00001 /* $NetBSD: strsep.c,v 1.14 2003/08/07 16:43:52 agc Exp $ */ 00002 00003 /*- 00004 * Copyright (c) 1990, 1993 00005 * The Regents of the University of California. All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions 00009 * are met: 00010 * 1. Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 2. Redistributions in binary form must reproduce the above copyright 00013 * notice, this list of conditions and the following disclaimer in the 00014 * documentation and/or other materials provided with the distribution. 00015 * 3. Neither the name of the University nor the names of its contributors 00016 * may be used to endorse or promote products derived from this software 00017 * without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00024 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00025 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00026 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00027 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00028 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00029 * SUCH DAMAGE. 00030 */ 00031 00032 #include <u/missing/strsep.h> 00033 00034 #ifndef HAVE_STRSEP 00035 00036 #include <stdio.h> 00037 00038 /* 00039 * Get next token from string *stringp, where tokens are possibly-empty 00040 * strings separated by characters from delim. 00041 * 00042 * Writes NULs into the string at *stringp to end tokens. 00043 * delim need not remain constant from call to call. 00044 * On return, *stringp points past the last NUL written (if there might 00045 * be further tokens), or is NULL (if there are definitely no more tokens). 00046 * 00047 * If *stringp is NULL, strsep returns NULL. 00048 */ 00049 char *strsep(char **stringp, const char *delim) 00050 { 00051 char *s; 00052 const char *spanp; 00053 int c, sc; 00054 char *tok; 00055 00056 if ((s = *stringp) == NULL) 00057 return (NULL); 00058 00059 for (tok = s;;) { 00060 c = *s++; 00061 spanp = delim; 00062 do { 00063 if ((sc = *spanp++) == c) { 00064 if (c == 0) 00065 s = NULL; 00066 else 00067 s[-1] = 0; 00068 *stringp = s; 00069 return (tok); 00070 } 00071 } while (sc != 0); 00072 } 00073 /* NOTREACHED */ 00074 } 00075 00076 #else /* HAVE_STRSEP */ 00077 char *strsep(char **, const char *); 00078 #endif /* !HAVE_STRSEP */ 00079