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/* -*- C++ -*- */
//=============================================================================
/**
* @file Get_Opt.h
*
* $Id$
*
* @author Doug Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_GET_OPT_H
#define ACE_GET_OPT_H
#include "ace/pre.h"
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#undef optind
#undef optarg
#undef opterr
/**
* @class ACE_Get_Opt
*
* @brief Iterator for parsing command-line arguments.
*
* This is a C++ wrapper for getopt(3c).
*/
class ACE_Export ACE_Get_Opt
{
public:
/**
* Initialize the internal data when the first call is made. Start
* processing options with <argv>-element 0 + <skip_argv0>; the
* sequence of previously skipped non-option <argv>-elements is
* empty.
*
* <optstring> is a string containing the legitimate option
* characters. A colon in <optstring> means that the previous
* character is an option that wants an argument. The argument is
* taken from the rest of the current <argv>-element, or from the
* following <argv>-element, and returned in <optarg>.
*
* If an option character is seen that is not listed in <optstring>,
* return '?' after printing an error message. If you set <opterr>
* to zero, the error message is suppressed but we still return '?'.
*
* If a char in <optstring> is followed by a colon, that means it
* wants an arg, so the following text in the same <argv>-element,
* or the text of the following <argv>-element, is returned in
* <optarg>.
*/
ACE_Get_Opt (int argc,
ACE_TCHAR **argv,
const ACE_TCHAR *optstring,
int skip_argv0 = 1,
int report_errors = 0);
/// Default dtor.
~ACE_Get_Opt (void);
/**
* Scan elements of <argv> (whose length is <argc>) for option
* characters given in <optstring>.
*
* If an element of <argv> starts with '-', and is not exactly "-"
* or "--", then it is an option element. The characters of this
* element (aside from the initial '-') are option characters. If
* <operator()> is called repeatedly, it returns successively each
* of the option characters from each of the option elements.
*
* If <operator()> finds another option character, it returns that
* character, updating <optind> and <nextchar> so that the next call
* to <operator()> can resume the scan with the following option
* character or <argv>-element.
*
* If there are no more option characters, <operator()> returns
* <EOF>. Then <optind> is the index in <argv> of the first
* <argv>-element that is not an option. (The <argv>-elements have
* been permuted so that those that are not options now come last.)
*/
int operator () (void);
// = Public data members (should be hidden...).
/**
* For communication from <operator()> to the caller. When
* <operator()> finds an option that takes an argument, the argument
* value is returned here.
*/
ACE_TCHAR *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 <operator()>. On entry to
* <operator()>, zero means this is the first call; initialize.
*
* When <get_opt> 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;
/// Holds the <argc> count.
int argc_;
/// Holds the <argv> pointer.
ACE_TCHAR **argv_;
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
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.
*/
ACE_TCHAR *nextchar_;
/// Holds the option string.
const ACE_TCHAR *optstring_;
ACE_UNIMPLEMENTED_FUNC (ACE_Get_Opt (const ACE_Get_Opt &))
ACE_UNIMPLEMENTED_FUNC (ACE_Get_Opt &operator= (const ACE_Get_Opt &))
};
#if defined (__ACE_INLINE__)
#include "ace/Get_Opt.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_GET_OPT_H */
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