| /* Count characters in UTF-8 string. |
| Copyright (C) 2007, 2009-2020 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 <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "unistr.h" |
| |
| size_t |
| u8_mbsnlen (const uint8_t *s, size_t n) |
| { |
| size_t characters; |
| |
| characters = 0; |
| while (n > 0) |
| { |
| ucs4_t uc; |
| int count = u8_mbtoucr (&uc, s, n); |
| characters++; |
| if (count == -2) |
| break; |
| if (count < 0) |
| count = u8_mbtouc (&uc, s, n); |
| else if (count == 0) |
| count = 1; |
| s += count; |
| n -= count; |
| } |
| return characters; |
| } |