408 lines
10 KiB
C
408 lines
10 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Keith Muller of the University of California, San Diego and Lance
|
|
* Visser of Convex Computer Corporation.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Id: dd.c,v 1.2 1994/09/24 02:54:52 davidg Exp $
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char copyright[] =
|
|
"@(#) Copyright (c) 1991, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)dd.c 8.5 (Berkeley) 4/2/94";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mtio.h>
|
|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "dd.h"
|
|
#include "extern.h"
|
|
|
|
static void dd_close __P((void));
|
|
static void dd_in __P((void));
|
|
static void getfdtype __P((IO *));
|
|
static void setup __P((void));
|
|
|
|
IO in, out; /* input/output state */
|
|
STAT st; /* statistics */
|
|
void (*cfunc) __P((void)); /* conversion function */
|
|
u_long cpy_cnt; /* # of blocks to copy */
|
|
u_int ddflags; /* conversion options */
|
|
u_int cbsz; /* conversion block size */
|
|
u_int files_cnt = 1; /* # of files to copy */
|
|
u_char *ctab; /* conversion table */
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
jcl(argv);
|
|
setup();
|
|
|
|
(void)signal(SIGINFO, summaryx);
|
|
(void)signal(SIGINT, terminate);
|
|
|
|
atexit(summary);
|
|
|
|
while (files_cnt--)
|
|
dd_in();
|
|
|
|
dd_close();
|
|
exit(0);
|
|
}
|
|
|
|
static void
|
|
setup()
|
|
{
|
|
u_int cnt;
|
|
|
|
if (in.name == NULL) {
|
|
in.name = "stdin";
|
|
in.fd = STDIN_FILENO;
|
|
} else {
|
|
in.fd = open(in.name, O_RDONLY, 0);
|
|
if (in.fd < 0)
|
|
err(1, "%s", in.name);
|
|
}
|
|
|
|
getfdtype(&in);
|
|
|
|
if (files_cnt > 1 && !(in.flags & ISTAPE))
|
|
errx(1, "files is not supported for non-tape devices");
|
|
|
|
if (out.name == NULL) {
|
|
/* No way to check for read access here. */
|
|
out.fd = STDOUT_FILENO;
|
|
out.name = "stdout";
|
|
} else {
|
|
#define OFLAGS \
|
|
(O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
|
|
out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE);
|
|
/*
|
|
* May not have read access, so try again with write only.
|
|
* Without read we may have a problem if output also does
|
|
* not support seeks.
|
|
*/
|
|
if (out.fd < 0) {
|
|
out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
|
|
out.flags |= NOREAD;
|
|
}
|
|
if (out.fd < 0)
|
|
err(1, "%s", out.name);
|
|
}
|
|
|
|
getfdtype(&out);
|
|
|
|
/*
|
|
* Allocate space for the input and output buffers. If not doing
|
|
* record oriented I/O, only need a single buffer.
|
|
*/
|
|
if (!(ddflags & (C_BLOCK|C_UNBLOCK))) {
|
|
if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL)
|
|
err(1, NULL);
|
|
out.db = in.db;
|
|
} else if ((in.db =
|
|
malloc((u_int)(MAX(in.dbsz, cbsz) + cbsz))) == NULL ||
|
|
(out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL)
|
|
err(1, NULL);
|
|
in.dbp = in.db;
|
|
out.dbp = out.db;
|
|
|
|
/* Position the input/output streams. */
|
|
if (in.offset)
|
|
pos_in();
|
|
if (out.offset)
|
|
pos_out();
|
|
|
|
/*
|
|
* Truncate the output file; ignore errors because it fails on some
|
|
* kinds of output files, tapes, for example.
|
|
*/
|
|
if (ddflags & (C_OF | C_SEEK | C_NOTRUNC) == (C_OF | C_SEEK))
|
|
(void)ftruncate(out.fd, (off_t)out.offset * out.dbsz);
|
|
|
|
/*
|
|
* If converting case at the same time as another conversion, build a
|
|
* table that does both at once. If just converting case, use the
|
|
* built-in tables.
