1/* Count characters in UTF-8 string. 2 Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2007. 4 5 This program is free software: you can redistribute it and/or modify it 6 under the terms of the GNU Lesser General Public License as published 7 by the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program 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 GNU 13 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 <http://www.gnu.org/licenses/>. */ 17 18#include <config.h> 19 20/* Specification. */ 21#include "unistr.h" 22 23size_t 24u8_mbsnlen (const uint8_t *s, size_t n) 25{ 26 size_t characters; 27 28 characters = 0; 29 while (n > 0) 30 { 31 ucs4_t uc; 32 int count = u8_mbtoucr (&uc, s, n); 33 characters++; 34 if (count == -2) 35 break; 36 if (count <= 0) 37 count = 1; 38 s += count; 39 n -= count; 40 } 41 return characters; 42} 43