busybox/coreutils/dd.c

/* vi: set sw=4 ts=4: */
/*
 * Mini dd implementation for busybox
 *
 *
 * Copyright (C) 2000,2001  Matt Kraai
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

/* This is a NOEXEC applet. Be very careful! */


enum {
	ifd = STDIN_FILENO,
	ofd = STDOUT_FILENO,
};

static const struct suffix_mult dd_suffixes[] = {
	{ "c", 1 },
	{ "w", 2 },
	{ "b", 512 },
	{ "kD", 1000 },
	{ "k", 1024 },
	{ "K", 1024 },	/* compat with coreutils dd */
	{ "MD", 1000000 },
	{ "M", 1048576 },
	{ "GD", 1000000000 },
	{ "G", 1073741824 },
	{ "", 0 }
};

struct globals {
	off_t out_full, out_part, in_full, in_part;
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
	unsigned long long total_bytes;
	unsigned long long begin_time_us;
#endif
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { \
	/* we have to zero it out because of NOEXEC */ \
	memset(&G, 0, sizeof(G)); \
} while (0)


static void dd_output_status(int UNUSED_PARAM cur_signal)
{
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
	double seconds;
	unsigned long long bytes_sec;
	unsigned long long now_us = monotonic_us(); /* before fprintf */
#endif

	/* Deliberately using %u, not %d */
	fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n"
			"%"OFF_FMT"u+%"OFF_FMT"u records out\n",
			G.in_full, G.in_part,
			G.out_full, G.out_part);

#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
	fprintf(stderr, "%llu bytes (%sB) copied, ",
			G.total_bytes,
			/* show fractional digit, use suffixes */
			make_human_readable_str(G.total_bytes, 1, 0)
	);
	/* Corner cases:
	 * ./busybox dd </dev/null >/dev/null
	 * ./busybox dd bs=1M count=2000 </dev/zero >/dev/null
	 * (echo DONE) | ./busybox dd >/dev/null
	 * (sleep 1; echo DONE) | ./busybox dd >/dev/null
	 */
	seconds = (now_us - G.begin_time_us) / 1000000.0;
	bytes_sec = G.total_bytes / seconds;
	fprintf(stderr, "%f seconds, %sB/s\n",
			seconds,
			/* show fractional digit, use suffixes */
			make_human_readable_str(bytes_sec, 1, 0)
	);
#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++;
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
	G.total_bytes += n;
#endif
	return 0;
}

#if ENABLE_LFS
# define XATOU_SFX xatoull_sfx
#else
# define XATOU_SFX xatoul_sfx
#endif

int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dd_main(int argc UNUSED_PARAM, char **argv)
{
	enum {
		/* 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"
#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 = 0,
		OP_count,
		OP_seek,
		OP_skip,
		OP_if,
		OP_of,
#if ENABLE_FEATURE_DD_IBS_OBS
		OP_ibs,
		OP_obs,
		OP_conv,
		/* 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;
	size_t ibs = 512, obs = 512;
	ssize_t n, w;
	char *ibuf, *obuf;
	/* And these are all zeroed at once! */
	struct {
		int flags;
		size_t oc;
		off_t count;
		off_t seek, skip;
		const char *infile, *outfile;
	} Z;
#define flags   (Z.flags  )
#define oc      (Z.oc     )
#define count   (Z.count  )
#define seek    (Z.seek   )
#define skip    (Z.skip   )
#define infile  (Z.infile )
#define outfile (Z.outfile)

	memset(&Z, 0, sizeof(Z));
	INIT_G();
	//fflush_all(); - is this needed because of NOEXEC?

	for (n = 1; argv[n]; n++) {
		int what;
		char *val;
		char *arg = argv[n];

#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();
		*val = '\0';
		what = index_in_strings(keywords, arg);
		if (what < 0)
			bb_show_usage();
		/* *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(val, 1, ((size_t)-1L)/2, dd_suffixes);
			/*continue;*/
		}
		if (what == OP_obs) {
			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 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';
				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 = ','; - to preserve ps listing? */
				val = arg + 1; /* skip this keyword and ',' */
			}
			continue; /* we trashed 'what', can't fall through */
		}
#endif
		if (what == OP_bs) {
			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(val, dd_suffixes);
			/*continue;*/
		}
		if (what == OP_seek) {
			seek = XATOU_SFX(val, dd_suffixes);
			/*continue;*/
		}
		if (what == OP_skip) {
			skip = XATOU_SFX(val, dd_suffixes);
			/*continue;*/
		}
		if (what == OP_if) {
			infile = val;
			/*continue;*/
		}
		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) {
		flags |= FLAG_TWOBUFS;
		obuf = xmalloc(obs);
	}

