95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/* $NetBSD: subr_optstr.c,v 1.5 2008/04/28 20:24:04 martin Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_optstr.c,v 1.5 2008/04/28 20:24:04 martin Exp $");
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#include <sys/param.h>
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#include <sys/optstr.h>
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/* --------------------------------------------------------------------- */
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/*
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* Given an options string of the form 'a=b c=d ... y=z' and a key,
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* looks for the given key's value in the string and returns it in buf
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* with a maximum of bufsize bytes. If the key is found, returns true;
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* otherwise FALSE.
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*/
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bool
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optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
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{
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bool found;
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found = false;
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/* Skip any initial spaces until we find a word. */
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while (*optstr == ' ' && *optstr != '\0')
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optstr++;
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/* Search for the given key within the option string. */
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while (!found && *optstr != '\0') {
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const char *keyp;
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/* Check if the next word matches the key. */
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keyp = key;
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while (*optstr == *keyp) {
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optstr++;
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keyp++;
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}
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if (*optstr == '=' && *keyp == '\0')
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found = true;
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else {
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/* Key not found; skip until next space. */
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while (*optstr != ' ' && *optstr != '\0')
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optstr++;
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/* And now skip until next word. */
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while (*optstr == ' ' && *optstr != '\0')
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optstr++;
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}
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}
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/* If the key was found; copy its value to the target buffer. */
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if (found) {
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const char *lastbuf;
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lastbuf = buf + (bufsize - 1);
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optstr++; /* Skip '='. */
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while (buf != lastbuf && *optstr != ' ' && *optstr != '\0')
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*buf++ = *optstr++;
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*buf = '\0';
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}
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return found;
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}
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