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getopt.h
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/*****
** ** Module Header ******************************************************* **
** **
** Modules Revision 3.0 **
** Providing a flexible user environment **
** **
** File: getopt.h **
** Revision: 1.1 **
** First Edition: 95/12/20 **
** **
** Authors: Jens Hamisch, [email protected] **
** **
** Description: getopt procedure for the Modules package **
** **
** Exports: getopt Recognition of commadn line options **
** **
** Notes: This is based on the 'Getopt for GNU' from the gcc-2.7.2 **
** compiler. It is preferred to the libc version, because it **
** provides 'long-options'. **
** **
** ************************************************************************ **
****/
/** **/
/** Getopt for GNU. **/
/** NOTE: getopt is now part of the C library, so if you don't know what **/
/** "Keep this file name-space clean" means, talk to [email protected] **/
/** before changing it! **/
/** **/
/** Copyright( C) 1987, 88, 89, 90, 91, 92, 93, 94, 95 **/
/** 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, 675 Mass Ave, Cambridge, MA 02139, USA. **/
/** **/
/** ************************************************************************ **/
/** ** Copyright *********************************************************** **
** **
** Copyright 1991-1994 by John L. Furlan. **
** see LICENSE.GPL, which must be provided, for details **
** **
** ************************************************************************ **/
#ifndef _GETOPT_H
#define _GETOPT_H 1
#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 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;
/**
** 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
/**
** Many other libraries have conflicting prototypes for getopt, with
** differences in the consts, in stdlib.h. To avoid compilation
** errors, only prototype getopt for the GNU C library.
**/
#if defined( __STDC__) && __STDC__
extern int getopt( int argc, char *const *argv, const char *shortopts);
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);
#else /* not __STDC__ */
extern int getopt();
extern int getopt_long();
extern int getopt_long_only();
#endif /* __STDC__ */
#ifdef __cplusplus
}
#endif
#endif /* _GETOPT_H */