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;
56 uintmax_t inTotal = 0;
57 uintmax_t outTotal = 0;
60 unsigned char buf[BUFSIZ];
66 /* Parse any options */
68 if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
69 inFile = ((strchr(*argv, '=')) + 1);
70 else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
71 outFile = ((strchr(*argv, '=')) + 1);
72 else if (strncmp("count", *argv, 5) == 0) {
73 count = getNum((strchr(*argv, '=')) + 1);
75 errorMsg("Bad count value %s\n", *argv);
78 } else if (strncmp(*argv, "bs", 2) == 0) {
79 blockSize = getNum((strchr(*argv, '=')) + 1);
81 errorMsg("Bad block size value %s\n", *argv);
84 } else if (strncmp(*argv, "skip", 4) == 0) {
85 skipBlocks = getNum((strchr(*argv, '=')) + 1);
86 if (skipBlocks <= 0) {
87 errorMsg("Bad skip value %s\n", *argv);
91 } else if (strncmp(*argv, "seek", 4) == 0) {
92 seekBlocks = getNum((strchr(*argv, '=')) + 1);
93 if (seekBlocks <= 0) {
94 errorMsg("Bad seek value %s\n", *argv);
97 } else if (strncmp(*argv, "conv", 4) == 0) {
98 keyword = (strchr(*argv, '=') + 1);
99 if (strcmp(keyword, "notrunc") == 0)
109 inFd = fileno(stdin);
111 inFd = open(inFile, 0);
114 /* Note that we are not freeing buf or closing
115 * files here to save a few bytes. This exits
123 outFd = fileno(stdout);
125 outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
128 /* Note that we are not freeing buf or closing
129 * files here to save a few bytes. This exits
134 fatalError( outFile);
137 lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
138 lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
139 totalSize=count*blockSize;
140 while ((readSize = totalSize - inTotal) > 0) {
141 if (readSize > BUFSIZ)
143 inCc = fullRead(inFd, buf, readSize);
145 if ((outCc = fullWrite(outFd, buf, inCc)) < 1)
150 ftruncate(outFd, lseek(outFd, 0, SEEK_CUR));
152 /* Note that we are not freeing memory or closing
153 * files here, to save a few bytes. */
154 #ifdef BB_FEATURE_CLEAN_UP
159 printf("%ld+%d records in\n", (long) (inTotal / blockSize),
160 (inTotal % blockSize) != 0);
161 printf("%ld+%d records out\n", (long) (outTotal / blockSize),
162 (outTotal % blockSize) != 0);