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 (7.5 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|append]"
  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:     "\n        oflag=append    Open output file in append mode"
  88 //usage:        )
  89 //usage:        IF_FEATURE_DD_STATUS(
  90 //usage:     "\n        status=noxfer   Suppress rate output"
  91 //usage:     "\n        status=none     Suppress all output"
  92 //usage:        )
  93 //usage:     "\n"
  94 //usage:     "\nN may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G"
  95 //usage:
  96 //usage:#define dd_example_usage
  97 //usage:       "$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4\n"
  98 //usage:       "4+0 records in\n"
  99 //usage:       "4+0 records out\n"
 100
 101 #include "libbb.h"
 102 #include "common_bufsiz.h"
 103
 104 /* This is a NOEXEC applet. Be very careful! */
 105
 106
 107 enum {
 108         ifd = STDIN_FILENO,
 109         ofd = STDOUT_FILENO,
 110 };
 111
 112 struct globals {
 113         off_t out_full, out_part, in_full, in_part;
 114 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 115         unsigned long long total_bytes;
 116         unsigned long long begin_time_us;
 117 #endif
 118         int flags;
 119 } FIX_ALIASING;
 120 #define G (*(struct globals*)bb_common_bufsiz1)
 121 #define INIT_G() do { \
 122         setup_common_bufsiz(); \
 123         /* we have to zero it out because of NOEXEC */ \
 124         memset(&G, 0, sizeof(G)); \
 125 } while (0)
 126
 127 enum {
 128         /* Must be in the same order as OP_conv_XXX! */
 129         /* (see "flags |= (1 << what)" below) */
 130         FLAG_NOTRUNC = (1 << 0) * ENABLE_FEATURE_DD_IBS_OBS,
 131         FLAG_SYNC    = (1 << 1) * ENABLE_FEATURE_DD_IBS_OBS,
 132         FLAG_NOERROR = (1 << 2) * ENABLE_FEATURE_DD_IBS_OBS,
 133         FLAG_FSYNC   = (1 << 3) * ENABLE_FEATURE_DD_IBS_OBS,
 134         FLAG_SWAB    = (1 << 4) * ENABLE_FEATURE_DD_IBS_OBS,
 135         /* end of conv flags */
 136         /* start of input flags */
 137         FLAG_IFLAG_SHIFT = 5,
 138         FLAG_SKIP_BYTES = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
 139         FLAG_FULLBLOCK = (1 << 6) * ENABLE_FEATURE_DD_IBS_OBS,
 140         /* end of input flags */
 141         /* start of output flags */
 142         FLAG_OFLAG_SHIFT = 7,
 143         FLAG_SEEK_BYTES = (1 << 7) * ENABLE_FEATURE_DD_IBS_OBS,
 144         FLAG_APPEND = (1 << 8) * ENABLE_FEATURE_DD_IBS_OBS,
 145         /* end of output flags */
 146         FLAG_TWOBUFS = (1 << 9) * ENABLE_FEATURE_DD_IBS_OBS,
 147         FLAG_COUNT   = 1 << 10,
 148         FLAG_STATUS_NONE = 1 << 11,
 149         FLAG_STATUS_NOXFER = 1 << 12,
 150 };
 151
 152 static void dd_output_status(int UNUSED_PARAM cur_signal)
 153 {
 154 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 155         double seconds;
 156         unsigned long long bytes_sec;
 157         unsigned long long now_us = monotonic_us(); /* before fprintf */
 158 #endif
 159
 160         /* Deliberately using %u, not %d */
 161         fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n"
 162                         "%"OFF_FMT"u+%"OFF_FMT"u records out\n",
 163                         G.in_full, G.in_part,
 164                         G.out_full, G.out_part);
 165
 166 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 167 # if ENABLE_FEATURE_DD_STATUS
 168         if (G.flags & FLAG_STATUS_NOXFER) /* status=noxfer active? */
 169                 return;
 170         //TODO: should status=none make dd stop reacting to USR1 entirely?
 171         //So far we react to it (we print the stats),
 172         //status=none only suppresses final, non-USR1 generated status message.
