mirror of
https://github.com/sheumann/hush.git
synced 2024-08-26 12:29:04 +00:00
230 lines
4.8 KiB
C
230 lines
4.8 KiB
C
/*
|
|
* Mini dd implementation for busybox
|
|
*
|
|
* Copyright (C) 1999 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 <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
|
|
static const char dd_usage[] =
|
|
"dd [if=name] [of=name] [bs=n] [count=n]\n\n"
|
|
"Copy a file, converting and formatting according to options\n\n"
|
|
"\tif=FILE\tread from FILE instead of stdin\n"
|
|
"\tof=FILE\twrite to FILE instead of stout\n"
|
|
"\tbs=n\tread and write N BYTES at a time\n"
|
|
"\tcount=n\tcopy only n input blocks\n"
|
|
//"\tskip=n\tskip n input blocks\n"
|
|
"\n"
|
|
"BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n";
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Read a number with a possible multiplier.
|
|
* Returns -1 if the number format is illegal.
|
|
*/
|
|
static long getNum (const char *cp)
|
|
{
|
|
long value;
|
|
|
|
if (!isDecimal (*cp))
|
|
return -1;
|
|
|
|
value = 0;
|
|
|
|
while (isDecimal (*cp))
|
|
value = value * 10 + *cp++ - '0';
|
|
|
|
switch (*cp++) {
|
|
case 'k':
|
|
value *= 1024;
|
|
break;
|
|
|
|
case 'b':
|
|
value *= 512;
|
|
break;
|
|
|
|
case 'w':
|
|
value *= 2;
|
|
break;
|
|
|
|
case '\0':
|
|
return value;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
if (*cp)
|
|
return -1;
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
extern int dd_main (int argc, char **argv)
|
|
{
|
|
const char *inFile = NULL;
|
|
const char *outFile = NULL;
|
|
char *cp;
|
|
int inFd;
|
|
int outFd;
|
|
int inCc = 0;
|
|
int outCc;
|
|
size_t blockSize = 512;
|
|
//uintmax_t skipBlocks = 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) {
|
|
fprintf (stderr, "Bad count value %s\n", *argv);
|
|
goto usage;
|
|
}
|
|
}
|
|
else if (strncmp(*argv, "bs", 2) == 0) {
|
|
blockSize = getNum ((strchr(*argv, '='))+1);
|
|
if (blockSize <= 0) {
|
|
fprintf (stderr, "Bad block size value %s\n", *argv);
|
|
goto usage;
|
|
}
|
|
}
|
|
#if 0
|
|
else if (strncmp(*argv, "skip", 4) == 0) {
|
|
skipBlocks = atoi( *argv);
|
|
if (skipBlocks <= 0) {
|
|
fprintf (stderr, "Bad skip value %d\n", skipBlocks);
|
|
goto usage;
|
|
}
|
|
|
|
}
|
|
#endif
|
|
else {
|
|
goto usage;
|
|
}
|
|
argc--;
|
|
argv++;
|
|
}
|
|
|
|
buf = malloc (blockSize);
|
|
if (buf == NULL) {
|
|
fprintf (stderr, "Cannot allocate buffer\n");
|
|
exit( FALSE);
|
|
}
|
|
|
|
intotal = 0;
|
|
outTotal = 0;
|
|
|
|
if (inFile == NULL)
|
|
inFd = fileno(stdin);
|
|
else
|
|
inFd = open (inFile, 0);
|
|
|
|
if (inFd < 0) {
|
|
perror (inFile);
|
|
free (buf);
|
|
exit( FALSE);
|
|
}
|
|
|
|
if (outFile == NULL)
|
|
outFd = fileno(stdout);
|
|
else
|
|
outFd = creat (outFile, 0666);
|
|
|
|
if (outFd < 0) {
|
|
perror (outFile);
|
|
close (inFd);
|
|
free (buf);
|
|
exit( FALSE);
|
|
}
|
|
|
|
//lseek(inFd, skipBlocks*blockSize, SEEK_SET);
|
|
while (outTotal < count * blockSize) {
|
|
inCc = read (inFd, buf, blockSize);
|
|
if (inCc < 0) {
|
|
perror (inFile);
|
|
goto cleanup;
|
|
} else if (inCc == 0) {
|
|
goto cleanup;
|
|
}
|
|
intotal += inCc;
|
|
cp = buf;
|
|
|
|
while (intotal > outTotal) {
|
|
if (outTotal + inCc > count * blockSize)
|
|
inCc = count * blockSize - outTotal;
|
|
outCc = write (outFd, cp, inCc);
|
|
if (outCc < 0) {
|
|
perror (outFile);
|
|
goto cleanup;
|
|
} else if (outCc == 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
inCc -= outCc;
|
|
cp += outCc;
|
|
outTotal += outCc;
|
|
}
|
|
}
|
|
|
|
if (inCc < 0)
|
|
perror (inFile);
|
|
|
|
cleanup:
|
|
close (inFd);
|
|
close (outFd);
|
|
free (buf);
|
|
|
|
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);
|
|
}
|
|
|
|
|