BSD 4.4 Lite bin Sources

1 files changed, 395 insertions, 0 deletions

diff --git a/bin/dd/dd.c b/bin/dd/dd.c
new file mode 100644
index 0000000..05ac7a9
--- /dev/null
+++ b/bin/dd/dd.c
@@ -0,0 +1,395 @@
+/*-
+ * 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.
+ */
+
+#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;
+	(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;
+}