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216 lines
4.1 KiB
C
216 lines
4.1 KiB
C
/*
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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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* The "dd" command, originally taken from sash.
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*
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* Permission to distribute this code under the GPL has been granted.
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* Mostly rewritten and bugs fixed for busybox by Erik Andersen <andersee@debian.org>
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*/
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#include "internal.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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const char dd_usage[] =
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"Copy a file, converting and formatting according to options\n\
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\n\
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usage: [if=name] [of=name] [bs=n] [count=n]\n\
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\tif=FILE\tread from FILE instead of stdin\n\
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\tof=FILE\twrite to FILE instead of stout\n\
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\tbs=n\tread and write N BYTES at a time\n\
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\tcount=n\tcopy only n input blocks\n\
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\tskip=n\tskip n input blocks\n\
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\n\
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BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n";
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/*
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* Read a number with a possible multiplier.
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* Returns -1 if the number format is illegal.
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*/
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static long getNum (const char *cp)
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{
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long value;
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if (!isDecimal (*cp))
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return -1;
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value = 0;
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while (isDecimal (*cp))
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value = value * 10 + *cp++ - '0';
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switch (*cp++) {
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case 'k':
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value *= 1024;
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break;
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case 'b':
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value *= 512;
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break;
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case 'w':
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value *= 2;
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break;
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case '\0':
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return value;
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default:
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return -1;
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}
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if (*cp)
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return -1;
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return value;
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}
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extern int dd_main (int argc, char **argv)
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{
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const char *inFile;
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const char *outFile;
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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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int skipBlocks;
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int blockSize;
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long count;
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long intotal;
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long outTotal;
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unsigned char *buf;
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inFile = NULL;
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outFile = NULL;
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blockSize = 512;
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skipBlocks = 0;
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count = 1;
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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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fprintf (stderr, "Bad count value %ld\n", count);
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goto usage;
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}
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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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fprintf (stderr, "Bad block size value %d\n", blockSize);
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goto usage;
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}
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}
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else if (strncmp(*argv, "skip", 4) == 0) {
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skipBlocks = atoi( *argv);
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if (skipBlocks <= 0) {
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fprintf (stderr, "Bad skip value %d\n", skipBlocks);
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goto usage;
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}
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}
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else {
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fprintf (stderr, "Got here. argv=%s\n", *argv);
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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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if ( inFile == NULL || outFile == NULL)
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goto usage;
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buf = malloc (blockSize);
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if (buf == NULL) {
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fprintf (stderr, "Cannot allocate buffer\n");
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exit( FALSE);
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}
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intotal = 0;
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outTotal = 0;
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if (inFile == NULL)
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inFd = 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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perror (inFile);
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free (buf);
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exit( FALSE);
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}
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if (outFile == NULL)
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outFd = STDOUT;
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else
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outFd = creat (outFile, 0666);
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if (outFd < 0) {
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perror (outFile);
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close (inFd);
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free (buf);
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exit( FALSE);
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}
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//lseek(inFd, skipBlocks*blockSize, SEEK_SET);
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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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}
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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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}
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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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close (inFd);
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close (outFd);
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free (buf);
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printf ("%ld+%d records in\n", intotal / blockSize,
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(intotal % blockSize) != 0);
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printf ("%ld+%d records out\n", outTotal / blockSize,
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(outTotal % blockSize) != 0);
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exit( TRUE);
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usage:
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fprintf (stderr, "%s", dd_usage);
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exit( FALSE);
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}
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