1/* Iterate over previous character in UTF-32 string. 2 Copyright (C) 2002, 2006-2007, 2009-2010 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2002. 4 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. 9 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. 14 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/>. */ 17 18#include <config.h> 19 20/* Specification. */ 21#include "unistr.h" 22 23const uint32_t * 24u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start) 25{ 26 if (s != start) 27 { 28 uint32_t c_1 = s[-1]; 29 30#if CONFIG_UNICODE_SAFETY 31 if (c_1 < 0xd800 || (c_1 >= 0xe000 && c_1 < 0x110000)) 32#endif 33 { 34 *puc = c_1; 35 return s - 1; 36 } 37 } 38 return NULL; 39} 40