contrib/bind-9.5.2/lib/bind/bsd/strsep.c

   1 #if defined(LIBC_SCCS) && !defined(lint)
   2 static const char sccsid[] = "strsep.c  8.1 (Berkeley) 6/4/93";
   3 static const char rcsid[] = "$Id: strsep.c,v 1.2 2005/04/27 04:56:12 sra Exp $";
   4 #endif /* LIBC_SCCS and not lint */
   5
   6 /*
   7  * Copyright (c) 1990, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include "port_before.h"
  40 #include <sys/cdefs.h>
  41 #include <string.h>
  42 #include <stdio.h>
  43 #include "port_after.h"
  44
  45 #ifndef NEED_STRSEP
  46 int __strsep_unneeded__;
  47 #else
  48
  49 /*%
  50  * Get next token from string *stringp, where tokens are possibly-empty
  51  * strings separated by characters from delim.
  52  *
  53  * Writes NULs into the string at *stringp to end tokens.
  54  * delim need not remain constant from call to call.
  55  * On return, *stringp points past the last NUL written (if there might
  56  * be further tokens), or is NULL (if there are definitely no more tokens).
  57  *
  58  * If *stringp is NULL, strsep returns NULL.
  59  */
  60 char *
  61 strsep(char **stringp, const char *delim) {
  62         char *s;
  63         const char *spanp;
  64         int c, sc;
  65         char *tok;
  66
  67         if ((s = *stringp) == NULL)
  68                 return (NULL);
  69         for (tok = s;;) {
  70                 c = *s++;
  71                 spanp = delim;
  72                 do {
  73                         if ((sc = *spanp++) == c) {
  74                                 if (c == 0)
  75                                         s = NULL;
  76                                 else
  77                                         s[-1] = 0;
  78                                 *stringp = s;
  79                                 return (tok);
  80                         }
  81                 } while (sc != 0);
  82         }
  83         /* NOTREACHED */
  84 }
  85
  86 #endif /*NEED_STRSEP*/
  87
  88 /*! \file */