contrib/bmake/stresep.c

   1 /*      $NetBSD: stresep.c,v 1.2 2007/12/06 22:07:07 seb Exp $  */
   2
   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 #ifdef HAVE_CONFIG_H
  33 # include <config.h>
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37
  38 #include <assert.h>
  39 #include <string.h>
  40
  41 #if !defined(HAVE_STRESEP)
  42 char * stresep(char **stringp, const char *delim, int esc);
  43 /*
  44  * Get next token from string *stringp, where tokens are possibly-empty
  45  * strings separated by characters from delim. If esc is not NUL, then
  46  * the characters followed by esc are ignored and are not taken into account
  47  * when splitting the string.
  48  *
  49  * Writes NULs into the string at *stringp to end tokens.
  50  * delim need not remain constant from call to call.
  51  * On return, *stringp points past the last NUL written (if there might
  52  * be further tokens), or is NULL (if there are definitely no more tokens).
  53  *
  54  * If *stringp is NULL, stresep returns NULL.
  55  */
  56 char *
  57 stresep(char **stringp, const char *delim, int esc)
  58 {
  59         char *s;
  60         const char *spanp;
  61         int c, sc;
  62         char *tok;
  63
  64         if (stringp == NULL || delim == NULL)
  65                 return NULL;
  66
  67         if ((s = *stringp) == NULL)
  68                 return NULL;
  69         for (tok = s;;) {
  70                 c = *s++;
  71                 while (esc != '\0' && c == esc) {
  72                         (void)strcpy(s - 1, s);
  73                         c = *s++;
  74                 }
  75                 spanp = delim;
  76                 do {
  77                         if ((sc = *spanp++) == c) {
  78                                 if (c == 0)
  79                                         s = NULL;
  80                                 else
  81                                         s[-1] = 0;
  82                                 *stringp = s;
  83                                 return tok;
  84                         }
  85                 } while (sc != 0);
  86         }
  87 }
  88 #endif
  89