1 /* Search character in piece of UTF-16 string. 2 Copyright (C) 1999, 2002, 2006-2007, 2009-2021 Free Software Foundation, 3 Inc. 4 Written by Bruno Haible <bruno@clisp.org>, 2002. 5 6 This file is free software. 7 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". 8 You can redistribute it and/or modify it under either 9 - the terms of the GNU Lesser General Public License as published 10 by the Free Software Foundation; either version 3, or (at your 11 option) any later version, or 12 - the terms of the GNU General Public License as published by the 13 Free Software Foundation; either version 2, or (at your option) 14 any later version, or 15 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". 16 17 This file is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 Lesser General Public License and the GNU General Public License 21 for more details. 22 23 You should have received a copy of the GNU Lesser General Public 24 License and of the GNU General Public License along with this 25 program. If not, see <https://www.gnu.org/licenses/>. */ 26 27 #include <config.h> 28 29 /* Specification. */ 30 #include "unistr.h" 31 32 uint16_t * 33 u16_chr (const uint16_t *s, size_t n, ucs4_t uc) /* */ 34 { 35 uint16_t c[2]; 36 37 if (uc < 0x10000) 38 { 39 uint16_t c0 = uc; 40 41 for (; n > 0; s++, n--) 42 { 43 if (*s == c0) 44 return (uint16_t *) s; 45 } 46 } 47 else 48 switch (u16_uctomb_aux (c, uc, 2)) 49 { 50 case 2: 51 if (n > 1) 52 { 53 uint16_t c0 = c[0]; 54 uint16_t c1 = c[1]; 55 56 for (n--; n > 0; s++, n--) 57 { 58 if (*s == c0 && s[1] == c1) 59 return (uint16_t *) s; 60 } 61 } 62 break; 63 } 64 return NULL; 65 }