bdd.c

/*
 * Copyright (c) 2009 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <sys/typefmt.h>
#include "config.h"
#include "util.h"
#include "errors.h"
#include "entry.h"
#include "bdd.h"
#include "cmds.h"

#include <libblock.h>
#include <devmap.h>
#include <errno.h>
#include <assert.h>

enum {
        /* Number of bytes per row */
        BPR = 16
};

static const char *cmdname = "bdd";

/* Dispays help for bdd in various levels */
void help_cmd_bdd(unsigned int level)
{
        static char helpfmt[] =
            "Usage:  %s <device> [<block_number> [<bytes>]]\n";
        if (level == HELP_SHORT) {
                printf("'%s' dump block device contents.\n", cmdname);
        } else {
                help_cmd_bdd(HELP_SHORT);
                printf(helpfmt, cmdname);
        }
        return;
}

/* Main entry point for bdd, accepts an array of arguments */
int cmd_bdd(char **argv)
{
        unsigned int argc;
        unsigned int i, j;
        devmap_handle_t handle;
        aoff64_t offset;
        uint8_t *blk;
        size_t size, bytes, rows;
        size_t block_size;
        int rc;
        aoff64_t ba;
        uint8_t b;

        /* Count the arguments */
        for (argc = 0; argv[argc] != NULL; argc ++);

        if (argc < 2 || argc > 4) {
                printf("%s - incorrect number of arguments.\n", cmdname);
                return CMD_FAILURE;
        }

        if (argc >= 3)
                ba = strtol(argv[2], NULL, 0);
        else
                ba = 0;

        if (argc >= 4)
                size = strtol(argv[3], NULL, 0);
        else
                size = 256;

        rc = devmap_device_get_handle(argv[1], &handle, 0);
        if (rc != EOK) {
                printf("%s: Error resolving device `%s'.\n", cmdname, argv[1]);
                return CMD_FAILURE;
        }

        rc = block_init(handle, 2048);
        if (rc != EOK)  {
                printf("%s: Error initializing libblock.\n", cmdname);
                return CMD_FAILURE;
        }

        rc = block_get_bsize(handle, &block_size);
        if (rc != EOK) {
                printf("%s: Error determining device block size.\n", cmdname);
                return CMD_FAILURE;
        }

        blk = malloc(block_size);
        if (blk == NULL) {
                printf("%s: Error allocating memory.\n", cmdname);
                block_fini(handle);
                return CMD_FAILURE;
        }

        offset = ba * block_size;

        while (size > 0) {
                rc = block_read_direct(handle, ba, 1, blk);
                if (rc != EOK) {
                        printf("%s: Error reading block %" PRIuOFF64 "\n", cmdname, ba);
                        free(blk);
                        block_fini(handle);
                        return CMD_FAILURE;
                }

                bytes = (size < block_size) ? size : block_size;
                rows = (bytes + BPR - 1) / BPR;

                for (j = 0; j < rows; j++) {
                        printf("[%06" PRIxOFF64 "] ", offset);
                        for (i = 0; i < BPR; i++) {
                                if (j * BPR + i < bytes)
                                        printf("%02x ", blk[j * BPR + i]);
                                else
                                        printf("   ");
                        }
                        putchar('\t');

                        for (i = 0; i < BPR; i++) {
                                if (j * BPR + i < bytes) {
                                        b = blk[j * BPR + i];
                                        if (b >= 32 && b < 127)
                                                putchar(b);
                                        else
                                                putchar(' ');
                                } else {
                                        putchar(' ');
                                }
                        }
                        offset += BPR;
                        putchar('\n');
                }

                if (size > rows * BPR)
                        size -= rows * BPR;
                else
                        size = 0;

                /* Next block */
                ba += 1;
        }

        free(blk);
        block_fini(handle);

        return CMD_SUCCESS;
}

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