5ff6541e7a
what I was trying to do work much better (ie at all. I could have sworn it was working...) Fix a SEEK_SET to be SEEK_CUR, and make Bruce's lseek() test work correctly.
460 lines
11 KiB
C
460 lines
11 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego and Lance
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* Visser of Convex Computer Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)dd.c 8.5 (Berkeley) 4/2/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/conf.h>
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#include <sys/filio.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dd.h"
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#include "extern.h"
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static void dd_close __P((void));
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static void dd_in __P((void));
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static void getfdtype __P((IO *));
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static void setup __P((void));
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IO in, out; /* input/output state */
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STAT st; /* statistics */
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void (*cfunc) __P((void)); /* conversion function */
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quad_t cpy_cnt; /* # of blocks to copy */
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off_t pending = 0; /* pending seek if sparse */
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u_int ddflags; /* conversion options */
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size_t cbsz; /* conversion block size */
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quad_t files_cnt = 1; /* # of files to copy */
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const u_char *ctab; /* conversion table */
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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(void)setlocale(LC_CTYPE, "");
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jcl(argv);
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setup();
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(void)signal(SIGINFO, summaryx);
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(void)signal(SIGINT, terminate);
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atexit(summary);
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while (files_cnt--)
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dd_in();
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dd_close();
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exit(0);
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}
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static void
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setup()
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{
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u_int cnt;
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struct timeval tv;
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if (in.name == NULL) {
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in.name = "stdin";
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in.fd = STDIN_FILENO;
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} else {
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in.fd = open(in.name, O_RDONLY, 0);
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if (in.fd == -1)
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err(1, "%s", in.name);
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}
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getfdtype(&in);
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if (files_cnt > 1 && !(in.flags & ISTAPE))
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errx(1, "files is not supported for non-tape devices");
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if (out.name == NULL) {
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/* No way to check for read access here. */
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out.fd = STDOUT_FILENO;
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out.name = "stdout";
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} else {
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#define OFLAGS \
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(O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
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out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE);
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/*
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* May not have read access, so try again with write only.
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* Without read we may have a problem if output also does
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* not support seeks.
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*/
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if (out.fd == -1) {
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out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
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out.flags |= NOREAD;
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}
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if (out.fd == -1)
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err(1, "%s", out.name);
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}
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getfdtype(&out);
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/*
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* Allocate space for the input and output buffers. If not doing
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* record oriented I/O, only need a single buffer.
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*/
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if (!(ddflags & (C_BLOCK | C_UNBLOCK))) {
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if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL)
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err(1, "input buffer");
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out.db = in.db;
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} else if ((in.db = malloc(MAX(in.dbsz, cbsz) + cbsz)) == NULL ||
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(out.db = malloc(out.dbsz + cbsz)) == NULL)
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err(1, "output buffer");
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in.dbp = in.db;
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out.dbp = out.db;
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/* Position the input/output streams. */
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if (in.offset)
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pos_in();
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if (out.offset)
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pos_out();
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/*
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* Truncate the output file; ignore errors because it fails on some
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* kinds of output files, tapes, for example.
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*/
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if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK))
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(void)ftruncate(out.fd, out.offset * out.dbsz);
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/*
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* If converting case at the same time as another conversion, build a
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* table that does both at once. If just converting case, use the
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* built-in tables.
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*/
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if (ddflags & (C_LCASE | C_UCASE)) {
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if (ddflags & (C_ASCII | C_EBCDIC)) {
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if (ddflags & C_LCASE) {
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for (cnt = 0; cnt <= 0377; ++cnt)
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casetab[cnt] = tolower(ctab[cnt]);
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} else {
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for (cnt = 0; cnt <= 0377; ++cnt)
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casetab[cnt] = toupper(ctab[cnt]);
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}
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} else {
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if (ddflags & C_LCASE) {
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for (cnt = 0; cnt <= 0377; ++cnt)
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casetab[cnt] = tolower(cnt);
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} else {
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for (cnt = 0; cnt <= 0377; ++cnt)
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casetab[cnt] = toupper(cnt);
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}
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}
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ctab = casetab;
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}
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(void)gettimeofday(&tv, (struct timezone *)NULL);
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st.start = tv.tv_sec + tv.tv_usec * 1e-6;
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}
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static void
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getfdtype(io)
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IO *io;
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{
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struct stat sb;
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int type;
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if (fstat(io->fd, &sb) == -1)
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err(1, "%s", io->name);
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if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) {
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if (ioctl(io->fd, FIODTYPE, &type) == -1) {
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warn("%s", io->name);
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if (S_ISCHR(sb.st_mode))
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io->flags |= ISCHR;
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} else {
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if (type & D_TAPE)
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io->flags |= ISTAPE;
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else if (type & (D_DISK | D_MEM))
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io->flags |= ISSEEK;
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if (S_ISCHR(sb.st_mode) && (type & D_TAPE) == 0)
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io->flags |= ISCHR;
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}
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return;
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}
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errno = 0;
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if (lseek(io->fd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE)
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io->flags |= ISPIPE;
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else
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io->flags |= ISSEEK;
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}
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static void
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dd_in()
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{
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ssize_t n;
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for (;;) {
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switch (cpy_cnt) {
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case -1: /* count=0 was specified */
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return;
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case 0:
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break;
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default:
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if (st.in_full + st.in_part >= cpy_cnt)
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return;
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break;
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}
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/*
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* Zero the buffer first if sync; if doing block operations,
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* use spaces.
