coreutils/dd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini dd implementation for busybox
   4  *
   5  * Copyright (C) 2000,2001  Matt Kraai
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 //config:config DD
  10 //config:       bool "dd (7.1 kb)"
  11 //config:       default y
  12 //config:       help
  13 //config:       dd copies a file (from standard input to standard output,
  14 //config:       by default) using specific input and output blocksizes,
  15 //config:       while optionally performing conversions on it.
  16 //config:
  17 //config:config FEATURE_DD_SIGNAL_HANDLING
  18 //config:       bool "Enable signal handling for status reporting"
  19 //config:       default y
  20 //config:       depends on DD
  21 //config:       help
  22 //config:       Sending a SIGUSR1 signal to a running 'dd' process makes it
  23 //config:       print to standard error the number of records read and written
  24 //config:       so far, then to resume copying.
  25 //config:
  26 //config:       $ dd if=/dev/zero of=/dev/null &
  27 //config:       $ pid=$!; kill -USR1 $pid; sleep 1; kill $pid
  28 //config:       10899206+0 records in
  29 //config:       10899206+0 records out
  30 //config:
  31 //config:config FEATURE_DD_THIRD_STATUS_LINE
  32 //config:       bool "Enable the third status line upon signal"
  33 //config:       default y
  34 //config:       depends on DD && FEATURE_DD_SIGNAL_HANDLING
  35 //config:       help
  36 //config:       Displays a coreutils-like third status line with transferred bytes,
  37 //config:       elapsed time and speed.
  38 //config:
  39 //config:config FEATURE_DD_IBS_OBS
  40 //config:       bool "Enable ibs, obs, iflag, oflag and conv options"
  41 //config:       default y
  42 //config:       depends on DD
  43 //config:       help
  44 //config:       Enable support for writing a certain number of bytes in and out,
  45 //config:       at a time, and performing conversions on the data stream.
  46 //config:
  47 //config:config FEATURE_DD_STATUS
  48 //config:       bool "Enable status display options"
  49 //config:       default y
  50 //config:       depends on DD
  51 //config:       help
  52 //config:       Enable support for status=noxfer/none option.
  53
  54 //applet:IF_DD(APPLET_NOEXEC(dd, dd, BB_DIR_BIN, BB_SUID_DROP, dd))
  55
  56 //kbuild:lib-$(CONFIG_DD) += dd.o
  57
  58 //usage:#define dd_trivial_usage
  59 //usage:       "[if=FILE] [of=FILE] [" IF_FEATURE_DD_IBS_OBS("ibs=N obs=N/") "bs=N] [count=N] [skip=N] [seek=N]\n"
  60 //usage:        IF_FEATURE_DD_IBS_OBS(
  61 //usage:       "        [conv=notrunc|noerror|sync|fsync]\n"
  62 //usage:       "        [iflag=skip_bytes|fullblock] [oflag=seek_bytes]"
  63 //usage:        )
  64 //usage:#define dd_full_usage "\n\n"
  65 //usage:       "Copy a file with converting and formatting\n"
  66 //usage:     "\n        if=FILE         Read from FILE instead of stdin"
  67 //usage:     "\n        of=FILE         Write to FILE instead of stdout"
  68 //usage:     "\n        bs=N            Read and write N bytes at a time"
  69 //usage:        IF_FEATURE_DD_IBS_OBS(
  70 //usage:     "\n        ibs=N           Read N bytes at a time"
  71 //usage:        )
  72 //usage:        IF_FEATURE_DD_IBS_OBS(
  73 //usage:     "\n        obs=N           Write N bytes at a time"
  74 //usage:        )
  75 //usage:     "\n        count=N         Copy only N input blocks"
  76 //usage:     "\n        skip=N          Skip N input blocks"
  77 //usage:     "\n        seek=N          Skip N output blocks"
  78 //usage:        IF_FEATURE_DD_IBS_OBS(
  79 //usage:     "\n        conv=notrunc    Don't truncate output file"
  80 //usage:     "\n        conv=noerror    Continue after read errors"
