getopt.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 */
/*
 * 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. 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.
 *
 * $Id: getopt.c,v 12.1 2005/06/16 20:20:48 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif

#include "db_int.h"

int     __db_getopt_reset;      /* global reset for VxWorks. */

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 */

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

/*
 * getopt --
 *      Parse argc/argv argument vector.
 *
 * PUBLIC: #ifndef HAVE_GETOPT
 * PUBLIC: int getopt __P((int, char * const *, const char *));
 * PUBLIC: #endif
 */
int
getopt(nargc, nargv, ostr)
        int nargc;
        char * const *nargv;
        const char *ostr;
{
        static char *progname;
        static char *place = EMSG;              /* option letter processing */
        char *oli;                              /* option letter list index */

        /*
         * VxWorks needs to be able to repeatedly call getopt from multiple
         * programs within its global name space.
         */
        if (__db_getopt_reset) {
                __db_getopt_reset = 0;

                opterr = optind = 1;
                optopt = optreset = 0;
                optarg = NULL;
                progname = NULL;
                place = EMSG;
        }
        if (!progname) {
                if ((progname = __db_rpath(*nargv)) == NULL)
                        progname = *nargv;
                else
                        ++progname;
        }

        if (optreset || !*place) {              /* update scanning pointer */
                optreset = 0;
                if (optind >= nargc || *(place = nargv[optind]) != '-') {
                        place = EMSG;
                        return (EOF);
                }
                if (place[1] && *++place == '-') {      /* found "--" */
                        ++optind;
                        place = EMSG;
                        return (EOF);
                }
        }                                       /* option letter okay? */
        if ((optopt = (int)*place++) == (int)':' ||
            !(oli = strchr(ostr, optopt))) {
                /*
                 * if the user didn't specify '-' as an option,
                 * assume it means EOF.
                 */
                if (optopt == (int)'-')
                        return (EOF);
                if (!*place)
                        ++optind;
                if (opterr && *ostr != ':')
                        (void)fprintf(stderr,
                            "%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(stderr,
                                    "%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 */
}

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