GetOpt.h
/* Getopt for GNU.
Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
(Modified by Douglas C. Schmidt for use with GNU G++.)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA.
*/
/* This version of `getopt' appears to the caller like standard Unix `getopt'
but it behaves differently for the user, since it allows the user
to intersperse the options with the other arguments.
As `getopt' works, it permutes the elements of `argv' so that,
when it is done, all the options precede everything else. Thus
all application programs are extended to handle flexible argument order.
Setting the environment variable _POSIX_OPTION_ORDER disables permutation.
Then the behavior is completely standard.
GNU application programs can use a third alternative mode in which
they can distinguish the relative order of options and other arguments. */
#ifndef GetOpt_h
#define GetOpt_h 1
// #include <stdio.h>
class GetOpt
{
private:
/* The next char to be scanned in the option-element
in which the last option character we returned was found.
This allows us to pick up the scan where we left off.
If this is zero, or a null string, it means resume the scan
by advancing to the next ARGV-element. */
static char *nextchar;
/* Describe how to deal with options that follow non-option ARGV-elements.
UNSPECIFIED means the caller did not specify anything;
the default is then REQUIRE_ORDER if the environment variable
_OPTIONS_FIRST is defined, PERMUTE otherwise.
REQUIRE_ORDER means don't recognize them as options.
Stop option processing when the first non-option is seen.
This is what Unix does.
PERMUTE is the default. We permute the contents of `argv' as we scan,
so that eventually all the options are at the end. This allows options
to be given in any order, even with programs that were not written to
expect this.
RETURN_IN_ORDER is an option available to programs that were written
to expect options and other ARGV-elements in any order and that care about
the ordering of the two. We describe each non-option ARGV-element
as if it were the argument of an option with character code zero.
Using `-' as the first character of the list of option characters
requests this mode of operation.
The special argument `--' forces an end of option-scanning regardless
of the value of `ordering'. In the case of RETURN_IN_ORDER, only
`--' can cause `getopt' to return EOF with `optind' != ARGC. */
enum OrderingEnum { REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER };
OrderingEnum ordering;
/* Handle permutation of arguments. */
/* Describe the part of ARGV that contains non-options that have
been skipped. `first_nonopt' is the index in ARGV of the first of them;
`last_nonopt' is the index after the last of them. */
static int first_nonopt;
static int last_nonopt;
void exchange (char **argv);
public:
/* For communication from `getopt' to the caller.
When `getopt' finds an option that takes an argument,
the argument value is returned here.
Also, when `ordering' is RETURN_IN_ORDER,
each non-option ARGV-element is returned here. */
char *optarg;
/* Index in ARGV of the next element to be scanned.
This is used for communication to and from the caller
and for communication between successive calls to `getopt'.
On entry to `getopt', zero means this is the first call; initialize.
When `getopt' returns EOF, this is the index of the first of the
non-option elements that the caller should itself scan.
Otherwise, `optind' communicates from one call to the next
how much of ARGV has been scanned so far. */
int optind;
/* Callers store zero here to inhibit the error message
for unrecognized options. */
int opterr;
int nargc;
char **nargv;
const char *noptstring;
GetOpt (int argc, char **argv, const char *optstring);
int operator () (void);
};
#endif
GetOpt
Definition GetOpt.h:39