  81 //usage:     "\n        conv=sync       Pad blocks with zeros"
  82 //usage:     "\n        conv=fsync      Physically write data out before finishing"
  83 //usage:     "\n        conv=swab       Swap every pair of bytes"
  84 //usage:     "\n        iflag=skip_bytes        skip=N is in bytes"
  85 //usage:     "\n        iflag=fullblock Read full blocks"
  86 //usage:     "\n        oflag=seek_bytes        seek=N is in bytes"
  87 //usage:        )
  88 //usage:        IF_FEATURE_DD_STATUS(
  89 //usage:     "\n        status=noxfer   Suppress rate output"
  90 //usage:     "\n        status=none     Suppress all output"
  91 //usage:        )
  92 //usage:     "\n"
  93 //usage:     "\nN may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G"
  94 //usage:
  95 //usage:#define dd_example_usage
  96 //usage:       "$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4\n"
  97 //usage:       "4+0 records in\n"
  98 //usage:       "4+0 records out\n"
  99
 100 #include "libbb.h"
 101 #include "common_bufsiz.h"
 102
 103 /* This is a NOEXEC applet. Be very careful! */
 104
 105
 106 enum {
 107         ifd = STDIN_FILENO,
 108         ofd = STDOUT_FILENO,
 109 };
 110
 111 struct globals {
 112         off_t out_full, out_part, in_full, in_part;
 113 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 114         unsigned long long total_bytes;
 115         unsigned long long begin_time_us;
 116 #endif
 117         int flags;
 118 } FIX_ALIASING;
 119 #define G (*(struct globals*)bb_common_bufsiz1)
 120 #define INIT_G() do { \
 121         setup_common_bufsiz(); \
 122         /* we have to zero it out because of NOEXEC */ \
 123         memset(&G, 0, sizeof(G)); \
 124 } while (0)
 125
 126 enum {
 127         /* Must be in the same order as OP_conv_XXX! */
 128         /* (see "flags |= (1 << what)" below) */
 129         FLAG_NOTRUNC = (1 << 0) * ENABLE_FEATURE_DD_IBS_OBS,
 130         FLAG_SYNC    = (1 << 1) * ENABLE_FEATURE_DD_IBS_OBS,
 131         FLAG_NOERROR = (1 << 2) * ENABLE_FEATURE_DD_IBS_OBS,
 132         FLAG_FSYNC   = (1 << 3) * ENABLE_FEATURE_DD_IBS_OBS,
 133         FLAG_SWAB    = (1 << 4) * ENABLE_FEATURE_DD_IBS_OBS,
 134         /* end of conv flags */
 135         /* start of input flags */
 136         FLAG_IFLAG_SHIFT = 5,
 137         FLAG_SKIP_BYTES = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
 138         FLAG_FULLBLOCK = (1 << 6) * ENABLE_FEATURE_DD_IBS_OBS,
 139         /* end of input flags */
 140         /* start of output flags */
 141         FLAG_OFLAG_SHIFT = 7,
 142         FLAG_SEEK_BYTES = (1 << 7) * ENABLE_FEATURE_DD_IBS_OBS,
 143         /* end of output flags */
 144         FLAG_TWOBUFS = (1 << 8) * ENABLE_FEATURE_DD_IBS_OBS,
 145         FLAG_COUNT   = 1 << 9,
 146         FLAG_STATUS_NONE = 1 << 10,
 147         FLAG_STATUS_NOXFER = 1 << 11,
 148 };
 149
 150 static void dd_output_status(int UNUSED_PARAM cur_signal)
 151 {
 152 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 153         double seconds;
 154         unsigned long long bytes_sec;
 155         unsigned long long now_us = monotonic_us(); /* before fprintf */
 156 #endif
 157
 158         /* Deliberately using %u, not %d */
 159         fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n"
 160                         "%"OFF_FMT"u+%"OFF_FMT"u records out\n",
 161                         G.in_full, G.in_part,
 162                         G.out_full, G.out_part);
 163
 164 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 165 # if ENABLE_FEATURE_DD_STATUS
 166         if (G.flags & FLAG_STATUS_NOXFER) /* status=noxfer active? */
 167                 return;
 168         //TODO: should status=none make dd stop reacting to USR1 entirely?
