lib/mbssep.c

   1 /* Tokenizing 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 char *
  32 mbssep (char **stringp, const char *delim)
  33 {
  34   if (MB_CUR_MAX > 1)
  35     {
  36       char *start = *stringp;
  37
  38       if (start == NULL)
  39         return NULL;
  40
  41       /* No need to optimize the cases of 0 or 1 delimiters specially,
  42          since mbspbrk already optimizes them.  */
  43
  44       char *ptr = mbspbrk (start, delim);
  45
  46       if (ptr == NULL)
  47         *stringp = NULL;
  48       else
  49         {
  50 #if GNULIB_MCEL_PREFER
  51           *stringp = ptr + mcel_scanz (ptr).len;
  52 #else
  53           mbuif_state_t state;
  54           mbuif_init (state);
  55           if (!mbuif_avail (state, ptr))
  56             abort ();
  57           mbchar_t cur = mbuif_next (state, ptr);
  58           *stringp = ptr + mb_len (cur);
  59 #endif
  60           *ptr = '\0';
  61         }
  62       return start;
  63     }
  64   else
  65     return strsep (stringp, delim);
  66 }