mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
bd45f5676d
to make the examples reflect reality more closely. MFC after: 1 week X-MFC-After: 9.0-RELEASE
148 lines
4.0 KiB
Groff
148 lines
4.0 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)getsubopt.3 8.1 (Berkeley) 6/9/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 25, 2011
|
|
.Dt GETSUBOPT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getsubopt
|
|
.Nd get sub options from an argument
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In stdlib.h
|
|
.Vt extern char *suboptarg ;
|
|
.Ft int
|
|
.Fn getsubopt "char **optionp" "char * const *tokens" "char **valuep"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getsubopt
|
|
function
|
|
parses a string containing tokens delimited by one or more tab, space or
|
|
comma
|
|
.Pq Ql \&,
|
|
characters.
|
|
It is intended for use in parsing groups of option arguments provided
|
|
as part of a utility command line.
|
|
.Pp
|
|
The argument
|
|
.Fa optionp
|
|
is a pointer to a pointer to the string.
|
|
The argument
|
|
.Fa tokens
|
|
is a pointer to a
|
|
.Dv NULL Ns -terminated
|
|
array of pointers to strings.
|
|
.Pp
|
|
The
|
|
.Fn getsubopt
|
|
function
|
|
returns the zero-based offset of the pointer in the
|
|
.Fa tokens
|
|
array referencing a string which matches the first token
|
|
in the string, or, \-1 if the string contains no tokens or
|
|
.Fa tokens
|
|
does not contain a matching string.
|
|
.Pp
|
|
If the token is of the form ``name=value'', the location referenced by
|
|
.Fa valuep
|
|
will be set to point to the start of the ``value'' portion of the token.
|
|
.Pp
|
|
On return from
|
|
.Fn getsubopt ,
|
|
.Fa optionp
|
|
will be set to point to the start of the next token in the string,
|
|
or the null at the end of the string if no more tokens are present.
|
|
The external variable
|
|
.Fa suboptarg
|
|
will be set to point to the start of the current token, or
|
|
.Dv NULL
|
|
if no
|
|
tokens were present.
|
|
The argument
|
|
.Fa valuep
|
|
will be set to point to the ``value'' portion of the token, or
|
|
.Dv NULL
|
|
if no ``value'' portion was present.
|
|
.Sh EXAMPLES
|
|
.Bd -literal -compact
|
|
char *tokens[] = {
|
|
#define ONE 0
|
|
"one",
|
|
#define TWO 1
|
|
"two",
|
|
NULL
|
|
};
|
|
|
|
\&...
|
|
|
|
extern char *optarg, *suboptarg;
|
|
char *options, *value;
|
|
|
|
while ((ch = getopt(argc, argv, "ab:")) != \-1) {
|
|
switch(ch) {
|
|
case 'a':
|
|
/* process ``a'' option */
|
|
break;
|
|
case 'b':
|
|
options = optarg;
|
|
while (*options) {
|
|
switch(getsubopt(&options, tokens, &value)) {
|
|
case ONE:
|
|
/* process ``one'' sub option */
|
|
break;
|
|
case TWO:
|
|
/* process ``two'' sub option */
|
|
if (!value)
|
|
error("no value for two");
|
|
i = atoi(value);
|
|
break;
|
|
case \-1:
|
|
if (suboptarg)
|
|
error("illegal sub option %s",
|
|
suboptarg);
|
|
else
|
|
error("missing sub option");
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr getopt 3 ,
|
|
.Xr strsep 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getsubopt
|
|
function first appeared in
|
|
.Bx 4.4 .
|