/*
* Mini dd implementation for busybox
*
- *
* Copyright (C) 2000,2001 Matt Kraai
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
//config:config DD
-//config: bool "dd"
+//config: bool "dd (7.5 kb)"
//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: 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: 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: $ dd if=/dev/zero of=/dev/null &
+//config: $ pid=$!; kill -USR1 $pid; sleep 1; kill $pid
+//config: 10899206+0 records in
+//config: 10899206+0 records out
//config:
//config:config FEATURE_DD_THIRD_STATUS_LINE
//config: bool "Enable the third status line upon signal"
//config: default y
//config: depends on DD && FEATURE_DD_SIGNAL_HANDLING
//config: help
-//config: Displays a coreutils-like third status line with transferred bytes,
-//config: elapsed time and speed.
+//config: Displays a coreutils-like third status line with transferred bytes,
+//config: elapsed time and speed.
//config:
//config:config FEATURE_DD_IBS_OBS
-//config: bool "Enable ibs, obs and conv options"
+//config: bool "Enable ibs, obs, iflag, oflag and conv options"
//config: default y
//config: depends on DD
//config: help
-//config: Enables support for writing a certain number of bytes in and out,
-//config: at a time, and performing conversions on the data stream.
+//config: Enable support for writing a certain number of bytes in and out,
+//config: at a time, and performing conversions on the data stream.
//config:
//config:config FEATURE_DD_STATUS
//config: bool "Enable status display options"
//config: default y
//config: depends on DD
//config: help
-//config: Enables support for status=noxfer/none option.
+//config: Enable support for status=noxfer/none option.
+
+//applet:IF_DD(APPLET_NOEXEC(dd, dd, BB_DIR_BIN, BB_SUID_DROP, dd))
+
+//kbuild:lib-$(CONFIG_DD) += dd.o
//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: "[if=FILE] [of=FILE] [" IF_FEATURE_DD_IBS_OBS("ibs=N obs=N/") "bs=N] [count=N] [skip=N] [seek=N]\n"
+//usage: IF_FEATURE_DD_IBS_OBS(
+//usage: " [conv=notrunc|noerror|sync|fsync]\n"
+//usage: " [iflag=skip_bytes|fullblock] [oflag=seek_bytes|append]"
+//usage: )
//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: "\n iflag=fullblock Read full blocks"
+//usage: "\n oflag=seek_bytes seek=N is in bytes"
+//usage: "\n oflag=append Open output file in append mode"
//usage: )
//usage: IF_FEATURE_DD_STATUS(
//usage: "\n status=noxfer Suppress rate output"
//usage: "4+0 records out\n"
#include "libbb.h"
+#include "common_bufsiz.h"
/* This is a NOEXEC applet. Be very careful! */
#endif
int flags;
} FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
+ setup_common_bufsiz(); \
/* we have to zero it out because of NOEXEC */ \
memset(&G, 0, sizeof(G)); \
} while (0)
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,
- FLAG_STATUS = 1 << 7,
- FLAG_STATUS_NONE = 1 << 7,
- FLAG_STATUS_NOXFER = 1 << 8,
+ /* start of input flags */
+ FLAG_IFLAG_SHIFT = 5,
+ FLAG_SKIP_BYTES = (1 << 5) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_FULLBLOCK = (1 << 6) * ENABLE_FEATURE_DD_IBS_OBS,
+ /* end of input flags */
+ /* start of output flags */
+ FLAG_OFLAG_SHIFT = 7,
+ FLAG_SEEK_BYTES = (1 << 7) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_APPEND = (1 << 8) * ENABLE_FEATURE_DD_IBS_OBS,
+ /* end of output flags */
+ FLAG_TWOBUFS = (1 << 9) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_COUNT = 1 << 10,
+ FLAG_STATUS_NONE = 1 << 11,
+ FLAG_STATUS_NOXFER = 1 << 12,
};
static void dd_output_status(int UNUSED_PARAM cur_signal)
#endif
}
-static ssize_t full_write_or_warn(const void *buf, size_t len,
- const char *const filename)
-{
- ssize_t n = full_write(ofd, buf, len);
- if (n < 0)
- bb_perror_msg("writing '%s'", filename);
- return n;
-}
-
static bool write_and_stats(const void *buf, size_t len, size_t obs,
const char *filename)
{
- ssize_t n = full_write_or_warn(buf, len, filename);
- if (n < 0)
- return 1;
- if ((size_t)n == obs)
- G.out_full++;
- else if (n) /* > 0 */
- G.out_part++;
+ ssize_t n;
+
+ n = full_write(ofd, buf, len);
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
- G.total_bytes += n;
+ if (n > 0)
+ G.total_bytes += n;
#endif
- return 0;
+ if ((size_t)n == obs) {
+ G.out_full++;
+ return 0;
+ }
+ if ((size_t)n == len) {
+ G.out_part++;
+ return 0;
+ }
+ /* n is < len (and possibly is -1).
+ * Even if n >= 0, errno is usually set correctly.
