getopt.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996,2008 Oracle.  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 12.8 2008/03/12 17:50:25 mbrey Exp $
 */

// #include "db_config.h"

// #include "db_int.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ios_error.h"

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

// Not __thread unless I rename them. 
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. And so does iOS.
     */
    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(thread_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(thread_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 */
}