source: mainline/uspace/app/bdsh/cmds/modules/bdd/bdd.c@ cffce57

/*
 * 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 <string.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>

#define BLOCK_SIZE      512
#define 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;
        dev_handle_t handle;
        block_t *block;
        uint8_t *blk;
        size_t size, bytes, rows;
        int rc;
        bn_t boff;
        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)
                boff = strtol(argv[2], NULL, 0);
        else
                boff = 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("Error: could not resolve device `%s'.\n", argv[1]);
                return CMD_FAILURE;
        }

        rc = block_init(handle, BLOCK_SIZE);
        if (rc != EOK)  {
                printf("Error: could not init libblock.\n");
                return CMD_FAILURE;
        }

        rc = block_cache_init(handle, BLOCK_SIZE, 2, CACHE_MODE_WB);
        if (rc != EOK) {
                printf("Error: could not init block cache.\n");
                return CMD_FAILURE;
        }

        while (size > 0) {
                rc = block_get(&block, handle, boff, 0);
                if (rc != EOK) {
                        printf("Error: could not get block %u, device %u.\n",
                            boff, handle);
                        return CMD_FAILURE;
                }
                blk = (uint8_t *) block->data;

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

                for (j = 0; j < rows; j++) {
                        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(' ');
                                }
                        }
                        putchar('\n');
                }

                rc = block_put(block);
                if (rc != EOK) {
                        printf("Error: could not put block %p.\n",
                            block);
                        return CMD_FAILURE;
                }

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

                boff += rows * BPR;
        }

        block_fini(handle);

        return CMD_SUCCESS;
}