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- /* vi: set sw=4 ts=4: */
- /*
- * Mini dd implementation for busybox
- *
- *
- * Copyright (C) 2000,2001 Matt Kraai
- *
- * 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 <sys/types.h>
- #include <sys/stat.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <string.h>
- #include <fcntl.h>
- #include "busybox.h"
- static const struct suffix_mult dd_suffixes[] = {
- { "c", 1 },
- { "w", 2 },
- { "b", 512 },
- { "kD", 1000 },
- { "k", 1024 },
- { "MD", 1000000 },
- { "M", 1048576 },
- { "GD", 1000000000 },
- { "G", 1073741824 },
- { NULL, 0 }
- };
- int dd_main(int argc, char **argv)
- {
- size_t out_full = 0;
- size_t out_part = 0;
- size_t in_full = 0;
- size_t in_part = 0;
- size_t count = -1;
- size_t bs = 512;
- ssize_t n;
- off_t seek = 0;
- off_t skip = 0;
- int sync_flag = FALSE;
- int noerror = FALSE;
- int trunc_flag = TRUE;
- int oflag;
- int ifd;
- int ofd;
- int i;
- const char *infile = NULL;
- const char *outfile = NULL;
- char *buf;
- for (i = 1; i < argc; i++) {
- if (strncmp("bs=", argv[i], 3) == 0)
- bs = bb_xparse_number(argv[i]+3, dd_suffixes);
- else if (strncmp("count=", argv[i], 6) == 0)
- count = bb_xparse_number(argv[i]+6, dd_suffixes);
- else if (strncmp("seek=", argv[i], 5) == 0)
- seek = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (strncmp("skip=", argv[i], 5) == 0)
- skip = bb_xparse_number(argv[i]+5, dd_suffixes);
- else if (strncmp("if=", argv[i], 3) == 0)
- infile = argv[i]+3;
- else if (strncmp("of=", argv[i], 3) == 0)
- outfile = argv[i]+3;
- else if (strncmp("conv=", argv[i], 5) == 0) {
- buf = argv[i]+5;
- while (1) {
- if (strncmp("notrunc", buf, 7) == 0) {
- trunc_flag = FALSE;
- buf += 7;
- } else if (strncmp("sync", buf, 4) == 0) {
- sync_flag = TRUE;
- buf += 4;
- } else if (strncmp("noerror", buf, 7) == 0) {
- noerror = TRUE;
- buf += 7;
- } else {
- bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5);
- }
- if (buf[0] == '\0')
- break;
- if (buf[0] == ',')
- buf++;
- }
- } else
- bb_show_usage();
- }
- buf = xmalloc(bs);
- if (infile != NULL) {
- ifd = bb_xopen(infile, O_RDONLY);
- } else {
- ifd = STDIN_FILENO;
- infile = bb_msg_standard_input;
- }
- if (outfile != NULL) {
- oflag = O_WRONLY | O_CREAT;
- if (!seek && trunc_flag) {
- oflag |= O_TRUNC;
- }
- if ((ofd = open(outfile, oflag, 0666)) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
- if (seek && trunc_flag) {
- if (ftruncate(ofd, seek * bs) < 0) {
- struct stat st;
- if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
- S_ISDIR (st.st_mode)) {
- bb_perror_msg_and_die("%s", outfile);
- }
- }
- }
- } else {
- ofd = STDOUT_FILENO;
- outfile = bb_msg_standard_output;
- }
- if (skip) {
- if (lseek(ifd, skip * bs, SEEK_CUR) < 0) {
- bb_perror_msg_and_die("%s", infile);
- }
- }
- if (seek) {
- if (lseek(ofd, seek * bs, SEEK_CUR) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
- }
- while (in_full + in_part != count) {
- if (noerror) {
- /* Pre-zero the buffer when doing the noerror thing */
- memset(buf, '\0', bs);
- }
- n = safe_read(ifd, buf, bs);
- if (n < 0) {
- if (noerror) {
- n = bs;
- bb_perror_msg("%s", infile);
- } else {
- bb_perror_msg_and_die("%s", infile);
- }
- }
- if (n == 0) {
- break;
- }
- if (n == bs) {
- in_full++;
- } else {
- in_part++;
- }
- if (sync_flag) {
- memset(buf + n, '\0', bs - n);
- n = bs;
- }
- n = bb_full_write(ofd, buf, n);
- if (n < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
- if (n == bs) {
- out_full++;
- } else {
- out_part++;
- }
- }
- if (close (ifd) < 0) {
- bb_perror_msg_and_die("%s", infile);
- }
- if (close (ofd) < 0) {
- bb_perror_msg_and_die("%s", outfile);
- }
- fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
- (long)in_full, (long)in_part,
- (long)out_full, (long)out_part);
- return EXIT_SUCCESS;
- }
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