+ * For example, if writing to block device and getting ENOSPC,
+ * full_write() first sees a short write, then tries to write
+ * the remainder and gets errno set to ENOSPC.
+ * It returns n > 0 (the amount which it did write).
+ */
+ bb_perror_msg("error writing '%s'", filename);
+ return 1;
}
#if ENABLE_LFS
# 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)
{
static const char keywords[] ALIGN1 =
"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""oflag\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""fullblock\0";
+ static const char oflag_words[] ALIGN1 =
+ "seek_bytes\0append\0";
#endif
#if ENABLE_FEATURE_DD_STATUS
static const char status_words[] ALIGN1 =
OP_ibs,
OP_obs,
OP_conv,
+ OP_iflag,
+ OP_oflag,
/* 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,
+ OP_iflag_fullblock,
+ OP_oflag_seek_bytes,
#endif
};
smallint exitcode = EXIT_FAILURE;
#endif
/* These are all zeroed at once! */
struct {
- size_t oc;
+ IF_FEATURE_DD_IBS_OBS(size_t ocount;)
ssize_t prev_read_size; /* for detecting swab failure */
off_t count;
off_t seek, skip;
const char *infile, *outfile;
} Z;
-#define oc (Z.oc )
+#define ocount (Z.ocount )
#define prev_read_size (Z.prev_read_size)
#define count (Z.count )
#define seek (Z.seek )
/*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");
- G.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;*/
+ }
+ if (what == OP_oflag) {
+ G.flags |= parse_comma_flags(val, oflag_words, "oflag") << FLAG_OFLAG_SHIFT;
/*continue;*/
}
#endif
int n;
n = index_in_strings(status_words, val);
if (n < 0)
- bb_error_msg_and_die(bb_msg_invalid_arg, val, "status");
- G.flags |= FLAG_STATUS << n;
+ bb_error_msg_and_die(bb_msg_invalid_arg_to, val, "status");
+ G.flags |= FLAG_STATUS_NONE << n;
/*continue;*/
}
#endif
if (!seek && !(G.flags & FLAG_NOTRUNC))
oflag |= O_TRUNC;
+ if (G.flags & FLAG_APPEND)
+ oflag |= O_APPEND;
xmove_fd(xopen(outfile, oflag), ofd);
if (seek && !(G.flags & FLAG_NOTRUNC)) {
- if (ftruncate(ofd, seek * obs) < 0) {
+ size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
+ if (ftruncate(ofd, seek * blocksz) < 0) {
struct stat st;
if (fstat(ofd, &st) < 0
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;
+#if ENABLE_FEATURE_DD_IBS_OBS
+ if (G.flags & FLAG_FULLBLOCK)
+ n = full_read(ifd, ibuf, blocksz);
+ else
+#endif
+ n = safe_read(ifd, ibuf, blocksz);
if (n < 0)
goto die_infile;
if (n == 0)
}
}
if (seek) {
- if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
+ size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
+ if (lseek(ofd, seek * blocksz, SEEK_CUR) < 0)
goto die_outfile;
}
while (!(G.flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
ssize_t n;
-
- n = safe_read(ifd, ibuf, ibs);
+#if ENABLE_FEATURE_DD_IBS_OBS
+ if (G.flags & FLAG_FULLBLOCK)
+ n = full_read(ifd, ibuf, ibs);
+ else
+#endif
+ n = safe_read(ifd, ibuf, ibs);
if (n == 0)
break;
if (n < 0) {
n = ibs;
}
}
+#if ENABLE_FEATURE_DD_IBS_OBS
if (G.flags & FLAG_TWOBUFS) {
char *tmp = ibuf;
while (n) {
- size_t d = obs - oc;
-
+ size_t d = obs - ocount;
if (d > (size_t)n)
d = n;
- memcpy(obuf + oc, tmp, d);
+ memcpy(obuf + ocount, tmp, d);
n -= d;
tmp += d;
- oc += d;
- if (oc == obs) {
+ ocount += d;
+ if (ocount == obs) {
if (write_and_stats(obuf, obs, obs, outfile))
goto out_status;
- oc = 0;
+ ocount = 0;
}
}
- } else {
+ } else
+#endif
+ {
if (write_and_stats(ibuf, n, obs, outfile))
goto out_status;
}
+ }
- if (G.flags & FLAG_FSYNC) {
- if (fsync(ofd) < 0)
- goto die_outfile;
- }
+ if (G.flags & FLAG_FSYNC) {
+ if (fsync(ofd) < 0)
+ goto die_outfile;
}
- if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
- if (write_and_stats(obuf, oc, obs, outfile))
+#if ENABLE_FEATURE_DD_IBS_OBS
+ if (ocount != 0) {
+ if (write_and_stats(obuf, ocount, obs, outfile))
goto out_status;
}
+#endif
if (close(ifd) < 0) {
die_infile:
bb_simple_perror_msg_and_die(infile);
projects / oweals / busybox.git / blobdiff