|
|
*/
|
|
if (ddflags & (C_LCASE|C_UCASE))
|
|
if (ddflags & C_ASCII)
|
|
if (ddflags & C_LCASE) {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (isupper(ctab[cnt]))
|
|
ctab[cnt] = tolower(ctab[cnt]);
|
|
} else {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (islower(ctab[cnt]))
|
|
ctab[cnt] = toupper(ctab[cnt]);
|
|
}
|
|
else if (ddflags & C_EBCDIC)
|
|
if (ddflags & C_LCASE) {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (isupper(cnt))
|
|
ctab[cnt] = ctab[tolower(cnt)];
|
|
} else {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (islower(cnt))
|
|
ctab[cnt] = ctab[toupper(cnt)];
|
|
}
|
|
else {
|
|
ctab = ddflags & C_LCASE ? u2l : l2u;
|
|
if (ddflags & C_LCASE) {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (isupper(cnt))
|
|
ctab[cnt] = tolower(cnt);
|
|
} else {
|
|
for (cnt = 0; cnt < 0377; ++cnt)
|
|
if (islower(cnt))
|
|
ctab[cnt] = toupper(cnt);
|
|
}
|
|
}
|
|
(void)time(&st.start); /* Statistics timestamp. */
|
|
}
|
|
|
|
static void
|
|
getfdtype(io)
|
|
IO *io;
|
|
{
|
|
struct mtget mt;
|
|
struct stat sb;
|
|
|
|
if (fstat(io->fd, &sb))
|
|
err(1, "%s", io->name);
|
|
if (S_ISCHR(sb.st_mode))
|
|
io->flags |= ioctl(io->fd, MTIOCGET, &mt) ? ISCHR : ISTAPE;
|
|
else if (lseek(io->fd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE)
|
|
io->flags |= ISPIPE; /* XXX fixed in 4.4BSD */
|
|
}
|
|
|
|
static void
|
|
dd_in()
|
|
{
|
|
int flags, n;
|
|
|
|
for (flags = ddflags;;) {
|
|
if (cpy_cnt && (st.in_full + st.in_part) >= cpy_cnt)
|
|
return;
|
|
|
|
/*
|
|
* Zero the buffer first if trying to recover from errors so
|
|
* lose the minimum amount of data. If doing block operations
|
|
* use spaces.
|
|
*/
|
|
if ((flags & (C_NOERROR|C_SYNC)) == (C_NOERROR|C_SYNC))
|
|
if (flags & (C_BLOCK|C_UNBLOCK))
|
|
memset(in.dbp, ' ', in.dbsz);
|
|
else
|
|
memset(in.dbp, 0, in.dbsz);
|
|
|
|
n = read(in.fd, in.dbp, in.dbsz);
|
|
if (n == 0) {
|
|
in.dbrcnt = 0;
|
|
return;
|
|
}
|
|
|
|
/* Read error. */
|
|
if (n < 0) {
|
|
/*
|
|
* If noerror not specified, die. POSIX requires that
|
|
* the warning message be followed by an I/O display.
|
|
*/
|
|
if (!(flags & C_NOERROR))
|
|
err(1, "%s", in.name);
|
|
warn("%s", in.name);
|
|
summary();
|
|
|
|
/*
|
|
* If it's not a tape drive or a pipe, seek past the
|
|
* error. If your OS doesn't do the right thing for
|
|
* raw disks this section should be modified to re-read
|
|
* in sector size chunks.
|
|
*/
|
|
if (!(in.flags & (ISPIPE|ISTAPE)) &&
|
|
lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))
|
|
warn("%s", in.name);
|
|
|
|
/* If sync not specified, omit block and continue. */
|
|
if (!(ddflags & C_SYNC))
|
|
continue;
|
|
|
|
/* Read errors count as full blocks. */
|
|
in.dbcnt += in.dbrcnt = in.dbsz;
|
|
++st.in_full;
|
|
|
|
/* Handle full input blocks. */
|
|
} else if (n == in.dbsz) {
|
|
in.dbcnt += in.dbrcnt = n;
|
|
++st.in_full;
|
|
|
|
/* Handle partial input blocks. */
|
|
} else {
|
|
/* If sync, use the entire block. */
|
|
if (ddflags & C_SYNC)
|
|
in.dbcnt += in.dbrcnt = in.dbsz;
|
|
else
|
|
in.dbcnt += in.dbrcnt = n;
|
|
++st.in_part;
|
|
}
|
|
|
|
/*
|
|
* POSIX states that if bs is set and no other conversions
|
|
* than noerror, notrunc or sync are specified, the block
|
|
* is output without buffering as it is read.