 173 # endif
 174         fprintf(stderr, "%llu bytes (%sB) copied, ",
 175                         G.total_bytes,
 176                         /* show fractional digit, use suffixes */
 177                         make_human_readable_str(G.total_bytes, 1, 0)
 178         );
 179         /* Corner cases:
 180          * ./busybox dd </dev/null >/dev/null
 181          * ./busybox dd bs=1M count=2000 </dev/zero >/dev/null
 182          * (echo DONE) | ./busybox dd >/dev/null
 183          * (sleep 1; echo DONE) | ./busybox dd >/dev/null
 184          */
 185         seconds = (now_us - G.begin_time_us) / 1000000.0;
 186         bytes_sec = G.total_bytes / seconds;
 187         fprintf(stderr, "%f seconds, %sB/s\n",
 188                         seconds,
 189                         /* show fractional digit, use suffixes */
 190                         make_human_readable_str(bytes_sec, 1, 0)
 191         );
 192 #endif
 193 }
 194
 195 static bool write_and_stats(const void *buf, size_t len, size_t obs,
 196         const char *filename)
 197 {
 198         ssize_t n;
 199
 200         n = full_write(ofd, buf, len);
 201 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 202         if (n > 0)
 203                 G.total_bytes += n;
 204 #endif
 205         if ((size_t)n == obs) {
 206                 G.out_full++;
 207                 return 0;
 208         }
 209         if ((size_t)n == len) {
 210                 G.out_part++;
 211                 return 0;
 212         }
 213         /* n is < len (and possibly is -1).
 214          * Even if n >= 0, errno is usually set correctly.
 215          * For example, if writing to block device and getting ENOSPC,
 216          * full_write() first sees a short write, then tries to write
 217          * the remainder and gets errno set to ENOSPC.
 218          * It returns n > 0 (the amount which it did write).
 219          */
 220         bb_perror_msg("error writing '%s'", filename);
 221         return 1;
 222 }
 223
 224 #if ENABLE_LFS
 225 # define XATOU_SFX xatoull_sfx
 226 #else
 227 # define XATOU_SFX xatoul_sfx
 228 #endif
 229
 230 #if ENABLE_FEATURE_DD_IBS_OBS
 231 static int parse_comma_flags(char *val, const char *words, const char *error_in)
 232 {
 233         int flags = 0;
 234         while (1) {
 235                 int n;
 236                 char *arg;
 237                 /* find ',', replace them with NUL so we can use val for
 238                  * index_in_strings() without copying.
 239                  * We rely on val being non-null, else strchr would fault.
 240                  */
 241                 arg = strchr(val, ',');
 242                 if (arg)
 243                         *arg = '\0';
 244                 n = index_in_strings(words, val);
 245                 if (n < 0)
 246                         bb_error_msg_and_die(bb_msg_invalid_arg_to, val, error_in);
 247                 flags |= (1 << n);
 248                 if (!arg) /* no ',' left, so this was the last specifier */
 249                         break;
 250                 *arg = ','; /* to preserve ps listing */
 251                 val = arg + 1; /* skip this keyword and ',' */
 252         }
 253         return flags;
 254 }
 255 #endif
 256
 257 int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 258 int dd_main(int argc UNUSED_PARAM, char **argv)
 259 {
 260         static const char keywords[] ALIGN1 =
 261                 "bs\0""count\0""seek\0""skip\0""if\0""of\0"IF_FEATURE_DD_STATUS("status\0")
 262 #if ENABLE_FEATURE_DD_IBS_OBS
 263                 "ibs\0""obs\0""conv\0""iflag\0""oflag\0"
 264 #endif
 265                 ;
 266 #if ENABLE_FEATURE_DD_IBS_OBS
 267         static const char conv_words[] ALIGN1 =
 268                 "notrunc\0""sync\0""noerror\0""fsync\0""swab\0";
 269         static const char iflag_words[] ALIGN1 =
 270                 "skip_bytes\0""fullblock\0";
 271         static const char oflag_words[] ALIGN1 =
 272                 "seek_bytes\0append\0";
 273 #endif
 274 #if ENABLE_FEATURE_DD_STATUS
 275         static const char status_words[] ALIGN1 =
 276                 "none\0""noxfer\0";
 277 #endif
 278         enum {
 279                 OP_bs = 0,
 280                 OP_count,
 281                 OP_seek,
 282                 OP_skip,
 283                 OP_if,
 284                 OP_of,
 285                 IF_FEATURE_DD_STATUS(OP_status,)
 286 #if ENABLE_FEATURE_DD_IBS_OBS
 287                 OP_ibs,
 288                 OP_obs,
