$ dd if=/dev/zero of=/dev/null& pid=$! $ kill -USR1 $pid; sleep 1; kill $pid
10899206+0 records in 10899206+0 records out
+config CONFIG_FEATURE_DD_IBS_OBS
+ bool "Enable ibs, obs and conv options"
+ default n
+ depends on CONFIG_DD
+ help
+ Enables support for writing a certain number of bytes in and out,
+ at a time, and performing conversions on the data stream.
+
config CONFIG_DF
bool "df"
default n
int dd_main(int argc, char **argv)
{
- size_t count = -1;
- size_t bs = 512;
+ size_t count = -1, oc = 0, ibs = 512, obs = 512;
ssize_t n;
- off_t seek = 0;
- off_t skip = 0;
- int sync_flag = FALSE;
- int noerror = FALSE;
- int trunc_flag = TRUE;
- int oflag;
- int ifd;
- int ofd;
- int i;
- const char *infile = NULL;
- const char *outfile = NULL;
- char *buf;
+ off_t seek = 0, skip = 0;
+ int sync_flag = FALSE, noerror = FALSE, trunc_flag = TRUE, twobufs_flag = 0,
+ oflag, ifd, ofd, i;
+ const char *infile = NULL, *outfile = NULL;
+ char *ibuf, *obuf;
if (ENABLE_FEATURE_DD_SIGNAL_HANDLING)
{
}
for (i = 1; i < argc; i++) {
- if (strncmp("bs=", argv[i], 3) == 0)
- bs = bb_xparse_number(argv[i]+3, dd_suffixes);
- else if (strncmp("count=", argv[i], 6) == 0)
+ if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[i], 4)) {
+ ibs = bb_xparse_number(argv[i]+4, dd_suffixes);
+ twobufs_flag++;
+ } else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[i], 4)) {
+ obs = bb_xparse_number(argv[i]+4, dd_suffixes);
+ twobufs_flag++;
+ } else if (!strncmp("bs=", argv[i], 3)) {
+ ibs = obs = bb_xparse_number(argv[i]+3, dd_suffixes);
+ } else if (!strncmp("count=", argv[i], 6))
count = bb_xparse_number(argv[i]+6, dd_suffixes);
- else if (strncmp("seek=", argv[i], 5) == 0)
+ else if (!strncmp("seek=", argv[i], 5))
seek = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (strncmp("skip=", argv[i], 5) == 0)
+ else if (!strncmp("skip=", argv[i], 5))
skip = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (strncmp("if=", argv[i], 3) == 0)
+ else if (!strncmp("if=", argv[i], 3))
infile = argv[i]+3;
- else if (strncmp("of=", argv[i], 3) == 0)
+ else if (!strncmp("of=", argv[i], 3))
outfile = argv[i]+3;
- else if (strncmp("conv=", argv[i], 5) == 0) {
- buf = argv[i]+5;
+ else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[i], 5)) {
+ ibuf = argv[i]+5;
while (1) {
- if (strncmp("notrunc", buf, 7) == 0) {
+ if (!strncmp("notrunc", ibuf, 7)) {
trunc_flag = FALSE;
- buf += 7;
- } else if (strncmp("sync", buf, 4) == 0) {
+ ibuf += 7;
+ } else if (!strncmp("sync", ibuf, 4)) {
sync_flag = TRUE;
- buf += 4;
- } else if (strncmp("noerror", buf, 7) == 0) {
+ ibuf += 4;
+ } else if (!strncmp("noerror", ibuf, 7)) {
noerror = TRUE;
- buf += 7;
+ ibuf += 7;
} else {
bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5);
}
- if (buf[0] == '\0')
- break;
- if (buf[0] == ',')
- buf++;
+ if (ibuf[0] == '\0') break;
+ if (ibuf[0] == ',') ibuf++;
}
} else
bb_show_usage();
}
+ ibuf = xmalloc(ibs);
- buf = xmalloc(bs);
+ if (twobufs_flag) obuf = xmalloc(obs);
+ else obuf = ibuf;
if (infile != NULL) {
ifd = bb_xopen(infile, O_RDONLY);
ofd = bb_xopen3(outfile, oflag, 0666);
if (seek && trunc_flag) {
- if (ftruncate(ofd, seek * bs) < 0) {
+ if (ftruncate(ofd, seek * obs) < 0) {
struct stat st;
