debugfs/logdump.c

   1 /*
   2  * logdump.c --- dump the contents of the journal out to a file
   3  *
   4  * Authro: Stephen C. Tweedie, 2001  <sct@redhat.com>
   5  * Copyright (C) 2001 Red Hat, Inc.
   6  * Based on portions  Copyright (C) 1994 Theodore Ts'o.
   7  *
   8  * This file may be redistributed under the terms of the GNU Public
   9  * License.
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <stdlib.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <time.h>
  19 #ifdef HAVE_ERRNO_H
  20 #include <errno.h>
  21 #endif
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <utime.h>
  26 #ifdef HAVE_GETOPT_H
  27 #include <getopt.h>
  28 #else
  29 extern int optind;
  30 extern char *optarg;
  31 #endif
  32
  33 #include "debugfs.h"
  34 #include "blkid/blkid.h"
  35 #include "jfs_user.h"
  36 #include <uuid/uuid.h>
  37
  38 enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
  39
  40 #define ANY_BLOCK ((blk64_t) -1)
  41
  42 static int              dump_all, dump_contents, dump_descriptors;
  43 static blk64_t          block_to_dump, bitmap_to_dump, inode_block_to_dump;
  44 static unsigned int     group_to_dump, inode_offset_to_dump;
  45 static ext2_ino_t       inode_to_dump;
  46
  47 struct journal_source
  48 {
  49         enum journal_location where;
  50         int fd;
  51         ext2_file_t file;
  52 };
  53
  54 static void dump_journal(char *, FILE *, struct journal_source *);
  55
  56 static void dump_descriptor_block(FILE *, struct journal_source *,
  57                                   char *, journal_superblock_t *,
  58                                   unsigned int *, int, tid_t);
  59
  60 static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
  61                                   unsigned int, int, tid_t);
  62
  63 static void dump_metadata_block(FILE *, struct journal_source *,
  64                                 journal_superblock_t*,
  65                                 unsigned int, unsigned int, unsigned int,
  66                                 int, tid_t);
  67
  68 static void do_hexdump (FILE *, char *, int);
  69
  70 #define WRAP(jsb, blocknr)                                      \
  71         if (blocknr >= be32_to_cpu((jsb)->s_maxlen))            \
  72                 blocknr -= (be32_to_cpu((jsb)->s_maxlen) -      \
  73                             be32_to_cpu((jsb)->s_first));
  74
  75 void do_logdump(int argc, char **argv)
  76 {
  77         int             c;
  78         int             retval;
  79         char            *out_fn;
  80         FILE            *out_file;
  81
  82         char            *inode_spec = NULL;
  83         char            *journal_fn = NULL;
  84         int             journal_fd = 0;
  85         int             use_sb = 0;
  86         ext2_ino_t      journal_inum;
  87         struct ext2_inode journal_inode;
  88         ext2_file_t     journal_file;
  89         char            *tmp;
  90         struct journal_source journal_source;
  91         struct ext2_super_block *es = NULL;
  92
  93         journal_source.where = JOURNAL_IS_INTERNAL;
  94         journal_source.fd = 0;
  95         journal_source.file = 0;
  96         dump_all = 0;
  97         dump_contents = 0;
  98         dump_descriptors = 1;
  99         block_to_dump = ANY_BLOCK;
 100         bitmap_to_dump = -1;
 101         inode_block_to_dump = ANY_BLOCK;
 102         inode_to_dump = -1;
 103
 104         reset_getopt();
 105         while ((c = getopt (argc, argv, "ab:ci:f:s")) != EOF) {
 106                 switch (c) {
 107                 case 'a':
 108                         dump_all++;
 109                         break;
 110                 case 'b':
 111                         block_to_dump = strtoul(optarg, &tmp, 0);
 112                         if (*tmp) {
 113                                 com_err(argv[0], 0,
 114                                         "Bad block number - %s", optarg);
 115                                 return;
 116                         }
 117                         dump_descriptors = 0;
 118                         break;
 119                 case 'c':
 120                         dump_contents++;
 121                         break;
 122                 case 'f':
 123                         journal_fn = optarg;
 124                         break;
 125                 case 'i':
 126                         inode_spec = optarg;
 127                         dump_descriptors = 0;
 128                         break;
 129                 case 's':
 130                         use_sb++;
 131                         break;
 132                 default:
 133                         goto print_usage;
 134                 }
 135         }
 136         if (optind != argc && optind != argc-1) {
 137                 goto print_usage;
 138         }
 139
 140         if (current_fs)
 141                 es = current_fs->super;
