1/* Search character in UTF-8 string. 2 Copyright (C) 1999, 2002, 2006-2007, 2009-2010 Free Software Foundation, 3 Inc. 4 Written by Bruno Haible <bruno@clisp.org>, 2002. 5 6 This program is free software: you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published 8 by the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19#include <config.h> 20 21/* Specification. */ 22#include "unistr.h" 23 24uint8_t * 25u8_strchr (const uint8_t *s, ucs4_t uc) 26{ 27 uint8_t c[6]; 28 29 if (uc < 0x80) 30 { 31 uint8_t c0 = uc; 32 33 for (;; s++) 34 { 35 if (*s == c0) 36 break; 37 if (*s == 0) 38 goto notfound; 39 } 40 return (uint8_t *) s; 41 } 42 else 43 switch (u8_uctomb_aux (c, uc, 6)) 44 { 45 case 2: 46 if (*s == 0) 47 goto notfound; 48 { 49 uint8_t c0 = c[0]; 50 uint8_t c1 = c[1]; 51 52 for (;; s++) 53 { 54 if (s[1] == 0) 55 goto notfound; 56 if (*s == c0 && s[1] == c1) 57 break; 58 } 59 return (uint8_t *) s; 60 } 61 62 case 3: 63 if (*s == 0 || s[1] == 0) 64 goto notfound; 65 { 66 uint8_t c0 = c[0]; 67 uint8_t c1 = c[1]; 68 uint8_t c2 = c[2]; 69 70 for (;; s++) 71 { 72 if (s[2] == 0) 73 goto notfound; 74 if (*s == c0 && s[1] == c1 && s[2] == c2) 75 break; 76 } 77 return (uint8_t *) s; 78 } 79 80 case 4: 81 if (*s == 0 || s[1] == 0 || s[2] == 0) 82 goto notfound; 83 { 84 uint8_t c0 = c[0]; 85 uint8_t c1 = c[1]; 86 uint8_t c2 = c[2]; 87 uint8_t c3 = c[3]; 88 89 for (;; s++) 90 { 91 if (s[3] == 0) 92 goto notfound; 93 if (*s == c0 && s[1] == c1 && s[2] == c2 && s[3] == c3) 94 break; 95 } 96 return (uint8_t *) s; 97 } 98 } 99notfound: 100 return NULL; 101} 102