Remove not needed void casts.
[dragonfly.git] / bin / dd / dd.c
CommitLineData
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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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
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36 *
37 * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
38 * @(#)dd.c 8.5 (Berkeley) 4/2/94
39 * $FreeBSD: src/bin/dd/dd.c,v 1.27.2.3 2001/08/01 01:37:35 obrien Exp $
57fed2af 40 * $DragonFly: src/bin/dd/dd.c,v 1.5 2004/11/07 20:54:51 eirikn Exp $
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41 */
42
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43#include <sys/param.h>
44#include <sys/stat.h>
45#include <sys/conf.h>
46#include <sys/disklabel.h>
47#include <sys/filio.h>
48#include <sys/time.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <locale.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60#include "dd.h"
61#include "extern.h"
62
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DR
63static void dd_close (void);
64static void dd_in (void);
65int main (int, char *[]);
66static void getfdtype (IO *);
67static void setup (void);
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68
69IO in, out; /* input/output state */
70STAT st; /* statistics */
9dbf638f 71void (*cfunc) (void); /* conversion function */
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72quad_t cpy_cnt; /* # of blocks to copy */
73off_t pending = 0; /* pending seek if sparse */
74u_int ddflags; /* conversion options */
75size_t cbsz; /* conversion block size */
76quad_t files_cnt = 1; /* # of files to copy */
77const u_char *ctab; /* conversion table */
78
79int
b5744197 80main(int argc __unused, char **argv)
984263bc 81{
57fed2af 82 setlocale(LC_CTYPE, "");
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83 jcl(argv);
84 setup();
85
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EN
86 signal(SIGINFO, summaryx);
87 signal(SIGINT, terminate);
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88
89 atexit(summary);
90
91 while (files_cnt--)
92 dd_in();
93
94 dd_close();
95 exit(0);
96}
97
98static void
b5744197 99setup(void)
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100{
101 u_int cnt;
102 struct timeval tv;
103
104 if (in.name == NULL) {
105 in.name = "stdin";
106 in.fd = STDIN_FILENO;
107 } else {
108 in.fd = open(in.name, O_RDONLY, 0);
109 if (in.fd == -1)
110 err(1, "%s", in.name);
111 }
112
113 getfdtype(&in);
114
115 if (files_cnt > 1 && !(in.flags & ISTAPE))
116 errx(1, "files is not supported for non-tape devices");
117
118 if (out.name == NULL) {
119 /* No way to check for read access here. */
120 out.fd = STDOUT_FILENO;
121 out.name = "stdout";
122 } else {
123#define OFLAGS \
124 (O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
125 out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE);
126 /*
127 * May not have read access, so try again with write only.
128 * Without read we may have a problem if output also does
129 * not support seeks.
130 */
131 if (out.fd == -1) {
132 out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
133 out.flags |= NOREAD;
134 }
135 if (out.fd == -1)
136 err(1, "%s", out.name);
137 }
138
139 getfdtype(&out);
140
141 /*
142 * Allocate space for the input and output buffers. If not doing
143 * record oriented I/O, only need a single buffer.
144 */
145 if (!(ddflags & (C_BLOCK | C_UNBLOCK))) {
146 if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL)
147 err(1, "input buffer");
148 out.db = in.db;
149 } else if ((in.db = malloc(MAX(in.dbsz, cbsz) + cbsz)) == NULL ||
150 (out.db = malloc(out.dbsz + cbsz)) == NULL)
151 err(1, "output buffer");
152 in.dbp = in.db;
153 out.dbp = out.db;
154
155 /* Position the input/output streams. */
156 if (in.offset)
157 pos_in();
158 if (out.offset)
159 pos_out();
160
161 /*
162 * Truncate the output file. If it fails on a type of output file
163 * that it should _not_ fail on, error out.
164 */
165 if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK) &&
166 out.flags & ISTRUNC)
167 if (ftruncate(out.fd, out.offset * out.dbsz) == -1)
168 err(1, "truncating %s", out.name);
169
170 /*
171 * If converting case at the same time as another conversion, build a
172 * table that does both at once. If just converting case, use the
173 * built-in tables.
