1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/* dd.c - program to convert and copy a file.
*
* Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
* Copyright 2013 Kyungwan Han <asura321@gmail.com>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/dd.html
*
* todo: ctrl-c doesn't work, the read() is restarting.
USE_DD(NEWTOY(dd, 0, TOYFLAG_USR|TOYFLAG_BIN))
config DD
bool "dd"
default n
help
usage: dd [if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N] [skip=N]
[seek=N] [conv=notrunc|noerror|sync|fsync] [status=noxfer|none]
Copy/convert files.
if=FILE Read from FILE instead of stdin
of=FILE Write to FILE instead of stdout
bs=N Read and write N bytes at a time
ibs=N Read N bytes at a time
obs=N Write N bytes at a time
count=N Copy only N input blocks
skip=N Skip N input blocks
seek=N Skip N output blocks
conv=notrunc Don't truncate output file
conv=noerror Continue after read errors
conv=sync Pad blocks with zeros
conv=fsync Physically write data out before finishing
status=noxfer Don't show transfer rate
status=none Don't show transfer rate or records in/out
Numbers may be suffixed by c (*1), w (*2), b (*512), kD (*1000), k (*1024),
MD (*1000*1000), M (*1024*1024), GD (*1000*1000*1000) or G (*1024*1024*1024).
*/
#define FOR_dd
#include "toys.h"
GLOBALS(
int show_xfer, show_records;
unsigned long long bytes, c_count, in_full, in_part, out_full, out_part;
struct timeval start;
struct {
char *name;
int fd;
unsigned char *buff, *bp;
long sz, count;
unsigned long long offset;
} in, out;
);
#define C_FSYNC 1
#define C_NOERROR 2
#define C_NOTRUNC 4
#define C_SYNC 8
static void status()
{
double seconds;
struct timeval now;
gettimeofday(&now, NULL);
seconds = ((now.tv_sec * 1000000 + now.tv_usec) -
(TT.start.tv_sec * 1000000 + TT.start.tv_usec))/1000000.0;
if (TT.show_records)
fprintf(stderr, "%llu+%llu records in\n%llu+%llu records out\n",
TT.in_full, TT.in_part, TT.out_full, TT.out_part);
if (TT.show_xfer) {
human_readable(toybuf, TT.bytes, HR_SPACE|HR_B);
fprintf(stderr, "%llu bytes (%s) copied, ", TT.bytes, toybuf);
human_readable(toybuf, TT.bytes/seconds, HR_SPACE|HR_B);
fprintf(stderr, "%f s, %s/s\n", seconds, toybuf);
}
}
static void write_out(int all)
{
TT.out.bp = TT.out.buff;
while (TT.out.count) {
ssize_t nw = writeall(TT.out.fd, TT.out.bp, ((all)? TT.out.count : TT.out.sz));
all = 0; //further writes will be on obs
if (nw <= 0) perror_exit("%s: write error", TT.out.name);
if (nw == TT.out.sz) TT.out_full++;
else TT.out_part++;
TT.out.count -= nw;
TT.out.bp += nw;
TT.bytes += nw;
if (TT.out.count < TT.out.sz) break;
}
if (TT.out.count) memmove(TT.out.buff, TT.out.bp, TT.out.count); //move remainder to front
}
int strstarteq(char **a, char *b)
{
char *aa = *a;
return strstart(&aa, b) && *aa == '=' && (*a = aa+1);
}
void dd_main()
{
char **args;
unsigned long long bs = 0;
int trunc = O_TRUNC, conv = 0;
TT.show_xfer = TT.show_records = 1;
TT.c_count = ULLONG_MAX;
TT.in.sz = TT.out.sz = 512; //default io block size
for (args = toys.optargs; *args; args++) {
char *arg = *args;
if (strstarteq(&arg, "bs")) bs = atolx_range(arg, 1, LONG_MAX);
else if (strstarteq(&arg, "ibs")) TT.in.sz = atolx_range(arg, 1, LONG_MAX);
else if (strstarteq(&arg, "obs")) TT.out.sz = atolx_range(arg, 1, LONG_MAX);
else if (strstarteq(&arg, "count"))
TT.c_count = atolx_range(arg, 0, LLONG_MAX);
else if (strstarteq(&arg, "if")) TT.in.name = arg;
else if (strstarteq(&arg, "of")) TT.out.name = arg;
else if (strstarteq(&arg, "seek"))
TT.out.offset = atolx_range(arg, 0, LLONG_MAX);
else if (strstarteq(&arg, "skip"))
TT.in.offset = atolx_range(arg, 0, LLONG_MAX);
else if (strstarteq(&arg, "status")) {
if (!strcmp(arg, "noxfer")) TT.show_xfer = 0;
else if (!strcmp(arg, "none")) TT.show_xfer = TT.show_records = 0;
else error_exit("unknown status '%s'", arg);
} else if (strstarteq(&arg, "conv")) {
char *ss, *convs[] = {"fsync", "noerror", "notrunc", "sync"};
int i, len;
while ((ss = comma_iterate(&arg, &len))) {
for (i = 0; i<ARRAY_LEN(convs); i++)
if (len == strlen(convs[i]) && !strncmp(ss, convs[i], len)) break;
if (i == ARRAY_LEN(convs)) error_exit("bad conv=%.*s", len, ss);
conv |= 1<<i;
}
} else error_exit("bad arg %s", arg);
}
if (bs) TT.in.sz = TT.out.sz = bs;
signal(SIGINT, generic_signal);
signal(SIGUSR1, generic_signal);
gettimeofday(&TT.start, NULL);
/* for bs=, in/out is done as it is. so only in.sz is enough.
