* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config DD
+//config: bool "dd"
+//config: default y
+//config: help
+//config: dd copies a file (from standard input to standard output,
+//config: by default) using specific input and output blocksizes,
+//config: while optionally performing conversions on it.
+//config:
+//config:config FEATURE_DD_SIGNAL_HANDLING
+//config: bool "Enable signal handling for status reporting"
+//config: default y
+//config: depends on DD
+//config: help
+//config: Sending a SIGUSR1 signal to a running `dd' process makes it
+//config: print to standard error the number of records read and written
+//config: so far, then to resume copying.
+//config:
+//config: $ dd if=/dev/zero of=/dev/null &
+//config: $ pid=$!; kill -USR1 $pid; sleep 1; kill $pid
+//config: 10899206+0 records in
+//config: 10899206+0 records out
+//config:
+//config:config FEATURE_DD_THIRD_STATUS_LINE
+//config: bool "Enable the third status line upon signal"
+//config: default y
+//config: depends on DD && FEATURE_DD_SIGNAL_HANDLING
+//config: help
+//config: Displays a coreutils-like third status line with transferred bytes,
+//config: elapsed time and speed.
+//config:
+//config:config FEATURE_DD_IBS_OBS
+//config: bool "Enable ibs, obs and conv options"
+//config: default y
+//config: depends on DD
+//config: help
+//config: Enables support for writing a certain number of bytes in and out,
+//config: at a time, and performing conversions on the data stream.
+//config:
+//config:config FEATURE_DD_STATUS
+//config: bool "Enable status display options"
+//config: default y
+//config: depends on DD
+//config: help
+//config: Enables support for status=noxfer/none option.
+
//usage:#define dd_trivial_usage
//usage: "[if=FILE] [of=FILE] " IF_FEATURE_DD_IBS_OBS("[ibs=N] [obs=N] ") "[bs=N] [count=N] [skip=N]\n"
-//usage: " [seek=N]" IF_FEATURE_DD_IBS_OBS(" [conv=notrunc|noerror|sync|fsync]")
+//usage: " [seek=N]" IF_FEATURE_DD_IBS_OBS(" [conv=notrunc|noerror|sync|fsync] [iflag=skip_bytes]")
//usage:#define dd_full_usage "\n\n"
//usage: "Copy a file with converting and formatting\n"
//usage: "\n if=FILE Read from FILE instead of stdin"
//usage: "\n conv=sync Pad blocks with zeros"
//usage: "\n conv=fsync Physically write data out before finishing"
//usage: "\n conv=swab Swap every pair of bytes"
+//usage: "\n iflag=skip_bytes skip=N is in bytes"
+//usage: )
+//usage: IF_FEATURE_DD_STATUS(
+//usage: "\n status=noxfer Suppress rate output"
+//usage: "\n status=none Suppress all output"
//usage: )
//usage: "\n"
-//usage: "\nN may be suffixed by c (1), w (2), b (512), kD (1000), k (1024), MD, M, GD, G"
+//usage: "\nN may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G"
//usage:
//usage:#define dd_example_usage
//usage: "$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4\n"
ofd = STDOUT_FILENO,
};
-static const struct suffix_mult dd_suffixes[] = {
- { "c", 1 },
- { "w", 2 },
- { "b", 512 },
- { "kD", 1000 },
- { "k", 1024 },
- { "K", 1024 }, /* compat with coreutils dd */
- { "MD", 1000000 },
- { "M", 1048576 },
- { "GD", 1000000000 },
- { "G", 1073741824 },
- { "", 0 }
-};
-
struct globals {
off_t out_full, out_part, in_full, in_part;
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
unsigned long long total_bytes;
unsigned long long begin_time_us;
#endif
+ int flags;
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { \
memset(&G, 0, sizeof(G)); \
} while (0)
+enum {
+ /* Must be in the same order as OP_conv_XXX! */
+ /* (see "flags |= (1 << what)" below) */
+ FLAG_NOTRUNC = (1 << 0) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_SYNC = (1 << 1) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_NOERROR = (1 << 2) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_FSYNC = (1 << 3) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_SWAB = (1 << 4) * ENABLE_FEATURE_DD_IBS_OBS,
+ /* end of conv flags */
+ /* start of input flags */
+ FLAG_IFLAG_SHIFT = 5,
+ FLAG_SKIP_BYTES = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
+ /* end of input flags */
+ FLAG_TWOBUFS = (1 << 6) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_COUNT = 1 << 7,
+ FLAG_STATUS = 1 << 8,
+ FLAG_STATUS_NONE = 1 << 9,
+ FLAG_STATUS_NOXFER = 1 << 10,
+};
static void dd_output_status(int UNUSED_PARAM cur_signal)
{
G.out_full, G.out_part);
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
+# if ENABLE_FEATURE_DD_STATUS
+ if (G.flags & FLAG_STATUS_NOXFER) /* status=noxfer active? */
+ return;
+ //TODO: should status=none make dd stop reacting to USR1 entirely?
