1 /* $OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <string.h> 37 #include <stdio.h> 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 #if 0 41 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 42 #else 43 static char *rcsid = "$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $"; 44 #endif 45 #endif /* LIBC_SCCS and not lint */ 46 47 /* 48 * Get next token from string *stringp, where tokens are possibly-empty 49 * strings separated by characters from delim. 50 * 51 * Writes NULs into the string at *stringp to end tokens. 52 * delim need not remain constant from call to call. 53 * On return, *stringp points past the last NUL written (if there might 54 * be further tokens), or is NULL (if there are definitely no more tokens). 55 * 56 * If *stringp is NULL, strsep returns NULL. 57 */ 58 char * 59 strsep(stringp, delim) 60 register char **stringp; 61 register const char *delim; 62 { 63 register char *s; 64 register const char *spanp; 65 register int c, sc; 66 char *tok; 67 68 if ((s = *stringp) == NULL) 69 return (NULL); 70 for (tok = s;;) { 71 c = *s++; 72 spanp = delim; 73 do { 74 if ((sc = *spanp++) == c) { 75 if (c == 0) 76 s = NULL; 77 else 78 s[-1] = 0; 79 *stringp = s; 80 return (tok); 81 } 82 } while (sc != 0); 83 } 84 /* NOTREACHED */ 85 } 86