1 /* vi: set sw=4 ts=4: */
3 * Mini dd implementation for busybox
5 * Copyright (C) 1999, 2000 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8 * Based in part on code taken from sash.
9 * Copyright (c) 1999 by David I. Bell
10 * Permission is granted to use, distribute, or modify this source,
11 * provided that this copyright notice remains intact.
13 * Permission to distribute this code under the GPL has been granted.
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
37 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
40 typedef unsigned long long int uintmax_t;
43 extern int dd_main(int argc, char **argv)
53 uintmax_t skipBlocks = 0;
54 uintmax_t seekBlocks = 0;
55 uintmax_t count = (uintmax_t) - 1;
63 /* Parse any options */
65 if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
66 inFile = ((strchr(*argv, '=')) + 1);
67 else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
68 outFile = ((strchr(*argv, '=')) + 1);
69 else if (strncmp("count", *argv, 5) == 0) {
70 count = getNum((strchr(*argv, '=')) + 1);
72 errorMsg("Bad count value %s\n", *argv);
75 } else if (strncmp(*argv, "bs", 2) == 0) {
76 blockSize = getNum((strchr(*argv, '=')) + 1);
78 errorMsg("Bad block size value %s\n", *argv);
81 } else if (strncmp(*argv, "skip", 4) == 0) {
82 skipBlocks = getNum((strchr(*argv, '=')) + 1);
83 if (skipBlocks <= 0) {
84 errorMsg("Bad skip value %s\n", *argv);
88 } else if (strncmp(*argv, "seek", 4) == 0) {
89 seekBlocks = getNum((strchr(*argv, '=')) + 1);
90 if (seekBlocks <= 0) {
91 errorMsg("Bad seek value %s\n", *argv);
102 buf = xmalloc(blockSize);
108 inFd = fileno(stdin);
110 inFd = open(inFile, 0);
113 /* Note that we are not freeing buf or closing
114 * files here to save a few bytes. This exits
122 outFd = fileno(stdout);
124 outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
127 /* Note that we are not freeing buf or closing
128 * files here to save a few bytes. This exits
133 fatalError( outFile);
136 lseek(inFd, skipBlocks * blockSize, SEEK_SET);
137 lseek(outFd, seekBlocks * blockSize, SEEK_SET);
139 //TODO: Convert to using fullRead & fullWrite
142 while (outTotal < count * blockSize) {
143 inCc = read(inFd, buf, blockSize);
147 } else if (inCc == 0) {
153 while (intotal > outTotal) {
154 if (outTotal + inCc > count * blockSize)
155 inCc = count * blockSize - outTotal;
156 outCc = write(outFd, cp, inCc);
160 } else if (outCc == 0) {
174 /* Note that we are not freeing memory or closing
175 * files here, to save a few bytes. */
182 printf("%ld+%d records in\n", (long) (intotal / blockSize),
183 (intotal % blockSize) != 0);
184 printf("%ld+%d records out\n", (long) (outTotal / blockSize),
185 (outTotal % blockSize) != 0);