| /* Check UTF-16 string. |
| Copyright (C) 2002, 2006-2007, 2009-2020 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 2002. |
| |
| 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" |
| |
| const uint16_t * |
| u16_check (const uint16_t *s, size_t n) |
| { |
| const uint16_t *s_end = s + n; |
| |
| while (s < s_end) |
| { |
| /* Keep in sync with unistr.h and u16-mbtouc-aux.c. */ |
| uint16_t c = *s; |
| |
| if (c < 0xd800 || c >= 0xe000) |
| { |
| s++; |
| continue; |
| } |
| if (c < 0xdc00) |
| { |
| if (s + 2 <= s_end |
| && s[1] >= 0xdc00 && s[1] < 0xe000) |
| { |
| s += 2; |
| continue; |
| } |
| } |
| /* invalid or incomplete multibyte character */ |
| return s; |
| } |
| return NULL; |
| } |