 289                 OP_conv,
 290                 OP_iflag,
 291                 OP_oflag,
 292                 /* Must be in the same order as FLAG_XXX! */
 293                 OP_conv_notrunc = 0,
 294                 OP_conv_sync,
 295                 OP_conv_noerror,
 296                 OP_conv_fsync,
 297                 OP_conv_swab,
 298         /* Unimplemented conv=XXX: */
 299         //nocreat       do not create the output file
 300         //excl          fail if the output file already exists
 301         //fdatasync     physically write output file data before finishing
 302         //lcase         change upper case to lower case
 303         //ucase         change lower case to upper case
 304         //block         pad newline-terminated records with spaces to cbs-size
 305         //unblock       replace trailing spaces in cbs-size records with newline
 306         //ascii         from EBCDIC to ASCII
 307         //ebcdic        from ASCII to EBCDIC
 308         //ibm           from ASCII to alternate EBCDIC
 309         /* Partially implemented: */
 310         //swab          swap every pair of input bytes: will abort on non-even reads
 311                 OP_iflag_skip_bytes,
 312                 OP_iflag_fullblock,
 313                 OP_oflag_seek_bytes,
 314 #endif
 315         };
 316         smallint exitcode = EXIT_FAILURE;
 317         int i;
 318         size_t ibs = 512;
 319         char *ibuf;
 320 #if ENABLE_FEATURE_DD_IBS_OBS
 321         size_t obs = 512;
 322         char *obuf;
 323 #else
 324 # define obs  ibs
 325 # define obuf ibuf
 326 #endif
 327         /* These are all zeroed at once! */
 328         struct {
 329                 IF_FEATURE_DD_IBS_OBS(size_t ocount;)
 330                 ssize_t prev_read_size; /* for detecting swab failure */
 331                 off_t count;
 332                 off_t seek, skip;
 333                 const char *infile, *outfile;
 334         } Z;
 335 #define ocount  (Z.ocount )
 336 #define prev_read_size (Z.prev_read_size)
 337 #define count   (Z.count  )
 338 #define seek    (Z.seek   )
 339 #define skip    (Z.skip   )
 340 #define infile  (Z.infile )
 341 #define outfile (Z.outfile)
 342
 343         memset(&Z, 0, sizeof(Z));
 344         INIT_G();
 345         //fflush_all(); - is this needed because of NOEXEC?
 346
 347         for (i = 1; argv[i]; i++) {
 348                 int what;
 349                 char *val;
 350                 char *arg = argv[i];
 351
 352 #if ENABLE_DESKTOP
 353                 /* "dd --". NB: coreutils 6.9 will complain if they see
 354                  * more than one of them. We wouldn't. */
 355                 if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0')
 356                         continue;
 357 #endif
 358                 val = strchr(arg, '=');
 359                 if (val == NULL)
 360                         bb_show_usage();
 361                 *val = '\0';
 362                 what = index_in_strings(keywords, arg);
 363                 if (what < 0)
 364                         bb_show_usage();
 365                 /* *val = '='; - to preserve ps listing? */
 366                 val++;
 367 #if ENABLE_FEATURE_DD_IBS_OBS
 368                 if (what == OP_ibs) {
 369                         /* Must fit into positive ssize_t */
 370                         ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 371                         /*continue;*/
 372                 }
 373                 if (what == OP_obs) {
 374                         obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 375                         /*continue;*/
 376                 }
 377                 if (what == OP_conv) {
 378                         G.flags |= parse_comma_flags(val, conv_words, "conv");
 379                         /*continue;*/
 380                 }
 381                 if (what == OP_iflag) {
 382                         G.flags |= parse_comma_flags(val, iflag_words, "iflag") << FLAG_IFLAG_SHIFT;
 383                         /*continue;*/
 384                 }
 385                 if (what == OP_oflag) {
 386                         G.flags |= parse_comma_flags(val, oflag_words, "oflag") << FLAG_OFLAG_SHIFT;
 387                         /*continue;*/
 388                 }
 389 #endif
 390                 if (what == OP_bs) {
 391                         ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
 392                         obs = ibs;
 393                         /*continue;*/