if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
}
if (skip) {
- if (lseek(ifd, skip * bs, SEEK_CUR) < 0) {
- bb_perror_msg_and_die("%s", infile);
+ if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
+ while (skip-- > 0) {
+ n = safe_read(ifd, ibuf, ibs);
+ if (n < 0)
+ bb_perror_msg_and_die("%s", infile);
+ if (n == 0)
+ break;
+ }
}
}
if (seek) {
- if (lseek(ofd, seek * bs, SEEK_CUR) < 0) {
+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0) {
bb_perror_msg_and_die("%s", outfile);
}
}
while (in_full + in_part != count) {
if (noerror) {
/* Pre-zero the buffer when doing the noerror thing */
- memset(buf, '\0', bs);
+ memset(ibuf, '\0', ibs);
+ }
+
+ n = safe_read(ifd, ibuf, ibs);
+ if (n == 0) {
+ break;
}
- n = safe_read(ifd, buf, bs);
if (n < 0) {
if (noerror) {
- n = bs;
+ n = ibs;
bb_perror_msg("%s", infile);
} else {
bb_perror_msg_and_die("%s", infile);
}
}
- if (n == 0) {
- break;
- }
- if ((size_t)n == bs) {
+ if ((size_t)n == ibs) {
in_full++;
} else {
in_part++;
+ if (sync_flag) {
+ memset(ibuf + n, '\0', ibs - n);
+ n = ibs;
+ }
}
- if (sync_flag) {
- memset(buf + n, '\0', bs - n);
- n = bs;
+ if (twobufs_flag) {
+ char *tmp = ibuf;
+ while (n) {
+ size_t d = obs - oc;
+
+ if (d > n) d = n;
+ memcpy(obuf + oc, tmp, d);
+ n -= d;
+ tmp += d;
+ oc += d;
+ if (oc == obs) {
+ if (bb_full_write(ofd, obuf, obs) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ out_full++;
+ oc = 0;
+ }
+ }
+ } else {
+ if ((n = bb_full_write(ofd, ibuf, n)) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ if (n == ibs) out_full++;
+ else out_part++;
}
- n = bb_full_write(ofd, buf, n);
- if (n < 0) {
+ }
+
+ if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
+ if (bb_full_write(ofd, obuf, oc) < 0) {
bb_perror_msg_and_die("%s", outfile);
}
- if ((size_t)n == bs) {
- out_full++;
- } else {
- out_part++;
- }
+ out_part++;
}
-
if (close (ifd) < 0) {
bb_perror_msg_and_die("%s", infile);
}
"64\n"
#define dd_trivial_usage \
- "[if=FILE] [of=FILE] [bs=N] [count=N] [skip=N]\n" \
- "\t [seek=N] [conv=notrunc|noerror|sync]"
+ "[if=FILE] [of=FILE] " USE_FEATURE_DD_IBS_OBS("[ibs=N] [obs=N] ") "[bs=N] [count=N] [skip=N]\n" \
+ "\t [seek=N]" USE_FEATURE_DD_IBS_OBS(" [conv=notrunc|noerror|sync]")
#define dd_full_usage \
"Copy a file, converting and formatting according to options\n\n" \
"\tif=FILE\t\tread from FILE instead of stdin\n" \
"\tof=FILE\t\twrite to FILE instead of stdout\n" \
"\tbs=N\t\tread and write N bytes at a time\n" \
+ USE_FEATURE_DD_IBS_OBS("\tibs=N\t\tread N bytes at a time\n") \
+ USE_FEATURE_DD_IBS_OBS("\tobs=N\t\twrite N bytes at a time\n") \
"\tcount=N\t\tcopy only N input blocks\n" \
"\tskip=N\t\tskip N input blocks\n" \
"\tseek=N\t\tskip N output blocks\n" \
- "\tconv=notrunc\tdon't truncate output file\n" \
- "\tconv=noerror\tcontinue after read errors\n" \
- "\tconv=sync\tpad blocks with zeros\n" \
+ USE_FEATURE_DD_IBS_OBS( \
+ "\tconv=notrunc\tdon't truncate output file\n" \
+ "\tconv=noerror\tcontinue after read errors\n" \
+ "\tconv=sync\tpad blocks with zeros\n" \
+ ) \
"\n" \
"Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024),\n" \
"MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824)"
+++ /dev/null
-This patch adds support of ibs= and obs= to dd.
