getopt.c

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/*  $NetBSD: getopt.c,v 1.27 2005/11/29 03:12:00 christos 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.
 * 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.
 */
 
#undef LIBC_SCCS
 
#if !defined(_WIN32)
# include <sys/cdefs.h>
#else
# define __UNCONST(x) ((char*)(x))
# define getprogname() (nargv[0])
# define _DIAGASSERT(x) assert((x))
#endif
 
#if !defined(_WIN32)  &&  0
# include "namespace.h"
#endif
 
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if !defined(_WIN32)
# include <unistd.h>
#endif
 
#include <freetds/sysdep_private.h>
 
#ifdef __weak_alias
__weak_alias(getopt,_getopt)
#endif
 
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
tds_getopt(nargc, nargv, ostr)
    int nargc;
    char * const nargv[];
    const char *ostr;
{
    static const char *place = EMSG;    /* option letter processing */
    char *oli;              /* option letter list index */
 
    _DIAGASSERT(nargv != NULL);
    _DIAGASSERT(ostr != NULL);
 
    if (optreset || *place == 0) {      /* update scanning pointer */
        optreset = 0;
        place = nargv[optind];
        if (optind >= nargc || *place++ != '-') {
            /* Argument is absent or is not an option */
            place = EMSG;
            return (-1);
        }
        optopt = *place++;
        if (optopt == '-' && *place == 0) {
            /* "--" => end of options */
            ++optind;
            place = EMSG;
            return (-1);
        }
        if (optopt == 0) {
            /* Solitary '-', treat as a '-' option
               if the program (eg su) is looking for it. */
            place = EMSG;
            if (strchr(ostr, '-') == NULL)
                return -1;
            optopt = '-';
        }
    } else
        optopt = *place++;
 
    /* See if option letter is one the caller wanted... */
    if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
        if (*place == 0)
            ++optind;
        if (opterr && *ostr != ':')
            (void)fprintf(stderr,
                "%s: unknown option -- %c\n", getprogname(),
                optopt);
        return (BADCH);
    }
 
    /* Does this option need an argument? */
    if (oli[1] != ':') {
        /* don't need argument */
        optarg = NULL;
        if (*place == 0)
            ++optind;
    } else {
        /* Option-argument is either the rest of this argument or the
           entire next argument. */
        if (*place)
            optarg = __UNCONST(place);
        else if (nargc > ++optind)
            optarg = nargv[optind];
        else {
            /* option-argument absent */
            place = EMSG;
            if (*ostr == ':')
                return (BADARG);
            if (opterr)
                (void)fprintf(stderr,
                    "%s: option requires an argument -- %c\n",
                    getprogname(), optopt);
            return (BADCH);
        }
        place = EMSG;
        ++optind;
    }
    return (optopt);            /* return option letter */
}