root/maint/gnulib/lib/unistr/u8-mbsnlen.c

/* */

DEFINITIONS

1. u8_mbsnlen

   1 /* Count characters in UTF-8 string.
   2    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2007.
   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 size_t
  32 u8_mbsnlen (const uint8_t *s, size_t n)
     /*  */
  33 {
  34   size_t characters;
  35 
  36   characters = 0;
  37   while (n > 0)
  38     {
  39       ucs4_t uc;
  40       int count = u8_mbtoucr (&uc, s, n);
  41       characters++;
  42       if (count == -2)
  43         break;
  44       if (count < 0)
  45         count = u8_mbtouc (&uc, s, n);
  46       else if (count == 0)
  47         count = 1;
  48       s += count;
  49       n -= count;
  50     }
  51   return characters;
  52 }

/* */