initial population

1 files changed, 185 insertions, 0 deletions

diff --git a/bin/dd/position.c b/bin/dd/position.c
new file mode 100644
index 0000000..36dd580
--- /dev/null
+++ b/bin/dd/position.c
@@ -0,0 +1,185 @@
+/*	$NetBSD: position.c,v 1.18 2010/11/22 21:04:28 pooka Exp $	*/
+
+/*-
+ * 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. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)position.c	8.3 (Berkeley) 4/2/94";
+#else
+__RCSID("$NetBSD: position.c,v 1.18 2010/11/22 21:04:28 pooka Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mtio.h>
+#include <sys/time.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "dd.h"
+#include "extern.h"
+
+/*
+ * Position input/output data streams before starting the copy.  Device type
+ * dependent.  Seekable devices use lseek, and the rest position by reading.
+ * Seeking past the end of file can cause null blocks to be written to the
+ * output.
+ */
+void
+pos_in(void)
+{
+	int bcnt, cnt, nr, warned;
+
+	/* If not a pipe or tape device, try to seek on it. */
+	if (!(in.flags & (ISPIPE|ISTAPE))) {
+		if (ddop_lseek(in, in.fd,
+		    (off_t)in.offset * (off_t)in.dbsz, SEEK_CUR) == -1) {
+			err(EXIT_FAILURE, "%s", in.name);
+			/* NOTREACHED */
+		}
+		return;
+		/* NOTREACHED */
+	}
+
+	/*
+	 * Read the data.  If a pipe, read until satisfy the number of bytes
+	 * being skipped.  No differentiation for reading complete and partial
+	 * blocks for other devices.
+	 */
+	for (bcnt = in.dbsz, cnt = in.offset, warned = 0; cnt;) {
+		if ((nr = ddop_read(in, in.fd, in.db, bcnt)) > 0) {
+			if (in.flags & ISPIPE) {
+				if (!(bcnt -= nr)) {
+					bcnt = in.dbsz;
+					--cnt;
+				}
+			} else
+				--cnt;
+			continue;
+		}
+
+		if (nr == 0) {
+			if (files_cnt > 1) {
+				--files_cnt;
+				continue;
+			}
+			errx(EXIT_FAILURE, "skip reached end of input");
+			/* NOTREACHED */
+		}
+
+		/*
+		 * Input error -- either EOF with no more files, or I/O error.
+		 * If noerror not set die.  POSIX requires that the warning
+		 * message be followed by an I/O display.
+		 */
+		if (ddflags & C_NOERROR) {
+			if (!warned) {
+
+				warn("%s", in.name);
+				warned = 1;
+				summary();
+			}
+			continue;
+		}
+		err(EXIT_FAILURE, "%s", in.name);
+		/* NOTREACHED */
+	}
+}
+
+void
+pos_out(void)
+{
+	struct mtop t_op;
+	int n;
+	uint64_t cnt;
+
+	/*
+	 * If not a tape, try seeking on the file.  Seeking on a pipe is
+	 * going to fail, but don't protect the user -- they shouldn't
+	 * have specified the seek operand.
+	 */
+	if (!(out.flags & ISTAPE)) {
+		if (ddop_lseek(out, out.fd,
+		    (off_t)out.offset * (off_t)out.dbsz, SEEK_SET) == -1)
+			err(EXIT_FAILURE, "%s", out.name);
+			/* NOTREACHED */
+		return;
+	}
+
+	/* If no read access, try using mtio. */
+	if (out.flags & NOREAD) {
+		t_op.mt_op = MTFSR;
+		t_op.mt_count = out.offset;
+
+		if (ddop_ioctl(out, out.fd, MTIOCTOP, &t_op) < 0)
+			err(EXIT_FAILURE, "%s", out.name);
+			/* NOTREACHED */
+		return;
+	}
+
+	/* Read it. */
+	for (cnt = 0; cnt < out.offset; ++cnt) {
+		if ((n = ddop_read(out, out.fd, out.db, out.dbsz)) > 0)
+			continue;
+
+		if (n < 0)
+			err(EXIT_FAILURE, "%s", out.name);
+			/* NOTREACHED */
+
+		/*
+		 * If reach EOF, fill with NUL characters; first, back up over
+		 * the EOF mark.  Note, cnt has not yet been incremented, so
+		 * the EOF read does not count as a seek'd block.
+		 */
+		t_op.mt_op = MTBSR;
+		t_op.mt_count = 1;
+		if (ddop_ioctl(out, out.fd, MTIOCTOP, &t_op) == -1)
+			err(EXIT_FAILURE, "%s", out.name);
+			/* NOTREACHED */
+
+		while (cnt++ < out.offset)
+			if ((uint64_t)(n = bwrite(&out,
+			    out.db, out.dbsz)) != out.dbsz)
+				err(EXIT_FAILURE, "%s", out.name);
+				/* NOTREACHED */
+		break;
+	}
+}