 394                 }
 395                 /* These can be large: */
 396                 if (what == OP_count) {
 397                         G.flags |= FLAG_COUNT;
 398                         count = XATOU_SFX(val, cwbkMG_suffixes);
 399                         /*continue;*/
 400                 }
 401                 if (what == OP_seek) {
 402                         seek = XATOU_SFX(val, cwbkMG_suffixes);
 403                         /*continue;*/
 404                 }
 405                 if (what == OP_skip) {
 406                         skip = XATOU_SFX(val, cwbkMG_suffixes);
 407                         /*continue;*/
 408                 }
 409                 if (what == OP_if) {
 410                         infile = val;
 411                         /*continue;*/
 412                 }
 413                 if (what == OP_of) {
 414                         outfile = val;
 415                         /*continue;*/
 416                 }
 417 #if ENABLE_FEATURE_DD_STATUS
 418                 if (what == OP_status) {
 419                         int n;
 420                         n = index_in_strings(status_words, val);
 421                         if (n < 0)
 422                                 bb_error_msg_and_die(bb_msg_invalid_arg_to, val, "status");
 423                         G.flags |= FLAG_STATUS_NONE << n;
 424                         /*continue;*/
 425                 }
 426 #endif
 427         } /* end of "for (argv[i])" */
 428
 429 //XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
 430         ibuf = xmalloc(ibs);
 431         obuf = ibuf;
 432 #if ENABLE_FEATURE_DD_IBS_OBS
 433         if (ibs != obs) {
 434                 G.flags |= FLAG_TWOBUFS;
 435                 obuf = xmalloc(obs);
 436         }
 437 #endif
 438
 439 #if ENABLE_FEATURE_DD_SIGNAL_HANDLING
 440         signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
 441 #endif
 442 #if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
 443         G.begin_time_us = monotonic_us();
 444 #endif
 445
 446         if (infile) {
 447                 xmove_fd(xopen(infile, O_RDONLY), ifd);
 448         } else {
 449                 infile = bb_msg_standard_input;
 450         }
 451         if (outfile) {
 452                 int oflag = O_WRONLY | O_CREAT;
 453
 454                 if (!seek && !(G.flags & FLAG_NOTRUNC))
 455                         oflag |= O_TRUNC;
 456                 if (G.flags & FLAG_APPEND)
 457                         oflag |= O_APPEND;
 458
 459                 xmove_fd(xopen(outfile, oflag), ofd);
 460
 461                 if (seek && !(G.flags & FLAG_NOTRUNC)) {
 462                         size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
 463                         if (ftruncate(ofd, seek * blocksz) < 0) {
 464                                 struct stat st;
 465
 466                                 if (fstat(ofd, &st) < 0
 467                                  || S_ISREG(st.st_mode)
 468                                  || S_ISDIR(st.st_mode)
 469                                 ) {
 470                                         goto die_outfile;
 471                                 }
 472                         }
 473                 }
 474         } else {
 475                 outfile = bb_msg_standard_output;
 476         }
 477         if (skip) {
 478                 size_t blocksz = (G.flags & FLAG_SKIP_BYTES) ? 1 : ibs;
 479                 if (lseek(ifd, skip * blocksz, SEEK_CUR) < 0) {
 480                         do {
 481                                 ssize_t n;
 482 #if ENABLE_FEATURE_DD_IBS_OBS
 483                                 if (G.flags & FLAG_FULLBLOCK)
 484                                         n = full_read(ifd, ibuf, blocksz);
 485                                 else
 486 #endif
 487                                         n = safe_read(ifd, ibuf, blocksz);
 488                                 if (n < 0)
 489                                         goto die_infile;
 490                                 if (n == 0)
 491                                         break;
 492                         } while (--skip != 0);
 493                 }
 494         }
 495         if (seek) {
 496                 size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
 497                 if (lseek(ofd, seek * blocksz, SEEK_CUR) < 0)
 498                         goto die_outfile;
 499         }
 500
 501         while (!(G.flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
