aboutsummaryrefslogtreecommitdiff
path: root/coreutils/dd.c
blob: bc01eedbfaab9e4dfc5df26387ac05ae3dcdc3b9 (plain)
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
/*
 * Mini dd implementation for busybox
 *
 * Copyright (C) 1999 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

static const char dd_usage[] =
"dd [if=name] [of=name] [bs=n] [count=n]\n\n"
"Copy a file, converting and formatting according to options\n\n"
"\tif=FILE\tread from FILE instead of stdin\n"
"\tof=FILE\twrite to FILE instead of stout\n"
"\tbs=n\tread and write N BYTES at a time\n"
"\tcount=n\tcopy only n input blocks\n"
//"\tskip=n\tskip n input blocks\n"
"\n"
"BYTES may be suffixed by w (x2), k (x1024), b (x512), or m (x1024^2).\n";



extern int dd_main (int argc, char **argv)
{
    const char *inFile = NULL;
    const char *outFile = NULL;
    char *cp;
    int inFd;
    int outFd;
    int inCc = 0;
    int outCc;
    size_t blockSize = 512;
    //uintmax_t skipBlocks = 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) {
		fprintf (stderr, "Bad count value %s\n", *argv);
		goto usage;
	    }
	}
	else if (strncmp(*argv, "bs", 2) == 0) {
	    blockSize = getNum ((strchr(*argv, '='))+1);
	    if (blockSize <= 0) {
		fprintf (stderr, "Bad block size value %s\n", *argv);
		goto usage;
	    }
	}
#if 0
	else if (strncmp(*argv, "skip", 4) == 0) {
	    skipBlocks = atoi( *argv); 
	    if (skipBlocks <= 0) {
		fprintf (stderr, "Bad skip value %d\n", skipBlocks);
		goto usage;
	    }

	}
#endif
	else {
	    goto usage;
	}
	argc--;
	argv++;
    }

    buf = malloc (blockSize);
    if (buf == NULL) {
	fprintf (stderr, "Cannot allocate buffer\n");
	exit( FALSE);
    }

    intotal = 0;
    outTotal = 0;

    if (inFile == NULL)
	inFd = fileno(stdin);
    else
	inFd = open (inFile, 0);

    if (inFd < 0) {
	perror (inFile);
	free (buf);
	exit( FALSE);
    }

    if (outFile == NULL)
	outFd = fileno(stdout);
    else
	outFd = creat (outFile, 0666);

    if (outFd < 0) {
	perror (outFile);
	close (inFd);
	free (buf);
	exit( FALSE);
    }

    //lseek(inFd, skipBlocks*blockSize, SEEK_SET);
    //
    //TODO: Convert to using fullRead & fullWrite
    // from utilitity.c
    //  -Erik
    while (outTotal < count * blockSize) {
	inCc = read (inFd, buf, blockSize);
	if (inCc < 0) {
	    perror (inFile);
	    goto cleanup;
	} else if (inCc == 0) {
	    goto cleanup;
	}
	intotal += inCc;
	cp = buf;

	while (intotal > outTotal) {
	    if (outTotal + inCc > count * blockSize)
		inCc = count * blockSize - outTotal;
	    outCc = write (outFd, cp, inCc);
	    if (outCc < 0) {
		perror (outFile);
		goto cleanup;
	    } else if (outCc == 0) {
		goto cleanup;
	    }

	    inCc -= outCc;
	    cp += outCc;
	    outTotal += outCc;
	}
    }

    if (inCc < 0)
	perror (inFile);

  cleanup:
    close (inFd);
    close (outFd);
    free (buf);

    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);
}