compat_getsubopt.c

   1 /*      $Id: compat_getsubopt.c,v 1.6 2020/06/15 01:37:15 schwarze Exp $ */
   2 /*      $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $     */
   3
   4 /*-
   5  * Copyright (c) 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 #include "config.h"
  33
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37
  38 int
  39 getsubopt(char **optionp, char * const *tokens, char **valuep)
  40 {
  41         int cnt;
  42         char *suboptarg;
  43         char *p;
  44
  45         suboptarg = *valuep = NULL;
  46
  47         if (!optionp || !*optionp)
  48                 return(-1);
  49
  50         /* skip leading white-space, commas */
  51         for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  52
  53         if (!*p) {
  54                 *optionp = p;
  55                 return(-1);
  56         }
  57
  58         /* save the start of the token, and skip the rest of the token. */
  59         for (suboptarg = p;
  60             *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
  61
  62         if (*p) {
  63                 /*
  64                  * If there's an equals sign, set the value pointer, and
  65                  * skip over the value part of the token.  Terminate the
  66                  * token.
  67                  */
  68                 if (*p == '=') {
  69                         *p = '\0';
  70                         for (*valuep = ++p;
  71                             *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
  72                         if (*p)
  73                                 *p++ = '\0';
  74                 } else
  75                         *p++ = '\0';
  76                 /* Skip any whitespace or commas after this token. */
  77                 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
  78         }
  79
  80         /* set optionp for next round. */
  81         *optionp = p;
  82
  83         for (cnt = 0; *tokens; ++tokens, ++cnt)
  84                 if (!strcmp(suboptarg, *tokens))
  85                         return(cnt);
  86         return(-1);
  87 }