diff options
Diffstat (limited to 'busybox/coreutils/dd.c')
| -rw-r--r-- | busybox/coreutils/dd.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/busybox/coreutils/dd.c b/busybox/coreutils/dd.c new file mode 100644 index 0000000..9a149e2 --- /dev/null +++ b/busybox/coreutils/dd.c @@ -0,0 +1,203 @@ +/* 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; +} |