source: rtems/cpukit/libmisc/shell/dd-position.c @ 9a77af8

4.104.115
Last change on this file since 9a77af8 was 9a77af8, checked in by Ralf Corsepius <ralf.corsepius@…>, on Mar 26, 2010 at 5:18:43 PM

Add HAVE_CONFIG_H support to let files receive configure defines.

  • Property mode set to 100644
File size: 5.3 KB
Line 
1/*-
2 * Copyright (c) 1991, 1993, 1994
3 *      The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Keith Muller of the University of California, San Diego and Lance
7 * Visser of Convex Computer Corporation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include "config.h"
36#endif
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)position.c  8.3 (Berkeley) 4/2/94";
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: src/bin/dd/position.c,v 1.23 2004/04/06 20:06:46 markm Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/types.h>
47#if RTEMS_REMOVED
48#include <sys/mtio.h>
49#endif
50
51#include <err.h>
52#include <errno.h>
53#include <inttypes.h>
54#include <unistd.h>
55
56#include "dd.h"
57#include "extern-dd.h"
58
59/*
60 * Position input/output data streams before starting the copy.  Device type
61 * dependent.  Seekable devices use lseek, and the rest position by reading.
62 * Seeking past the end of file can cause null blocks to be written to the
63 * output.
64 */
65void
66pos_in(rtems_shell_dd_globals* globals)
67{
68        off_t cnt;
69        int warned;
70        ssize_t nr;
71        size_t bcnt;
72
73        /* If known to be seekable, try to seek on it. */
74        if (in.flags & ISSEEK) {
75                errno = 0;
76                if (lseek(in.fd, in.offset * in.dbsz, SEEK_CUR) == -1 &&
77                    errno != 0)
78                        err(exit_jump, 1, "%s", in.name);
79                return;
80        }
81
82        /* Don't try to read a really weird amount (like negative). */
83        if (in.offset < 0)
84                errx(exit_jump, 1, "%s: illegal offset", "iseek/skip");
85
86        /*
87         * Read the data.  If a pipe, read until satisfy the number of bytes
88         * being skipped.  No differentiation for reading complete and partial
89         * blocks for other devices.
90         */
91        for (bcnt = in.dbsz, cnt = in.offset, warned = 0; cnt;) {
92                if ((nr = read(in.fd, in.db, bcnt)) > 0) {
93                        if (in.flags & ISPIPE) {
94                                if (!(bcnt -= nr)) {
95                                        bcnt = in.dbsz;
96                                        --cnt;
97                                }
98                        } else
99                                --cnt;
100                        continue;
101                }
102
103                if (nr == 0) {
104                        if (files_cnt > 1) {
105                                --files_cnt;
106                                continue;
107                        }
108                        errx(exit_jump, 1, "skip reached end of input");
109                }
110
111                /*
112                 * Input error -- either EOF with no more files, or I/O error.
113                 * If noerror not set die.  POSIX requires that the warning
114                 * message be followed by an I/O display.
115                 */
116                if (ddflags & C_NOERROR) {
117                        if (!warned) {
118                                warn("%s", in.name);
119                                warned = 1;
120                                summary(globals);
121                        }
122                        continue;
123                }
124                err(exit_jump, 1, "%s", in.name);
125        }
126}
127
128void
129pos_out(rtems_shell_dd_globals* globals)
130{
131#if RTEMS_REMOVED
132        struct mtop t_op;
133        off_t cnt;
134        ssize_t n;
135#endif
136
137        /*
138         * If not a tape, try seeking on the file.  Seeking on a pipe is
139         * going to fail, but don't protect the user -- they shouldn't
140         * have specified the seek operand.
141         */
142        if (out.flags & (ISSEEK | ISPIPE)) {
143                errno = 0;
144                if (lseek(out.fd, out.offset * out.dbsz, SEEK_CUR) == -1 &&
145                    errno != 0)
146                        err(exit_jump, 1, "%s", out.name);
147                return;
148        }
149
150        /* Don't try to read a really weird amount (like negative). */
151        if (out.offset < 0)
152                errx(exit_jump, 1, "%s: illegal offset", "oseek/seek");
153
154#if RTEMS_REMOVED
155        /* If no read access, try using mtio. */
156        if (out.flags & NOREAD) {
157                t_op.mt_op = MTFSR;
158                t_op.mt_count = out.offset;
159
160                if (ioctl(out.fd, MTIOCTOP, &t_op) == -1)
161                        err(1, "%s", out.name);
162                return;
163        }
164
165        /* Read it. */
166        for (cnt = 0; cnt < out.offset; ++cnt) {
167                if ((n = read(out.fd, out.db, out.dbsz)) > 0)
168                        continue;
169
170                if (n == -1)
171                        err(1, "%s", out.name);
172
173                /*
174                 * If reach EOF, fill with NUL characters; first, back up over
175                 * the EOF mark.  Note, cnt has not yet been incremented, so
176                 * the EOF read does not count as a seek'd block.
177                 */
178                t_op.mt_op = MTBSR;
179                t_op.mt_count = 1;
180                if (ioctl(out.fd, MTIOCTOP, &t_op) == -1)
181                        err(1, "%s", out.name);
182
183                while (cnt++ < out.offset) {
184                        n = write(out.fd, out.db, out.dbsz);
185                        if (n == -1)
186                                err(1, "%s", out.name);
187                        if ((size_t)n != out.dbsz)
188                                errx(1, "%s: write failure", out.name);
189                }
190                break;
191        }
192#endif
193}
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