1 /* Iterate over previous character in UTF-16 string.
2 Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU Library General Public License as published
7 by the Free Software Foundation; either version 2, or (at your option)
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
26 u16_prev (ucs4_t *puc, const uint16_t *s, const uint16_t *start)
28 /* Keep in sync with utf16-ucs4.h and utf16-ucs4.c. */
33 if (c_1 < 0xd800 || c_1 >= 0xe000)
38 #if CONFIG_UNICODE_SAFETY
45 #if CONFIG_UNICODE_SAFETY
46 if (c_2 >= 0xd800 && c_2 < 0xdc00)
49 *puc = 0x10000 + ((c_2 - 0xd800) << 10) + (c_1 - 0xdc00);