diff options
Diffstat (limited to 'dd.c')
| -rw-r--r-- | dd.c | 154 |
1 files changed, 0 insertions, 154 deletions
@@ -1,154 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * Mini dd implementation for busybox - * - * - * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu> - * - * 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 <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) -{ - int i, ifd, ofd, oflag, sync_flag = FALSE, trunc = TRUE; - size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0; - size_t bs = 512, count = -1; - ssize_t n; - off_t seek = 0, skip = 0; - char *infile = NULL, *outfile = NULL, *buf; - - for (i = 1; i < argc; i++) { - if (strncmp("bs=", argv[i], 3) == 0) - bs = parse_number(argv[i]+3, dd_suffixes); - else if (strncmp("count=", argv[i], 6) == 0) - count = parse_number(argv[i]+6, dd_suffixes); - else if (strncmp("seek=", argv[i], 5) == 0) - seek = parse_number(argv[i]+5, dd_suffixes); - else if (strncmp("skip=", argv[i], 5) == 0) - skip = parse_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 = FALSE; - buf += 7; - } else if (strncmp("sync", buf, 4) == 0) { - sync_flag = TRUE; - buf += 4; - } else { - error_msg_and_die("invalid conversion `%s'", argv[i]+5); - } - if (buf[0] == '\0') - break; - if (buf[0] == ',') - buf++; - } - } else - show_usage(); - } - - buf = xmalloc(bs); - - if (infile != NULL) { - if ((ifd = open(infile, O_RDONLY)) < 0) - perror_msg_and_die("%s", infile); - } else { - ifd = STDIN_FILENO; - infile = "standard input"; - } - - if (outfile != NULL) { - oflag = O_WRONLY | O_CREAT; - - if (!seek && trunc) - oflag |= O_TRUNC; - - if ((ofd = open(outfile, oflag, 0666)) < 0) - perror_msg_and_die("%s", outfile); - - if (seek && trunc) { - if (ftruncate(ofd, seek * bs) < 0) - perror_msg_and_die("%s", outfile); - } - } else { - ofd = STDOUT_FILENO; - outfile = "standard output"; - } - - if (skip) { - if (lseek(ifd, skip * bs, SEEK_CUR) < 0) - perror_msg_and_die("%s", infile); - } - - if (seek) { - if (lseek(ofd, seek * bs, SEEK_CUR) < 0) - perror_msg_and_die("%s", outfile); - } - - while (in_full + in_part != count) { - n = safe_read(ifd, buf, bs); - if (n < 0) - 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 = full_write(ofd, buf, n); - if (n < 0) - perror_msg_and_die("%s", outfile); - if (n == bs) - out_full++; - else - out_part++; - } - - fprintf(stderr, "%ld+%ld records in\n", (long)in_full, (long)in_part); - fprintf(stderr, "%ld+%ld records out\n", (long)out_full, (long)out_part); - - return EXIT_SUCCESS; -} |