#if ENABLE_FEATURE_DD_SIGNAL_HANDLING
	signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
#endif
#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
	G.begin_time_us = monotonic_us();
#endif

	if (infile != NULL)
		xmove_fd(xopen(infile, O_RDONLY), ifd);
	else {
		infile = bb_msg_standard_input;
	}
	if (outfile != NULL) {
		int oflag = O_WRONLY | O_CREAT;

		if (!seek && !(flags & FLAG_NOTRUNC))
			oflag |= O_TRUNC;

		xmove_fd(xopen(outfile, oflag), ofd);

		if (seek && !(flags & FLAG_NOTRUNC)) {
			if (ftruncate(ofd, seek * obs) < 0) {
				struct stat st;

				if (fstat(ofd, &st) < 0
				 || S_ISREG(st.st_mode)
				 || S_ISDIR(st.st_mode)
				) {
					goto die_outfile;
				}
			}
		}
	} else {
		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)
					goto die_infile;
				if (n == 0)
					break;
			}
		}
	}
	if (seek) {
		if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
			goto die_outfile;
	}

	while (!(flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) {
		n = safe_read(ifd, ibuf, ibs);
		if (n == 0)
			break;
		if (n < 0) {
			/* "Bad block" */
			if (!(flags & FLAG_NOERROR))
				goto die_infile;
			bb_simple_perror_msg(infile);
			/* GNU dd with conv=noerror skips over bad blocks */
			xlseek(ifd, ibs, SEEK_CUR);
			/* conv=noerror,sync writes NULs,
			 * conv=noerror just ignores input bad blocks */
			n = 0;
		}
		if ((size_t)n == ibs)
			G.in_full++;
		else {
			G.in_part++;
			if (flags & FLAG_SYNC) {
				memset(ibuf + n, 0, ibs - n);
				n = ibs;
			}
		}
		if (flags & FLAG_TWOBUFS) {
			char *tmp = ibuf;
			while (n) {
				size_t d = obs - oc;

				if (d > (size_t)n)
					d = n;
				memcpy(obuf + oc, tmp, d);
				n -= d;
				tmp += d;
				oc += d;
				if (oc == obs) {
					if (write_and_stats(obuf, obs, obs, outfile))
						goto out_status;
					oc = 0;
				}
			}
		} 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 (close(ifd) < 0) {
 die_infile:
		bb_simple_perror_msg_and_die(infile);
	}

	if (close(ofd) < 0) {
 die_outfile:
		bb_simple_perror_msg_and_die(outfile);
	}

	exitcode = EXIT_SUCCESS;
 out_status:
	dd_output_status(0);