|
|
*/
|
|
if (ddflags & C_BS) {
|
|
out.dbcnt = in.dbcnt;
|
|
dd_out(1);
|
|
in.dbcnt = 0;
|
|
continue;
|
|
}
|
|
|
|
if (ddflags & C_SWAB) {
|
|
if ((n = in.dbcnt) & 1) {
|
|
++st.swab;
|
|
--n;
|
|
}
|
|
swab(in.dbp, in.dbp, n);
|
|
}
|
|
|
|
in.dbp += in.dbrcnt;
|
|
(*cfunc)();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Cleanup any remaining I/O and flush output. If necesssary, output file
|
|
* is truncated.
|
|
*/
|
|
static void
|
|
dd_close()
|
|
{
|
|
if (cfunc == def)
|
|
def_close();
|
|
else if (cfunc == block)
|
|
block_close();
|
|
else if (cfunc == unblock)
|
|
unblock_close();
|
|
if (ddflags & C_OSYNC && out.dbcnt < out.dbsz) {
|
|
memset(out.dbp, 0, out.dbsz - out.dbcnt);
|
|
out.dbcnt = out.dbsz;
|
|
}
|
|
if (out.dbcnt)
|
|
dd_out(1);
|
|
}
|
|
|
|
void
|
|
dd_out(force)
|
|
int force;
|
|
{
|
|
static int warned;
|
|
int cnt, n, nw;
|
|
u_char *outp;
|
|
|
|
/*
|
|
* Write one or more blocks out. The common case is writing a full
|
|
* output block in a single write; increment the full block stats.
|
|
* Otherwise, we're into partial block writes. If a partial write,
|
|
* and it's a character device, just warn. If a tape device, quit.
|
|
*
|
|
* The partial writes represent two cases. 1: Where the input block
|
|
* was less than expected so the output block was less than expected.
|
|
* 2: Where the input block was the right size but we were forced to
|
|
* write the block in multiple chunks. The original versions of dd(1)
|
|
* never wrote a block in more than a single write, so the latter case
|
|
* never happened.
|
|
*
|
|
* One special case is if we're forced to do the write -- in that case
|
|
* we play games with the buffer size, and it's usually a partial write.
|
|
*/
|
|
outp = out.db;
|
|
for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
|
|
for (cnt = n;; cnt -= nw) {
|
|
nw = write(out.fd, outp, cnt);
|
|
if (nw <= 0) {
|
|
if (nw == 0)
|
|
errx(1, "%s: end of device", out.name);
|
|
if (errno != EINTR)
|
|
err(1, "%s", out.name);
|
|
nw = 0;
|
|
}
|
|
outp += nw;
|
|
st.bytes += nw;
|
|
if (nw == n) {
|
|
if (n != out.dbsz)
|
|
++st.out_part;
|
|
else
|
|
++st.out_full;
|
|
break;
|
|
}
|
|
++st.out_part;
|
|
if (nw == cnt)
|
|
break;
|
|
if (out.flags & ISCHR && !warned) {
|
|
warned = 1;
|
|
warnx("%s: short write on character device",
|
|
out.name);
|
|
}
|
|
if (out.flags & ISTAPE)
|
|
errx(1, "%s: short write on tape device", out.name);
|
|
}
|
|
if ((out.dbcnt -= n) < out.dbsz)
|
|
break;
|
|
}
|
|
|
|
/* Reassemble the output block. */
|
|
if (out.dbcnt)
|
|
memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
|
|
out.dbp = out.db + out.dbcnt;
|
|
}
|