* With Single buffer there will be overflow in a read following partial read
*/
TT.in.buff = TT.out.buff = xmalloc(TT.in.sz + (bs ? 0 : TT.out.sz));
TT.in.bp = TT.out.bp = TT.in.buff;
//setup input
if (!TT.in.name) TT.in.name = "stdin";
else TT.in.fd = xopenro(TT.in.name);
if (conv&C_NOTRUNC) trunc = 0;
//setup output
if (!TT.out.name) {
TT.out.name = "stdout";
TT.out.fd = 1;
} else TT.out.fd = xcreate(TT.out.name,
O_WRONLY|O_CREAT|(trunc*!TT.out.offset), 0666);
// Implement skip=
if (TT.in.offset) {
if (lseek(TT.in.fd, (off_t)(TT.in.offset * TT.in.sz), SEEK_CUR) < 0) {
while (TT.in.offset--) {
ssize_t n = read(TT.in.fd, TT.in.bp, TT.in.sz);
if (n < 0) {
perror_msg("%s", TT.in.name);
if (conv&C_NOERROR) status();
else return;
} else if (!n) {
xprintf("%s: Can't skip\n", TT.in.name);
return;
}
}
}
}
// seek/truncate as necessary. We handled position zero truncate with
// O_TRUNC on open, so output to /dev/null and such doesn't error.
if (TT.out.fd!=1 && (bs = TT.out.offset*TT.out.sz)) {
xlseek(TT.out.fd, bs, SEEK_CUR);
if (trunc && ftruncate(TT.out.fd, bs)) perror_exit("ftruncate");
}
while (TT.c_count==ULLONG_MAX || (TT.in_full + TT.in_part) < TT.c_count) {
ssize_t n;
// Show progress and exit on SIGINT or just continue on SIGUSR1.
if (toys.signal) {
status();
if (toys.signal==SIGINT) exit_signal(toys.signal);
toys.signal = 0;
}
TT.in.bp = TT.in.buff + TT.in.count;
if (conv&C_SYNC) memset(TT.in.bp, 0, TT.in.sz);
if (!(n = read(TT.in.fd, TT.in.bp, TT.in.sz))) break;
if (n < 0) {
if (errno == EINTR) continue;
//read error case.
perror_msg("%s: read error", TT.in.name);
if (!(conv&C_NOERROR)) exit(1);
status();
xlseek(TT.in.fd, TT.in.sz, SEEK_CUR);
if (!(conv&C_SYNC)) continue;
// if SYNC, then treat as full block of nuls
n = TT.in.sz;
}
if (n == TT.in.sz) {
TT.in_full++;
TT.in.count += n;
} else {
TT.in_part++;
if (conv&C_SYNC) TT.in.count += TT.in.sz;
else TT.in.count += n;
}
TT.out.count = TT.in.count;
if (bs) {
write_out(1);
TT.in.count = 0;
continue;
}
if (TT.in.count >= TT.out.sz) {
write_out(0);
TT.in.count = TT.out.count;
}
}
if (TT.out.count) write_out(1); //write any remaining input blocks
if ((conv&C_FSYNC) && fsync(TT.out.fd)<0)
perror_exit("%s: fsync", TT.out.name);
close(TT.in.fd);
close(TT.out.fd);
if (TT.in.buff) free(TT.in.buff);
status();
}
|
