usr/src/lib/libc/port/gen/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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * getsubopt - parse suboptions from a flag argument.
  34  */
  35 #pragma weak _getsubopt = getsubopt
  36
  37 #include "lint.h"
  38 #include <sys/types.h>
  39 #include <string.h>
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42
  43 int
  44 getsubopt(char **optionsp, char * const *tokens, char **valuep)
  45 {
  46         char *s = *optionsp, *p;
  47         int i;
  48         size_t optlen;
  49
  50         *valuep = NULL;
  51         if (*s == '\0')
  52                 return (-1);
  53         p = strchr(s, ',');             /* find next option */
  54         if (p == NULL) {
  55                 p = s + strlen(s);
  56         } else {
  57                 *p++ = '\0';            /* mark end and point to next */
  58         }
  59         *optionsp = p;                  /* point to next option */
  60         p = strchr(s, '=');             /* find value */
  61         if (p == NULL) {
  62                 optlen = strlen(s);
  63                 *valuep = NULL;
  64         } else {
  65                 optlen = p - s;
  66                 *valuep = ++p;
  67         }
  68         for (i = 0; tokens[i] != NULL; i++) {
  69                 if ((optlen == strlen(tokens[i])) &&
  70                     (strncmp(s, tokens[i], optlen) == 0))
  71                         return (i);
  72         }
  73         /* no match, point value at option and return error */
  74         *valuep = s;
  75         return (-1);
  76 }