 169         //So far we react to it (we print the stats),
 170         //status=none only suppresses final, non-USR1 generated status message.
 171 # endif
 172         fprintf(stderr, "%llu bytes (%sB) copied, ",
 173                         G.total_bytes,
 174                         /* show fractional digit, use suffixes */
 175                         make_human_readable_str(G.total_bytes, 1, 0)
 176         );
 177         /* Corner cases:
 178          * ./busybox dd </dev/null >/dev/null
 179          * ./busybox dd bs=1M count=2000 </dev/zero >/dev/null
 180          * (echo DONE) | ./busybox dd >/dev/null
 181          * (sleep 1; echo DONE) | ./busybox dd >/dev/null
 182          */
 183         seconds = (now_us - G.begin_time_us) / 1000000.0;
 184         bytes_sec = G.total_bytes / seconds;
 185         fprintf(stderr, "%f seconds, %sB/s\n",
 186                         seconds,
 187                         /* show fractional digit, use suffixes */
 188                         make_human_readable_str(bytes_sec, 1, 0)
 189         );
 190 #endif
 191 }
 192
 193 static ssize_t full_write_or_warn(const void *buf, size_t len,
 194         const char *const filename)
 195 {
 196         ssize_t n = full_write(ofd, buf, len);
 197         if (n < 0)
 198                 bb_perror_msg("writing '%s'", filename);
 199         return n;
 200 }
 201
 202 static bool write_and_stats(const void *buf, size_t len, size_t obs,
 203         const char *filename)
 204 {
 205         ssize_t n = full_write_or_warn(buf, len, filename);
 206         if (n < 0)
 207                 return 1;
 208 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 209         G.total_bytes += n;
 210 #endif
 211         if ((size_t)n == obs) {
 212                 G.out_full++;
 213                 return 0;
 214         }
 215         if ((size_t)n == len) {
 216                 G.out_part++;
 217                 return 0;
 218         }
 219         return 1;
 220 }
 221
 222 #if ENABLE_LFS
 223 # define XATOU_SFX xatoull_sfx
 224 #else
 225 # define XATOU_SFX xatoul_sfx
 226 #endif
 227
 228 #if ENABLE_FEATURE_DD_IBS_OBS
 229 static int parse_comma_flags(char *val, const char *words, const char *error_in)
 230 {
 231         int flags = 0;
 232         while (1) {
 233                 int n;
 234                 char *arg;
 235                 /* find ',', replace them with NUL so we can use val for
 236                  * index_in_strings() without copying.
 237                  * We rely on val being non-null, else strchr would fault.
 238                  */
 239                 arg = strchr(val, ',');
 240                 if (arg)
 241                         *arg = '\0';
 242                 n = index_in_strings(words, val);
 243                 if (n < 0)
 244                         bb_error_msg_and_die(bb_msg_invalid_arg_to, val, error_in);
 245                 flags |= (1 << n);
 246                 if (!arg) /* no ',' left, so this was the last specifier */
 247                         break;
 248                 *arg = ','; /* to preserve ps listing */
 249                 val = arg + 1; /* skip this keyword and ',' */
 250         }
 251         return flags;
 252 }
 253 #endif
 254
 255 int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 256 int dd_main(int argc UNUSED_PARAM, char **argv)
 257 {
 258         static const char keywords[] ALIGN1 =
 259                 "bs\0""count\0""seek\0""skip\0""if\0""of\0"IF_FEATURE_DD_STATUS("status\0")
 260 #if ENABLE_FEATURE_DD_IBS_OBS
 261                 "ibs\0""obs\0""conv\0""iflag\0""oflag\0"
 262 #endif
 263                 ;
 264 #if ENABLE_FEATURE_DD_IBS_OBS
 265         static const char conv_words[] ALIGN1 =
 266                 "notrunc\0""sync\0""noerror\0""fsync\0""swab\0";
 267         static const char iflag_words[] ALIGN1 =
 268                 "skip_bytes\0""fullblock\0";
 269         static const char oflag_words[] ALIGN1 =
 270                 "seek_bytes\0";
 271 #endif
 272 #if ENABLE_FEATURE_DD_STATUS
 273         static const char status_words[] ALIGN1 =
 274                 "none\0""noxfer\0";
 275 #endif
 276         enum {
 277                 OP_bs = 0,
 278                 OP_count,
 279                 OP_seek,
 280                 OP_skip,
 281                 OP_if,
 282                 OP_of,
 283                 IF_FEATURE_DD_STATUS(OP_status,)
 284 #if ENABLE_FEATURE_DD_IBS_OBS
 285                 OP_ibs,
 286                 OP_obs,
