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-.\" 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
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-.\"     @(#)getsubopt.3	8.1 (Berkeley) 6/9/93
-.\" $FreeBSD: src/lib/libc/stdlib/getsubopt.3,v 1.11 2007/01/09 00:28:10 imp Exp $
-.\"
-.Dd June 9, 1993
-.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
-.Fo getsubopt
-.Fa "char **optionp"
-.Fa "char *const *keylistp"
-.Fa "char **valuep"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn getsubopt
-function
-parses a string containing tokens that are delimited
-by one or more tab, space, or comma
-.Pq Ql \&,
-characters.
-It is intended for use in parsing groups of option arguments
-that are 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 keylistp
-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 keylistp
-array, referencing a string which matches the first token in the string
- or \-1 if the string contains no tokens or
-.Fa keylistp
-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 *keylistp[] = {
-	#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, keylistp, &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 .