+ //So far we react to it (we print the stats),
+ //status=none only suppresses final, non-USR1 generated status message.
+# endif
fprintf(stderr, "%llu bytes (%sB) copied, ",
G.total_bytes,
/* show fractional digit, use suffixes */
# define XATOU_SFX xatoul_sfx
#endif
+#if ENABLE_FEATURE_DD_IBS_OBS
+static int parse_comma_flags(char *val, const char *words, const char *error_in)
+{
+ int flags = 0;
+ while (1) {
+ int n;
+ char *arg;
+ /* find ',', replace them with NUL so we can use val for
+ * index_in_strings() without copying.
+ * We rely on val being non-null, else strchr would fault.
+ */
+ arg = strchr(val, ',');
+ if (arg)
+ *arg = '\0';
+ n = index_in_strings(words, val);
+ if (n < 0)
+ bb_error_msg_and_die(bb_msg_invalid_arg_to, val, error_in);
+ flags |= (1 << n);
+ if (!arg) /* no ',' left, so this was the last specifier */
+ break;
+ *arg = ','; /* to preserve ps listing */
+ val = arg + 1; /* skip this keyword and ',' */
+ }
+ return flags;
+}
+#endif
+
int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dd_main(int argc UNUSED_PARAM, char **argv)
{
- enum {
- /* Must be in the same order as OP_conv_XXX! */
- /* (see "flags |= (1 << what)" below) */
- FLAG_NOTRUNC = (1 << 0) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_SYNC = (1 << 1) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_NOERROR = (1 << 2) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_FSYNC = (1 << 3) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_SWAB = (1 << 4) * ENABLE_FEATURE_DD_IBS_OBS,
- /* end of conv flags */
- FLAG_TWOBUFS = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_COUNT = 1 << 6,
- };
static const char keywords[] ALIGN1 =
- "bs\0""count\0""seek\0""skip\0""if\0""of\0"
+ "bs\0""count\0""seek\0""skip\0""if\0""of\0"IF_FEATURE_DD_STATUS("status\0")
#if ENABLE_FEATURE_DD_IBS_OBS
- "ibs\0""obs\0""conv\0"
+ "ibs\0""obs\0""conv\0""iflag\0"
#endif
;
#if ENABLE_FEATURE_DD_IBS_OBS
static const char conv_words[] ALIGN1 =
"notrunc\0""sync\0""noerror\0""fsync\0""swab\0";
+ static const char iflag_words[] ALIGN1 =
+ "skip_bytes\0";
+#endif
+#if ENABLE_FEATURE_DD_STATUS
+ static const char status_words[] ALIGN1 =
+ "none\0""noxfer\0";
#endif
enum {
OP_bs = 0,
OP_skip,
OP_if,
OP_of,
+ IF_FEATURE_DD_STATUS(OP_status,)
#if ENABLE_FEATURE_DD_IBS_OBS
OP_ibs,
OP_obs,
OP_conv,
+ OP_iflag,
/* Must be in the same order as FLAG_XXX! */
OP_conv_notrunc = 0,
OP_conv_sync,
//ibm from ASCII to alternate EBCDIC
/* Partially implemented: */
//swab swap every pair of input bytes: will abort on non-even reads
+ OP_iflag_skip_bytes,
#endif
};
smallint exitcode = EXIT_FAILURE;
#endif
/* These are all zeroed at once! */
struct {
- int flags;
size_t oc;
ssize_t prev_read_size; /* for detecting swab failure */
off_t count;
off_t seek, skip;
const char *infile, *outfile;
} Z;
-#define flags (Z.flags )
#define oc (Z.oc )
#define prev_read_size (Z.prev_read_size)
#define count (Z.count )
#if ENABLE_FEATURE_DD_IBS_OBS
if (what == OP_ibs) {
/* Must fit into positive ssize_t */
- ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
/*continue;*/
}
if (what == OP_obs) {
- obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
/*continue;*/
}
if (what == OP_conv) {
- while (1) {
- int n;
- /* find ',', replace them with NUL so we can use val for
- * index_in_strings() without copying.
- * We rely on val being non-null, else strchr would fault.
