/*-
 * Public Domain 2014-present MongoDB, Inc.
 * Public Domain 2008-2014 WiredTiger, Inc.
 *
 * This is free and unencumbered software released into the public domain.
 *
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 *
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $	*/

/*
 * 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.
 * 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 "wt_internal.h"

extern int __wt_opterr WT_ATTRIBUTE_LIBRARY_VISIBLE;
extern int __wt_optind WT_ATTRIBUTE_LIBRARY_VISIBLE;
extern int __wt_optopt WT_ATTRIBUTE_LIBRARY_VISIBLE;
extern int __wt_optreset WT_ATTRIBUTE_LIBRARY_VISIBLE;
extern int __wt_optwt WT_ATTRIBUTE_LIBRARY_VISIBLE;

int __wt_opterr = 1, /* if error message should be printed */
  __wt_optind = 1,   /* index into parent argv vector */
  __wt_optopt,       /* character checked for validity */
  __wt_optreset,     /* reset getopt */
  __wt_optwt = 0;    /* enable WT-specific behavior, e.g., using WT_* return codes */

extern char *__wt_optarg WT_ATTRIBUTE_LIBRARY_VISIBLE;
char *__wt_optarg; /* argument associated with option */

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

/*
 * __wt_getopt --
 *     Parse argc/argv argument vector.
 */
int
__wt_getopt(const char *progname, int nargc, char *const *nargv, const char *ostr)
  WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
    static const char *place = EMSG; /* option letter processing */
    const char *oli;                 /* option letter list index */

    if (__wt_optreset || *place == 0) { /* update scanning pointer */
        __wt_optreset = 0;
        place = nargv[__wt_optind];
        if (__wt_optind >= nargc || *place++ != '-') {
            /* Argument is absent or is not an option */
            place = EMSG;
            return (-1);
        }
        __wt_optopt = *place++;
        if (__wt_optopt == '-' && *place == 0) {
            /* "--" => end of options */
            ++__wt_optind;
            place = EMSG;
            return (-1);
        }
        if (__wt_optopt == 0) {
            /* Solitary '-', treat as a '-' option
               if the program (eg su) is looking for it. */
            place = EMSG;
            if (strchr(ostr, '-') == NULL)
                return (-1);
            __wt_optopt = '-';
        }
    } else
        __wt_optopt = *place++;

    /* See if option letter is one the caller wanted... */
    if (__wt_optopt == ':' || (oli = strchr(ostr, __wt_optopt)) == NULL) {
        if (*place == 0)
            ++__wt_optind;
        if (__wt_opterr && *ostr != ':')
            (void)fprintf(stderr, "%s: illegal option -- %c\n", progname, __wt_optopt);
        return (__wt_optwt ? WT_GETOPT_BAD_OPTION : BADCH);
    }

    /* Does this option need an argument? */
    if (oli[1] != ':') {
        /* don't need argument */
        __wt_optarg = NULL;
        if (*place == 0)
            ++__wt_optind;
    } else {
        /* Option-argument is either the rest of this argument or the
           entire next argument. */
        if (*place)
            __wt_optarg = (char *)place;
        else if (nargc > ++__wt_optind)
            __wt_optarg = nargv[__wt_optind];
        else {
            /* option-argument absent */
            place = EMSG;
            if (*ostr == ':')
                return (__wt_optwt ? WT_GETOPT_BAD_ARGUMENT : BADARG);
            if (__wt_opterr)
                (void)fprintf(
                  stderr, "%s: option requires an argument -- %c\n", progname, __wt_optopt);
            return (__wt_optwt ? WT_GETOPT_BAD_OPTION : BADCH);
        }
        place = EMSG;
        ++__wt_optind;
    }
    return (__wt_optopt); /* return option letter */
}