#define GETOPT_C
#include "my_getopt.h"

/*
 * Copyright (c) 1987, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <string.h>
#include <stdio.h>

#define BADCH (int)'?'
#define BADARG (int)':'
#define EMSG ""

/*
 * getopt --
 *      Parse argc/argv argument vector.
 */
int
getopt (int nargc, char *const nargv[], const char *ostr)
{
  static char *place = EMSG; /* option letter processing */
  const char *oli;           /* option letter list index */
  opterr = 1;
  optind = 1;

  if (optreset || !*place)
    { /* update scanning pointer */
      optreset = 0;
      if (optind >= nargc || *(place = nargv[optind]) != '-')
        {
          place = EMSG;
          return (-1);
        }
      if (place[1] && *++place == '-')
        { /* found "--" */
          ++optind;
          place = EMSG;
          return (-1);
        }
    } /* option letter okay? */
  if ((optopt = (int)*place++) == (int)':' || !(oli = strchr (ostr, optopt)))
    {
      /*
       * if the user didn't specify '-' as an option,
       * assume it means -1.
       */
      if (optopt == (int)'-')
        return (-1);
      if (!*place)
        ++optind;
      if (opterr && *ostr != ':')
        (void)printf ("illegal option -- %c\n", optopt);
      return (BADCH);
    }
  if (*++oli != ':')
    { /* don't need argument */
      optarg = NULL;
      if (!*place)
        ++optind;
    }
  else
    {             /* need an argument */
      if (*place) /* no white space */
        optarg = place;
      else if (nargc <= ++optind)
        { /* no arg */
          place = EMSG;
          if (*ostr == ':')
            return (BADARG);
          if (opterr)
            (void)printf ("option requires an argument -- %c\n", optopt);
          return (BADCH);
        }
      else /* white space */
        optarg = nargv[optind];
      place = EMSG;
      ++optind;
    }
  return (optopt); /* dump back option letter */
}