- */
- arg = strchr(val, ',');
- if (arg)
- *arg = '\0';
- n = index_in_strings(conv_words, val);
- if (n < 0)
- bb_error_msg_and_die(bb_msg_invalid_arg, val, "conv");
- flags |= (1 << n);
- if (!arg) /* no ',' left, so this was the last specifier */
- break;
- /* *arg = ','; - to preserve ps listing? */
- val = arg + 1; /* skip this keyword and ',' */
- }
+ G.flags |= parse_comma_flags(val, conv_words, "conv");
+ /*continue;*/
+ }
+ if (what == OP_iflag) {
+ G.flags |= parse_comma_flags(val, iflag_words, "iflag") << FLAG_IFLAG_SHIFT;
/*continue;*/
}
#endif
if (what == OP_bs) {
- ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, cwbkMG_suffixes);
obs = ibs;
/*continue;*/
}
/* These can be large: */
if (what == OP_count) {
- flags |= FLAG_COUNT;
- count = XATOU_SFX(val, dd_suffixes);
+ G.flags |= FLAG_COUNT;
+ count = XATOU_SFX(val, cwbkMG_suffixes);
/*continue;*/
}
if (what == OP_seek) {
- seek = XATOU_SFX(val, dd_suffixes);
+ seek = XATOU_SFX(val, cwbkMG_suffixes);
/*continue;*/
}
if (what == OP_skip) {
- skip = XATOU_SFX(val, dd_suffixes);
+ skip = XATOU_SFX(val, cwbkMG_suffixes);
/*continue;*/
}
if (what == OP_if) {
outfile = val;
/*continue;*/
}
+#if ENABLE_FEATURE_DD_STATUS
+ if (what == OP_status) {
+ int n;
+ n = index_in_strings(status_words, val);
+ if (n < 0)
+ bb_error_msg_and_die(bb_msg_invalid_arg_to, val, "status");
+ G.flags |= FLAG_STATUS << n;
+ /*continue;*/
+ }
+#endif
} /* end of "for (argv[i])" */
//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
obuf = ibuf;
#if ENABLE_FEATURE_DD_IBS_OBS
if (ibs != obs) {
- flags |= FLAG_TWOBUFS;
+ G.flags |= FLAG_TWOBUFS;
obuf = xmalloc(obs);
}
#endif
if (outfile) {
int oflag = O_WRONLY | O_CREAT;
- if (!seek && !(flags & FLAG_NOTRUNC))
+ if (!seek && !(G.flags & FLAG_NOTRUNC))
oflag |= O_TRUNC;
xmove_fd(xopen(outfile, oflag), ofd);
- if (seek && !(flags & FLAG_NOTRUNC)) {
+ if (seek && !(G.flags & FLAG_NOTRUNC)) {
if (ftruncate(ofd, seek * obs) < 0) {
struct stat st;
outfile = bb_msg_standard_output;
}
if (skip) {
- if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
+ size_t blocksz = (G.flags & FLAG_SKIP_BYTES) ? 1 : ibs;
+ if (lseek(ifd, skip * blocksz, SEEK_CUR) < 0) {
do {
- ssize_t n = safe_read(ifd, ibuf, ibs);
+ ssize_t n = safe_read(ifd, ibuf, blocksz);
if (n < 0)
goto die_infile;
if (n == 0)
goto die_outfile;
}
- while (!(flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
+ while (!(G.flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
ssize_t n;
n = safe_read(ifd, ibuf, ibs);
break;
if (n < 0) {
/* "Bad block" */
- if (!(flags & FLAG_NOERROR))
+ if (!(G.flags & FLAG_NOERROR))
goto die_infile;
bb_simple_perror_msg(infile);
/* GNU dd with conv=noerror skips over bad blocks */
* conv=noerror just ignores input bad blocks */
n = 0;
}
- if (flags & FLAG_SWAB) {
+ if (G.flags & FLAG_SWAB) {
uint16_t *p16;
ssize_t n2;
G.in_full++;
else {
G.in_part++;
- if (flags & FLAG_SYNC) {
+ if (G.flags & FLAG_SYNC) {
memset(ibuf + n, 0, ibs - n);
n = ibs;
}
}
- if (flags & FLAG_TWOBUFS) {
+ if (G.flags & FLAG_TWOBUFS) {
char *tmp = ibuf;
while (n) {
size_t d = obs - oc;
goto out_status;
}
- if (flags & FLAG_FSYNC) {
+ if (G.flags & FLAG_FSYNC) {
if (fsync(ofd) < 0)
goto die_outfile;
}
exitcode = EXIT_SUCCESS;
out_status:
- dd_output_status(0);
+ if (!ENABLE_FEATURE_DD_STATUS || !(G.flags & FLAG_STATUS_NONE))
+ dd_output_status(0);
if (ENABLE_FEATURE_CLEAN_UP) {
free(obuf);
- if (flags & FLAG_TWOBUFS)
+ if (G.flags & FLAG_TWOBUFS)
free(ibuf);
}
projects / oweals / busybox.git / blobdiff