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-rw-r--r--coreutils/dd.c204
1 files changed, 130 insertions, 74 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 4a094e8..518c5fe 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -17,7 +17,7 @@ static const struct suffix_mult dd_suffixes[] = {
{ "b", 512 },
{ "kD", 1000 },
{ "k", 1024 },
- { "K", 1024 }, // compat with coreutils dd
+ { "K", 1024 }, /* compat with coreutils dd */
{ "MD", 1000000 },
{ "M", 1048576 },
{ "GD", 1000000000 },
@@ -25,18 +25,21 @@ static const struct suffix_mult dd_suffixes[] = {
{ NULL, 0 }
};
-static off_t out_full, out_part, in_full, in_part;
+struct globals {
+ off_t out_full, out_part, in_full, in_part;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
{
fprintf(stderr, "%"OFF_FMT"d+%"OFF_FMT"d records in\n"
"%"OFF_FMT"d+%"OFF_FMT"d records out\n",
- in_full, in_part,
- out_full, out_part);
+ G.in_full, G.in_part,
+ G.out_full, G.out_part);
}
static ssize_t full_write_or_warn(int fd, const void *buf, size_t len,
- const char* filename)
+ const char * const filename)
{
ssize_t n = full_write(fd, buf, len);
if (n < 0)
@@ -44,6 +47,19 @@ static ssize_t full_write_or_warn(int fd, const void *buf, size_t len,
return n;
}
+static bool write_and_stats(int fd, const void *buf, size_t len, size_t obs,
+ const char * const filename)
+{
+ ssize_t n = full_write_or_warn(fd, buf, len, filename);
+ if (n < 0)
+ return 1;
+ if (n == obs)
+ G.out_full++;
+ else if (n > 0)
+ G.out_part++;
+ return 0;
+}
+
#if ENABLE_LFS
#define XATOU_SFX xatoull_sfx
#else
@@ -59,11 +75,31 @@ int dd_main(int argc, char **argv)
trunc_flag = 1 << 2,
twobufs_flag = 1 << 3,
};
+ const char * const keywords[] = {
+ "bs=", "count=", "seek=", "skip=", "if=", "of=",
+#if ENABLE_FEATURE_DD_IBS_OBS
+ "ibs=", "obs=", "conv=", "notrunc", "sync", "noerror",
+#endif
+ NULL
+ };
+#define OP_bs 0 + 1
+#define OP_count OP_bs + 1
+#define OP_seek OP_count + 1
+#define OP_skip OP_seek + 1
+#define OP_if OP_skip + 1
+#define OP_of OP_if + 1
+#define OP_ibs OP_of + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_obs OP_ibs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv OP_obs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_notrunc OP_conv + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_sync OP_conv_notrunc + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_noerror OP_conv_sync + ENABLE_FEATURE_DD_IBS_OBS
+
int flags = trunc_flag;
size_t oc = 0, ibs = 512, obs = 512;
ssize_t n, w;
off_t seek = 0, skip = 0, count = OFF_T_MAX;
- int oflag, ifd, ofd;
+ int ifd, ofd;
const char *infile = NULL, *outfile = NULL;
char *ibuf, *obuf;
@@ -78,63 +114,96 @@ int dd_main(int argc, char **argv)
}
for (n = 1; n < argc; n++) {
+ smalluint key_len, what;
+ char *key;
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)
+ bb_show_usage();
+ key_len = key - arg + 1;
+ key = xstrndup(arg, key_len);
+ what = index_in_str_array(keywords, key) + 1;
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(key);
+ if (what == 0)
+ bb_show_usage();
+ arg += key_len;
/* Must fit into positive ssize_t */
- if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", arg, 4))
- ibs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes);
- else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", arg, 4))
- obs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes);
- else if (!strncmp("bs=", arg, 3))
- ibs = obs = xatoul_range_sfx(arg+3, 0, ((size_t)-1L)/2, dd_suffixes);
- /* These can be large: */
- else if (!strncmp("count=", arg, 6))
- count = XATOU_SFX(arg+6, dd_suffixes);
- else if (!strncmp("seek=", arg, 5))
- seek = XATOU_SFX(arg+5, dd_suffixes);
- else if (!strncmp("skip=", arg, 5))
- skip = XATOU_SFX(arg+5, dd_suffixes);
-
- else if (!strncmp("if=", arg, 3))
- infile = arg+3;
- else if (!strncmp("of=", arg, 3))
- outfile = arg+3;
- else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", arg, 5)) {
- arg += 5;
- while (1) {
- if (!strncmp("notrunc", arg, 7)) {
- flags &= ~trunc_flag;
- arg += 7;
- } else if (!strncmp("sync", arg, 4)) {
- flags |= sync_flag;
- arg += 4;
- } else if (!strncmp("noerror", arg, 7)) {
- flags |= noerror;
- arg += 7;
- } else {
- bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
+ if (ENABLE_FEATURE_DD_IBS_OBS) {
+ if (what == OP_ibs) {
+ ibs = xatoul_range_sfx(arg, 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;
+ }
+ if (what == OP_conv) {
+ while (1) {
+ /* find ',', replace them with nil so we can use arg for
+ * index_in_str_array without copying.
