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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)strsep.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/string/strsep.c,v 1.6 2007/01/09 00:28:12 imp Exp $ 31 * $DragonFly: src/lib/libc/string/strsep.c,v 1.4 2005/09/18 16:32:34 asmodai Exp $ 32 */ 33 34 #include <string.h> 35 #include <stdio.h> 36 37 /* 38 * Get next token from string *stringp, where tokens are possibly-empty 39 * strings separated by characters from delim. 40 * 41 * Writes NULs into the string at *stringp to end tokens. 42 * delim need not remain constant from call to call. 43 * On return, *stringp points past the last NUL written (if there might 44 * be further tokens), or is NULL (if there are definitely no more tokens). 45 * 46 * If *stringp is NULL, strsep returns NULL. 47 */ 48 char * 49 strsep(char **stringp, const char *delim) 50 { 51 char *s; 52 const char *spanp; 53 int c, sc; 54 char *tok; 55 56 if ((s = *stringp) == NULL) 57 return (NULL); 58 for (tok = s;;) { 59 c = *s++; 60 spanp = delim; 61 do { 62 if ((sc = *spanp++) == c) { 63 if (c == 0) 64 s = NULL; 65 else 66 s[-1] = 0; 67 *stringp = s; 68 return (tok); 69 } 70 } while (sc != 0); 71 } 72 /* NOTREACHED */ 73 } 74