mingw-w64-headers/include/getopt.h

#ifndef __GETOPT_H__
/**
 * DISCLAIMER
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is a part of the w64 mingw-runtime package.
 *
 * The w64 mingw-runtime package and its code is distributed in the hope that it 
 * will be useful but WITHOUT ANY WARRANTY.  ALL WARRANTIES, EXPRESSED OR 
 * IMPLIED ARE HEREBY DISCLAIMED.  This includes but is not limited to 
 * warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

#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 nargc, char * const *nargv, const char *options);

#ifdef _BSD_SOURCE
/*
 * BSD adds the non-standard `optreset' feature, for reinitialisation
 * of `getopt' parsing.  We support this feature, for applications which
 * proclaim their BSD heritage, before including this header; however,
 * to maintain portability, developers are advised to avoid it.
 */
# define optreset  __mingw_optreset
extern int optreset;
#endif
#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 nargc, char * const *nargv, const char *options,
    const struct option *long_options, int *idx);
extern int getopt_long_only(int nargc, char * const *nargv, const char *options,
    const struct option *long_options, int *idx);
/*
 * 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__) */