 142
 143         if (inode_spec) {
 144                 int inode_group, group_offset, inodes_per_block;
 145
 146                 if (check_fs_open(argv[0]))
 147                         return;
 148
 149                 inode_to_dump = string_to_inode(inode_spec);
 150                 if (!inode_to_dump)
 151                         return;
 152
 153                 inode_group = ((inode_to_dump - 1)
 154                                / es->s_inodes_per_group);
 155                 group_offset = ((inode_to_dump - 1)
 156                                 % es->s_inodes_per_group);
 157                 inodes_per_block = (current_fs->blocksize
 158                                     / sizeof(struct ext2_inode));
 159
 160                 inode_block_to_dump =
 161                         ext2fs_inode_table_loc(current_fs, inode_group) +
 162                         (group_offset / inodes_per_block);
 163                 inode_offset_to_dump = ((group_offset % inodes_per_block)
 164                                         * sizeof(struct ext2_inode));
 165                 printf("Inode %u is at group %u, block %llu, offset %u\n",
 166                        inode_to_dump, inode_group,
 167                        inode_block_to_dump, inode_offset_to_dump);
 168         }
 169
 170         if (optind == argc) {
 171                 out_file = stdout;
 172         } else {
 173                 out_fn = argv[optind];
 174                 out_file = fopen(out_fn, "w");
 175                 if (!out_file) {
 176                         com_err(argv[0], errno, "while opening %s for logdump",
 177                                 out_fn);
 178                         goto errout;
 179                 }
 180         }
 181
 182         if (block_to_dump != ANY_BLOCK && current_fs != NULL) {
 183                 group_to_dump = ((block_to_dump -
 184                                   es->s_first_data_block)
 185                                  / es->s_blocks_per_group);
 186                 bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
 187         }
 188
 189         if (!journal_fn && check_fs_open(argv[0]))
 190                 goto errout;
 191
 192         if (journal_fn) {
 193                 /* Set up to read journal from a regular file somewhere */
 194                 journal_fd = open(journal_fn, O_RDONLY, 0);
 195                 if (journal_fd < 0) {
 196                         com_err(argv[0], errno, "while opening %s for logdump",
 197                                 journal_fn);
 198                         goto errout;
 199                 }
 200
 201                 journal_source.where = JOURNAL_IS_EXTERNAL;
 202                 journal_source.fd = journal_fd;
 203         } else if ((journal_inum = es->s_journal_inum)) {
 204                 if (use_sb) {
 205                         if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
 206                                 com_err(argv[0], 0,
 207                                         "no journal backup in super block\n");
 208                                 goto errout;
 209                         }
 210                         memset(&journal_inode, 0, sizeof(struct ext2_inode));
 211                         memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
 212                                EXT2_N_BLOCKS*4);
 213                         journal_inode.i_size_high = es->s_jnl_blocks[15];
 214                         journal_inode.i_size = es->s_jnl_blocks[16];
 215                         journal_inode.i_links_count = 1;
 216                         journal_inode.i_mode = LINUX_S_IFREG | 0600;
 217                 } else {
 218                         if (debugfs_read_inode(journal_inum, &journal_inode,
 219                                                argv[0]))
 220                                 goto errout;
 221                 }
 222
 223                 retval = ext2fs_file_open2(current_fs, journal_inum,
 224                                            &journal_inode, 0, &journal_file);
 225                 if (retval) {
 226                         com_err(argv[0], retval, "while opening ext2 file");
 227                         goto errout;
 228                 }
 229                 journal_source.where = JOURNAL_IS_INTERNAL;
 230                 journal_source.file = journal_file;
 231         } else {
 232                 char uuid[37];
 233
 234                 uuid_unparse(es->s_journal_uuid, uuid);
 235                 journal_fn = blkid_get_devname(NULL, "UUID", uuid);
 236                 if (!journal_fn)
 237                                 journal_fn = blkid_devno_to_devname(es->s_journal_dev);
 238                 if (!journal_fn) {
 239                         com_err(argv[0], 0, "filesystem has no journal");
 240                         goto errout;
 241                 }
 242                 journal_fd = open(journal_fn, O_RDONLY, 0);
