1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)strsep.c 8.1 (Berkeley) 6/4/93 34 * $FreeBSD: src/lib/libc/string/strsep.c,v 1.2.12.1 2001/07/09 23:30:07 obrien Exp $ 35 * $DragonFly: src/lib/libc/string/strsep.c,v 1.4 2005/09/18 16:32:34 asmodai Exp $ 36 */ 37 38 #include <sys/cdefs.h> 39 #include <string.h> 40 #include <stdio.h> 41 42 /* 43 * Get next token from string *stringp, where tokens are possibly-empty 44 * strings separated by characters from delim. 45 * 46 * Writes NULs into the string at *stringp to end tokens. 47 * delim need not remain constant from call to call. 48 * On return, *stringp points past the last NUL written (if there might 49 * be further tokens), or is NULL (if there are definitely no more tokens). 50 * 51 * If *stringp is NULL, strsep returns NULL. 52 */ 53 char * 54 strsep(char **stringp, const char *delim) 55 { 56 char *s; 57 const char *spanp; 58 int c, sc; 59 char *tok; 60 61 if ((s = *stringp) == NULL) 62 return (NULL); 63 for (tok = s;;) { 64 c = *s++; 65 spanp = delim; 66 do { 67 if ((sc = *spanp++) == c) { 68 if (c == 0) 69 s = NULL; 70 else 71 s[-1] = 0; 72 *stringp = s; 73 return (tok); 74 } 75 } while (sc != 0); 76 } 77 /* NOTREACHED */ 78 } 79