47d8ee4167
initially used by i386's Multiboot support but will be useful in other situations too (think refactoring mount(2)'s API).
89 lines
3.2 KiB
Groff
89 lines
3.2 KiB
Groff
.\" $NetBSD: optstr.9,v 1.1 2006/02/03 11:04:46 jmmv 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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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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.Dd February 3, 2006
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.Dt OPTSTR 9
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.Os
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.Sh NAME
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.Nm optstr_get
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.Nd Options string management
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.Sh SYNOPSIS
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.In sys/optstr.h
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.Ft boolean_t
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.Fn optstr_get "const char *optstr" "const char *key" "char *buf" "size_t bufsize"
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.Sh DESCRIPTION
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An options string is a list of key/value pairs represented in textual form.
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Each pair is expressed as
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.Sq 'key=value'
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and is separated from other pairs by one or more spaces.
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For example:
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.Bd -literal
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key1=value1 key2=value2 key3=value3
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.Ed
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.Pp
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Options strings are used to pass information between userland programs and
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the kernel in a binary-agnostic way.
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This makes them endianness and ABI independent.
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.Sh FUNCTIONS
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The following functions are provided to manage options strings:
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.Bl -tag -width compact
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.It Fn optstr_get "optstr" "key" "buf" "bufsize"
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Scans the
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.Va optstr
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options string looking for the key
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.Va key
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and stores its value in the buffer pointed to by
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.Va buf
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copying a maximum of
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.Va bufsize
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bytes.
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Returns
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.Sq TRUE
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if the key was found or
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.Sq FALSE
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otherwise, in which case
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.Va buf
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is left unmodified.
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.El
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.Sh CODE REFERENCES
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The options string management functions are implemented within the files
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.Pa sys/kern/subr_optstr.c
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and
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.Pa sys/sys/optstr.h .
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.Sh HISTORY
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Options strings appeared in
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.Nx 4.0 .
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