	return exitcode;
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Mini dd implementation for busybox
4			*
5			*
6			* Copyright (C) 2000,2001 Matt Kraai
7			*
8			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9			*/
10
11	niro	816	#include "libbb.h"
12	niro	532
13	niro	816	/* This is a NOEXEC applet. Be very careful! */
14
15
16			enum {
17			ifd = STDIN_FILENO,
18			ofd = STDOUT_FILENO,
19			};
20
21	niro	532	static const struct suffix_mult dd_suffixes[] = {
22			{ "c", 1 },
23			{ "w", 2 },
24			{ "b", 512 },
25			{ "kD", 1000 },
26			{ "k", 1024 },
27	niro	816	{ "K", 1024 }, /* compat with coreutils dd */
28	niro	532	{ "MD", 1000000 },
29			{ "M", 1048576 },
30			{ "GD", 1000000000 },
31			{ "G", 1073741824 },
32	niro	984	{ "", 0 }
33	niro	532	};
34
35	niro	816	struct globals {
36			off_t out_full, out_part, in_full, in_part;
37	niro	984	#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
38			unsigned long long total_bytes;
39			unsigned long long begin_time_us;
40			#endif
41	niro	1123	} FIX_ALIASING;
42	niro	816	#define G ((struct globals)&bb_common_bufsiz1)
43	niro	984	#define INIT_G() do { \
44			/* we have to zero it out because of NOEXEC */ \
45			memset(&G, 0, sizeof(G)); \
46			} while (0)
47	niro	532
48	niro	816
49			static void dd_output_status(int UNUSED_PARAM cur_signal)
50	niro	532	{
51	niro	984	#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
52			double seconds;
53			unsigned long long bytes_sec;
54			unsigned long long now_us = monotonic_us(); /* before fprintf */
55			#endif
56
57	niro	816	/* Deliberately using %u, not %d */
58			fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n"
59			"%"OFF_FMT"u+%"OFF_FMT"u records out\n",
60			G.in_full, G.in_part,
61			G.out_full, G.out_part);
62	niro	984
63			#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
64			fprintf(stderr, "%llu bytes (%sB) copied, ",
65			G.total_bytes,
66			/* show fractional digit, use suffixes */
67			make_human_readable_str(G.total_bytes, 1, 0)
68			);
69			/* Corner cases:
70			* ./busybox dd </dev/null >/dev/null
71			* ./busybox dd bs=1M count=2000 </dev/zero >/dev/null
72			* (echo DONE) \| ./busybox dd >/dev/null
73			* (sleep 1; echo DONE) \| ./busybox dd >/dev/null
74			*/
75			seconds = (now_us - G.begin_time_us) / 1000000.0;
76			bytes_sec = G.total_bytes / seconds;
77			fprintf(stderr, "%f seconds, %sB/s\n",
78			seconds,
79			/* show fractional digit, use suffixes */
80			make_human_readable_str(bytes_sec, 1, 0)
81			);
82			#endif
83	niro	532	}
84
85	niro	816	static ssize_t full_write_or_warn(const void *buf, size_t len,
86			const char *const filename)
87	niro	532	{
88	niro	816	ssize_t n = full_write(ofd, buf, len);
89	niro	532	if (n < 0)
90			bb_perror_msg("writing '%s'", filename);
91			return n;
92			}
93
94	niro	816	static bool write_and_stats(const void *buf, size_t len, size_t obs,
95			const char *filename)
96			{
97			ssize_t n = full_write_or_warn(buf, len, filename);
98			if (n < 0)
99			return 1;
100			if ((size_t)n == obs)
101			G.out_full++;
102			else if (n) /* > 0 */
103			G.out_part++;
104	niro	984	#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
105			G.total_bytes += n;
106			#endif
107	niro	816	return 0;
108			}
109
110	niro	532	#if ENABLE_LFS
111	niro	984	# define XATOU_SFX xatoull_sfx
112	niro	532	#else
113	niro	984	# define XATOU_SFX xatoul_sfx
114	niro	532	#endif
115
116	niro	816	int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
117			int dd_main(int argc UNUSED_PARAM, char **argv)
118	niro	532	{
119			enum {
120	niro	816	/* Must be in the same order as OP_conv_XXX! */
121			/* (see "flags \|= (1 << what)" below) */
122			FLAG_NOTRUNC = 1 << 0,
123			FLAG_SYNC = 1 << 1,
124			FLAG_NOERROR = 1 << 2,
125			FLAG_FSYNC = 1 << 3,
126			/* end of conv flags */
127			FLAG_TWOBUFS = 1 << 4,
128			FLAG_COUNT = 1 << 5,
129	niro	532	};
