1 /*- 2 * Copyright (c) 2023 The FreeBSD Foundation 3 * 4 * This software was developed by Robert Clausecker <fuz@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE 27 */ 28 29 #include <sys/cdefs.h> 30 #include <string.h> 31 32 size_t __strcspn(const char *, const char *); 33 34 /* 35 * We have a fast strcspn() on amd64. Use it over a direct 36 * implementation of strsep for better performance. 37 */ 38 char * 39 strsep(char **stringp, const char *delim) 40 { 41 size_t n; 42 char *s; 43 44 s = *stringp; 45 if (s == NULL) 46 return (NULL); 47 48 n = __strcspn(s, delim); 49 if (s[n] == '\0') 50 *stringp = NULL; 51 else { 52 s[n] = '\0'; 53 *stringp = s + n + 1; 54 } 55 56 return (s); 57 } 58