strsep.c

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    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 #if defined(LIBC_SCCS) && !defined(lint)
   35 static char sccsid[] = "@(#)strsep.c    8.1 (Berkeley) 6/4/93";
   36 #endif /* LIBC_SCCS and not lint */
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/5.1/sys/libkern/strsep.c 104799 2002-10-10 17:02:11Z rwatson $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/libkern.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 char *
   55 strsep(stringp, delim)
   56         char **stringp;
   57         const char *delim;
   58 {
   59         char *s;
   60         const char *spanp;
   61         int c, sc;
   62         char *tok;
   63 
   64         if ((s = *stringp) == NULL)
   65                 return (NULL);
   66         for (tok = s;;) {
   67                 c = *s++;
   68                 spanp = delim;
   69                 do {
   70                         if ((sc = *spanp++) == c) {
   71                                 if (c == 0)
   72                                         s = NULL;
   73                                 else
   74                                         s[-1] = 0;
   75                                 *stringp = s;
   76                                 return (tok);
   77                         }
   78                 } while (sc != 0);
   79         }
   80         /* NOTREACHED */
   81 }

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FreeBSD/Linux Kernel Cross Reference sys/libkern/strsep.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/strsep.c