 287                 OP_conv,
 288                 OP_iflag,
 289                 OP_oflag,
 290                 /* Must be in the same order as FLAG_XXX! */
 291                 OP_conv_notrunc = 0,
 292                 OP_conv_sync,
 293                 OP_conv_noerror,
 294                 OP_conv_fsync,
 295                 OP_conv_swab,
 296         /* Unimplemented conv=XXX: */
 297         //nocreat       do not create the output file
 298         //excl          fail if the output file already exists
 299         //fdatasync     physically write output file data before finishing
 300         //lcase         change upper case to lower case
 301         //ucase         change lower case to upper case
 302         //block         pad newline-terminated records with spaces to cbs-size
 303         //unblock       replace trailing spaces in cbs-size records with newline
 304         //ascii         from EBCDIC to ASCII
 305         //ebcdic        from ASCII to EBCDIC
 306         //ibm           from ASCII to alternate EBCDIC
 307         /* Partially implemented: */
 308         //swab          swap every pair of input bytes: will abort on non-even reads
 309                 OP_iflag_skip_bytes,
 310                 OP_iflag_fullblock,
 311                 OP_oflag_seek_bytes,
 312 #endif
 313         };
 314         smallint exitcode = EXIT_FAILURE;
 315         int i;
 316         size_t ibs = 512;
 317         char *ibuf;
 318 #if ENABLE_FEATURE_DD_IBS_OBS
 319         size_t obs = 512;
 320         char *obuf;
 321 #else
 322 # define obs  ibs
 323 # define obuf ibuf
 324 #endif
 325         /* These are all zeroed at once! */
 326         struct {
 327                 IF_FEATURE_DD_IBS_OBS(size_t ocount;)
 328                 ssize_t prev_read_size; /* for detecting swab failure */
 329                 off_t count;
 330                 off_t seek, skip;
 331                 const char *infile, *outfile;
 332         } Z;
 333 #define ocount  (Z.ocount )
 334 #define prev_read_size (Z.prev_read_size)
 335 #define count   (Z.count  )
 336 #define seek    (Z.seek   )
 337 #define skip    (Z.skip   )
 338 #define infile  (Z.infile )
 339 #define outfile (Z.outfile)
 340
 341         memset(&Z, 0, sizeof(Z));
 342         INIT_G();
 343         //fflush_all(); - is this needed because of NOEXEC?
 344
 345         for (i = 1; argv[i]; i++) {
 346                 int what;
 347                 char *val;
 348                 char *arg = argv[i];
 349
 350 #if ENABLE_DESKTOP
 351                 /* "dd --". NB: coreutils 6.9 will complain if they see
 352                  * more than one of them. We wouldn't. */
 353                 if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0')
 354                         continue;
 355 #endif
 356                 val = strchr(arg, '=');
 357                 if (val == NULL)
 358                         bb_show_usage();
 359                 *val = '\0';
 360                 what = index_in_strings(keywords, arg);
 361                 if (what < 0)
 362                         bb_show_usage();
 363                 /* *val = '='; - to preserve ps listing? */
 364                 val++;
 365 #if ENABLE_FEATURE_DD_IBS_OBS
 366                 if (what == OP_ibs) {
 367                         /* Must fit into positive ssize_t */
 368                         ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 369                         /*continue;*/
 370                 }
 371                 if (what == OP_obs) {
 372                         obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 373                         /*continue;*/
 374                 }
 375                 if (what == OP_conv) {
 376                         G.flags |= parse_comma_flags(val, conv_words, "conv");
 377                         /*continue;*/
 378                 }
 379                 if (what == OP_iflag) {
 380                         G.flags |= parse_comma_flags(val, iflag_words, "iflag") << FLAG_IFLAG_SHIFT;
 381                         /*continue;*/
 382                 }
 383                 if (what == OP_oflag) {
 384                         G.flags |= parse_comma_flags(val, oflag_words, "oflag") << FLAG_OFLAG_SHIFT;
 385                         /*continue;*/
 386                 }
 387 #endif
 388                 if (what == OP_bs) {
 389                         ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 390                         obs = ibs;