 243                 if (journal_fd < 0) {
 244                         com_err(argv[0], errno, "while opening %s for logdump",
 245                                 journal_fn);
 246                         free(journal_fn);
 247                         goto errout;
 248                 }
 249                 fprintf(out_file, "Using external journal found at %s\n",
 250                         journal_fn);
 251                 free(journal_fn);
 252                 journal_source.where = JOURNAL_IS_EXTERNAL;
 253                 journal_source.fd = journal_fd;
 254         }
 255
 256         dump_journal(argv[0], out_file, &journal_source);
 257
 258         if (journal_source.where == JOURNAL_IS_INTERNAL)
 259                 ext2fs_file_close(journal_file);
 260         else
 261                 close(journal_fd);
 262
 263 errout:
 264         if (out_file && (out_file != stdout))
 265                 fclose(out_file);
 266
 267         return;
 268
 269 print_usage:
 270         fprintf(stderr, "%s: Usage: logdump [-acs] [-b<block>] [-i<filespec>]\n\t"
 271                 "[-f<journal_file>] [output_file]\n", argv[0]);
 272 }
 273
 274
 275 static int read_journal_block(const char *cmd, struct journal_source *source,
 276                               off_t offset, char *buf, unsigned int size)
 277 {
 278         int retval;
 279         unsigned int got;
 280
 281         if (source->where == JOURNAL_IS_EXTERNAL) {
 282                 if (lseek(source->fd, offset, SEEK_SET) < 0) {
 283                         retval = errno;
 284                         goto seek_err;
 285                 }
 286                 retval = read(source->fd, buf, size);
 287                 if (retval < 0) {
 288                         retval = errno;
 289                         goto read_err;
 290                 }
 291                 got = retval;
 292                 retval = 0;
 293         } else {
 294                 retval = ext2fs_file_lseek(source->file, offset,
 295                                            EXT2_SEEK_SET, NULL);
 296                 if (retval) {
 297                 seek_err:
 298                         com_err(cmd, retval, "while seeking in reading journal");
 299                         return retval;
 300                 }
 301                 retval = ext2fs_file_read(source->file, buf, size, &got);
 302                 if (retval) {
 303                 read_err:
 304                         com_err(cmd, retval, "while reading journal");
 305                         return retval;
 306                 }
 307         }
 308         if (got != size) {
 309                 com_err(cmd, 0, "short read (read %u, expected %u) "
 310                         "while reading journal", got, size);
 311                 retval = -1;
 312         }
 313         return retval;
 314 }
 315
 316 static const char *type_to_name(int btype)
 317 {
 318         switch (btype) {
 319         case JFS_DESCRIPTOR_BLOCK:
 320                 return "descriptor block";
 321         case JFS_COMMIT_BLOCK:
 322                 return "commit block";
 323         case JFS_SUPERBLOCK_V1:
 324                 return "V1 superblock";
 325         case JFS_SUPERBLOCK_V2:
 326                 return "V2 superblock";
 327         case JFS_REVOKE_BLOCK:
 328                 return "revoke table";
 329         }
 330         return "unrecognised type";
 331 }
 332
 333
 334 static void dump_journal(char *cmdname, FILE *out_file,
 335                          struct journal_source *source)
 336 {
 337         struct ext2_super_block *sb;
 338         char                    jsb_buffer[1024];
 339         char                    buf[8192];
 340         journal_superblock_t    *jsb;
 341         unsigned int            blocksize = 1024;
 342         int                     retval;
 343         __u32                   magic, sequence, blocktype;
 344         journal_header_t        *header;
 345
 346         tid_t                   transaction;
 347         unsigned int            blocknr = 0;
 348
 349         /* First, check to see if there's an ext2 superblock header */
 350         retval = read_journal_block(cmdname, source, 0, buf, 2048);
 351         if (retval)
 352                 return;
 353
 354         jsb = (journal_superblock_t *) buf;
 355         sb = (struct ext2_super_block *) (buf+1024);
 356 #ifdef WORDS_BIGENDIAN
 357         if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 358                 ext2fs_swap_super(sb);
 359 #endif
 360
 361         if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
 362             (sb->s_magic == EXT2_SUPER_MAGIC) &&
 363             (sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 364                 blocksize = EXT2_BLOCK_SIZE(sb);
 365                 blocknr = (blocksize == 1024) ? 2 : 1;
 366                 uuid_unparse(sb->s_uuid, jsb_buffer);
