1 /* Previous grapheme cluster function.
2 Copyright (C) 2010-2012 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@cs.stanford.edu>, 2010.
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.
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.
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/>. */
26 u16_grapheme_prev (const uint16_t *s, const uint16_t *start)
33 s = u16_prev (&next, s, start);
36 const uint16_t *prev_s;
39 prev_s = u16_prev (&prev, s, start);
42 /* Ill-formed UTF-16 encoding. */
46 if (uc_is_grapheme_break (prev, next))