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*/
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if (ddflags & C_SYNC) {
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if (ddflags & (C_BLOCK | C_UNBLOCK))
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memset(in.dbp, ' ', in.dbsz);
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else
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memset(in.dbp, 0, in.dbsz);
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}
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n = read(in.fd, in.dbp, in.dbsz);
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if (n == 0) {
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in.dbrcnt = 0;
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return;
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}
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/* Read error. */
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if (n == -1) {
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/*
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* If noerror not specified, die. POSIX requires that
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* the warning message be followed by an I/O display.
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*/
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if (!(ddflags & C_NOERROR))
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err(1, "%s", in.name);
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warn("%s", in.name);
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summary();
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/*
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* If it's a seekable file descriptor, seek past the
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* error. If your OS doesn't do the right thing for
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* raw disks this section should be modified to re-read
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* in sector size chunks.
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*/
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if (in.flags & ISSEEK &&
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lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))
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warn("%s", in.name);
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/* If sync not specified, omit block and continue. */
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if (!(ddflags & C_SYNC))
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continue;
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/* Read errors count as full blocks. */
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in.dbcnt += in.dbrcnt = in.dbsz;
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++st.in_full;
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/* Handle full input blocks. */
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} else if (n == in.dbsz) {
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in.dbcnt += in.dbrcnt = n;
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++st.in_full;
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/* Handle partial input blocks. */
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} else {
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/* If sync, use the entire block. */
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if (ddflags & C_SYNC)
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in.dbcnt += in.dbrcnt = in.dbsz;
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else
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in.dbcnt += in.dbrcnt = n;
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++st.in_part;
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}
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/*
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* POSIX states that if bs is set and no other conversions
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* than noerror, notrunc or sync are specified, the block
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* is output without buffering as it is read.
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*/
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if (ddflags & C_BS) {
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out.dbcnt = in.dbcnt;
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dd_out(1);
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in.dbcnt = 0;
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continue;
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}
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if (ddflags & C_SWAB) {
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if ((n = in.dbrcnt) & 1) {
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++st.swab;
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--n;
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}
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swab(in.dbp, in.dbp, n);
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}
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in.dbp += in.dbrcnt;
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(*cfunc)();
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}
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}
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/*
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* Clean up any remaining I/O and flush output. If necessary, the output file
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* is truncated.
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*/
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static void
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dd_close()
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{
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if (cfunc == def)
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def_close();
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else if (cfunc == block)
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block_close();
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else if (cfunc == unblock)
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unblock_close();
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if (ddflags & C_OSYNC && out.dbcnt && out.dbcnt < out.dbsz) {
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if (ddflags & (C_BLOCK | C_UNBLOCK))
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memset(out.dbp, ' ', out.dbsz - out.dbcnt);
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else
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memset(out.dbp, 0, out.dbsz - out.dbcnt);
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out.dbcnt = out.dbsz;
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}
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if (out.dbcnt || pending)
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dd_out(1);
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}
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void
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dd_out(force)
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int force;
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{
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u_char *outp;
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size_t cnt, i, n;
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ssize_t nw;
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static int warned;
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int sparse;
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/*
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* Write one or more blocks out. The common case is writing a full
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* output block in a single write; increment the full block stats.
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* Otherwise, we're into partial block writes. If a partial write,
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* and it's a character device, just warn. If a tape device, quit.
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*
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* The partial writes represent two cases. 1: Where the input block
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* was less than expected so the output block was less than expected.
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* 2: Where the input block was the right size but we were forced to
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* write the block in multiple chunks. The original versions of dd(1)
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* never wrote a block in more than a single write, so the latter case
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* never happened.
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*
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* One special case is if we're forced to do the write -- in that case
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* we play games with the buffer size, and it's usually a partial write.
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*/
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outp = out.db;
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for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
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for (cnt = n;; cnt -= nw) {
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sparse = 0;
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if (ddflags & C_SPARSE) {
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sparse = 1; /* Is buffer sparse? */
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for (i = 0; i < cnt; i++)
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if (outp[i] != 0) {
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sparse = 0;
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break;
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}
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}
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if (sparse && !force) {
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pending += cnt;
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nw = cnt;
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} else {
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if (pending != 0) {
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if (force)
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pending--;
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if (lseek(out.fd, pending, SEEK_CUR) ==
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-1)
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err(2, "%s: seek error creating sparse file",
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out.name);
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if (force)
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write(out.fd, outp, 1);
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pending = 0;
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}
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if (cnt)
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nw = write(out.fd, outp, cnt);
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else
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return;
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}
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if (nw <= 0) {
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if (nw == 0)
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errx(1, "%s: end of device", out.name);
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if (errno != EINTR)
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err(1, "%s", out.name);
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nw = 0;
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}
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outp += nw;
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st.bytes += nw;
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if (nw == n) {
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if (n != out.dbsz)
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++st.out_part;
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else
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++st.out_full;
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break;
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}
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++st.out_part;
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if (nw == cnt)
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break;
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if (out.flags & ISTAPE)
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errx(1, "%s: short write on tape device",
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out.name);
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if (out.flags & ISCHR && !warned) {
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warned = 1;
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warnx("%s: short write on character device",
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out.name);
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}
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}
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if ((out.dbcnt -= n) < out.dbsz)
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break;
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}
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/* Reassemble the output block. */
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if (out.dbcnt)
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(void)memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
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out.dbp = out.db + out.dbcnt;
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}
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