/*
* Mini dd implementation for busybox
*
- * Copyright (C) 1999, 2000 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
- * Based in part on code taken from sash.
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
- *
- * Permission to distribute this code under the GPL has been granted.
- *
- * 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
+ * Copyright (C) 2000,2001 Matt Kraai
*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-
-#include "internal.h"
-#include <features.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdlib.h>
#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
#include <fcntl.h>
-#include <errno.h>
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
-#include <inttypes.h>
-#else
-typedef unsigned long long int uintmax_t;
-#endif
-
-static const char dd_usage[] =
- "dd [if=FILE] [of=FILE] [bs=N] [count=N] [skip=N] [seek=N]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nCopy a file, converting and formatting according to options\n\n"
- "\tif=FILE\tread from FILE instead of stdin\n"
- "\tof=FILE\twrite to FILE instead of stdout\n"
- "\tbs=N\tread and write N bytes at a time\n"
- "\tcount=N\tcopy only N input blocks\n"
- "\tskip=N\tskip N input blocks\n"
- "\tseek=N\tskip N output blocks\n"
- "\n"
- "Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n"
-#endif
- ;
-
-
-
-extern int dd_main(int argc, char **argv)
+#include <signal.h> // For FEATURE_DD_SIGNAL_HANDLING
+#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 }
+};
+
+static size_t out_full;
+static size_t out_part;
+static size_t in_full;
+static size_t in_part;
+
+static void dd_output_status(int cur_signal)
{
- char *inFile = NULL;
- char *outFile = NULL;
- char *cp;
- int inFd;
- int outFd;
- int inCc = 0;
- int outCc;
- long blockSize = 512;
- uintmax_t skipBlocks = 0;
- uintmax_t seekBlocks = 0;
- uintmax_t count = (uintmax_t) - 1;
- uintmax_t intotal;
- uintmax_t outTotal;
- unsigned char *buf;
-
- argc--;
- argv++;
-
- /* Parse any options */
- while (argc) {
- if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
- inFile = ((strchr(*argv, '=')) + 1);
- else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
- outFile = ((strchr(*argv, '=')) + 1);
- else if (strncmp("count", *argv, 5) == 0) {
- count = getNum((strchr(*argv, '=')) + 1);
- if (count <= 0) {
- errorMsg("Bad count value %s\n", *argv);
- goto usage;
- }
- } else if (strncmp(*argv, "bs", 2) == 0) {
- blockSize = getNum((strchr(*argv, '=')) + 1);
- if (blockSize <= 0) {
- errorMsg("Bad block size value %s\n", *argv);
- goto usage;
- }
- } else if (strncmp(*argv, "skip", 4) == 0) {
- skipBlocks = getNum((strchr(*argv, '=')) + 1);
- if (skipBlocks <= 0) {
- errorMsg("Bad skip value %s\n", *argv);
- goto usage;
- }
+ fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
+ (long)in_full, (long)in_part,
+ (long)out_full, (long)out_part);
+}
+
+int dd_main(int argc, char **argv)
+{
+ size_t count = -1, oc = 0, ibs = 512, obs = 512;
+ ssize_t n;
+ off_t seek = 0, skip = 0;
+ int sync_flag = FALSE, noerror = FALSE, trunc_flag = TRUE, twobufs_flag = 0,
+ oflag, ifd, ofd, i;
+ const char *infile = NULL, *outfile = NULL;
+ char *ibuf, *obuf;
+
+ if (ENABLE_FEATURE_DD_SIGNAL_HANDLING)
+ {
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = dd_output_status;
+ sa.sa_flags = SA_RESTART;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGUSR1, &sa, 0);
+ }
- } else if (strncmp(*argv, "seek", 4) == 0) {
- seekBlocks = getNum((strchr(*argv, '=')) + 1);
- if (seekBlocks <= 0) {
- errorMsg("Bad seek value %s\n", *argv);
- goto usage;
+ for (i = 1; i < argc; i++) {
+ if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[i], 4)) {
+ ibs = bb_xparse_number(argv[i]+4, dd_suffixes);
+ twobufs_flag++;
+ } else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[i], 4)) {
+ obs = bb_xparse_number(argv[i]+4, dd_suffixes);
+ twobufs_flag++;
+ } else if (!strncmp("bs=", argv[i], 3)) {
+ ibs = obs = bb_xparse_number(argv[i]+3, dd_suffixes);
+ } else if (!strncmp("count=", argv[i], 6))
+ count = bb_xparse_number(argv[i]+6, dd_suffixes);
+ else if (!strncmp("seek=", argv[i], 5))
+ seek = bb_xparse_number(argv[i]+5, dd_suffixes);
+ else if (!strncmp("skip=", argv[i], 5))
+ skip = bb_xparse_number(argv[i]+5, dd_suffixes);
+ else if (!strncmp("if=", argv[i], 3))
+ infile = argv[i]+3;
+ else if (!strncmp("of=", argv[i], 3))
+ outfile = argv[i]+3;
