146 lines
4.0 KiB
Groff
146 lines
4.0 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getsubopt.3 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD: src/lib/libc/stdlib/getsubopt.3,v 1.9 2001/09/07 14:46:35 asmodai Exp $
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.\"
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.Dd June 9, 1993
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.Dt GETSUBOPT 3
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.Os
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.Sh NAME
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.Nm getsubopt
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.Nd get sub options from an argument
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Vt extern char *suboptarg ;
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.Ft int
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.Fn getsubopt "char **optionp" "char * const *tokens" "char **valuep"
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.Sh DESCRIPTION
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The
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.Fn getsubopt
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function
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parses a string containing tokens delimited by one or more tab, space or
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comma
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.Pq Ql \&,
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characters.
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It is intended for use in parsing groups of option arguments provided
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as part of a utility command line.
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.Pp
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The argument
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.Fa optionp
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is a pointer to a pointer to the string.
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The argument
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.Fa tokens
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is a pointer to a
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.Dv NULL Ns -terminated
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array of pointers to strings.
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.Pp
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The
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.Fn getsubopt
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function
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returns the zero-based offset of the pointer in the
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.Fa tokens
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array referencing a string which matches the first token
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in the string, or, \-1 if the string contains no tokens or
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.Fa tokens
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does not contain a matching string.
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.Pp
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If the token is of the form ``name=value'', the location referenced by
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.Fa valuep
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will be set to point to the start of the ``value'' portion of the token.
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.Pp
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On return from
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.Fn getsubopt ,
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.Fa optionp
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will be set to point to the start of the next token in the string,
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or the null at the end of the string if no more tokens are present.
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The external variable
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.Fa suboptarg
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will be set to point to the start of the current token, or
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.Dv NULL
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if no
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tokens were present.
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The argument
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.Fa valuep
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will be set to point to the ``value'' portion of the token, or
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.Dv NULL
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if no ``value'' portion was present.
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.Sh EXAMPLES
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.Bd -literal -compact
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char *tokens[] = {
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#define ONE 0
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"one",
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#define TWO 1
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"two",
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NULL
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};
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\&...
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extern char *optarg, *suboptarg;
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char *options, *value;
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while ((ch = getopt(argc, argv, "ab:")) != \-1) {
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switch(ch) {
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case 'a':
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/* process ``a'' option */
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break;
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case 'b':
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options = optarg;
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while (*options) {
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switch(getsubopt(&options, tokens, &value)) {
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case ONE:
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/* process ``one'' sub option */
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break;
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case TWO:
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/* process ``two'' sub option */
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if (!value)
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error("no value for two");
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i = atoi(value);
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break;
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case \-1:
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if (suboptarg)
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error("illegal sub option %s",
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suboptarg);
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else
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error("missing sub option");
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break;
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}
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break;
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}
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.Ed
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.Sh SEE ALSO
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.Xr getopt 3 ,
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.Xr strsep 3
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.Sh HISTORY
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The
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.Fn getsubopt
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function first appeared in
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.Bx 4.4 .
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