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224 lines
4.8 KiB
C
224 lines
4.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini dd implementation for busybox
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*
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*
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* Copyright (C) 2000,2001 Matt Kraai
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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#include <signal.h> /* For FEATURE_DD_SIGNAL_HANDLING */
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static const struct suffix_mult dd_suffixes[] = {
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{ "c", 1 },
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{ "w", 2 },
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{ "b", 512 },
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{ "kD", 1000 },
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{ "k", 1024 },
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{ "K", 1024 }, // compat with coreutils dd
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{ "MD", 1000000 },
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{ "M", 1048576 },
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{ "GD", 1000000000 },
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{ "G", 1073741824 },
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{ NULL, 0 }
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};
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static off_t out_full, out_part, in_full, in_part;
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static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
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{
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bb_fprintf(stderr, OFF_FMT"+"OFF_FMT" records in\n"
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OFF_FMT"+"OFF_FMT" records out\n",
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in_full, in_part,
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out_full, out_part);
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}
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int dd_main(int argc, char **argv)
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{
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#define sync_flag (1<<0)
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#define noerror (1<<1)
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#define trunc_flag (1<<2)
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#define twobufs_flag (1<<3)
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int flags = trunc_flag;
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size_t oc = 0, ibs = 512, obs = 512;
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ssize_t n;
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off_t seek = 0, skip = 0, count = OFF_T_MAX;
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int oflag, ifd, ofd;
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const char *infile = NULL, *outfile = NULL;
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char *ibuf, *obuf;
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if (ENABLE_FEATURE_DD_SIGNAL_HANDLING) {
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = dd_output_status;
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sa.sa_flags = SA_RESTART;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGUSR1, &sa, 0);
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}
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for (n = 1; n < argc; n++) {
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// FIXME: make them capable of eating LARGE numbers
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if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[n], 4)) {
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ibs = xatoul_sfx(argv[n]+4, dd_suffixes);
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flags |= twobufs_flag;
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} else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[n], 4)) {
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obs = xatoul_sfx(argv[n]+4, dd_suffixes);
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flags |= twobufs_flag;
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} else if (!strncmp("bs=", argv[n], 3))
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ibs = obs = xatoul_sfx(argv[n]+3, dd_suffixes);
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else if (!strncmp("count=", argv[n], 6))
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count = xatoul_sfx(argv[n]+6, dd_suffixes);
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else if (!strncmp("seek=", argv[n], 5))
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seek = xatoul_sfx(argv[n]+5, dd_suffixes);
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else if (!strncmp("skip=", argv[n], 5))
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skip = xatoul_sfx(argv[n]+5, dd_suffixes);
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else if (!strncmp("if=", argv[n], 3))
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infile = argv[n]+3;
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else if (!strncmp("of=", argv[n], 3))
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outfile = argv[n]+3;
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else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[n], 5)) {
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ibuf = argv[n]+5;
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while (1) {
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if (!strncmp("notrunc", ibuf, 7)) {
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flags &= ~trunc_flag;
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ibuf += 7;
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} else if (!strncmp("sync", ibuf, 4)) {
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flags |= sync_flag;
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ibuf += 4;
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} else if (!strncmp("noerror", ibuf, 7)) {
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flags |= noerror;
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ibuf += 7;
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} else {
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bb_error_msg_and_die(bb_msg_invalid_arg, argv[n]+5, "conv");
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}
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if (ibuf[0] == '\0') break;
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if (ibuf[0] == ',') ibuf++;
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}
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} else
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bb_show_usage();
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}
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ibuf = xmalloc(ibs);
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if (flags & twobufs_flag)
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obuf = xmalloc(obs);
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else
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obuf = ibuf;
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if (infile != NULL)
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ifd = xopen(infile, O_RDONLY);
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else {
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ifd = STDIN_FILENO;
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infile = bb_msg_standard_input;
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}
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if (outfile != NULL) {
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oflag = O_WRONLY | O_CREAT;
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if (!seek && (flags & trunc_flag))
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oflag |= O_TRUNC;
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ofd = xopen3(outfile, oflag, 0666);
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if (seek && (flags & trunc_flag)) {
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if (ftruncate(ofd, seek * obs) < 0) {
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struct stat st;
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if (fstat(ofd, &st) < 0 || S_ISREG(st.st_mode) ||
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S_ISDIR(st.st_mode))
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goto die_outfile;
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}
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}
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} else {
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ofd = STDOUT_FILENO;
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outfile = bb_msg_standard_output;
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}
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if (skip) {
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if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
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while (skip-- > 0) {
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n = safe_read(ifd, ibuf, ibs);
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if (n < 0)
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bb_perror_msg_and_die("%s", infile);
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if (n == 0)
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break;
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}
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}
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}
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if (seek) {
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if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
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goto die_outfile;
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}
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while (in_full + in_part != count) {
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if (flags & noerror) {
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/* Pre-zero the buffer when doing the noerror thing */
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memset(ibuf, '\0', ibs);
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}
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n = safe_read(ifd, ibuf, ibs);
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if (n == 0)
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break;
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if (n < 0) {
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if (flags & noerror) {
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n = ibs;
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bb_perror_msg("%s", infile);
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} else
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bb_perror_msg_and_die("%s", infile);
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}
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if ((size_t)n == ibs)
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in_full++;
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else {
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in_part++;
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if (sync_flag) {
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memset(ibuf + n, '\0', ibs - n);
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n = ibs;
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}
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}
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if (flags & twobufs_flag) {
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char *tmp = ibuf;
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while (n) {
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size_t d = obs - oc;
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if (d > n)
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d = n;
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memcpy(obuf + oc, tmp, d);
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n -= d;
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tmp += d;
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oc += d;
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if (oc == obs) {
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xwrite(ofd, obuf, obs);
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out_full++;
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oc = 0;
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}
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}
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} else {
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xwrite(ofd, ibuf, n);
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if (n == ibs)
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out_full++;
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else
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out_part++;
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}
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}
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if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
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xwrite(ofd, obuf, oc);
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out_part++;
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}
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if (close (ifd) < 0) {
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bb_perror_msg_and_die("%s", infile);
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}
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if (close (ofd) < 0) {
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die_outfile:
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bb_perror_msg_and_die("%s", outfile);
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}
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dd_output_status(0);
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return EXIT_SUCCESS;
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}
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