/*      $NetBSD: main.c,v 1.3 2014/01/22 06:17:25 riastradh Exp $       */

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* 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.
*
* 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.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: main.c,v 1.3 2014/01/22 06:17:25 riastradh Exp $");

#include <assert.h>
#include <err.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"

static int (*operation)(int, char **, const struct options *) = &vndcompress;

int
main(int argc, char **argv)
{
       static const struct options zero_options;
       struct options options = zero_options, *O = &options;
       int ch;

       setprogname(argv[0]);

       if (strcmp(getprogname(), "vndcompress") == 0)
               operation = &vndcompress;
       else if (strcmp(getprogname(), "vnduncompress") == 0)
               operation = &vnduncompress;
       else
               warnx("unknown program name, defaulting to vndcompress: %s",
                   getprogname());

       while ((ch = getopt(argc, argv, "b:cdk:l:p:rRw:")) != -1) {
               switch (ch) {
               case 'b':
                       if (ISSET(O->flags, FLAG_b)) {
                               warnx("-b may be supplied only once");
                               usage();
                       }
                       O->flags |= FLAG_b;
                       __CTASSERT(MIN_BLOCKSIZE <= MAX_BLOCKSIZE);
                       __CTASSERT(MAX_BLOCKSIZE <= LLONG_MAX);
                       O->blocksize = strsuftoll("block size", optarg,
                           MIN_BLOCKSIZE, MAX_BLOCKSIZE);
                       break;

               case 'c':
                       if (ISSET(O->flags, FLAG_d)) {
                               warnx("-c and -d are mutually exclusive");
                               usage();
                       }
                       O->flags |= FLAG_c;
                       operation = &vndcompress;
                       break;

               case 'd':
                       if (ISSET(O->flags, FLAG_c)) {
                               warnx("-c and -d are mutually exclusive");
                               usage();
                       }
                       O->flags |= FLAG_d;
                       operation = &vnduncompress;
                       break;

               case 'k':
                       if (ISSET(O->flags, FLAG_k)) {
                               warnx("-k may be supplied only once");
                               usage();
                       }
                       O->flags |= FLAG_k;
                       O->checkpoint_blocks = strsuftoll("checkpoint blocks",
                           optarg,
                           0, MIN(UINT32_MAX, (OFF_MAX / MIN_BLOCKSIZE)));
                       break;

               case 'l':
                       if (ISSET(O->flags, FLAG_l)) {
                               warnx("-l may be supplied only once");
                               usage();
                       }
                       O->flags |= FLAG_l;
                       O->length = strsuftoll("length", optarg,
                           0, MIN(OFF_MAX, UINT64_MAX));
                       break;

               case 'p':
                       O->flags |= FLAG_p;
                       __CTASSERT(OFF_MAX <= LLONG_MAX);
                       O->end_block = strsuftoll("end block", optarg,
                           0, MIN(UINT32_MAX, (OFF_MAX / MIN_BLOCKSIZE)));
                       break;

               case 'r':
                       O->flags |= FLAG_r;
                       break;

               case 'R':
                       O->flags |= FLAG_R;
                       break;

               case 'w':
                       if (ISSET(O->flags, FLAG_w)) {
                               warnx("-w may be supplied only once");
                               usage();
                       }
                       O->flags |= FLAG_w;
                       O->window_size = strsuftoll("window size", optarg,
                           0, MAX_WINDOW_SIZE);
                       break;

               case '?':
               default:
                       usage();
               }
       }

       argc -= optind;
       argv += optind;

       if (operation == &vnduncompress) {
               if (ISSET(O->flags, ~(FLAG_d | FLAG_w)))
                       usage();
       } else {
               assert(operation == &vndcompress);
               if (ISSET(O->flags, ~(FLAG_b | FLAG_c | FLAG_k | FLAG_l |
                           FLAG_p | FLAG_r | FLAG_R | FLAG_w)))
                       usage();
               if (ISSET(O->flags, FLAG_R) && !ISSET(O->flags, FLAG_r)) {
                       warnx("-R makes no sense without -r");
                       usage();
               }
       }

       return (*operation)(argc, argv, O);
}

void __dead
usage(void)
{

       (void)fprintf(stderr,
           "Usage: %s -c [-rR] [-b <blocksize>] [-k <checkpoint-blocks>]\n"
           "          [-l <length>] [-p <partial-offset>] [-w <winsize>]\n"
           "          <image> <compressed-image> [<blocksize>]\n"
           "       %s -d <compressed-image> <image>\n",
           getprogname(), getprogname());
       exit(1);
}

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