #if GNULIB_MCEL_PREFER
  26 # include "mcel.h"
  27 #else
  28 # include "mbuiterf.h"
  29 #endif
  30
  31 /* Return the number of multibyte characters in the character string STRING.  */
  32 size_t
  33 mbslen (const char *string)
  34 {
  35   if (MB_CUR_MAX > 1)
  36     {
  37       size_t count = 0;
  38
  39 #if GNULIB_MCEL_PREFER
  40       for (; *string; string += mcel_scanz (string).len)
  41         count++;
  42 #else
  43       mbuif_state_t state;
  44       const char *iter;
  45       for (mbuif_init (state), iter = string; mbuif_avail (state, iter); )
  46         {
  47           mbchar_t cur = mbuif_next (state, iter);
  48           count++;
  49           iter += mb_len (cur);
  50         }
  51 #endif
  52
  53       return count;
  54     }
  55   else
  56     return strlen (string);
  57 }