+ * We rely on arg being non-null, else strstr would fault.
+ */
+ key = strstr(arg, ",");
+ if (key)
+ *key = '\0';
+ what = index_in_str_array(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 &= ~trunc_flag;
+ if (what == OP_conv_sync)
+ flags |= sync_flag;
+ if (what == OP_conv_noerror)
+ flags |= noerror;
+ if (!key) /* no ',' left, so this was the last specifier */
+ break;
+ arg += key - arg + 1; /* skip this keyword plus ',' */
}
- if (arg[0] == '\0') break;
- if (*arg++ != ',') bb_show_usage();
+ continue;
}
- } else
- bb_show_usage();
+ }
+ if (what == OP_bs) {
+ ibs = obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
+ }
+ /* These can be large: */
+ if (what == OP_count) {
+ count = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == OP_seek) {
+ seek = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == skip) {
+ skip = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == OP_if) {
+ infile = arg;
+ continue;
+ }
+ if (what == OP_of)
+ outfile = arg;
}
-
+//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
ibuf = obuf = xmalloc(ibs);
if (ibs != obs) {
flags |= twobufs_flag;
obuf = xmalloc(obs);
}
-
if (infile != NULL)
ifd = xopen(infile, O_RDONLY);
else {
ifd = STDIN_FILENO;
infile = bb_msg_standard_input;
}
-
if (outfile != NULL) {
- oflag = O_WRONLY | O_CREAT;
+ int oflag = O_WRONLY | O_CREAT;
if (!seek && (flags & trunc_flag))
oflag |= O_TRUNC;
@@ -154,30 +223,25 @@ int dd_main(int argc, char **argv)
ofd = STDOUT_FILENO;
outfile = bb_msg_standard_output;
}
-
if (skip) {
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);
+ goto die_infile;
if (n == 0)
break;
}
}
}
-
if (seek) {
if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
goto die_outfile;
}
- while (in_full + in_part != count) {
- if (flags & noerror) {
- /* Pre-zero the buffer when doing the noerror thing */
+ while (G.in_full + G.in_part != count) {
+ if (flags & noerror) /* Pre-zero the buffer when for noerror */
memset(ibuf, '\0', ibs);
- }
-
n = safe_read(ifd, ibuf, ibs);
if (n == 0)
break;
@@ -186,12 +250,12 @@ int dd_main(int argc, char **argv)
n = ibs;
bb_perror_msg("%s", infile);
} else
- bb_perror_msg_and_die("%s", infile);
+ goto die_infile;
}
if ((size_t)n == ibs)
- in_full++;
+ G.in_full++;
else {
- in_part++;
+ G.in_part++;
if (flags & sync_flag) {
memset(ibuf + n, '\0', ibs - n);
n = ibs;
@@ -209,40 +273,32 @@ int dd_main(int argc, char **argv)
tmp += d;
oc += d;
if (oc == obs) {
- w = full_write_or_warn(ofd, obuf, obs, outfile);
- if (w < 0) goto out_status;
- if (w == obs)
- out_full++;
- else if (w > 0)
- out_part++;
+ if (write_and_stats(ofd, obuf, obs, obs, outfile))
+ goto out_status;
oc = 0;
}
}
- } else {
- w = full_write_or_warn(ofd, ibuf, n, outfile);
- if (w < 0) goto out_status;
- if (w == obs)
- out_full++;
- else if (w > 0)
- out_part++;
- }
+ } else
+ if (write_and_stats(ofd, ibuf, n, obs, outfile))
+ goto out_status;
}
if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
w = full_write_or_warn(ofd, obuf, oc, outfile);
if (w < 0) goto out_status;
if (w > 0)
- out_part++;
+ G.out_part++;
}
if (close(ifd) < 0) {
+die_infile:
bb_perror_msg_and_die("%s", infile);
}
if (close(ofd) < 0) {
- die_outfile:
+die_outfile:
bb_perror_msg_and_die("%s", outfile);
}
- out_status:
+out_status:
dd_output_status(0);
return EXIT_SUCCESS;
generated by cgit v1.1 at 2024-11-16 06:41:16 +0000