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-rw-r--r--coreutils/dd.c128
1 files changed, 65 insertions, 63 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 052cd2902..a9536a584 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -9,6 +9,7 @@
*/
#include "busybox.h"
+#include <signal.h> /* For FEATURE_DD_SIGNAL_HANDLING */
static const struct suffix_mult dd_suffixes[] = {
{ "c", 1 },
@@ -23,72 +24,72 @@ static const struct suffix_mult dd_suffixes[] = {
{ NULL, 0 }
};
-static size_t out_full;
-static size_t out_part;
-static size_t in_full;
-static size_t in_part;
+static size_t out_full, out_part, in_full, in_part;
-static void dd_output_status(int cur_signal)
+static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
{
- fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
+ bb_fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
(long)in_full, (long)in_part,
(long)out_full, (long)out_part);
}
int dd_main(int argc, char **argv)
{
+#define sync_flag (1<<0)
+#define noerror (1<<1)
+#define trunc_flag (1<<2)
+#define twobufs_flag (1<<3)
+ int flags = trunc_flag;
size_t count = -1, oc = 0, ibs = 512, obs = 512;
ssize_t n;
off_t seek = 0, skip = 0;
- int sync_flag = FALSE, noerror = FALSE, trunc_flag = TRUE, twobufs_flag = 0,
- oflag, ifd, ofd, i;
+ int oflag, ifd, ofd;
const char *infile = NULL, *outfile = NULL;
char *ibuf, *obuf;
- if (ENABLE_FEATURE_DD_SIGNAL_HANDLING)
- {
+ if (ENABLE_FEATURE_DD_SIGNAL_HANDLING) {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
- sa.sa_handler = dd_output_status;
+ sa.sa_handler = dd_output_status;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
- sigaction(SIGUSR1, &sa, 0);
+ sigaction(SIGUSR1, &sa, 0);
}
- for (i = 1; i < argc; i++) {
- 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))
- seek = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (!strncmp("skip=", argv[i], 5))
- skip = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (!strncmp("if=", argv[i], 3))
- infile = argv[i]+3;
- else if (!strncmp("of=", argv[i], 3))
- outfile = argv[i]+3;
- else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[i], 5)) {
- ibuf = argv[i]+5;
+ for (n = 1; n < argc; n++) {
+ if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[n], 4)) {
+ ibs = bb_xparse_number(argv[n]+4, dd_suffixes);
+ flags |= twobufs_flag;
+ } else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[n], 4)) {
+ obs = bb_xparse_number(argv[n]+4, dd_suffixes);
+ flags |= twobufs_flag;
+ } else if (!strncmp("bs=", argv[n], 3))
+ ibs = obs = bb_xparse_number(argv[n]+3, dd_suffixes);
+ else if (!strncmp("count=", argv[n], 6))
+ count = bb_xparse_number(argv[n]+6, dd_suffixes);
+ else if (!strncmp("seek=", argv[n], 5))
+ seek = bb_xparse_number(argv[n]+5, dd_suffixes);
+ else if (!strncmp("skip=", argv[n], 5))
+ skip = bb_xparse_number(argv[n]+5, dd_suffixes);
+ else if (!strncmp("if=", argv[n], 3))
+ infile = argv[n]+3;
+ else if (!strncmp("of=", argv[n], 3))
+ outfile = argv[n]+3;
+ else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[n], 5)) {
+ ibuf = argv[n]+5;
while (1) {
if (!strncmp("notrunc", ibuf, 7)) {
- trunc_flag = FALSE;
+ flags ^= trunc_flag;
ibuf += 7;
} else if (!strncmp("sync", ibuf, 4)) {
- sync_flag = TRUE;
+ flags |= sync_flag;
ibuf += 4;
} else if (!strncmp("noerror", ibuf, 7)) {
- noerror = TRUE;
+ flags |= noerror;
ibuf += 7;
} else {
- bb_error_msg_and_die(bb_msg_invalid_arg, argv[i]+5, "conv");
+ bb_error_msg_and_die(bb_msg_invalid_arg, argv[n]+5, "conv");
}
if (ibuf[0] == '\0') break;
if (ibuf[0] == ',') ibuf++;
@@ -98,12 +99,14 @@ int dd_main(int argc, char **argv)
}
ibuf = xmalloc(ibs);
- if (twobufs_flag) obuf = xmalloc(obs);
- else obuf = ibuf;
+ if (flags & twobufs_flag)
+ obuf = xmalloc(obs);
+ else
+ obuf = ibuf;
- if (infile != NULL) {
+ if (infile != NULL)
ifd = xopen(infile, O_RDONLY);
- } else {
+ else {
ifd = STDIN_FILENO;
infile = bb_msg_standard_input;
}
@@ -111,20 +114,18 @@ int dd_main(int argc, char **argv)
if (outfile != NULL) {
oflag = O_WRONLY | O_CREAT;
- if (!seek && trunc_flag) {
+ if (!seek && (flags & trunc_flag))
oflag |= O_TRUNC;
- }
ofd = xopen3(outfile, oflag, 0666);
- if (seek && trunc_flag) {
+ if (seek && (flags & trunc_flag)) {
if (ftruncate(ofd, seek * obs) < 0) {
struct stat st;
- if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
- S_ISDIR (st.st_mode)) {
- bb_perror_msg_and_die("%s", outfile);
- }
+ if (fstat(ofd, &st) < 0 || S_ISREG(st.st_mode) ||
+ S_ISDIR(st.st_mode))
+ goto die_outfile;
}
}
} else {
@@ -145,44 +146,42 @@ int dd_main(int argc, char **argv)
}
if (seek) {
- if (lseek(ofd, seek * obs, SEEK_CUR) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
+ goto die_outfile;
}
while (in_full + in_part != count) {
- if (noerror) {
+ if (flags & noerror) {
/* Pre-zero the buffer when doing the noerror thing */
memset(ibuf, '\0', ibs);
}
n = safe_read(ifd, ibuf, ibs);
- if (n == 0) {
+ if (n == 0)
break;
- }
if (n < 0) {
- if (noerror) {
+ if (flags & noerror) {
n = ibs;
bb_perror_msg("%s", infile);
- } else {
+ } else
bb_perror_msg_and_die("%s", infile);
- }
}
- if ((size_t)n == ibs) {
+ if ((size_t)n == ibs)
in_full++;
- } else {
+ else {
in_part++;
if (sync_flag) {
memset(ibuf + n, '\0', ibs - n);
n = ibs;
}
}
- if (twobufs_flag) {
+ if (flags & twobufs_flag) {
char *tmp = ibuf;
while (n) {
size_t d = obs - oc;
- if (d > n) d = n;
+ if (d > n)
+ d = n;
memcpy(obuf + oc, tmp, d);
n -= d;
tmp += d;
@@ -195,8 +194,10 @@ int dd_main(int argc, char **argv)
}
} else {
xwrite(ofd, ibuf, n);
- if (n == ibs) out_full++;
- else out_part++;
+ if (n == ibs)
+ out_full++;
+ else
+ out_part++;
}
}
@@ -209,6 +210,7 @@ int dd_main(int argc, char **argv)
}
if (close (ofd) < 0) {
+die_outfile:
bb_perror_msg_and_die("%s", outfile);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-22 12:18:59 +0000