busybox/dd.c
Glenn L McGrath 06aeb6c417 ar.c now uses a linked list to process headers, uses getopt, new internal function extractAr(srcFD, dstFd, filename) to make it easily accessable to other busybox functions.
moved copySubFile from ar.c to utilities.c

modified dd.c to use fullWrite

modified copyFile in utilities.c to use copySubFile
2000-08-25 03:50:10 +00:00

162 lines
4.0 KiB
C

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