2.11BSD#431 - /usr/src/lib/libc/string/strsep.c

   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: #include <sys/types.h>
  35: #include <string.h>
  36: #include <stdio.h>
  37: 
  38: #if defined(LIBC_SCCS) && !defined(lint)
  39: static char sccsid[] = "@(#)strsep.c	8.1.1 (2.11BSD) 1996/1/11";
  40: #endif /* LIBC_SCCS and not lint */
  41: 
  42: /*
  43:  * Get next token from string *stringp, where tokens are possibly-empty
  44:  * strings separated by characters from delim.
  45:  *
  46:  * Writes NULs into the string at *stringp to end tokens.
  47:  * delim need not remain constant from call to call.
  48:  * On return, *stringp points past the last NUL written (if there might
  49:  * be further tokens), or is NULL (if there are definitely no more tokens).
  50:  *
  51:  * If *stringp is NULL, strsep returns NULL.
  52:  */
  53: char *
  54: strsep(stringp, delim)
  55:     register char **stringp;
  56:     char *delim;
  57: {
  58:     register char *s;
  59:     register char *spanp;
  60:     int c, sc;
  61:     char *tok;
  62: 
  63:     if ((s = *stringp) == NULL)
  64:         return (NULL);
  65:     for (tok = s;;) {
  66:         c = *s++;
  67:         spanp = delim;
  68:         do {
  69:             if ((sc = *spanp++) == c) {
  70:                 if (c == 0)
  71:                     s = NULL;
  72:                 else
  73:                     s[-1] = 0;
  74:                 *stringp = s;
  75:                 return (tok);
  76:             }
  77:         } while (sc != 0);
  78:     }
  79:     /* NOTREACHED */
  80: }

Defined functions

Defined variables