#include <sys/cdefs.h>
#ifndef lint
__used static char const copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#ifndef lint
#if 0
static char sccsid[] = "@(#)dd.c 8.5 (Berkeley) 4/2/94";
#endif
__used static const char rcsid[] =
"$FreeBSD: src/bin/dd/dd.c,v 1.36 2002/03/07 14:00:33 markm Exp $";
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/filio.h>
#include <sys/time.h>
#ifdef __APPLE__
#include <sys/ioctl.h>
#else
#include <sys/disklabel.h>
#endif
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dd.h"
#include "extern.h"
static void dd_close(void);
static void dd_in(void);
static void getfdtype(IO *);
static void setup(void);
IO in, out;
STAT st;
void (*cfunc)(void);
quad_t cpy_cnt;
off_t pending = 0;
u_int ddflags;
size_t cbsz;
quad_t files_cnt = 1;
const u_char *ctab;
int
main(int argc, char *argv[])
{
(void)setlocale(LC_CTYPE, "");
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(void)
{
u_int cnt;
struct timeval tv;
if (in.name == NULL) {
in.name = "stdin";
in.fd = STDIN_FILENO;
} else {
in.fd = open(in.name, O_RDONLY, 0);
if (in.fd == -1)
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) {
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);
if (out.fd == -1) {
out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
out.flags |= NOREAD;
}
if (out.fd == -1)
err(1, "%s", out.name);
}
getfdtype(&out);
if (!(ddflags & (C_BLOCK | C_UNBLOCK))) {
if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL)
err(1, "input buffer");
out.db = in.db;
} else if ((in.db = malloc(MAX(in.dbsz, cbsz) + cbsz)) == NULL ||
(out.db = malloc(out.dbsz + cbsz)) == NULL)
err(1, "output buffer");
in.dbp = in.db;
out.dbp = out.db;
if (in.offset)
pos_in();
if (out.offset)
pos_out();
if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK) &&
out.flags & ISTRUNC)
if (ftruncate(out.fd, out.offset * out.dbsz) == -1)
err(1, "truncating %s", out.name);
if (ddflags & (C_LCASE | C_UCASE)) {
if (ddflags & (C_ASCII | C_EBCDIC)) {
if (ddflags & C_LCASE) {
for (cnt = 0; cnt <= 0377; ++cnt)
casetab[cnt] = tolower(ctab[cnt]);
} else {
for (cnt = 0; cnt <= 0377; ++cnt)
casetab[cnt] = toupper(ctab[cnt]);
}
} else {
if (ddflags & C_LCASE) {
for (cnt = 0; cnt <= 0377; ++cnt)
casetab[cnt] = tolower((int)cnt);
} else {
for (cnt = 0; cnt <= 0377; ++cnt)
casetab[cnt] = toupper((int)cnt);
}
}
ctab = casetab;
}
(void)gettimeofday(&tv, (struct timezone *)NULL);
st.start = tv.tv_sec + tv.tv_usec * 1e-6;
}
static void
getfdtype(IO *io)
{
struct stat sb;
int type;
if (fstat(io->fd, &sb) == -1)
err(1, "%s", io->name);
if (S_ISREG(sb.st_mode))
io->flags |= ISTRUNC;
if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) {
if (ioctl(io->fd, FIODTYPE, &type) == -1) {
err(1, "%s", io->name);
} else {
#ifdef __APPLE__
if (type == D_TAPE)
io->flags |= ISTAPE;
else if (type == D_DISK || type == D_TTY) {
#else
if (type & D_TAPE)
io->flags |= ISTAPE;
else if (type & (D_DISK | D_MEM)) {
if (type & D_DISK) {
const int one = 1;
(void)ioctl(io->fd, DIOCWLABEL, &one);
}
#endif
io->flags |= ISSEEK;
}
#ifdef __APPLE__
if (S_ISCHR(sb.st_mode) && (type != D_TAPE))
#else
if (S_ISCHR(sb.st_mode) && (type & D_TAPE) == 0)
#endif
io->flags |= ISCHR;
}
return;
}
errno = 0;
if (lseek(io->fd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE)
io->flags |= ISPIPE;
else
io->flags |= ISSEEK;
}
static void
dd_in(void)
{
ssize_t n;
for (;;) {
switch (cpy_cnt) {
case -1:
return;
case 0:
break;
default:
if (st.in_full + st.in_part >= (u_quad_t)cpy_cnt)
return;
break;
}
if (ddflags & C_SYNC) {
if (ddflags & (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;
}
if (n == -1) {
if (!(ddflags & C_NOERROR))
err(1, "%s", in.name);
warn("%s", in.name);
summary();
if (in.flags & ISSEEK &&
lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))
warn("%s", in.name);
if (!(ddflags & C_SYNC))
continue;
in.dbcnt += in.dbrcnt = in.dbsz;
++st.in_full;
} else if ((size_t)n == in.dbsz) {
in.dbcnt += in.dbrcnt = n;
++st.in_full;
} else {
if (ddflags & C_SYNC)
in.dbcnt += in.dbrcnt = in.dbsz;
else
in.dbcnt += in.dbrcnt = n;
++st.in_part;
}
if (ddflags & C_BS) {
out.dbcnt = in.dbcnt;
dd_out(1);
in.dbcnt = 0;
continue;
}
if (ddflags & C_SWAB) {
if ((n = in.dbrcnt) & 1) {
++st.swab;
--n;
}
swab(in.dbp, in.dbp, (size_t)n);
}
in.dbp += in.dbrcnt;
(*cfunc)();
}
}
static void
dd_close(void)
{
if (cfunc == def)
def_close();
else if (cfunc == block)
block_close();
else if (cfunc == unblock)
unblock_close();
if (ddflags & C_OSYNC && out.dbcnt && out.dbcnt < out.dbsz) {
if (ddflags & (C_BLOCK | C_UNBLOCK))
memset(out.dbp, ' ', out.dbsz - out.dbcnt);
else
memset(out.dbp, 0, out.dbsz - out.dbcnt);
out.dbcnt = out.dbsz;
}
if (out.dbcnt || pending)
dd_out(1);
}
void
dd_out(int force)
{
u_char *outp;
size_t cnt, i, n;
ssize_t nw;
static int warned;
int sparse;
outp = out.db;
for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
for (cnt = n;; cnt -= nw) {
sparse = 0;
if (ddflags & C_SPARSE) {
sparse = 1;
for (i = 0; i < cnt; i++)
if (outp[i] != 0) {
sparse = 0;
break;
}
}
if (sparse && !force) {
pending += cnt;
nw = cnt;
} else {
if (pending != 0) {
if (force)
pending--;
if (lseek(out.fd, pending, SEEK_CUR) ==
-1)
err(2, "%s: seek error creating sparse file",
out.name);
if (force)
write(out.fd, outp, 1);
pending = 0;
}
if (cnt)
nw = write(out.fd, outp, cnt);
else
return;
}
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 ((size_t)nw == n) {
if (n != out.dbsz)
++st.out_part;
else
++st.out_full;
break;
}
++st.out_part;
if ((size_t)nw == cnt)
break;
if (out.flags & ISTAPE)
errx(1, "%s: short write on tape device",
out.name);
if (out.flags & ISCHR && !warned) {
warned = 1;
warnx("%s: short write on character device",
out.name);
}
}
if ((out.dbcnt -= n) < out.dbsz)
break;
}
if (out.dbcnt)
(void)memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
out.dbp = out.db + out.dbcnt;
}