 391                         /*continue;*/
 392                 }
 393                 /* These can be large: */
 394                 if (what == OP_count) {
 395                         G.flags |= FLAG_COUNT;
 396                         count = XATOU_SFX(val, cwbkMG_suffixes);
 397                         /*continue;*/
 398                 }
 399                 if (what == OP_seek) {
 400                         seek = XATOU_SFX(val, cwbkMG_suffixes);
 401                         /*continue;*/
 402                 }
 403                 if (what == OP_skip) {
 404                         skip = XATOU_SFX(val, cwbkMG_suffixes);
 405                         /*continue;*/
 406                 }
 407                 if (what == OP_if) {
 408                         infile = val;
 409                         /*continue;*/
 410                 }
 411                 if (what == OP_of) {
 412                         outfile = val;
 413                         /*continue;*/
 414                 }
 415 #if ENABLE_FEATURE_DD_STATUS
 416                 if (what == OP_status) {
 417                         int n;
 418                         n = index_in_strings(status_words, val);
 419                         if (n < 0)
 420                                 bb_error_msg_and_die(bb_msg_invalid_arg_to, val, "status");
 421                         G.flags |= FLAG_STATUS_NONE << n;
 422                         /*continue;*/
 423                 }
 424 #endif
 425         } /* end of "for (argv[i])" */
 426
 427 //XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
 428         ibuf = xmalloc(ibs);
 429         obuf = ibuf;
 430 #if ENABLE_FEATURE_DD_IBS_OBS
 431         if (ibs != obs) {
 432                 G.flags |= FLAG_TWOBUFS;
 433                 obuf = xmalloc(obs);
 434         }
 435 #endif
 436
 437 #if ENABLE_FEATURE_DD_SIGNAL_HANDLING
 438         signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
 439 #endif
 440 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 441         G.begin_time_us = monotonic_us();
 442 #endif
 443
 444         if (infile) {
 445                 xmove_fd(xopen(infile, O_RDONLY), ifd);
 446         } else {
 447                 infile = bb_msg_standard_input;
 448         }
 449         if (outfile) {
 450                 int oflag = O_WRONLY | O_CREAT;
 451
 452                 if (!seek && !(G.flags & FLAG_NOTRUNC))
 453                         oflag |= O_TRUNC;
 454
 455                 xmove_fd(xopen(outfile, oflag), ofd);
 456
 457                 if (seek && !(G.flags & FLAG_NOTRUNC)) {
 458                         size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
 459                         if (ftruncate(ofd, seek * blocksz) < 0) {
 460                                 struct stat st;
 461
 462                                 if (fstat(ofd, &st) < 0
 463                                  || S_ISREG(st.st_mode)
 464                                  || S_ISDIR(st.st_mode)
 465                                 ) {
 466                                         goto die_outfile;
 467                                 }
 468                         }
 469                 }
 470         } else {
 471                 outfile = bb_msg_standard_output;
 472         }
 473         if (skip) {
 474                 size_t blocksz = (G.flags & FLAG_SKIP_BYTES) ? 1 : ibs;
 475                 if (lseek(ifd, skip * blocksz, SEEK_CUR) < 0) {
 476                         do {
 477                                 ssize_t n;
 478 #if ENABLE_FEATURE_DD_IBS_OBS
 479                                 if (G.flags & FLAG_FULLBLOCK)
 480                                         n = full_read(ifd, ibuf, blocksz);
 481                                 else
 482 #endif
 483                                         n = safe_read(ifd, ibuf, blocksz);
 484                                 if (n < 0)
 485                                         goto die_infile;
 486                                 if (n == 0)
 487                                         break;
 488                         } while (--skip != 0);
 489                 }
 490         }
 491         if (seek) {
 492                 size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
 493                 if (lseek(ofd, seek * blocksz, SEEK_CUR) < 0)
 494                         goto die_outfile;
 495         }
 496
 497         while (!(G.flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