130	niro	816	static const char keywords[] ALIGN1 =
131			"bs\0""count\0""seek\0""skip\0""if\0""of\0"
132			#if ENABLE_FEATURE_DD_IBS_OBS
133			"ibs\0""obs\0""conv\0"
134			#endif
135			;
136			#if ENABLE_FEATURE_DD_IBS_OBS
137			static const char conv_words[] ALIGN1 =
138			"notrunc\0""sync\0""noerror\0""fsync\0";
139			#endif
140			enum {
141			OP_bs = 0,
142			OP_count,
143			OP_seek,
144			OP_skip,
145			OP_if,
146			OP_of,
147			#if ENABLE_FEATURE_DD_IBS_OBS
148			OP_ibs,
149			OP_obs,
150			OP_conv,
151			/* Must be in the same order as FLAG_XXX! */
152			OP_conv_notrunc = 0,
153			OP_conv_sync,
154			OP_conv_noerror,
155			OP_conv_fsync,
156			/* Unimplemented conv=XXX: */
157			//nocreat do not create the output file
158			//excl fail if the output file already exists
159			//fdatasync physically write output file data before finishing
160			//swab swap every pair of input bytes
161			//lcase change upper case to lower case
162			//ucase change lower case to upper case
163			//block pad newline-terminated records with spaces to cbs-size
164			//unblock replace trailing spaces in cbs-size records with newline
165			//ascii from EBCDIC to ASCII
166			//ebcdic from ASCII to EBCDIC
167			//ibm from ASCII to alternate EBCDIC
168			#endif
169			};
170			int exitcode = EXIT_FAILURE;
171			size_t ibs = 512, obs = 512;
172	niro	532	ssize_t n, w;
173			char ibuf, obuf;
174	niro	816	/* And these are all zeroed at once! */
175			struct {
176			int flags;
177			size_t oc;
178			off_t count;
179			off_t seek, skip;
180			const char infile, outfile;
181			} Z;
182			#define flags (Z.flags )
183			#define oc (Z.oc )
184			#define count (Z.count )
185			#define seek (Z.seek )
186			#define skip (Z.skip )
187			#define infile (Z.infile )
188			#define outfile (Z.outfile)
189	niro	532
190	niro	816	memset(&Z, 0, sizeof(Z));
191			INIT_G();
192	niro	984	//fflush_all(); - is this needed because of NOEXEC?
193	niro	532
194	niro	816	for (n = 1; argv[n]; n++) {
195			int what;
196			char *val;
197	niro	532	char *arg = argv[n];
198
199	niro	816	#if ENABLE_DESKTOP
200			/* "dd --". NB: coreutils 6.9 will complain if they see
201			* more than one of them. We wouldn't. */
202			if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0')
203			continue;
204			#endif
205			val = strchr(arg, '=');
206			if (val == NULL)
207			bb_show_usage();
208			*val = '\0';
209			what = index_in_strings(keywords, arg);
210			if (what < 0)
211			bb_show_usage();
212			/* val = '='; - to preserve ps listing? /
213			val++;
214			#if ENABLE_FEATURE_DD_IBS_OBS
215			if (what == OP_ibs) {
216			/* Must fit into positive ssize_t */
217			ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
218			/continue;/
219			}
220			if (what == OP_obs) {
221			obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
222			/continue;/
223			}
224			if (what == OP_conv) {
225	niro	532	while (1) {
226	niro	816	/* find ',', replace them with NUL so we can use val for
227			* index_in_strings() without copying.
228			* We rely on val being non-null, else strchr would fault.
229			*/
230			arg = strchr(val, ',');
231			if (arg)
232			*arg = '\0';
233			what = index_in_strings(conv_words, val);
234			if (what < 0)
235			bb_error_msg_and_die(bb_msg_invalid_arg, val, "conv");
236			flags \|= (1 << what);
237			if (!arg) /* no ',' left, so this was the last specifier */
238			break;
239			/* arg = ','; - to preserve ps listing? /
240			val = arg + 1; /* skip this keyword and ',' */
241	niro	532	}
242	niro	816	continue; /* we trashed 'what', can't fall through */
243			}
244			#endif
245			if (what == OP_bs) {
246			ibs = obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes);
247			/continue;/
248			}
249			/* These can be large: */
250			if (what == OP_count) {
251			flags \|= FLAG_COUNT;
252			count = XATOU_SFX(val, dd_suffixes);
253			/continue;/
254			}
255			if (what == OP_seek) {
