1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 #include <sys/param.h> 37 #include <sys/libkern.h> 38 39 /* 40 * Get next token from string *stringp, where tokens are possibly-empty 41 * strings separated by characters from delim. 42 * 43 * Writes NULs into the string at *stringp to end tokens. 44 * delim need not remain constant from call to call. 45 * On return, *stringp points past the last NUL written (if there might 46 * be further tokens), or is NULL (if there are definitely no more tokens). 47 * 48 * If *stringp is NULL, strsep returns NULL. 49 */ 50 char * 51 strsep(char **stringp, const char *delim) 52 { 53 char *s; 54 const char *spanp; 55 int c, sc; 56 char *tok; 57 58 if ((s = *stringp) == NULL) 59 return (NULL); 60 for (tok = s;;) { 61 c = *s++; 62 spanp = delim; 63 do { 64 if ((sc = *spanp++) == c) { 65 if (c == '\0') 66 s = NULL; 67 else 68 s[-1] = '\0'; 69 *stringp = s; 70 return (tok); 71 } 72 } while (sc != '\0'); 73 } 74 /* NOTREACHED */ 75 } 76