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 <string.h> 36 #include <stdio.h> 37 38 /* 39 * Get next token from string *stringp, where tokens are possibly-empty 40 * strings separated by characters from delim. 41 * 42 * Writes NULs into the string at *stringp to end tokens. 43 * delim need not remain constant from call to call. 44 * On return, *stringp points past the last NUL written (if there might 45 * be further tokens), or is NULL (if there are definitely no more tokens). 46 * 47 * If *stringp is NULL, strsep returns NULL. 48 */ 49 char * 50 strsep(char **stringp, const char *delim) 51 { 52 char *s; 53 const char *spanp; 54 int c, sc; 55 char *tok; 56 57 if ((s = *stringp) == NULL) 58 return (NULL); 59 for (tok = s;;) { 60 c = *s++; 61 spanp = delim; 62 do { 63 if ((sc = *spanp++) == c) { 64 if (c == 0) 65 s = NULL; 66 else 67 s[-1] = 0; 68 *stringp = s; 69 return (tok); 70 } 71 } while (sc != 0); 72 } 73 /* NOTREACHED */ 74 } 75