 498                 ssize_t n;
 499 #if ENABLE_FEATURE_DD_IBS_OBS
 500                 if (G.flags & FLAG_FULLBLOCK)
 501                         n = full_read(ifd, ibuf, ibs);
 502                 else
 503 #endif
 504                         n = safe_read(ifd, ibuf, ibs);
 505                 if (n == 0)
 506                         break;
 507                 if (n < 0) {
 508                         /* "Bad block" */
 509                         if (!(G.flags & FLAG_NOERROR))
 510                                 goto die_infile;
 511                         bb_simple_perror_msg(infile);
 512                         /* GNU dd with conv=noerror skips over bad blocks */
 513                         xlseek(ifd, ibs, SEEK_CUR);
 514                         /* conv=noerror,sync writes NULs,
 515                          * conv=noerror just ignores input bad blocks */
 516                         n = 0;
 517                 }
 518                 if (G.flags & FLAG_SWAB) {
 519                         uint16_t *p16;
 520                         ssize_t n2;
 521
 522                         /* Our code allows only last read to be odd-sized */
 523                         if (prev_read_size & 1)
 524                                 bb_error_msg_and_die("can't swab %lu byte buffer",
 525                                                 (unsigned long)prev_read_size);
 526                         prev_read_size = n;
 527
 528                         /* If n is odd, last byte is not swapped:
 529                          *  echo -n "qwe" | dd conv=swab
 530                          * prints "wqe".
 531                          */
 532                         p16 = (void*) ibuf;
 533                         n2 = (n >> 1);
 534                         while (--n2 >= 0) {
 535                                 *p16 = bswap_16(*p16);
 536                                 p16++;
 537                         }
 538                 }
 539                 if ((size_t)n == ibs)
 540                         G.in_full++;
 541                 else {
 542                         G.in_part++;
 543                         if (G.flags & FLAG_SYNC) {
 544                                 memset(ibuf + n, 0, ibs - n);
 545                                 n = ibs;
 546                         }
 547                 }
 548 #if ENABLE_FEATURE_DD_IBS_OBS
 549                 if (G.flags & FLAG_TWOBUFS) {
 550                         char *tmp = ibuf;
 551                         while (n) {
 552                                 size_t d = obs - ocount;
 553                                 if (d > (size_t)n)
 554                                         d = n;
 555                                 memcpy(obuf + ocount, tmp, d);
 556                                 n -= d;
 557                                 tmp += d;
 558                                 ocount += d;
 559                                 if (ocount == obs) {
 560                                         if (write_and_stats(obuf, obs, obs, outfile))
 561                                                 goto out_status;
 562                                         ocount = 0;
 563                                 }
 564                         }
 565                 } else
 566 #endif
 567                 {
 568                         if (write_and_stats(ibuf, n, obs, outfile))
 569                                 goto out_status;
 570                 }
 571         }
 572
 573         if (G.flags & FLAG_FSYNC) {
 574                 if (fsync(ofd) < 0)
 575                         goto die_outfile;
 576         }
 577
 578 #if ENABLE_FEATURE_DD_IBS_OBS
 579         if (ocount != 0) {
 580                 if (write_and_stats(obuf, ocount, obs, outfile))
 581                         goto out_status;
 582         }
 583 #endif
 584         if (close(ifd) < 0) {
 585  die_infile:
 586                 bb_simple_perror_msg_and_die(infile);
 587         }
 588
 589         if (close(ofd) < 0) {
 590  die_outfile:
 591                 bb_simple_perror_msg_and_die(outfile);
 592         }
 593
 594         exitcode = EXIT_SUCCESS;
 595  out_status:
 596         if (!ENABLE_FEATURE_DD_STATUS || !(G.flags & FLAG_STATUS_NONE))
 597                 dd_output_status(0);
 598
 599         if (ENABLE_FEATURE_CLEAN_UP) {
 600                 free(obuf);
 601                 if (G.flags & FLAG_TWOBUFS)
 602                         free(ibuf);
 603         }
 604
 605         return exitcode;
 606 }