1 /* $NetBSD: strsep.c,v 1.2 2007/02/19 18:33:09 chs 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 <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: strsep.c,v 1.2 2007/02/19 18:33:09 chs Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #if !defined(_KERNEL) && !defined(_STANDALONE) 42 #include "namespace.h" 43 44 #include <assert.h> 45 #include <string.h> 46 47 #ifdef __weak_alias 48 __weak_alias(strsep,_strsep) 49 #endif 50 51 #else 52 #include <sys/param.h> 53 #include <lib/libkern/libkern.h> 54 #endif /* !_KERNEL && !_STANDALONE */ 55 56 #if !HAVE_STRSEP 57 /* 58 * Get next token from string *stringp, where tokens are possibly-empty 59 * strings separated by characters from delim. 60 * 61 * Writes NULs into the string at *stringp to end tokens. 62 * delim need not remain constant from call to call. 63 * On return, *stringp points past the last NUL written (if there might 64 * be further tokens), or is NULL (if there are definitely no more tokens). 65 * 66 * If *stringp is NULL, strsep returns NULL. 67 */ 68 char * 69 strsep(stringp, delim) 70 char **stringp; 71 const char *delim; 72 { 73 char *s; 74 const char *spanp; 75 int c, sc; 76 char *tok; 77 78 _DIAGASSERT(stringp != NULL); 79 _DIAGASSERT(delim != NULL); 80 81 if ((s = *stringp) == NULL) 82 return (NULL); 83 for (tok = s;;) { 84 c = *s++; 85 spanp = delim; 86 do { 87 if ((sc = *spanp++) == c) { 88 if (c == 0) 89 s = NULL; 90 else 91 s[-1] = 0; 92 *stringp = s; 93 return (tok); 94 } 95 } while (sc != 0); 96 } 97 /* NOTREACHED */ 98 } 99 #endif 100