subr_optstr.c

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    1 /*      $NetBSD: subr_optstr.c,v 1.5 2008/04/28 20:24:04 martin 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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: subr_optstr.c,v 1.5 2008/04/28 20:24:04 martin Exp $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/optstr.h>
   37 
   38 /* --------------------------------------------------------------------- */
   39 
   40 /*
   41  * Given an options string of the form 'a=b c=d ... y=z' and a key,
   42  * looks for the given key's value in the string and returns it in buf
   43  * with a maximum of bufsize bytes.  If the key is found, returns true;
   44  * otherwise FALSE.
   45  */
   46 bool
   47 optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
   48 {
   49         bool found;
   50 
   51         found = false;
   52 
   53         /* Skip any initial spaces until we find a word. */
   54         while (*optstr == ' ' && *optstr != '\0')
   55                 optstr++;
   56 
   57         /* Search for the given key within the option string. */
   58         while (!found && *optstr != '\0') {
   59                 const char *keyp;
   60 
   61                 /* Check if the next word matches the key. */
   62                 keyp = key;
   63                 while (*optstr == *keyp) {
   64                         optstr++;
   65                         keyp++;
   66                 }
   67 
   68                 if (*optstr == '=' && *keyp == '\0')
   69                         found = true;
   70                 else {
   71                         /* Key not found; skip until next space. */
   72                         while (*optstr != ' ' && *optstr != '\0')
   73                                 optstr++;
   74 
   75                         /* And now skip until next word. */
   76                         while (*optstr == ' ' && *optstr != '\0')
   77                                 optstr++;
   78                 }
   79         }
   80 
   81         /* If the key was found; copy its value to the target buffer. */
   82         if (found) {
   83                 const char *lastbuf;
   84 
   85                 lastbuf = buf + (bufsize - 1);
   86 
   87                 optstr++; /* Skip '='. */
   88                 while (buf != lastbuf && *optstr != ' ' && *optstr != '\0')
   89                         *buf++ = *optstr++;
   90                 *buf = '\0';
   91         }
   92 
   93         return found;
   94 }

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

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