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
|
/* vi: set sw=4 ts=4: */
/*
* Mini dd implementation for busybox
*
* Copyright (C) 1999, 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Based in part on code taken from sash.
* Copyright (c) 1999 by David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
*
* Permission to distribute this code under the GPL has been granted.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <features.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
#include <inttypes.h>
#else
typedef unsigned long long int uintmax_t;
#endif
extern int dd_main(int argc, char **argv)
{
char *inFile = NULL;
char *outFile = NULL;
int inFd;
int outFd;
int inCc = 0;
int outCc;
long blockSize = 512;
uintmax_t skipBlocks = 0;
uintmax_t seekBlocks = 0;
uintmax_t count = (uintmax_t) - 1;
uintmax_t intotal;
uintmax_t outTotal;
unsigned char *buf;
argc--;
argv++;
/* Parse any options */
while (argc) {
if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
inFile = ((strchr(*argv, '=')) + 1);
else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
outFile = ((strchr(*argv, '=')) + 1);
else if (strncmp("count", *argv, 5) == 0) {
count = getNum((strchr(*argv, '=')) + 1);
if (count <= 0) {
errorMsg("Bad count value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "bs", 2) == 0) {
blockSize = getNum((strchr(*argv, '=')) + 1);
if (blockSize <= 0) {
errorMsg("Bad block size value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "skip", 4) == 0) {
skipBlocks = getNum((strchr(*argv, '=')) + 1);
if (skipBlocks <= 0) {
errorMsg("Bad skip value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "seek", 4) == 0) {
seekBlocks = getNum((strchr(*argv, '=')) + 1);
if (seekBlocks <= 0) {
errorMsg("Bad seek value %s\n", *argv);
goto usage;
}
} else {
goto usage;
}
argc--;
argv++;
}
buf = xmalloc(blockSize);
intotal = 0;
outTotal = 0;
if (inFile == NULL)
inFd = fileno(stdin);
else
inFd = open(inFile, 0);
if (inFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* free(buf); */
fatalError( inFile);
}
if (outFile == NULL)
outFd = fileno(stdout);
else
outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (outFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* close(inFd);
free(buf); */
fatalError( outFile);
}
lseek(inFd, skipBlocks * blockSize, SEEK_SET);
lseek(outFd, seekBlocks * blockSize, SEEK_SET);
while ((inCc = read(inFd, buf, sizeof(buf))) > 0) {
intotal +=inCc;
if ((outCc = fullWrite(outFd, buf, inCc)) < 0)
break;
outTotal += outCc;
}
/* Note that we are not freeing memory or closing
* files here, to save a few bytes. */
#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
close(outFd);
free(buf);
#endif
printf("%ld+%d records in\n", (long) (intotal / blockSize),
(intotal % blockSize) != 0);
printf("%ld+%d records out\n", (long) (outTotal / blockSize),
(outTotal % blockSize) != 0);
exit(TRUE);
usage:
usage(dd_usage);
}
|
