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-rw-r--r--coreutils/dd.c146
1 files changed, 86 insertions, 60 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index f3330e624..e172b0c29 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -79,23 +79,31 @@ static bool write_and_stats(const void *buf, size_t len, size_t obs,
#endif
int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dd_main(int argc, char **argv)
+int dd_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
enum {
- FLAG_SYNC = 1 << 0,
- FLAG_NOERROR = 1 << 1,
- FLAG_NOTRUNC = 1 << 2,
- FLAG_TWOBUFS = 1 << 3,
- FLAG_COUNT = 1 << 4,
+ /* Must be in the same order as OP_conv_XXX! */
+ /* (see "flags |= (1 << what)" below) */
+ FLAG_NOTRUNC = 1 << 0,
+ FLAG_SYNC = 1 << 1,
+ FLAG_NOERROR = 1 << 2,
+ FLAG_FSYNC = 1 << 3,
+ /* end of conv flags */
+ FLAG_TWOBUFS = 1 << 4,
+ FLAG_COUNT = 1 << 5,
};
static const char keywords[] ALIGN1 =
"bs=\0""count=\0""seek=\0""skip=\0""if=\0""of=\0"
#if ENABLE_FEATURE_DD_IBS_OBS
- "ibs=\0""obs=\0""conv=\0""notrunc\0""sync\0""noerror\0"
+ "ibs=\0""obs=\0""conv=\0"
#endif
;
+#if ENABLE_FEATURE_DD_IBS_OBS
+ static const char conv_words[] ALIGN1 =
+ "notrunc\0""sync\0""noerror\0""fsync\0";
+#endif
enum {
- OP_bs = 1,
+ OP_bs = 0,
OP_count,
OP_seek,
OP_skip,
@@ -105,9 +113,23 @@ int dd_main(int argc, char **argv)
OP_ibs,
OP_obs,
OP_conv,
- OP_conv_notrunc,
+ /* Must be in the same order as FLAG_XXX! */
+ OP_conv_notrunc = 0,
OP_conv_sync,
OP_conv_noerror,
+ OP_conv_fsync,
+ /* Unimplemented conv=XXX: */
+ //nocreat do not create the output file
+ //excl fail if the output file already exists
+ //fdatasync physically write output file data before finishing
+ //swab swap every pair of input bytes
+ //lcase change upper case to lower case
+ //ucase change lower case to upper case
+ //block pad newline-terminated records with spaces to cbs-size
+ //unblock replace trailing spaces in cbs-size records with newline
+ //ascii from EBCDIC to ASCII
+ //ebcdic from ASCII to EBCDIC
+ //ibm from ASCII to alternate EBCDIC
#endif
};
int exitcode = EXIT_FAILURE;
@@ -138,85 +160,85 @@ int dd_main(int argc, char **argv)
signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
#endif
- for (n = 1; n < argc; n++) {
- smalluint key_len;
- smalluint what;
- char *key;
+ for (n = 1; argv[n]; n++) {
+ int what;
+ char *val;
char *arg = argv[n];
-//XXX:FIXME: we reject plain "dd --" This would cost ~20 bytes, so..
-//if (*arg == '-' && *++arg == '-' && !*++arg) continue;
- key = strstr(arg, "=");
- if (key == NULL)
+#if ENABLE_DESKTOP
+ /* "dd --". NB: coreutils 6.9 will complain if they see
+ * more than one of them. We wouldn't. */
+ if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0')
+ continue;
+#endif
+ val = strchr(arg, '=');
+ if (val == NULL)
bb_show_usage();
- key_len = key - arg + 1;
- key = xstrndup(arg, key_len);
- what = index_in_strings(keywords, key) + 1;
- if (ENABLE_FEATURE_CLEAN_UP)
- free(key);
- if (what == 0)
+ *val = '\0';
+ what = index_in_strings(keywords, arg);
+ if (what < 0)
bb_show_usage();
- arg += key_len;
+ /* *val = '='; - to preserve ps listing? */
+ val++;
#if ENABLE_FEATURE_DD_IBS_OBS
if (what == OP_ibs) {
/* Must fit into positive ssize_t */
- ibs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
- continue;
+ ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ /*continue;*/
}
if (what == OP_obs) {
- obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
- continue;
+ obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ /*continue;*/
}
if (what == OP_conv) {
while (1) {
- /* find ',', replace them with NUL so we can use arg for
+ /* find ',', replace them with NUL so we can use val for
* index_in_strings() without copying.
- * We rely on arg being non-null, else strchr would fault.
+ * We rely on val being non-null, else strchr would fault.
*/
- key = strchr(arg, ',');
- if (key)
- *key = '\0';
- what = index_in_strings(keywords, arg) + 1;
- if (what < OP_conv_notrunc)
- bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
- if (what == OP_conv_notrunc)
- flags |= FLAG_NOTRUNC;
- if (what == OP_conv_sync)
- flags |= FLAG_SYNC;
- if (what == OP_conv_noerror)
- flags |= FLAG_NOERROR;
- if (!key) /* no ',' left, so this was the last specifier */
+ arg = strchr(val, ',');
+ if (arg)
+ *arg = '\0';
+ what = index_in_strings(conv_words, val);
+ if (what < 0)
+ bb_error_msg_and_die(bb_msg_invalid_arg, val, "conv");
+ flags |= (1 << what);
+ if (!arg) /* no ',' left, so this was the last specifier */
break;
- arg = key + 1; /* skip this keyword and ',' */
+ /* *arg = ','; - to preserve ps listing? */
+ val = arg + 1; /* skip this keyword and ',' */
}
- continue;
+ continue; /* we trashed 'what', can't fall through */
}
#endif
if (what == OP_bs) {
- ibs = obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
- continue;
+ ibs = obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
+ /*continue;*/
}
/* These can be large: */
if (what == OP_count) {
flags |= FLAG_COUNT;
- count = XATOU_SFX(arg, dd_suffixes);
- continue;
+ count = XATOU_SFX(val, dd_suffixes);
+ /*continue;*/
}
if (what == OP_seek) {
- seek = XATOU_SFX(arg, dd_suffixes);
- continue;
+ seek = XATOU_SFX(val, dd_suffixes);
+ /*continue;*/
}
if (what == OP_skip) {
- skip = XATOU_SFX(arg, dd_suffixes);
- continue;
+ skip = XATOU_SFX(val, dd_suffixes);
+ /*continue;*/
}
if (what == OP_if) {
- infile = arg;
- continue;
+ infile = val;
+ /*continue;*/
}
- if (what == OP_of)
- outfile = arg;
- }
+ if (what == OP_of) {
+ outfile = val;
+ /*continue;*/
+ }
+ } /* end of "for (argv[n])" */
+
//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
ibuf = obuf = xmalloc(ibs);
if (ibs != obs) {
@@ -304,13 +326,17 @@ int dd_main(int argc, char **argv)
}
} else if (write_and_stats(ibuf, n, obs, outfile))
goto out_status;
+
+ if (flags & FLAG_FSYNC) {
+ if (fsync(ofd) < 0)
+ goto die_outfile;
+ }
}
if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
w = full_write_or_warn(obuf, oc, outfile);
if (w < 0) goto out_status;
- if (w > 0)
- G.out_part++;
+ if (w > 0) G.out_part++;
}
if (close(ifd) < 0) {
die_infile:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 02:46:55 +0000