usr/src/lib/libbc/libc/gen/common/getsubopt.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1990 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28           /* created from scratch */
  29
  30 /*
  31  * getsubopt - parse suboptions from a flag argument.
  32  */
  33 #include <string.h>
  34 #include <stdio.h>
  35
  36 int
  37 getsubopt(optionsp, tokens, valuep)
  38         char **optionsp;
  39         char *tokens[];
  40         char **valuep;
  41 {
  42         register char *s = *optionsp, *p;
  43         register int i, optlen;
  44
  45         *valuep = NULL;
  46         if (*s == '\0')
  47                 return (-1);
  48         p = strchr(s, ',');             /* find next option */
  49         if (p == NULL) {
  50                 p = s + strlen(s);
  51         } else {
  52                 *p++ = '\0';            /* mark end and point to next */
  53         }
  54         *optionsp = p;                  /* point to next option */
  55         p = strchr(s, '=');             /* find value */
  56         if (p == NULL) {
  57                 optlen = strlen(s);
  58                 *valuep = NULL;
  59         } else {
  60                 optlen = p - s;
  61                 *valuep = ++p;
  62         }
  63         for (i = 0; tokens[i] != NULL; i++) {
  64                 if ((optlen == strlen(tokens[i])) &&
  65                     (strncmp(s, tokens[i], optlen) == 0))
  66                         return (i);
  67         }
  68         /* no match, point value at option and return error */
  69         *valuep = s;
  70         return (-1);
  71 }
  72