/*
* 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 "busybox.h"
+#include <signal.h> /* For FEATURE_DD_SIGNAL_HANDLING */
+
+static const struct suffix_mult dd_suffixes[] = {
+ { "c", 1 },
+ { "w", 2 },
+ { "b", 512 },
+ { "kD", 1000 },
+ { "k", 1024 },
+ { "K", 1024 }, /* compat with coreutils dd */
+ { "MD", 1000000 },
+ { "M", 1048576 },
+ { "GD", 1000000000 },
+ { "G", 1073741824 },
+ { NULL, 0 }
+};
+
+struct globals {
+ off_t out_full, out_part, in_full, in_part;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+
+static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
+{
+ fprintf(stderr, "%"OFF_FMT"d+%"OFF_FMT"d records in\n"
+ "%"OFF_FMT"d+%"OFF_FMT"d records out\n",
+ G.in_full, G.in_part,
+ G.out_full, G.out_part);
+}
+
+static ssize_t full_write_or_warn(int fd, const void *buf, size_t len,
+ const char * const filename)
+{
+ ssize_t n = full_write(fd, buf, len);
+ if (n < 0)
+ bb_perror_msg("writing '%s'", filename);
+ return n;
+}
+
+static bool write_and_stats(int fd, const void *buf, size_t len, size_t obs,
+ const char * const filename)
+{
+ ssize_t n = full_write_or_warn(fd, buf, len, filename);
+ if (n < 0)
+ return 1;
+ if (n == obs)
+ G.out_full++;
+ else if (n > 0)
+ G.out_part++;
+ return 0;
+}
-#include "internal.h"
-#include <features.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <errno.h>
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
-#include <inttypes.h>
+#if ENABLE_LFS
+#define XATOU_SFX xatoull_sfx
#else
-typedef unsigned long long int uintmax_t;
+#define XATOU_SFX xatoul_sfx
#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"
+int dd_main(int argc, char **argv);
+int dd_main(int argc, char **argv)
+{
+ enum {
+ sync_flag = 1 << 0,
+ noerror = 1 << 1,
+ trunc_flag = 1 << 2,
+ twobufs_flag = 1 << 3,
+ };
+ const char * const keywords[] = {
+ "bs=", "count=", "seek=", "skip=", "if=", "of=",
+#if ENABLE_FEATURE_DD_IBS_OBS
+ "ibs=", "obs=", "conv=", "notrunc", "sync", "noerror",
#endif
- ;
+ NULL
+ };
+#define OP_bs 0 + 1
+#define OP_count OP_bs + 1
+#define OP_seek OP_count + 1
+#define OP_skip OP_seek + 1
+#define OP_if OP_skip + 1
+#define OP_of OP_if + 1
+#define OP_ibs OP_of + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_obs OP_ibs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv OP_obs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_notrunc OP_conv + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_sync OP_conv_notrunc + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_noerror OP_conv_sync + ENABLE_FEATURE_DD_IBS_OBS
+ int flags = trunc_flag;
+ size_t oc = 0, ibs = 512, obs = 512;
+ ssize_t n, w;
+ off_t seek = 0, skip = 0, count = OFF_T_MAX;
+ int ifd, ofd;
+ const char *infile = NULL, *outfile = NULL;
+ char *ibuf, *obuf;
+ if (ENABLE_FEATURE_DD_SIGNAL_HANDLING) {
+ struct sigaction sa;
-extern int dd_main(int argc, char **argv)
-{
- 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;
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = dd_output_status;
+ sa.sa_flags = SA_RESTART;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGUSR1, &sa, 0);
+ }
+
+ for (n = 1; n < argc; n++) {
+ smalluint key_len, what;
+ char *key;
+ char *arg = argv[n];
+
+//XXX:FIXME: we reject plain "dd --" This would cost ~20 bytes, so..
+//if (*arg == '-' && *++arg == '-' && !*++arg) continue;
+ key = strstr(arg, "=");
+ if (key == NULL)
+ bb_show_usage();
+ key_len = key - arg + 1;
+ key = xstrndup(arg, key_len);
+ what = index_in_str_array(keywords, key) + 1;
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(key);
+ if (what == 0)
+ bb_show_usage();
+ arg += key_len;
+ /* Must fit into positive ssize_t */
+ if (ENABLE_FEATURE_DD_IBS_OBS) {
+ if (what == OP_ibs) {
+ ibs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
}
- } else if (strncmp(*argv, "skip", 4) == 0) {
- skipBlocks = getNum((strchr(*argv, '=')) + 1);
- if (skipBlocks <= 0) {
- errorMsg("Bad skip value %s\n", *argv);
- goto usage;
+ if (what == OP_obs) {
+ obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
}
-
- } else if (strncmp(*argv, "seek", 4) == 0) {
- seekBlocks = getNum((strchr(*argv, '=')) + 1);
- if (seekBlocks <= 0) {
- errorMsg("Bad seek value %s\n", *argv);
- goto usage;
+ if (what == OP_conv) {
+ while (1) {
+ /* find ',', replace them with nil so we can use arg for
+ * index_in_str_array without copying.
