1 /* vi: set sw=4 ts=4: */
3 * Mini dd implementation for busybox
6 * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <sys/types.h>
29 static struct suffix_mult dd_suffixes[] = {
42 int dd_main(int argc, char **argv)
44 int i, ifd, ofd, sync = FALSE, trunc = TRUE;
45 size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
46 size_t bs = 512, count = -1;
48 off_t seek = 0, skip = 0;
50 char *infile = NULL, *outfile = NULL, *buf;
52 for (i = 1; i < argc; i++) {
53 if (strncmp("bs=", argv[i], 3) == 0)
54 bs = parse_number(argv[i]+3, dd_suffixes);
55 else if (strncmp("count=", argv[i], 6) == 0)
56 count = parse_number(argv[i]+6, dd_suffixes);
57 else if (strncmp("seek=", argv[i], 5) == 0)
58 seek = parse_number(argv[i]+5, dd_suffixes);
59 else if (strncmp("skip=", argv[i], 5) == 0)
60 skip = parse_number(argv[i]+5, dd_suffixes);
61 else if (strncmp("if=", argv[i], 3) == 0)
63 else if (strncmp("of=", argv[i], 3) == 0)
65 else if (strncmp("conv=", argv[i], 5) == 0) {
68 if (strncmp("notrunc", buf, 7) == 0) {
71 } else if (strncmp("sync", buf, 4) == 0) {
75 error_msg_and_die("invalid conversion `%s'\n", argv[i]+5);
89 if ((ifd = open(infile, O_RDONLY)) < 0)
90 perror_msg_and_die("%s", infile);
93 infile = "standard input";
96 if (outfile != NULL) {
97 if ((ofd = open(outfile, O_WRONLY | O_CREAT, 0666)) < 0)
98 perror_msg_and_die("%s", outfile);
102 outfile = "standard output";
107 if (lseek(ifd, skip * bs, SEEK_CUR) < 0)
108 perror_msg_and_die("%s", infile);
112 if (lseek(ofd, seek * bs, SEEK_CUR) < 0)
113 perror_msg_and_die("%s", outfile);
117 if (ftruncate(ofd, seek * bs) < 0)
118 perror_msg_and_die("%s", outfile);
121 while (in_full + in_part != count) {
122 n = safe_read(ifd, buf, bs);
124 perror_msg_and_die("%s", infile);
132 memset(buf + n, '\0', bs - n);
135 n = full_write(ofd, buf, n);
137 perror_msg_and_die("%s", outfile);
144 fprintf(statusfp, "%d+%d records in\n", in_full, in_part);
145 fprintf(statusfp, "%d+%d records out\n", out_full, out_part);