bsd-getopt_long.c

功能强大的ftp服务器源代码

/*	$OpenBSD: getopt_long.c,v 1.13 2003/06/03 01:52:40 millert Exp $	*/
/*	$NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $	*/

/*
 * Copyright (c) 2002 Todd C. Miller <[e-mail]>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * 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 NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#define IN_GETOPT_LONG_C 1

#include <config.h>
#include "ftpd.h"

#ifndef HAVE_GETOPT_LONG

# include "bsd-getopt_long.h"

# ifdef WITH_DMALLOC
#  include <dmalloc.h>
# endif

int	pure_opterr = 1;		/* if error message should be printed */
int	pure_optind = 1;		/* index into parent argv vector */
int	pure_optopt = '?';		/* character checked for validity */
int	pure_optreset;		/* reset getopt */
const char    *pure_optarg;		/* argument associated with option */

# define PRINT_ERROR	((pure_opterr) && (*options != ':'))

# define FLAG_PERMUTE	0x01	/* permute non-options to the end of argv */
# define FLAG_ALLARGS	0x02	/* treat non-options as args to option "-1" */
# define FLAG_LONGONLY	0x04	/* operate as pure_pure_getopt_long_only */

/* return values */
# define	BADCH		(int)'?'
# define	BADARG		((*options == ':') ? (int)':' : (int)'?')
# define	INORDER 	(int)1

# define	EMSG		""

static int pure_getopt_internal(int, char * const *, const char *,
                                const struct pure_option *, int *, int);
static int pure_parse_long_options(char * const *, const char *,
                                   const struct pure_option *, int *, int);
static int pure_gcd(int, int);
static void pure_permute_args(int, int, int, char * const *);

static const char *pure_place = EMSG; /* option letter processing */

/* XXX: set pure_optreset to 1 rather than these two */
static int nonopt_start = -1; /* first non option argument (for permute) */
static int nonopt_end = -1;   /* first option after non options (for permute) */

/* Error messages */
static const char *recargchar = "option requires an argument -- %c";
static const char *recargstring = "option requires an argument -- %s";
static const char *ambig = "ambiguous option -- %.*s";
static const char *noarg = "option doesn't take an argument -- %.*s";
static const char *illoptchar = "unknown option -- %c";
static const char *illoptstring = "unknown option -- %s";

/*
 * Compute the greatest common divisor of a and b.
 */
static int pure_gcd(int a, int b)
{
    int c;
    
    c = a % b;
    while (c != 0) {
        a = b;
        b = c;
        c = a % b;
    }    
    return b;
}

/*
 * Exchange the block from nonopt_start to nonopt_end with the block
 * from nonopt_end to opt_end (keeping the same order of arguments
 * in each block).
 */
static void pure_permute_args(int panonopt_start, int panonopt_end, 
                              int opt_end, char * const *nargv)
{
    int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
    char *swap;
    
    /*
     * compute lengths of blocks and number and size of cycles
     */
    nnonopts = panonopt_end - panonopt_start;
    nopts = opt_end - panonopt_end;
    ncycle = pure_gcd(nnonopts, nopts);
    cyclelen = (opt_end - panonopt_start) / ncycle;
    
    for (i = 0; i < ncycle; i++) {
        cstart = panonopt_end+i;
        pos = cstart;
        for (j = 0; j < cyclelen; j++) {
            if (pos >= panonopt_end)
                pos -= nnonopts;
            else
                pos += nopts;
            swap = nargv[pos];
            /* LINTED const cast */
            ((char **) nargv)[pos] = nargv[cstart];
            /* LINTED const cast */
            ((char **)nargv)[cstart] = swap;
        }
    }
}

/*
 * pure_parse_long_options --
 *	Parse long options in argc/argv argument vector.
 * Returns -1 if short_too is set and the option does not match long_options.
 */
static int pure_parse_long_options(char * const *nargv, const char *options,
                                   const struct pure_option *long_options,
                                   int *idx, int short_too)
{
    const char *current_argv, *has_equal;
    size_t current_argv_len;
    int i, match;
    
    current_argv = pure_place;
    match = -1;
    
    pure_optind++;
    
    if ((has_equal = strchr(current_argv, '=')) != NULL) {
        /* argument found (--option=arg) */
        current_argv_len = has_equal - current_argv;
        has_equal++;
    } else
        current_argv_len = strlen(current_argv);
    
    for (i = 0; long_options[i].name; i++) {
        /* find matching long option */
        if (strncmp(current_argv, long_options[i].name,
		    current_argv_len))
            continue;
        
        if (strlen(long_options[i].name) == current_argv_len) {
            /* exact match */
            match = i;
            break;
        }
        /*
         * If this is a known short option, don't allow
         * a partial match of a single character.
         */
        if (short_too && current_argv_len == 1)
            continue;
        
        if (match == -1)	/* partial match */
            match = i;
        else {
            /* ambiguous abbreviation */
            if (PRINT_ERROR)
                fprintf(stderr, ambig, (int)current_argv_len,
                        current_argv);
            pure_optopt = 0;
            return BADCH;
        }
    }
    if (match != -1) {		/* option found */
        if (long_options[match].has_arg == no_argument
            && has_equal) {
            if (PRINT_ERROR)
                fprintf(stderr, noarg, (int)current_argv_len,
                        current_argv);
            /*
             * XXX: GNU sets pure_optopt to val regardless of flag
             */
            if (long_options[match].flag == NULL)
                pure_optopt = long_options[match].val;
            else
                pure_optopt = 0;
            return BADARG;
        }
        if (long_options[match].has_arg == required_argument ||
            long_options[match].has_arg == optional_argument) {
            if (has_equal)
                pure_optarg = has_equal;
            else if (long_options[match].has_arg ==
                     required_argument) {
                /*
                 * optional argument doesn't use next nargv
                 */
                pure_optarg = nargv[pure_optind++];
            }
        }
        if ((long_options[match].has_arg == required_argument)
            && (pure_optarg == NULL)) {
            /*
             * Missing argument; leading ':' indicates no error
             * should be generated.
             */
            if (PRINT_ERROR)
                fprintf(stderr, recargstring,
                        current_argv);
            /*
             * XXX: GNU sets pure_optopt to val regardless of flag
             */
            if (long_options[match].flag == NULL)
                pure_optopt = long_options[match].val;
            else
                pure_optopt = 0;
            --pure_optind;
            return BADARG;
        }
    } else {			/* unknown option */