+ else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[i], 5)) {
+ ibuf = argv[i]+5;
+ while (1) {
+ if (!strncmp("notrunc", ibuf, 7)) {
+ trunc_flag = FALSE;
+ ibuf += 7;
+ } else if (!strncmp("sync", ibuf, 4)) {
+ sync_flag = TRUE;
+ ibuf += 4;
+ } else if (!strncmp("noerror", ibuf, 7)) {
+ noerror = TRUE;
+ ibuf += 7;
+ } else {
+ bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5);
+ }
+ if (ibuf[0] == '\0') break;
+ if (ibuf[0] == ',') ibuf++;
}
+ } else
+ bb_show_usage();
+ }
+ ibuf = xmalloc(ibs);
- } else {
- goto usage;
- }
- argc--;
- argv++;
+ if (twobufs_flag) obuf = xmalloc(obs);
+ else obuf = ibuf;
+
+ if (infile != NULL) {
+ ifd = bb_xopen(infile, O_RDONLY);
+ } else {
+ ifd = STDIN_FILENO;
+ infile = bb_msg_standard_input;
}
- buf = xmalloc(blockSize);
+ if (outfile != NULL) {
+ oflag = O_WRONLY | O_CREAT;
- intotal = 0;
- outTotal = 0;
+ if (!seek && trunc_flag) {
+ oflag |= O_TRUNC;
+ }
- if (inFile == NULL)
- inFd = fileno(stdin);
- else
- inFd = open(inFile, 0);
+ ofd = bb_xopen3(outfile, oflag, 0666);
- if (inFd < 0) {
- /* Note that we are not freeing buf or closing
- * files here to save a few bytes. This exits
- * here anyways... */
+ if (seek && trunc_flag) {
+ if (ftruncate(ofd, seek * obs) < 0) {
+ struct stat st;
- /* free(buf); */
- fatalError( inFile);
+ 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 (outFile == NULL)
- outFd = fileno(stdout);
- else
- outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-
- if (outFd < 0) {
- /* Note that we are not freeing buf or closing
- * files here to save a few bytes. This exits
- * here anyways... */
+ if (skip) {
+ if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
+ while (skip-- > 0) {
+ n = safe_read(ifd, ibuf, ibs);
+ if (n < 0)
+ bb_perror_msg_and_die("%s", infile);
+ if (n == 0)
+ break;
+ }
+ }
+ }
- /* close(inFd);
- free(buf); */
- fatalError( outFile);
+ if (seek) {
+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
}
- lseek(inFd, skipBlocks * blockSize, SEEK_SET);
- lseek(outFd, seekBlocks * blockSize, SEEK_SET);
- //
- //TODO: Convert to using fullRead & fullWrite
- // from utility.c
- // -Erik
- while (outTotal < count * blockSize) {
- inCc = read(inFd, buf, blockSize);
- if (inCc < 0) {
- perror(inFile);
- goto cleanup;
- } else if (inCc == 0) {
- goto cleanup;
+ while (in_full + in_part != count) {
+ if (noerror) {
+ /* Pre-zero the buffer when doing the noerror thing */
+ memset(ibuf, '\0', ibs);
}
- intotal += inCc;
- cp = buf;
-
- while (intotal > outTotal) {
- if (outTotal + inCc > count * blockSize)
- inCc = count * blockSize - outTotal;
- outCc = write(outFd, cp, inCc);
- if (outCc < 0) {
- perror(outFile);
- goto cleanup;
- } else if (outCc == 0) {
- goto cleanup;
- }
- inCc -= outCc;
- cp += outCc;
- outTotal += outCc;
+ n = safe_read(ifd, ibuf, ibs);
+ if (n == 0) {
+ break;
+ }
+ if (n < 0) {
+ if (noerror) {
+ n = ibs;
+ bb_perror_msg("%s", infile);
+ } else {
+ bb_perror_msg_and_die("%s", infile);
+ }
+ }
+ if ((size_t)n == ibs) {
+ in_full++;
+ } else {
+ in_part++;
+ if (sync_flag) {
+ memset(ibuf + n, '\0', ibs - n);
+ n = ibs;
+ }
}
+ if (twobufs_flag) {
+ char *tmp = ibuf;
+ while (n) {
+ size_t d = obs - oc;
+
+ if (d > n) d = n;
+ memcpy(obuf + oc, tmp, d);
+ n -= d;
+ tmp += d;
+ oc += d;
+ if (oc == obs) {
+ if (bb_full_write(ofd, obuf, obs) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ out_full++;
+ oc = 0;
+ }
+ }
+ } else {
+ if ((n = bb_full_write(ofd, ibuf, n)) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ if (n == ibs) out_full++;
+ else out_part++;
+ }
+ }
+
+ if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
+ if (bb_full_write(ofd, obuf, oc) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ out_part++;
+ }
+ if (close (ifd) < 0) {
+ bb_perror_msg_and_die("%s", infile);
}
- if (inCc < 0)
- perror(inFile);
-
- cleanup:
- /* Note that we are not freeing memory or closing
- * files here, to save a few bytes. */
-#if 0
- close(inFd);
- close(outFd);
- free(buf);
-#endif
-
- printf("%ld+%d records in\n", (long) (intotal / blockSize),
- (intotal % blockSize) != 0);
- printf("%ld+%d records out\n", (long) (outTotal / blockSize),
- (outTotal % blockSize) != 0);
- exit(TRUE);
- usage:
-
- usage(dd_usage);
+ if (close (ofd) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+
+ dd_output_status(0);
+
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff