compat_getsubopt.c

   1 #ifdef HAVE_GETSUBOPT
   2
   3 int dummy;
   4
   5 #else
   6
   7 /*      $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $     */
   8
   9 /*-
  10  * Copyright (c) 1990, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #include <unistd.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 /*
  43  * The SVID interface to getsubopt provides no way of figuring out which
  44  * part of the suboptions list wasn't matched.  This makes error messages
  45  * tricky...  The extern variable suboptarg is a pointer to the token
  46  * which didn't match.
  47  */
  48 char *suboptarg;
  49
  50 int
  51 getsubopt(char **optionp, char * const *tokens, char **valuep)
  52 {
  53         int cnt;
  54         char *p;
  55
  56         suboptarg = *valuep = NULL;
  57
  58         if (!optionp || !*optionp)
  59                 return(-1);
  60
  61         /* skip leading white-space, commas */
  62         for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  63
  64         if (!*p) {
  65                 *optionp = p;
  66                 return(-1);
  67         }
  68
  69         /* save the start of the token, and skip the rest of the token. */
  70         for (suboptarg = p;
  71             *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
  72
  73         if (*p) {
  74                 /*
  75                  * If there's an equals sign, set the value pointer, and
  76                  * skip over the value part of the token.  Terminate the
  77                  * token.
  78                  */
  79                 if (*p == '=') {
  80                         *p = '\0';
  81                         for (*valuep = ++p;
  82                             *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
  83                         if (*p)
  84                                 *p++ = '\0';
  85                 } else
  86                         *p++ = '\0';
  87                 /* Skip any whitespace or commas after this token. */
  88                 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  89         }
  90
  91         /* set optionp for next round. */
  92         *optionp = p;
  93
  94         for (cnt = 0; *tokens; ++tokens, ++cnt)
  95                 if (!strcmp(suboptarg, *tokens))
  96                         return(cnt);
  97         return(-1);
  98 }
  99
 100 #endif