174 */
175 if (ddflags & (C_LCASE | C_UCASE)) {
176 if (ddflags & (C_ASCII | C_EBCDIC)) {
177 if (ddflags & C_LCASE) {
178 for (cnt = 0; cnt <= 0377; ++cnt)
179 casetab[cnt] = tolower(ctab[cnt]);
180 } else {
181 for (cnt = 0; cnt <= 0377; ++cnt)
182 casetab[cnt] = toupper(ctab[cnt]);
183 }
184 } else {
185 if (ddflags & C_LCASE) {
186 for (cnt = 0; cnt <= 0377; ++cnt)
187 casetab[cnt] = tolower((int)cnt);
188 } else {
189 for (cnt = 0; cnt <= 0377; ++cnt)
190 casetab[cnt] = toupper((int)cnt);
191 }
192 }
193 ctab = casetab;
194 }
195
57fed2af 196 gettimeofday(&tv, (struct timezone *)NULL);
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197 st.start = tv.tv_sec + tv.tv_usec * 1e-6;
198}
199
200static void
b5744197 201getfdtype(IO *io)
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202{
203 struct stat sb;
204 int type;
205
206 if (fstat(io->fd, &sb) == -1)
207 err(1, "%s", io->name);
208 if (S_ISREG(sb.st_mode))
209 io->flags |= ISTRUNC;
210 if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) {
211 if (ioctl(io->fd, FIODTYPE, &type) == -1) {
212 err(1, "%s", io->name);
213 } else {
214 if (type & D_TAPE)
215 io->flags |= ISTAPE;
216 else if (type & (D_DISK | D_MEM)) {
217 if (type & D_DISK) {
218 const int one = 1;
219
57fed2af 220 ioctl(io->fd, DIOCWLABEL, &one);
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221 }
222 io->flags |= ISSEEK;
223 }
224 if (S_ISCHR(sb.st_mode) && (type & D_TAPE) == 0)
225 io->flags |= ISCHR;
226 }
227 return;
228 }
229 errno = 0;
230 if (lseek(io->fd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE)
231 io->flags |= ISPIPE;
232 else
233 io->flags |= ISSEEK;
234}
235
236static void
b5744197 237dd_in(void)
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238{
239 ssize_t n;
240
241 for (;;) {
242 switch (cpy_cnt) {
243 case -1: /* count=0 was specified */
244 return;
245 case 0:
246 break;
247 default:
248 if (st.in_full + st.in_part >= (u_quad_t)cpy_cnt)
249 return;
250 break;
251 }
252
253 /*
254 * Zero the buffer first if sync; if doing block operations,
255 * use spaces.
256 */
257 if (ddflags & C_SYNC) {
258 if (ddflags & (C_BLOCK | C_UNBLOCK))
259 memset(in.dbp, ' ', in.dbsz);
260 else
261 memset(in.dbp, 0, in.dbsz);
262 }
263
264 n = read(in.fd, in.dbp, in.dbsz);
265 if (n == 0) {
266 in.dbrcnt = 0;
267 return;
268 }
269
270 /* Read error. */
271 if (n == -1) {
272 /*
273 * If noerror not specified, die. POSIX requires that
274 * the warning message be followed by an I/O display.
275 */
276 if (!(ddflags & C_NOERROR))
277 err(1, "%s", in.name);
278 warn("%s", in.name);
279 summary();
280
281 /*
282 * If it's a seekable file descriptor, seek past the
283 * error. If your OS doesn't do the right thing for
284 * raw disks this section should be modified to re-read
285 * in sector size chunks.
286 */
287 if (in.flags & ISSEEK &&
288 lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))
289 warn("%s", in.name);
290
291 /* If sync not specified, omit block and continue. */
292 if (!(ddflags & C_SYNC))
293 continue;
294
295 /* Read errors count as full blocks. */
296 in.dbcnt += in.dbrcnt = in.dbsz;
297 ++st.in_full;
298
299 /* Handle full input blocks. */
300 } else if ((size_t)n == in.dbsz) {
301 in.dbcnt += in.dbrcnt = n;
302 ++st.in_full;
303
304 /* Handle partial input blocks. */
305 } else {
306 /* If sync, use the entire block. */
307 if (ddflags & C_SYNC)
308 in.dbcnt += in.dbrcnt = in.dbsz;
309 else
310 in.dbcnt += in.dbrcnt = n;
311 ++st.in_part;
312 }
313
314 /*
315 * POSIX states that if bs is set and no other conversions
316 * than noerror, notrunc or sync are specified, the block
317 * is output without buffering as it is read.
