getopt.h

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// SPDX-License-Identifier: BSD-2-Clause
//this comes from https://github.com/skandhurkat/Getopt-for-Visual-Studio/blob/master/getopt.h
#ifndef __GETOPT_H__
#define __GETOPT_H__
 
 /* All the headers include this file. */
#include <crtdefs.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__) */