1  /* Counting the multibyte characters in a string.
       2     Copyright (C) 2007-2023 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  }