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-.\" $OpenBSD: getsubopt.3,v 1.16 2022/08/04 06:20:24 jsg Exp $
-.\"
-.\" 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.
-.\" 3. 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
-.\"
-.Dd $Mdocdate: August 4 2022 $
-.Dt GETSUBOPT 3
-.Os
-.Sh NAME
-.Nm getsubopt
-.Nd get sub options from an argument
-.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
-.Ar name Ns = Ns Ar value ,
-the location referenced by
-.Fa valuep
-will be set to point to the start of the
-.Dq 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 NUL at the end of the string if no more tokens are present.
-The comma, space, or tab character ending the token just parsed,
-and the equal sign separating name and value if any, are replaced
-with NUL bytes in the original
-.Pf * Fa optionp
-input string.
-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
-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 STANDARDS
-The
-.Fn getsubopt
-function conforms to
-.St -p1003.1-2008 .
-.Pp
-Allowing space and tab characters to separate tokens
-and the external variable
-.Va suboptarg
-are extensions to that standard.
-.Sh HISTORY
-The
-.Fn getsubopt
-function first appeared in
-.Bx 4.3 Net/2 .