1 /* Iterate over previous character in UTF-32 string. 2 Copyright (C) 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2002. 4 5 This file is free software. 6 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". 7 You can redistribute it and/or modify it under either 8 - the terms of the GNU Lesser General Public License as published 9 by the Free Software Foundation; either version 3, or (at your 10 option) any later version, or 11 - the terms of the GNU General Public License as published by the 12 Free Software Foundation; either version 2, or (at your option) 13 any later version, or 14 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". 15 16 This file is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 Lesser General Public License and the GNU General Public License 20 for more details. 21 22 You should have received a copy of the GNU Lesser General Public 23 License and of the GNU General Public License along with this 24 program. If not, see <https://www.gnu.org/licenses/>. */ 25 26 #include <config.h> 27 28 /* Specification. */ 29 #include "unistr.h" 30 31 const uint32_t * 32 u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start) /* */ 33 { 34 if (s != start) 35 { 36 uint32_t c_1 = s[-1]; 37 38 if (c_1 < 0xd800 || (c_1 >= 0xe000 && c_1 < 0x110000)) 39 { 40 *puc = c_1; 41 return s - 1; 42 } 43 } 44 return NULL; 45 }