1 /* Search for some characters in UTF-8/UTF-16/UTF-32 string. 2 Copyright (C) 1999, 2002, 2006, 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 UNIT * 27 FUNC (const UNIT *str, const UNIT *accept) /* */ 28 { 29 /* Optimize two cases. */ 30 if (accept[0] == 0) 31 return NULL; 32 { 33 ucs4_t uc; 34 int count = U_STRMBTOUC (&uc, accept); 35 if (count >= 0 && accept[count] == 0) 36 return U_STRCHR (str, uc); 37 } 38 /* General case. */ 39 { 40 const UNIT *ptr = str; 41 42 for (;;) 43 { 44 ucs4_t uc; 45 int count = U_STRMBTOUC (&uc, ptr); 46 if (count <= 0) 47 break; 48 if (U_STRCHR (accept, uc)) 49 return (UNIT *) ptr; 50 ptr += count; 51 } 52 return NULL; 53 } 54 }