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)
52 uintmax_t skipBlocks = 0;
53 uintmax_t seekBlocks = 0;
54 uintmax_t count = (uintmax_t) - 1;
55 uintmax_t inTotal = 0;
56 uintmax_t outTotal = 0;
59 unsigned char buf[BUFSIZ];
64 /* Parse any options */
66 if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
67 inFile = ((strchr(*argv, '=')) + 1);
68 else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
69 outFile = ((strchr(*argv, '=')) + 1);
70 else if (strncmp("count", *argv, 5) == 0) {
71 count = getNum((strchr(*argv, '=')) + 1);
73 errorMsg("Bad count value %s\n", *argv);
76 } else if (strncmp(*argv, "bs", 2) == 0) {
77 blockSize = getNum((strchr(*argv, '=')) + 1);
79 errorMsg("Bad block size value %s\n", *argv);
82 } else if (strncmp(*argv, "skip", 4) == 0) {
83 skipBlocks = getNum((strchr(*argv, '=')) + 1);
84 if (skipBlocks <= 0) {
85 errorMsg("Bad skip value %s\n", *argv);
89 } else if (strncmp(*argv, "seek", 4) == 0) {
90 seekBlocks = getNum((strchr(*argv, '=')) + 1);
91 if (seekBlocks <= 0) {
92 errorMsg("Bad seek value %s\n", *argv);
104 inFd = fileno(stdin);
106 inFd = open(inFile, 0);
109 /* Note that we are not freeing buf or closing
110 * files here to save a few bytes. This exits
118 outFd = fileno(stdout);
120 outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
123 /* Note that we are not freeing buf or closing
124 * files here to save a few bytes. This exits
129 fatalError( outFile);
132 lseek(inFd, skipBlocks * blockSize, SEEK_SET);
133 lseek(outFd, seekBlocks * blockSize, SEEK_SET);
134 totalSize=count*blockSize;
135 printf("totalsize is %d\n",(int) totalSize);
136 while ((readSize = totalSize - inTotal) > 0) {
137 if (readSize > BUFSIZ)
139 inCc = read(inFd, buf, readSize);
141 if ((outCc = fullWrite(outFd, buf, inCc)) < 0)
146 /* Note that we are not freeing memory or closing
147 * files here, to save a few bytes. */
148 #ifdef BB_FEATURE_CLEAN_UP
154 printf("%ld+%d records in\n", (long) (inTotal / blockSize),
155 (inTotal % blockSize) != 0);
156 printf("%ld+%d records out\n", (long) (outTotal / blockSize),
157 (outTotal % blockSize) != 0);