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191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini dd implementation for busybox
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*
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* Copyright (C) 1999, 2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* Based in part on code taken from sash.
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* Copyright (c) 1999 by David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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*
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* Permission to distribute this code under the GPL has been granted.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <features.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
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#include <inttypes.h>
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#else
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typedef unsigned long long int uintmax_t;
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#endif
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extern int dd_main(int argc, char **argv)
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{
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char *inFile = NULL;
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char *outFile = NULL;
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char *cp;
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int inFd;
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int outFd;
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int inCc = 0;
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int outCc;
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long blockSize = 512;
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uintmax_t skipBlocks = 0;
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uintmax_t seekBlocks = 0;
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uintmax_t count = (uintmax_t) - 1;
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uintmax_t intotal;
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uintmax_t outTotal;
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unsigned char *buf;
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argc--;
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argv++;
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/* Parse any options */
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while (argc) {
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if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
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inFile = ((strchr(*argv, '=')) + 1);
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else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
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outFile = ((strchr(*argv, '=')) + 1);
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else if (strncmp("count", *argv, 5) == 0) {
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count = getNum((strchr(*argv, '=')) + 1);
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if (count <= 0) {
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errorMsg("Bad count value %s\n", *argv);
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goto usage;
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}
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} else if (strncmp(*argv, "bs", 2) == 0) {
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blockSize = getNum((strchr(*argv, '=')) + 1);
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if (blockSize <= 0) {
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errorMsg("Bad block size value %s\n", *argv);
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goto usage;
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}
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} else if (strncmp(*argv, "skip", 4) == 0) {
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skipBlocks = getNum((strchr(*argv, '=')) + 1);
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if (skipBlocks <= 0) {
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errorMsg("Bad skip value %s\n", *argv);
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goto usage;
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}
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} else if (strncmp(*argv, "seek", 4) == 0) {
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seekBlocks = getNum((strchr(*argv, '=')) + 1);
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if (seekBlocks <= 0) {
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errorMsg("Bad seek value %s\n", *argv);
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goto usage;
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}
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} else {
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goto usage;
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}
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argc--;
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argv++;
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}
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buf = xmalloc(blockSize);
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intotal = 0;
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outTotal = 0;
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if (inFile == NULL)
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inFd = fileno(stdin);
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else
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inFd = open(inFile, 0);
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if (inFd < 0) {
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/* Note that we are not freeing buf or closing
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* files here to save a few bytes. This exits
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* here anyways... */
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/* free(buf); */
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fatalError( inFile);
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}
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if (outFile == NULL)
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outFd = fileno(stdout);
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else
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outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (outFd < 0) {
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/* Note that we are not freeing buf or closing
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* files here to save a few bytes. This exits
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* here anyways... */
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/* close(inFd);
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free(buf); */
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fatalError( outFile);
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}
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lseek(inFd, skipBlocks * blockSize, SEEK_SET);
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lseek(outFd, seekBlocks * blockSize, SEEK_SET);
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//
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//TODO: Convert to using fullRead & fullWrite
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// from utility.c
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// -Erik
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while (outTotal < count * blockSize) {
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inCc = read(inFd, buf, blockSize);
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if (inCc < 0) {
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perror(inFile);
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goto cleanup;
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} else if (inCc == 0) {
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goto cleanup;
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}
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intotal += inCc;
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cp = buf;
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while (intotal > outTotal) {
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if (outTotal + inCc > count * blockSize)
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inCc = count * blockSize - outTotal;
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outCc = write(outFd, cp, inCc);
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if (outCc < 0) {
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perror(outFile);
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goto cleanup;
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} else if (outCc == 0) {
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goto cleanup;
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}
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inCc -= outCc;
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cp += outCc;
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outTotal += outCc;
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}
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}
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if (inCc < 0)
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perror(inFile);
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cleanup:
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/* Note that we are not freeing memory or closing
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* files here, to save a few bytes. */
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#if 0
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close(inFd);
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close(outFd);
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free(buf);
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#endif
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printf("%ld+%d records in\n", (long) (intotal / blockSize),
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(intotal % blockSize) != 0);
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printf("%ld+%d records out\n", (long) (outTotal / blockSize),
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(outTotal % blockSize) != 0);
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exit(TRUE);
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usage:
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usage(dd_usage);
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}
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