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/* Declarations for getopt.
* Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
*
* NOTE: The canonical source of this file is maintained with the GNU C Library.
* Bugs can be reported to bug-glibc@gnu.org.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _GETOPT_H
#define _GETOPT_H 1
/*
* The operating system may or may not provide getopt_long(), and if
* so it may or may not be a version we are willing to use. Our
* strategy is to declare getopt here, and then provide code unless
* the supplied version is adequate. The difficult case is when a
* declaration for getopt is provided, as our declaration must match.
*
* XXX Arguably this version should be named differently, and the
* local names defined to refer to the system version when we choose
* to use the system version.
*/
#ifdef __cplusplus
extern "C" {
#endif
/* 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. */
extern 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 -1, 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. */
extern int optind;
/* Callers store zero here to inhibit the error message `getopt' prints
for unrecognized options. */
extern int opterr;
/* Set to an option character which was unrecognized. */
extern int optopt;
/* Describe the long-named options requested by the application.
The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
of `struct option' terminated by an element containing a name which is
zero.
The field `has_arg' is:
no_argument (or 0) if the option does not take an argument,
required_argument (or 1) if the option requires an argument,
optional_argument (or 2) if the option takes an optional argument.
If the field `flag' is not NULL, it points to a variable that is set
to the value given in the field `val' when the option is found, but
left unchanged if the option is not found.
To have a long-named option do something other than set an `int' to
a compiled-in constant, such as set a value from `optarg', set the
option's `flag' field to zero and its `val' field to a nonzero
value (the equivalent single-letter option character, if there is
one). For long options that have a zero `flag' field, `getopt'
returns the contents of the `val' field. */
struct option {
#if defined(__STDC__) && __STDC__
const char *name;
#else
char *name;
#endif
/* has_arg can't be an enum because some compilers complain about
type mismatches in all the code that assumes it is an int. */
int has_arg;
int *flag;
int val;
};
/* Names for the values of the `has_arg' field of `struct option'. */
#define no_argument 0
#define required_argument 1
#define optional_argument 2
#if defined(__STDC__) && __STDC__
#ifdef REALLY_NEED_PLAIN_GETOPT
/*
* getopt is defined in POSIX.2. Assume that if the system defines
* getopt that it complies with POSIX.2. If not, an autoconf test
* should be written to define NONPOSIX_GETOPT_DEFINITION.
*/
#ifndef NONPOSIX_GETOPT_DEFINITION
extern int getopt(int argc, char *const *argv, const char *shortopts);
#else /* NONPOSIX_GETOPT_DEFINITION */
extern int getopt(void);
#endif /* NONPOSIX_GETOPT_DEFINITION */
#endif
extern int getopt_long(int argc, char *const *argv, const char *shortopts,
const struct option *longopts, int *longind);
extern int getopt_long_only(int argc, char *const *argv, const char *shortopts,
const struct option *longopts, int *longind);
/* Internal only. Users should not call this directly. */
extern int _getopt_internal(int argc, char *const *argv, const char *shortopts,
const struct option *longopts, int *longind,
int long_only);
#else /* not __STDC__ */
#ifdef REALLY_NEED_PLAIN_GETOPT
extern int getopt();
#endif /* REALLY_NEED_PLAIN_GETOPT */
extern int getopt_long();
extern int getopt_long_only();
extern int _getopt_internal();
#endif /* __STDC__ */
#ifdef __cplusplus
}
#endif
#endif /* getopt.h */
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