1 /*- 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright (c) 2005-2014 Rich Felker, et al. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining 7 * a copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sublicense, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be 15 * included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 20 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 21 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 #include <sys/cdefs.h> 26 __FBSDID("$FreeBSD$"); 27 28 #include <limits.h> 29 #include <stdint.h> 30 #include <string.h> 31 32 #define ALIGN (sizeof(size_t)) 33 #define ONES ((size_t)-1 / UCHAR_MAX) 34 #define HIGHS (ONES * (UCHAR_MAX / 2 + 1)) 35 #define HASZERO(x) (((x)-ONES) & ~(x)&HIGHS) 36 37 char *__strchrnul(const char *, int); 38 39 char * 40 __strchrnul(const char *s, int c) 41 { 42 c = (unsigned char)c; 43 if (!c) 44 return (char *)s + strlen(s); 45 46 #ifdef __GNUC__ 47 typedef size_t __attribute__((__may_alias__)) word; 48 const word *w; 49 for (; (uintptr_t)s % ALIGN; s++) 50 if (!*s || *(unsigned char *)s == c) 51 return (char *)s; 52 size_t k = ONES * c; 53 for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w ^ k); w++) 54 ; 55 s = (void *)w; 56 #endif 57 for (; *s && *(unsigned char *)s != c; s++) 58 ; 59 return (char *)s; 60 } 61 62 __weak_reference(__strchrnul, strchrnul); 63