256			seek = XATOU_SFX(val, dd_suffixes);
257			/continue;/
258			}
259			if (what == OP_skip) {
260			skip = XATOU_SFX(val, dd_suffixes);
261			/continue;/
262			}
263			if (what == OP_if) {
264			infile = val;
265			/continue;/
266			}
267			if (what == OP_of) {
268			outfile = val;
269			/continue;/
270			}
271			} /* end of "for (argv[n])" */
272	niro	532
273	niro	816	//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
274	niro	532	ibuf = obuf = xmalloc(ibs);
275			if (ibs != obs) {
276	niro	816	flags \|= FLAG_TWOBUFS;
277	niro	532	obuf = xmalloc(obs);
278			}
279	niro	984
280			#if ENABLE_FEATURE_DD_SIGNAL_HANDLING
281			signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status);
282			#endif
283			#if ENABLE_FEATURE_DD_THIRD_STATUS_LINE
284			G.begin_time_us = monotonic_us();
285			#endif
286
287	niro	532	if (infile != NULL)
288	niro	816	xmove_fd(xopen(infile, O_RDONLY), ifd);
289	niro	532	else {
290			infile = bb_msg_standard_input;
291			}
292			if (outfile != NULL) {
293	niro	816	int oflag = O_WRONLY \| O_CREAT;
294	niro	532
295	niro	816	if (!seek && !(flags & FLAG_NOTRUNC))
296	niro	532	oflag \|= O_TRUNC;
297
298	niro	816	xmove_fd(xopen(outfile, oflag), ofd);
299	niro	532
300	niro	816	if (seek && !(flags & FLAG_NOTRUNC)) {
301	niro	532	if (ftruncate(ofd, seek * obs) < 0) {
302			struct stat st;
303
304	niro	1123	if (fstat(ofd, &st) < 0
305			\|\| S_ISREG(st.st_mode)
306			\|\| S_ISDIR(st.st_mode)
307			) {
308	niro	532	goto die_outfile;
309	niro	1123	}
310	niro	532	}
311			}
312			} else {
313			outfile = bb_msg_standard_output;
314			}
315			if (skip) {
316			if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
317			while (skip-- > 0) {
318			n = safe_read(ifd, ibuf, ibs);
319			if (n < 0)
320	niro	816	goto die_infile;
321	niro	532	if (n == 0)
322			break;
323			}
324			}
325			}
326			if (seek) {
327			if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
328			goto die_outfile;
329			}
330
331	niro	816	while (!(flags & FLAG_COUNT) \|\| (G.in_full + G.in_part != count)) {
332	niro	532	n = safe_read(ifd, ibuf, ibs);
333			if (n == 0)
334			break;
335			if (n < 0) {
336	niro	984	/* "Bad block" */
337	niro	816	if (!(flags & FLAG_NOERROR))
338			goto die_infile;
339			bb_simple_perror_msg(infile);
340	niro	984	/* GNU dd with conv=noerror skips over bad blocks */
341			xlseek(ifd, ibs, SEEK_CUR);
342			/* conv=noerror,sync writes NULs,
343			* conv=noerror just ignores input bad blocks */
344			n = 0;
345	niro	532	}
346			if ((size_t)n == ibs)
347	niro	816	G.in_full++;
348	niro	532	else {
349	niro	816	G.in_part++;
350			if (flags & FLAG_SYNC) {
351	niro	984	memset(ibuf + n, 0, ibs - n);
352	niro	532	n = ibs;
353			}
354			}
355	niro	816	if (flags & FLAG_TWOBUFS) {
356	niro	532	char *tmp = ibuf;
357			while (n) {
358			size_t d = obs - oc;
359
360	niro	816	if (d > (size_t)n)
361	niro	532	d = n;
362			memcpy(obuf + oc, tmp, d);
363			n -= d;
364			tmp += d;
365			oc += d;
366			if (oc == obs) {
367	niro	816	if (write_and_stats(obuf, obs, obs, outfile))
368			goto out_status;
369	niro	532	oc = 0;
370			}
371			}
372	niro	816	} else if (write_and_stats(ibuf, n, obs, outfile))
373			goto out_status;
374
375			if (flags & FLAG_FSYNC) {
376			if (fsync(ofd) < 0)
377			goto die_outfile;
378	niro	532	}
379			}
380
381			if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
382	niro	816	w = full_write_or_warn(obuf, oc, outfile);
383	niro	532	if (w < 0) goto out_status;
384	niro	816	if (w > 0) G.out_part++;
385	niro	532	}
386			if (close(ifd) < 0) {
387	niro	816	die_infile:
388			bb_simple_perror_msg_and_die(infile);
389	niro	532	}
390
391			if (close(ofd) < 0) {
392			die_outfile:
393	niro	816	bb_simple_perror_msg_and_die(outfile);
394	niro	532	}
395	niro	816
396			exitcode = EXIT_SUCCESS;
397	niro	532	out_status:
398			dd_output_status(0);
399
400	niro	816	return exitcode;
401	niro	532	}