+ * We rely on arg being non-null, else strstr would fault.
+ */
+ key = strstr(arg, ",");
+ if (key)
+ *key = '\0';
+ what = index_in_str_array(keywords, arg) + 1;
+ if (what < OP_conv_notrunc)
+ bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
+ if (what == OP_conv_notrunc)
+ flags &= ~trunc_flag;
+ if (what == OP_conv_sync)
+ flags |= sync_flag;
+ if (what == OP_conv_noerror)
+ flags |= noerror;
+ if (!key) /* no ',' left, so this was the last specifier */
+ break;
+ arg += key - arg + 1; /* skip this keyword plus ',' */
+ }
+ continue;
}
-
- } else {
- goto usage;
}
- argc--;
- argv++;
+ if (what == OP_bs) {
+ ibs = obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
+ }
+ /* These can be large: */
+ if (what == OP_count) {
+ count = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == OP_seek) {
+ seek = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == skip) {
+ skip = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == OP_if) {
+ infile = arg;
+ continue;
+ }
+ if (what == OP_of)
+ outfile = arg;
}
+//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
+ ibuf = obuf = xmalloc(ibs);
+ if (ibs != obs) {
+ flags |= twobufs_flag;
+ obuf = xmalloc(obs);
+ }
+ if (infile != NULL)
+ ifd = xopen(infile, O_RDONLY);
+ else {
+ ifd = STDIN_FILENO;
+ infile = bb_msg_standard_input;
+ }
+ if (outfile != NULL) {
+ int oflag = O_WRONLY | O_CREAT;
- buf = xmalloc(blockSize);
-
- intotal = 0;
- outTotal = 0;
+ if (!seek && (flags & trunc_flag))
+ oflag |= O_TRUNC;
- if (inFile == NULL)
- inFd = fileno(stdin);
- else
- inFd = open(inFile, 0);
+ ofd = xopen(outfile, oflag);
- 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 && (flags & 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))
+ goto die_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... */
-
- /* close(inFd);
- free(buf); */
- fatalError( outFile);
+ if (skip) {
+ if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
+ while (skip-- > 0) {
+ n = safe_read(ifd, ibuf, ibs);
+ if (n < 0)
+ goto die_infile;
+ if (n == 0)
+ break;
+ }
+ }
+ }
+ if (seek) {
+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
+ goto die_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 (G.in_full + G.in_part != count) {
+ if (flags & noerror) /* Pre-zero the buffer when for noerror */
+ memset(ibuf, '\0', ibs);
+ n = safe_read(ifd, ibuf, ibs);
+ if (n == 0)
+ break;
+ if (n < 0) {
+ if (flags & noerror) {
+ n = ibs;
+ bb_perror_msg("%s", infile);
+ } else
+ goto die_infile;
}
- 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;
+ if ((size_t)n == ibs)
+ G.in_full++;
+ else {
+ G.in_part++;
+ if (flags & sync_flag) {
+ memset(ibuf + n, '\0', ibs - n);
+ n = ibs;
}
-
- inCc -= outCc;
- cp += outCc;
- outTotal += outCc;
}
- }
+ if (flags & twobufs_flag) {
+ char *tmp = ibuf;
+ while (n) {
+ size_t d = obs - oc;
- if (inCc < 0)
- perror(inFile);
+ if (d > n)
+ d = n;
+ memcpy(obuf + oc, tmp, d);
+ n -= d;
+ tmp += d;
+ oc += d;
+ if (oc == obs) {
+ if (write_and_stats(ofd, obuf, obs, obs, outfile))
+ goto out_status;
+ oc = 0;
+ }
+ }
+ } else
+ if (write_and_stats(ofd, ibuf, n, obs, outfile))
+ goto out_status;
+ }
- 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
+ if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
+ w = full_write_or_warn(ofd, obuf, oc, outfile);
+ if (w < 0) goto out_status;
+ if (w > 0)
+ G.out_part++;
+ }
+ if (close(ifd) < 0) {
+die_infile:
+ bb_perror_msg_and_die("%s", infile);
+ }
- 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:
+ if (close(ofd) < 0) {
+die_outfile:
+ bb_perror_msg_and_die("%s", outfile);
+ }
+out_status:
+ dd_output_status(0);
- usage(dd_usage);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff