getopt.h

众所周知

#ifndef __GETOPT_H__
/* 
 * getopt.h
 *
 * $Id: getopt.h,v 1.3 2008/08/31 22:27:58 keithmarshall Exp $
 *
 * Defines constants and function prototypes required to implement
 * the `getopt', `getopt_long' and `getopt_long_only' APIs.
 *
 * This file is part of the MinGW32 package set.
 *
 * Contributed by Keith Marshall <[e-mail]>
 *
 *
 * THIS SOFTWARE IS NOT COPYRIGHTED
 *
 * This source code is offered for use in the public domain. You may
 * use, modify or distribute it freely.
 *
 * This code is distributed in the hope that it will be useful but
 * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
 * DISCLAIMED. This includes but is not limited to warranties of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * $Revision: 1.3 $
 * $Author: keithmarshall $
 * $Date: 2008/08/31 22:27:58 $
 *
 */
#define __GETOPT_H__

/* All the headers include this file. */
#include <_mingw.h>

#ifdef __cplusplus
extern "C" {
#endif

extern int optind;		/* index of first non-option in argv      */
extern int optopt;		/* single option character, as parsed     */
extern int opterr;		/* flag to enable built-in diagnostics... */
				/* (user may set to zero, to suppress)    */

extern char *optarg;		/* pointer to argument of current option  */

extern int getopt( int, char * const [], const char * );

#ifdef __cplusplus
}
#endif
/*
 * POSIX requires the `getopt' API to be specified in `unistd.h';
 * thus, `unistd.h' includes this header.  However, we do not want
 * to expose the `getopt_long' or `getopt_long_only' APIs, when
 * included in this manner.  Thus, close the standard __GETOPT_H__
 * declarations block, and open an additional __GETOPT_LONG_H__
 * specific block, only when *not* __UNISTD_H_SOURCED__, in which
 * to declare the extended API.
 */
#endif /* !defined(__GETOPT_H__) */
#if !defined(__UNISTD_H_SOURCED__) && !defined(__GETOPT_LONG_H__)
#define __GETOPT_LONG_H__

#ifdef __cplusplus
extern "C" {
#endif

struct option		/* specification for a long form option...	*/
{
  const char *name;		/* option name, without leading hyphens */
  int         has_arg;		/* does it take an argument?		*/
  int        *flag;		/* where to save its status, or NULL	*/
  int         val;		/* its associated status value		*/
};

enum    		/* permitted values for its `has_arg' field...	*/
{
  no_argument = 0,      	/* option never takes an argument	*/
  required_argument,		/* option always requires an argument	*/
  optional_argument		/* option may take an argument		*/
};

extern int getopt_long( int, char * const [], const char *, const struct option *, int * );
extern int getopt_long_only( int, char * const [], const char *, const struct option *, int * );
/*
 * Previous MinGW implementation had...
 */
#ifndef HAVE_DECL_GETOPT
/*
 * ...for the long form API only; keep this for compatibility.
 */
# define HAVE_DECL_GETOPT	1
#endif

#ifdef __cplusplus
}
#endif

#endif /* !defined(__UNISTD_H_SOURCED__) && !defined(__GETOPT_LONG_H__) */
/* $RCSfile: getopt.h,v $Revision: 1.3 $: end of file */