-----
-Hideki IWAMOTO h-iwamoto@kit.hi-ho.ne.jp
-
-
---- a/include/usage.h 29 Mar 2004 08:20:08 -0000 1.198
-+++ b/include/usage.h 4 Apr 2004 07:15:21 -0000
-@@ -309,13 +309,15 @@
- "64\n"
-
- #define dd_trivial_usage \
-- "[if=FILE] [of=FILE] [bs=N] [count=N] [skip=N]\n" \
-- "\t [seek=N] [conv=notrunc|noerror|sync]"
-+ "[if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N]\n" \
-+ "\t [skip=N] [seek=N] [conv=notrunc|noerror|sync]"
- #define dd_full_usage \
- "Copy a file, converting and formatting according to options\n\n" \
- "\tif=FILE\t\tread from FILE instead of stdin\n" \
- "\tof=FILE\t\twrite to FILE instead of stdout\n" \
-- "\tbs=N\t\tread and write N bytes at a time\n" \
-+ "\tibs=N\t\tread N bytes at a time\n" \
-+ "\tobs=N\t\twrite N bytes at a time\n" \
-+ "\tbs=N\t\tforce ibs=N and obs=N\n" \
- "\tcount=N\t\tcopy only N input blocks\n" \
- "\tskip=N\t\tskip N input blocks\n" \
- "\tseek=N\t\tskip N output blocks\n" \
-@@ -323,6 +325,8 @@
- "\tconv=noerror\tcontinue after read errors\n" \
- "\tconv=sync\tpad blocks with zeros\n" \
- "\n" \
-+ "If the bs= expr operand is not specified, the input is processed and collected\n" \
-+ "into full-sized output blocks until the end of the input is reached.\n" \
- "Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024),\n" \
- "MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824)."
- #define dd_example_usage \
---- a/coreutils/dd.c 30 Jan 2004 22:24:32 -0000 1.55
-+++ b/coreutils/dd.c 4 Apr 2004 07:15:21 -0000
-@@ -30,6 +30,10 @@
- #include <fcntl.h>
- #include "busybox.h"
-
-+#define C_NOERROR 0x0001
-+#define C_TRUNC 0x0002
-+#define C_SYNC 0x0004
-+#define C_TWOBUFS 0x0008
-
- static const struct suffix_mult dd_suffixes[] = {
- { "c", 1 },
-@@ -51,13 +55,13 @@
- size_t in_full = 0;
- size_t in_part = 0;
- size_t count = -1;
-- size_t bs = 512;
-+ size_t ibs = 512;
-+ size_t obs = 512;
-+ size_t oc = 0;
- ssize_t n;
- off_t seek = 0;
- off_t skip = 0;
-- int sync_flag = FALSE;
-- int noerror = FALSE;
-- int trunc_flag = TRUE;
-+ unsigned int dd_flags = C_TWOBUFS | C_TRUNC;
- int oflag;
- int ifd;
- int ofd;
-@@ -65,11 +69,18 @@
- const char *infile = NULL;
- const char *outfile = NULL;
- char *buf;
-+ char *ibuf;
-+ char *obuf;
-
- for (i = 1; i < argc; i++) {
-- if (strncmp("bs=", argv[i], 3) == 0)
-- bs = bb_xparse_number(argv[i]+3, dd_suffixes);
-- else if (strncmp("count=", argv[i], 6) == 0)
-+ if (strncmp("ibs=", argv[i], 4) == 0)
-+ ibs = bb_xparse_number(argv[i]+4, dd_suffixes);
-+ else if (strncmp("obs=", argv[i], 4) == 0)
-+ obs = bb_xparse_number(argv[i]+4, dd_suffixes);
-+ else if (strncmp("bs=", argv[i], 3) == 0) {
-+ ibs = obs = bb_xparse_number(argv[i]+3, dd_suffixes);
-+ dd_flags &= ~C_TWOBUFS;
-+ } else if (strncmp("count=", argv[i], 6) == 0)
- count = bb_xparse_number(argv[i]+6, dd_suffixes);
- else if (strncmp("seek=", argv[i], 5) == 0)
- seek = bb_xparse_number(argv[i]+5, dd_suffixes);
-@@ -83,13 +94,13 @@
- buf = argv[i]+5;
- while (1) {
- if (strncmp("notrunc", buf, 7) == 0) {
-- trunc_flag = FALSE;
