subr_optstr.c

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    1 /*      $NetBSD: subr_optstr.c,v 1.2 2006/11/04 11:37:12 jmmv Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Julio M. Merino Vidal.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: subr_optstr.c,v 1.2 2006/11/04 11:37:12 jmmv Exp $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/optstr.h>
   44 
   45 /* --------------------------------------------------------------------- */
   46 
   47 /*
   48  * Given an options string of the form 'a=b c=d ... y=z' and a key,
   49  * looks for the given key's value in the string and returns it in buf
   50  * with a maximum of bufsize bytes.  If the key is found, returns TRUE;
   51  * otherwise FALSE.
   52  */
   53 boolean_t
   54 optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
   55 {
   56         boolean_t found;
   57 
   58         found = FALSE;
   59 
   60         /* Skip any initial spaces until we find a word. */
   61         while (*optstr == ' ' && *optstr != '\0')
   62                 optstr++;
   63 
   64         /* Search for the given key within the option string. */
   65         while (!found && *optstr != '\0') {
   66                 const char *keyp;
   67 
   68                 /* Check if the next word matches the key. */
   69                 keyp = key;
   70                 while (*optstr == *keyp) {
   71                         optstr++;
   72                         keyp++;
   73                 }
   74 
   75                 if (*optstr == '=' && *keyp == '\0')
   76                         found = TRUE;
   77                 else {
   78                         /* Key not found; skip until next space. */
   79                         while (*optstr != ' ' && *optstr != '\0')
   80                                 optstr++;
   81 
   82                         /* And now skip until next word. */
   83                         while (*optstr == ' ' && *optstr != '\0')
   84                                 optstr++;
   85                 }
   86         }
   87 
   88         /* If the key was found; copy its value to the target buffer. */
   89         if (found) {
   90                 const char *lastbuf;
   91 
   92                 lastbuf = buf + (bufsize - 1);
   93 
   94                 optstr++; /* Skip '='. */
   95                 while (buf != lastbuf && *optstr != ' ' && *optstr != '\0')
   96                         *buf++ = *optstr++;
   97                 *buf = '\0';
   98         }
   99 
  100         return found;
  101 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_optstr.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_optstr.c