17bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes/* $NetBSD: position.c,v 1.18 2010/11/22 21:04:28 pooka Exp $ */ 27bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 37bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes/*- 47bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Copyright (c) 1991, 1993, 1994 57bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * The Regents of the University of California. All rights reserved. 67bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 77bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * This code is derived from software contributed to Berkeley by 87bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Keith Muller of the University of California, San Diego and Lance 97bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Visser of Convex Computer Corporation. 107bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 117bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Redistribution and use in source and binary forms, with or without 127bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * modification, are permitted provided that the following conditions 137bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * are met: 147bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 1. Redistributions of source code must retain the above copyright 157bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * notice, this list of conditions and the following disclaimer. 167bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 2. Redistributions in binary form must reproduce the above copyright 177bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * notice, this list of conditions and the following disclaimer in the 187bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * documentation and/or other materials provided with the distribution. 197bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 3. Neither the name of the University nor the names of its contributors 207bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * may be used to endorse or promote products derived from this software 217bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * without specific prior written permission. 227bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * 237bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 247bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 257bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 267bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 277bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 287bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 297bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 307bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 317bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 327bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 337bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * SUCH DAMAGE. 347bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 357bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 367bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/cdefs.h> 377bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#ifndef lint 387bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#if 0 397bb5660647d0106f96b000c25f5690a45734c38cElliott Hughesstatic char sccsid[] = "@(#)position.c 8.3 (Berkeley) 4/2/94"; 407bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#else 417bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes__RCSID("$NetBSD: position.c,v 1.18 2010/11/22 21:04:28 pooka Exp $"); 427bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#endif 437bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#endif /* not lint */ 447bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 457bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/types.h> 467bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/stat.h> 477bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/ioctl.h> 487bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/mtio.h> 497bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <sys/time.h> 507bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 517bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <err.h> 527bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <errno.h> 537bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <stdlib.h> 547bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <string.h> 557bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include <unistd.h> 567bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 577bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include "dd.h" 587bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes#include "extern.h" 597bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 607bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes/* 617bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Position input/output data streams before starting the copy. Device type 627bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * dependent. Seekable devices use lseek, and the rest position by reading. 637bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Seeking past the end of file can cause null blocks to be written to the 647bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * output. 657bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 667bb5660647d0106f96b000c25f5690a45734c38cElliott Hughesvoid 677bb5660647d0106f96b000c25f5690a45734c38cElliott Hughespos_in(void) 687bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes{ 697bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes int bcnt, cnt, nr, warned; 707bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 717bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* If not a pipe or tape device, try to seek on it. */ 727bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (!(in.flags & (ISPIPE|ISTAPE))) { 737bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (ddop_lseek(in, in.fd, 747bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes (off_t)in.offset * (off_t)in.dbsz, SEEK_CUR) == -1) { 757bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", in.name); 767bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 777bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 787bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes return; 797bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 807bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 817bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 827bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* 837bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Read the data. If a pipe, read until satisfy the number of bytes 847bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * being skipped. No differentiation for reading complete and partial 857bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * blocks for other devices. 867bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 877bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes for (bcnt = in.dbsz, cnt = in.offset, warned = 0; cnt;) { 887bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if ((nr = ddop_read(in, in.fd, in.db, bcnt)) > 0) { 897bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (in.flags & ISPIPE) { 907bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (!(bcnt -= nr)) { 917bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes bcnt = in.dbsz; 927bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes --cnt; 937bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 947bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } else 957bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes --cnt; 967bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes continue; 977bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 987bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 997bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (nr == 0) { 1007bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (files_cnt > 1) { 1017bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes --files_cnt; 1027bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes continue; 1037bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1047bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes errx(EXIT_FAILURE, "skip reached end of input"); 1057bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1067bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1077bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1087bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* 1097bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * Input error -- either EOF with no more files, or I/O error. 1107bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * If noerror not set die. POSIX requires that the warning 1117bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * message be followed by an I/O display. 1127bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 1137bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (ddflags & C_NOERROR) { 1147bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (!warned) { 1157bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1167bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes warn("%s", in.name); 1177bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes warned = 1; 1187bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes summary(); 1197bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1207bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes continue; 1217bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1227bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", in.name); 1237bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1247bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1257bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes} 1267bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1277bb5660647d0106f96b000c25f5690a45734c38cElliott Hughesvoid 1287bb5660647d0106f96b000c25f5690a45734c38cElliott Hughespos_out(void) 1297bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes{ 1307bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes struct mtop t_op; 1317bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes int n; 1327bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes uint64_t cnt; 1337bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1347bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* 1357bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * If not a tape, try seeking on the file. Seeking on a pipe is 1367bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * going to fail, but don't protect the user -- they shouldn't 1377bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * have specified the seek operand. 1387bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 1397bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (!(out.flags & ISTAPE)) { 1407bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (ddop_lseek(out, out.fd, 1417bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes (off_t)out.offset * (off_t)out.dbsz, SEEK_SET) == -1) 1427bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", out.name); 1437bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1447bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes return; 1457bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1467bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1477bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* If no read access, try using mtio. */ 1487bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (out.flags & NOREAD) { 1497bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes t_op.mt_op = MTFSR; 1507bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes t_op.mt_count = out.offset; 1517bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1527bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (ddop_ioctl(out, out.fd, MTIOCTOP, &t_op) < 0) 1537bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", out.name); 1547bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1557bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes return; 1567bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1577bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1587bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* Read it. */ 1597bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes for (cnt = 0; cnt < out.offset; ++cnt) { 1607bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if ((n = ddop_read(out, out.fd, out.db, out.dbsz)) > 0) 1617bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes continue; 1627bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1637bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (n < 0) 1647bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", out.name); 1657bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1667bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1677bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* 1687bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * If reach EOF, fill with NUL characters; first, back up over 1697bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * the EOF mark. Note, cnt has not yet been incremented, so 1707bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes * the EOF read does not count as a seek'd block. 1717bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes */ 1727bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes t_op.mt_op = MTBSR; 1737bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes t_op.mt_count = 1; 1747bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if (ddop_ioctl(out, out.fd, MTIOCTOP, &t_op) == -1) 1757bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", out.name); 1767bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1777bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes 1787bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes while (cnt++ < out.offset) 1797bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes if ((uint64_t)(n = bwrite(&out, 1807bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes out.db, out.dbsz)) != out.dbsz) 1817bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes err(EXIT_FAILURE, "%s", out.name); 1827bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes /* NOTREACHED */ 1837bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes break; 1847bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes } 1857bb5660647d0106f96b000c25f5690a45734c38cElliott Hughes} 186