318 */
319 if (ddflags & C_BS) {
320 out.dbcnt = in.dbcnt;
321 dd_out(1);
322 in.dbcnt = 0;
323 continue;
324 }
325
326 if (ddflags & C_SWAB) {
327 if ((n = in.dbrcnt) & 1) {
328 ++st.swab;
329 --n;
330 }
331 swab(in.dbp, in.dbp, (size_t)n);
332 }
333
334 in.dbp += in.dbrcnt;
335 (*cfunc)();
336 }
337}
338
339/*
340 * Clean up any remaining I/O and flush output. If necessary, the output file
341 * is truncated.
342 */
343static void
b5744197 344dd_close(void)
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345{
346 if (cfunc == def)
347 def_close();
348 else if (cfunc == block)
349 block_close();
350 else if (cfunc == unblock)
351 unblock_close();
352 if (ddflags & C_OSYNC && out.dbcnt && out.dbcnt < out.dbsz) {
353 if (ddflags & (C_BLOCK | C_UNBLOCK))
354 memset(out.dbp, ' ', out.dbsz - out.dbcnt);
355 else
356 memset(out.dbp, 0, out.dbsz - out.dbcnt);
357 out.dbcnt = out.dbsz;
358 }
359 if (out.dbcnt || pending)
360 dd_out(1);
361}
362
363void
b5744197 364dd_out(int force)
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365{
366 u_char *outp;
367 size_t cnt, i, n;
368 ssize_t nw;
369 static int warned;
370 int sparse;
371
372 /*
373 * Write one or more blocks out. The common case is writing a full
374 * output block in a single write; increment the full block stats.
375 * Otherwise, we're into partial block writes. If a partial write,
376 * and it's a character device, just warn. If a tape device, quit.
377 *
378 * The partial writes represent two cases. 1: Where the input block
379 * was less than expected so the output block was less than expected.
380 * 2: Where the input block was the right size but we were forced to
381 * write the block in multiple chunks. The original versions of dd(1)
382 * never wrote a block in more than a single write, so the latter case
383 * never happened.
384 *
385 * One special case is if we're forced to do the write -- in that case
386 * we play games with the buffer size, and it's usually a partial write.
387 */
388 outp = out.db;
389 for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
390 for (cnt = n;; cnt -= nw) {
391 sparse = 0;
392 if (ddflags & C_SPARSE) {
393 sparse = 1; /* Is buffer sparse? */
394 for (i = 0; i < cnt; i++)
395 if (outp[i] != 0) {
396 sparse = 0;
397 break;
398 }
399 }
400 if (sparse && !force) {
401 pending += cnt;
402 nw = cnt;
403 } else {
404 if (pending != 0) {
405 if (force)
406 pending--;
407 if (lseek(out.fd, pending, SEEK_CUR) ==
408 -1)
409 err(2, "%s: seek error creating sparse file",
410 out.name);
411 if (force)
412 write(out.fd, outp, 1);
413 pending = 0;
414 }
415 if (cnt)
416 nw = write(out.fd, outp, cnt);
417 else
418 return;
419 }
420
421 if (nw <= 0) {
422 if (nw == 0)
423 errx(1, "%s: end of device", out.name);
424 if (errno != EINTR)
425 err(1, "%s", out.name);
426 nw = 0;
427 }
428 outp += nw;
429 st.bytes += nw;
430 if ((size_t)nw == n) {
431 if (n != out.dbsz)
432 ++st.out_part;
433 else
434 ++st.out_full;
435 break;
436 }
437 ++st.out_part;
438 if ((size_t)nw == cnt)
439 break;
440 if (out.flags & ISTAPE)
441 errx(1, "%s: short write on tape device",
442 out.name);
443 if (out.flags & ISCHR && !warned) {
444 warned = 1;
445 warnx("%s: short write on character device",
446 out.name);
447 }
448 }
449 if ((out.dbcnt -= n) < out.dbsz)
450 break;
451 }
452
453 /* Reassemble the output block. */
454 if (out.dbcnt)
57fed2af 455 memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
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456 out.dbp = out.db + out.dbcnt;
457}