 367                 fprintf(out_file, "Ext2 superblock header found.\n");
 368                 if (dump_all) {
 369                         fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
 370                         fprintf(out_file, "\tblocksize=%d\n", blocksize);
 371                         fprintf(out_file, "\tjournal data size %lu\n",
 372                                 (unsigned long) ext2fs_blocks_count(sb));
 373                 }
 374         }
 375
 376         /* Next, read the journal superblock */
 377
 378         retval = read_journal_block(cmdname, source, blocknr*blocksize,
 379                                     jsb_buffer, 1024);
 380         if (retval)
 381                 return;
 382
 383         jsb = (journal_superblock_t *) jsb_buffer;
 384         if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
 385                 fprintf(out_file,
 386                         "Journal superblock magic number invalid!\n");
 387                 return;
 388         }
 389         blocksize = be32_to_cpu(jsb->s_blocksize);
 390         transaction = be32_to_cpu(jsb->s_sequence);
 391         blocknr = be32_to_cpu(jsb->s_start);
 392
 393         fprintf(out_file, "Journal starts at block %u, transaction %u\n",
 394                 blocknr, transaction);
 395
 396         if (!blocknr)
 397                 /* Empty journal, nothing to do. */
 398                 return;
 399
 400         while (1) {
 401                 retval = read_journal_block(cmdname, source,
 402                                             blocknr*blocksize, buf,
 403                                             blocksize);
 404                 if (retval)
 405                         return;
 406
 407                 header = (journal_header_t *) buf;
 408
 409                 magic = be32_to_cpu(header->h_magic);
 410                 sequence = be32_to_cpu(header->h_sequence);
 411                 blocktype = be32_to_cpu(header->h_blocktype);
 412
 413                 if (magic != JFS_MAGIC_NUMBER) {
 414                         fprintf (out_file, "No magic number at block %u: "
 415                                  "end of journal.\n", blocknr);
 416                         return;
 417                 }
 418
 419                 if (sequence != transaction) {
 420                         fprintf (out_file, "Found sequence %u (not %u) at "
 421                                  "block %u: end of journal.\n",
 422                                  sequence, transaction, blocknr);
 423                         return;
 424                 }
 425
 426                 if (dump_descriptors) {
 427                         fprintf (out_file, "Found expected sequence %u, "
 428                                  "type %u (%s) at block %u\n",
 429                                  sequence, blocktype,
 430                                  type_to_name(blocktype), blocknr);
 431                 }
 432
 433                 switch (blocktype) {
 434                 case JFS_DESCRIPTOR_BLOCK:
 435                         dump_descriptor_block(out_file, source, buf, jsb,
 436                                               &blocknr, blocksize,
 437                                               transaction);
 438                         continue;
 439
 440                 case JFS_COMMIT_BLOCK:
 441                         transaction++;
 442                         blocknr++;
 443                         WRAP(jsb, blocknr);
 444                         continue;
 445
 446                 case JFS_REVOKE_BLOCK:
 447                         dump_revoke_block(out_file, buf, jsb,
 448                                           blocknr, blocksize,
 449                                           transaction);
 450                         blocknr++;
 451                         WRAP(jsb, blocknr);
 452                         continue;
 453
 454                 default:
 455                         fprintf (out_file, "Unexpected block type %u at "
 456                                  "block %u.\n", blocktype, blocknr);
 457                         return;
 458                 }
 459         }
 460 }
 461
 462
 463 static void dump_descriptor_block(FILE *out_file,
 464                                   struct journal_source *source,
 465                                   char *buf,
 466                                   journal_superblock_t *jsb,
 467                                   unsigned int *blockp, int blocksize,
 468                                   tid_t transaction)
 469 {
 470         int                     offset, tag_size = JBD_TAG_SIZE32;
 471         char                    *tagp;
 472         journal_block_tag_t     *tag;
 473         unsigned int            blocknr;
 474         __u32                   tag_block;
 475         __u32                   tag_flags;
 476
 477         if (be32_to_cpu(jsb->s_feature_incompat) & JFS_FEATURE_INCOMPAT_64BIT)
