1 /* $OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $ */ 2 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 #include <string.h> 33 #include <stdio.h> 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 38 #else 39 static char *rcsid = "$OpenBSD: strsep.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $"; 40 #endif 41 #endif /* LIBC_SCCS and not lint */ 42 43 /* 44 * Get next token from string *stringp, where tokens are possibly-empty 45 * strings separated by characters from delim. 46 * 47 * Writes NULs into the string at *stringp to end tokens. 48 * delim need not remain constant from call to call. 49 * On return, *stringp points past the last NUL written (if there might 50 * be further tokens), or is NULL (if there are definitely no more tokens). 51 * 52 * If *stringp is NULL, strsep returns NULL. 53 */ 54 char * 55 strsep(char **stringp, const char *delim) 56 { 57 char *s; 58 const char *spanp; 59 int c, sc; 60 char *tok; 61 62 if ((s = *stringp) == NULL) 63 return (NULL); 64 for (tok = s;;) { 65 c = *s++; 66 spanp = delim; 67 do { 68 if ((sc = *spanp++) == c) { 69 if (c == 0) 70 s = NULL; 71 else 72 s[-1] = 0; 73 *stringp = s; 74 return (tok); 75 } 76 } while (sc != 0); 77 } 78 /* NOTREACHED */ 79 } 80