/*
 * 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.
 */

/* last review : october 29th, 2002 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
#endif              /* LIBC_SCCS and not lint */

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

int opterr = 1,         /* if error message should be printed */
    optind = 1,            /* index into parent argv vector */
    optopt,                /* character checked for validity */
    optreset;              /* reset getopt */
char *optarg;           /* argument associated with option */

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

/*
 * getopt --
 *  Parse argc/argv argument vector.
 */
int getopt(int nargc, char *const *nargv, const char *ostr)
{

#  define __progname nargv[0] /* program name */

    static char *place = EMSG;    /* option letter processing */
    char *oli;                    /* option letter list index */

    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) fprintf(stdout, "[ERROR] %s: illegal option -- %c\n", __progname,
                           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) fprintf(stdout, "[ERROR] %s: option requires an argument -- %c\n",
                               __progname, optopt);
            }
            return (BADCH);
        } else {                        /* white space */
            optarg = nargv[optind];
        }
        place = EMSG;
        ++optind;
    }
    return (optopt);      /* dump back option letter */
}
