The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    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 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char sccsid[] = "@(#)strsep.c    8.1 (Berkeley) 6/4/93";
   34 #endif /* LIBC_SCCS and not lint */
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: head/sys/libkern/strsep.c 329237 2018-02-13 19:17:48Z emaste $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/libkern.h>
   40 
   41 /*
   42  * Get next token from string *stringp, where tokens are possibly-empty
   43  * strings separated by characters from delim.
   44  *
   45  * Writes NULs into the string at *stringp to end tokens.
   46  * delim need not remain constant from call to call.
   47  * On return, *stringp points past the last NUL written (if there might
   48  * be further tokens), or is NULL (if there are definitely no more tokens).
   49  *
   50  * If *stringp is NULL, strsep returns NULL.
   51  */
   52 char *
   53 strsep(char **stringp, const char *delim)
   54 {
   55         char *s;
   56         const char *spanp;
   57         int c, sc;
   58         char *tok;
   59 
   60         if ((s = *stringp) == NULL)
   61                 return (NULL);
   62         for (tok = s;;) {
   63                 c = *s++;
   64                 spanp = delim;
   65                 do {
   66                         if ((sc = *spanp++) == c) {
   67                                 if (c == '\0')
   68                                         s = NULL;
   69                                 else
   70                                         s[-1] = '\0';
   71                                 *stringp = s;
   72                                 return (tok);
   73                         }
   74                 } while (sc != '\0');
   75         }
   76         /* NOTREACHED */
   77 }

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