 478                 tag_size = JBD_TAG_SIZE64;
 479
 480         offset = sizeof(journal_header_t);
 481         blocknr = *blockp;
 482
 483         if (dump_all)
 484                 fprintf(out_file, "Dumping descriptor block, sequence %u, at "
 485                         "block %u:\n", transaction, blocknr);
 486
 487         ++blocknr;
 488         WRAP(jsb, blocknr);
 489
 490         do {
 491                 /* Work out the location of the current tag, and skip to
 492                  * the next one... */
 493                 tagp = &buf[offset];
 494                 tag = (journal_block_tag_t *) tagp;
 495                 offset += tag_size;
 496
 497                 /* ... and if we have gone too far, then we've reached the
 498                    end of this block. */
 499                 if (offset > blocksize)
 500                         break;
 501
 502                 tag_block = be32_to_cpu(tag->t_blocknr);
 503                 tag_flags = be32_to_cpu(tag->t_flags);
 504
 505                 if (!(tag_flags & JFS_FLAG_SAME_UUID))
 506                         offset += 16;
 507
 508                 dump_metadata_block(out_file, source, jsb,
 509                                     blocknr, tag_block, tag_flags, blocksize,
 510                                     transaction);
 511
 512                 ++blocknr;
 513                 WRAP(jsb, blocknr);
 514
 515         } while (!(tag_flags & JFS_FLAG_LAST_TAG));
 516
 517         *blockp = blocknr;
 518 }
 519
 520
 521 static void dump_revoke_block(FILE *out_file, char *buf,
 522                               journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 523                               unsigned int blocknr,
 524                               int blocksize EXT2FS_ATTR((unused)),
 525                               tid_t transaction)
 526 {
 527         int                     offset, max;
 528         journal_revoke_header_t *header;
 529         unsigned int            *entry, rblock;
 530
 531         if (dump_all)
 532                 fprintf(out_file, "Dumping revoke block, sequence %u, at "
 533                         "block %u:\n", transaction, blocknr);
 534
 535         header = (journal_revoke_header_t *) buf;
 536         offset = sizeof(journal_revoke_header_t);
 537         max = be32_to_cpu(header->r_count);
 538
 539         while (offset < max) {
 540                 entry = (unsigned int *) (buf + offset);
 541                 rblock = be32_to_cpu(*entry);
 542                 if (dump_all || rblock == block_to_dump) {
 543                         fprintf(out_file, "  Revoke FS block %u", rblock);
 544                         if (dump_all)
 545                                 fprintf(out_file, "\n");
 546                         else
 547                                 fprintf(out_file," at block %u, sequence %u\n",
 548                                         blocknr, transaction);
 549                 }
 550                 offset += 4;
 551         }
 552 }
 553
 554
 555 static void show_extent(FILE *out_file, int start_extent, int end_extent,
 556                         __u32 first_block)
 557 {
 558         if (start_extent >= 0 && first_block != 0)
 559                 fprintf(out_file, "(%d+%u): %u ",
 560                         start_extent, end_extent-start_extent, first_block);
 561 }
 562
 563 static void show_indirect(FILE *out_file, const char *name, __u32 where)
 564 {
 565         if (where)
 566                 fprintf(out_file, "(%s): %u ", name, where);
 567 }
 568
 569
 570 static void dump_metadata_block(FILE *out_file, struct journal_source *source,
 571                                 journal_superblock_t *jsb EXT2FS_ATTR((unused)),
 572                                 unsigned int log_blocknr,
 573                                 unsigned int fs_blocknr,
 574                                 unsigned int log_tag_flags,
 575                                 int blocksize,
 576                                 tid_t transaction)
 577 {
 578         int             retval;
 579         char            buf[8192];
 580
 581         if (!(dump_all
 582               || (fs_blocknr == block_to_dump)
 583               || (fs_blocknr == inode_block_to_dump)
 584               || (fs_blocknr == bitmap_to_dump)))
 585                 return;
 586
 587         fprintf(out_file, "  FS block %u logged at ", fs_blocknr);
 588         if (!dump_all)
 589                 fprintf(out_file, "sequence %u, ", transaction);
 590         fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
 591                 log_tag_flags);
 592
 593         /* There are two major special cases to parse:
 594          *
 595          * If this block is a block
 596          * bitmap block, we need to give it special treatment so that we
 597          * can log any allocates and deallocates which affect the
 598          * block_to_dump query block.
