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getopt.h
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getopt.h
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/* Declarations for getopt.
Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
This file was modified slightly by Ian Lance Taylor, November 1992,
for Taylor UUCP, and again in June, 1995. */
#ifndef _GETOPT_H
#define _GETOPT_H 1
#ifdef __cplusplus
extern "C" {
#endif
/* Ian Lance Taylor <[email protected]> added the following defines for
Taylor UUCP. This avoids reported conflicts with system getopt
definitions. */
#define getopt gnu_getopt
#define optarg gnu_optarg
#define optind gnu_optind
#define opterr gnu_opterr
/* 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 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. */
extern int optind;
/* Callers store zero here to inhibit the error message `getopt' prints
for unrecognized options. */
extern int opterr;
/* 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
{
const char *name;
/* 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'. */
enum _argtype
{
no_argument,
required_argument,
optional_argument
};
#ifndef P
/* On some systems, <stdio.h> includes getopt.h before P is defined by
uucp.h, and the -I arguments cause this version of getopt.h to be
included. Work around that here. */
#define P(x) ()
#define UNDEFINE_P
#endif
extern int getopt P((int argc, char *const *argv, const char *shortopts));
extern int getopt_long P((int argc, char *const *argv, const char *shortopts,
const struct option *longopts, int *longind));
extern int getopt_long_only P((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 P((int argc, char *const *argv,
const char *shortopts,
const struct option *longopts, int *longind,
int long_only));
#ifdef UNDEFINE_P
#undef P
#undef UNDEFINE_P
#endif
#ifdef __cplusplus
}
#endif
#endif /* _GETOPT_H */