| /* Next grapheme cluster function. |
| Copyright (C) 2010-2020 Free Software Foundation, Inc. |
| Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. |
| |
| 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 "unigbrk.h" |
| |
| #include "unistr.h" |
| |
| const uint16_t * |
| u16_grapheme_next (const uint16_t *s, const uint16_t *end) |
| { |
| ucs4_t prev; |
| int mblen; |
| |
| if (s == end) |
| return NULL; |
| |
| for (s += u16_mbtouc (&prev, s, end - s); s != end; s += mblen) |
| { |
| ucs4_t next; |
| |
| mblen = u16_mbtouc (&next, s, end - s); |
| if (uc_is_grapheme_break (prev, next)) |
| break; |
| |
| prev = next; |
| } |
| |
| return s; |
| } |