/* getopt.c provide access to the C getopt library.

Copyright (C) 2017-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option)
any later version.

GNU Modula-2 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include <getopt.h>
// #include "ansi-decl.h"


#ifdef __cplusplus
extern "C" {
#endif


char *cgetopt_optarg;
int cgetopt_optind;
int cgetopt_opterr;
int cgetopt_optopt;


char
cgetopt_getopt (int argc, char *argv[], char *optstring)
{
  char r = getopt (argc, argv, optstring);

  cgetopt_optarg = optarg;
  cgetopt_optind = optind;
  cgetopt_opterr = opterr;
  cgetopt_optopt = optopt;

  if (r == (char)-1)
    return (char)0;
  return r;
}


int
cgetopt_cgetopt_long (int argc, char *argv[], char *optstring, const struct option *longopts,
                    int *longindex)
{
  int r = getopt_long (argc, argv, optstring, longopts, longindex);

  cgetopt_optarg = optarg;
  cgetopt_optind = optind;
  cgetopt_opterr = opterr;
  cgetopt_optopt = optopt;

  return r;
}


int
cgetopt_cgetopt_long_only (int argc, char *argv[], char *optstring,
                         const struct option *longopts, int *longindex)
{
  int r = getopt_long_only (argc, argv, optstring, longopts, longindex);

  cgetopt_optarg = optarg;
  cgetopt_optind = optind;
  cgetopt_opterr = opterr;
  cgetopt_optopt = optopt;

  return r;
}


typedef struct cgetopt_Options_s {
  struct option *cinfo;
  unsigned int high;
} cgetopt_Options;


/* InitOptions a constructor for Options.  */

cgetopt_Options *
cgetopt_InitOptions (void)
{
  cgetopt_Options *o = (cgetopt_Options *) malloc (sizeof (cgetopt_Options));
  o->cinfo = (struct option *) malloc (sizeof (struct option));
  o->high = 0;
  return o;
}


/* KillOptions a deconstructor for Options.  Returns NULL after freeing
   up all allocated memory associated with o.  */

cgetopt_Options *
cgetopt_KillOptions (cgetopt_Options *o)
{
  free (o->cinfo);
  free (o);
  return NULL;
}


/* SetOption set option[index] with {name, has_arg, flag, val}.  */

void
cgetopt_SetOption (cgetopt_Options *o, unsigned int index,
		  char *name, bool has_arg,
		  int *flag, int val)
{
  if (index > o->high)
    {
      o->cinfo = (struct option *) malloc (sizeof (struct option) * (index + 1));
      o->high = index + 1;
    }
  o->cinfo[index].name = name;
  o->cinfo[index].has_arg = has_arg;
  o->cinfo[index].flag = flag;
  o->cinfo[index].val = val;
}


/* GetLongOptionArray returns a pointer to the C array containing all
   long options.  */

struct option *
cgetopt_GetLongOptionArray (cgetopt_Options *o)
{
  return o->cinfo;
}


/* GNU Modula-2 linking fodder.  */

void
_M2_cgetopt_init (void)
{
}


void
_M2_cgetopt_finish (void)
{
}

#   ifdef __cplusplus
}
#   endif