summaryrefslogtreecommitdiff
path: root/lib/unistr/u16-mbsnlen.c
blob: 881958e1727571c25e4e5d3a5a1dc20629709ce2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
/* Count characters in UTF-16 string.
   Copyright (C) 2007 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2007.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include "unistr.h"

size_t
u16_mbsnlen (const uint16_t *s, size_t n)
{
  size_t characters;

  characters = 0;
  while (n > 0)
    {
      int count = u16_mblen (s, n);
      if (count <= 0)
	count = 1;
      s += count;
      n -= count;
      characters++;
    }
  return characters;
}