-+ dd_flags &= ~C_TRUNC;
- buf += 7;
- } else if (strncmp("sync", buf, 4) == 0) {
-- sync_flag = TRUE;
-+ dd_flags |= C_SYNC;
- buf += 4;
- } else if (strncmp("noerror", buf, 7) == 0) {
-- noerror = TRUE;
-+ dd_flags |= C_NOERROR;
- buf += 7;
- } else {
- bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5);
-@@ -103,7 +114,12 @@
- bb_show_usage();
- }
-
-- buf = xmalloc(bs);
-+ ibuf = xmalloc(ibs);
-+
-+ if (dd_flags & C_TWOBUFS)
-+ obuf = xmalloc(obs);
-+ else
-+ obuf = ibuf;
-
- if (infile != NULL) {
- ifd = bb_xopen(infile, O_RDONLY);
-@@ -115,7 +131,7 @@
- if (outfile != NULL) {
- oflag = O_WRONLY | O_CREAT;
-
-- if (!seek && trunc_flag) {
-+ if (!seek && (dd_flags & C_TRUNC)) {
- oflag |= O_TRUNC;
- }
-
-@@ -123,8 +139,8 @@
- bb_perror_msg_and_die("%s", outfile);
- }
-
-- if (seek && trunc_flag) {
-- if (ftruncate(ofd, seek * bs) < 0) {
-+ if (seek && (dd_flags & C_TRUNC)) {
-+ if (ftruncate(ofd, seek * obs) < 0) {
- struct stat st;
-
- if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
-@@ -139,52 +155,88 @@
- }
-
- if (skip) {
-- if (lseek(ifd, skip * bs, SEEK_CUR) < 0) {
-- bb_perror_msg_and_die("%s", infile);
-+ if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
-+ while (skip-- > 0) {
-+ n = safe_read(ifd, ibuf, ibs);
-+ if (n < 0)
-+ bb_perror_msg_and_die("%s", infile);
-+ if (n == 0)
-+ break;
-+ }
- }
- }
-
- if (seek) {
-- if (lseek(ofd, seek * bs, SEEK_CUR) < 0) {
-+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
- }
-
- while (in_full + in_part != count) {
-- if (noerror) {
-+ if (dd_flags & C_NOERROR) {
- /* Pre-zero the buffer when doing the noerror thing */
-- memset(buf, '\0', bs);
-+ memset(ibuf, '\0', ibs);
-+ }
-+
-+ n = safe_read(ifd, ibuf, ibs);
-+ if (n == 0) {
-+ break;
- }
-- n = safe_read(ifd, buf, bs);
- if (n < 0) {
-- if (noerror) {
-- n = bs;
-+ if (dd_flags & C_NOERROR) {
-+ n = ibs;
- bb_perror_msg("%s", infile);
- } else {
- bb_perror_msg_and_die("%s", infile);
- }
- }
-- if (n == 0) {
-- break;
-- }
-- if (n == bs) {
-+ if (n == ibs) {
- in_full++;
- } else {
- in_part++;
-+ if (dd_flags & C_SYNC) {
-+ memset(ibuf + n, '\0', ibs - n);
-+ n = ibs;
-+ }
- }
-- if (sync_flag) {
-- memset(buf + n, '\0', bs - n);
-- n = bs;
-+
-+ if (dd_flags & C_TWOBUFS) {
-+ size_t d;
-+ char *tmp = ibuf;
-+
-+ while (n) {
-+ d = obs - oc;
-+ if (d > n)
-+ d = n;
-+ memcpy(obuf + oc, tmp, d);
-+ n -= d;
-+ tmp += d;
-+ oc += d;
-+ if (oc == obs) {
-+ if (bb_full_write(ofd, obuf, obs) < 0) {
-+ bb_perror_msg_and_die("%s", outfile);
-+ }
-+ out_full++;
-+ oc = 0;
-+ }
-+ }
-+ } else {
-+ if (bb_full_write(ofd, ibuf, n) < 0) {
-+ bb_perror_msg_and_die("%s", outfile);
-+ }
-+ if (n == ibs) {
-+ out_full++;
-+ } else {
-+ out_part++;
-+ }
- }
-- n = bb_full_write(ofd, buf, n);
-- if (n < 0) {
-+ }
-+
-+ if (oc) {
-+ if (bb_full_write(ofd, obuf, oc) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
-- if (n == bs) {
-- out_full++;
-- } else {
-- out_part++;
-- }
-+ out_part++;
- }
-
- if (close (ifd) < 0) {
-
-
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