 502                 ssize_t n;
 503 #if ENABLE_FEATURE_DD_IBS_OBS
 504                 if (G.flags & FLAG_FULLBLOCK)
 505                         n = full_read(ifd, ibuf, ibs);
 506                 else
 507 #endif
 508                         n = safe_read(ifd, ibuf, ibs);
 509                 if (n == 0)
 510                         break;
 511                 if (n < 0) {
 512                         /* "Bad block" */
 513                         if (!(G.flags & FLAG_NOERROR))
 514                                 goto die_infile;
 515                         bb_simple_perror_msg(infile);
 516                         /* GNU dd with conv=noerror skips over bad blocks */
 517                         xlseek(ifd, ibs, SEEK_CUR);
 518                         /* conv=noerror,sync writes NULs,
 519                          * conv=noerror just ignores input bad blocks */
 520                         n = 0;
 521                 }
 522                 if (G.flags & FLAG_SWAB) {
 523                         uint16_t *p16;
 524                         ssize_t n2;
 525
 526                         /* Our code allows only last read to be odd-sized */
 527                         if (prev_read_size & 1)
 528                                 bb_error_msg_and_die("can't swab %lu byte buffer",
 529                                                 (unsigned long)prev_read_size);
 530                         prev_read_size = n;
 531
 532                         /* If n is odd, last byte is not swapped:
 533                          *  echo -n "qwe" | dd conv=swab
 534                          * prints "wqe".
 535                          */
 536                         p16 = (void*) ibuf;
 537                         n2 = (n >> 1);
 538                         while (--n2 >= 0) {
 539                                 *p16 = bswap_16(*p16);
 540                                 p16++;
 541                         }
 542                 }
 543                 if ((size_t)n == ibs)
 544                         G.in_full++;
 545                 else {
 546                         G.in_part++;
 547                         if (G.flags & FLAG_SYNC) {
 548                                 memset(ibuf + n, 0, ibs - n);
 549                                 n = ibs;
 550                         }
 551                 }
 552 #if ENABLE_FEATURE_DD_IBS_OBS
 553                 if (G.flags & FLAG_TWOBUFS) {
 554                         char *tmp = ibuf;
 555                         while (n) {
 556                                 size_t d = obs - ocount;
 557                                 if (d > (size_t)n)
 558                                         d = n;
 559                                 memcpy(obuf + ocount, tmp, d);
 560                                 n -= d;
 561                                 tmp += d;
 562                                 ocount += d;
 563                                 if (ocount == obs) {
 564                                         if (write_and_stats(obuf, obs, obs, outfile))
 565                                                 goto out_status;
 566                                         ocount = 0;
 567                                 }
 568                         }
 569                 } else
 570 #endif
 571                 {
 572                         if (write_and_stats(ibuf, n, obs, outfile))
 573                                 goto out_status;
 574                 }
 575         }
 576
 577         if (G.flags & FLAG_FSYNC) {
 578                 if (fsync(ofd) < 0)
 579                         goto die_outfile;
 580         }
 581
 582 #if ENABLE_FEATURE_DD_IBS_OBS
 583         if (ocount != 0) {
 584                 if (write_and_stats(obuf, ocount, obs, outfile))
 585                         goto out_status;
 586         }
 587 #endif
 588         if (close(ifd) < 0) {
 589  die_infile:
 590                 bb_simple_perror_msg_and_die(infile);
 591         }
 592
 593         if (close(ofd) < 0) {
 594  die_outfile:
 595                 bb_simple_perror_msg_and_die(outfile);
 596         }
 597
 598         exitcode = EXIT_SUCCESS;
 599  out_status:
 600         if (!ENABLE_FEATURE_DD_STATUS || !(G.flags & FLAG_STATUS_NONE))
 601                 dd_output_status(0);
 602
 603         if (ENABLE_FEATURE_CLEAN_UP) {
 604                 free(obuf);
 605                 if (G.flags & FLAG_TWOBUFS)
 606                         free(ibuf);
 607         }
 608
 609         return exitcode;
 610 }