 599          *
 600          * If the block is an inode block for the inode being searched
 601          * for, then we need to dump the contents of that inode
 602          * structure symbolically.
 603          */
 604
 605         if (!(dump_contents && dump_all)
 606             && fs_blocknr != block_to_dump
 607             && fs_blocknr != bitmap_to_dump
 608             && fs_blocknr != inode_block_to_dump)
 609                 return;
 610
 611         retval = read_journal_block("logdump", source,
 612                                     blocksize * log_blocknr,
 613                                     buf, blocksize);
 614         if (retval)
 615                 return;
 616
 617         if (fs_blocknr == bitmap_to_dump) {
 618                 struct ext2_super_block *super;
 619                 int offset;
 620
 621                 super = current_fs->super;
 622                 offset = ((block_to_dump - super->s_first_data_block) %
 623                           super->s_blocks_per_group);
 624
 625                 fprintf(out_file, "    (block bitmap for block %llu: "
 626                         "block is %s)\n",
 627                         block_to_dump,
 628                         ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
 629         }
 630
 631         if (fs_blocknr == inode_block_to_dump) {
 632                 struct ext2_inode *inode;
 633                 int first, prev, this, start_extent, i;
 634
 635                 fprintf(out_file, "    (inode block for inode %u):\n",
 636                         inode_to_dump);
 637
 638                 inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
 639                 internal_dump_inode(out_file, "    ", inode_to_dump, inode, 0);
 640
 641                 /* Dump out the direct/indirect blocks here:
 642                  * internal_dump_inode can only dump them from the main
 643                  * on-disk inode, not from the journaled copy of the
 644                  * inode. */
 645
 646                 fprintf (out_file, "    Blocks:  ");
 647                 first = prev = start_extent = -1;
 648
 649                 for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
 650                         this = inode->i_block[i];
 651                         if (start_extent >= 0  && this == prev+1) {
 652                                 prev = this;
 653                                 continue;
 654                         } else {
 655                                 show_extent(out_file, start_extent, i, first);
 656                                 start_extent = i;
 657                                 first = prev = this;
 658                         }
 659                 }
 660                 show_extent(out_file, start_extent, i, first);
 661                 show_indirect(out_file, "IND", inode->i_block[i++]);
 662                 show_indirect(out_file, "DIND", inode->i_block[i++]);
 663                 show_indirect(out_file, "TIND", inode->i_block[i++]);
 664
 665                 fprintf(out_file, "\n");
 666         }
 667
 668         if (dump_contents)
 669                 do_hexdump(out_file, buf, blocksize);
 670
 671 }
 672
 673 static void do_hexdump (FILE *out_file, char *buf, int blocksize)
 674 {
 675         int i,j;
 676         int *intp;
 677         char *charp;
 678         unsigned char c;
 679
 680         intp = (int *) buf;
 681         charp = (char *) buf;
 682
 683         for (i=0; i<blocksize; i+=16) {
 684                 fprintf(out_file, "    %04x:  ", i);
 685                 for (j=0; j<16; j+=4)
 686                         fprintf(out_file, "%08x ", *intp++);
 687                 for (j=0; j<16; j++) {
 688                         c = *charp++;
 689                         if (c < ' ' || c >= 127)
 690                                 c = '.';
 691                         fprintf(out_file, "%c", c);
 692                 }
 693                 fprintf(out_file, "\n");
 694         }
 695 }
 696