strsep.c revision 19305
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 34#include "config.h" 35 36#if defined(LIBC_SCCS) && !defined(lint) 37static const char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 38#endif /* LIBC_SCCS and not lint */ 39 40#include <string.h> 41#include <stdio.h> 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 * PUBLIC: #ifndef HAVE_STRSEP 55 * PUBLIC: char *strsep __P((char **, const char *)); 56 * PUBLIC: #endif 57 */ 58char * 59strsep(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