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308 lines
4.7 KiB
C
308 lines
4.7 KiB
C
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/*
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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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* Majorly modified, and bugs fixed for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com>
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*/
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#include "internal.h"
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#ifdef BB_DD
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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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\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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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#define PAR_NONE 0
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#define PAR_IF 1
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#define PAR_OF 2
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#define PAR_BS 3
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#define PAR_COUNT 4
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typedef struct
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{
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const char * name;
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int value;
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} PARAM;
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static const PARAM params[] =
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{
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{"if", PAR_IF},
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{"of", PAR_OF},
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{"bs", PAR_BS},
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{"count", PAR_COUNT},
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{NULL, PAR_NONE}
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};
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static long getNum(const char * cp);
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extern int
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dd_main (struct FileInfo *unused, int argc, char **argv)
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{
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const char * str;
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const PARAM * par;
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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 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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unsigned char localBuf[BUF_SIZE];
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inFile = NULL;
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outFile = NULL;
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blockSize = 512;
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count = 1;
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while (--argc > 0)
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{
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str = *++argv;
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cp = strchr(str, '=');
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if (cp == NULL)
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{
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fprintf(stderr, "Bad dd argument\n");
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goto usage;
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}
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*cp++ = '\0';
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for (par = params; par->name; par++)
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{
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if (strcmp(str, par->name) == 0)
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break;
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}
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switch (par->value)
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{
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case PAR_IF:
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if (inFile)
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{
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fprintf(stderr, "Multiple input files illegal\n");
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goto usage;
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}
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//fprintf(stderr, "if=%s\n", cp);
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inFile = cp;
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break;
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case PAR_OF:
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if (outFile)
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{
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fprintf(stderr, "Multiple output files illegal\n");
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goto usage;
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}
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//fprintf(stderr, "of=%s\n", cp);
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outFile = cp;
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break;
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case PAR_BS:
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blockSize = getNum(cp);
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//fprintf(stderr, "bs=%d\n", blockSize);
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if (blockSize <= 0)
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{
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fprintf(stderr, "Bad block size value\n");
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goto usage;
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}
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break;
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case PAR_COUNT:
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count = getNum(cp);
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//fprintf(stderr, "count=%ld\n", count);
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if (count < 0)
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{
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fprintf(stderr, "Bad count value\n");
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goto usage;
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}
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break;
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default:
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goto usage;
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}
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}
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buf = localBuf;
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if (blockSize > sizeof(localBuf))
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{
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buf = malloc(blockSize);
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if (buf == NULL)
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{
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fprintf(stderr, "Cannot allocate buffer\n");
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return 1;
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}
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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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{
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perror(inFile);
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if (buf != localBuf)
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free(buf);
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return 1;
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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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{
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perror(outFile);
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close(inFd);
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if (buf != localBuf)
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free(buf);
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return 1;
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}
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while ( outTotal < count*blockSize )
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{
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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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//fprintf(stderr, "read in =%d\n", inCc);
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intotal += inCc;
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cp = buf;
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while ( intotal > outTotal )
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{
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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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{
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perror(outFile);
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goto cleanup;
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}
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//fprintf(stderr, "wrote out =%d\n", outCc);
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inCc -= outCc;
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cp += outCc;
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outTotal += outCc;
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//fprintf(stderr, "outTotal=%ld\n", outTotal);
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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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if (close(outFd) < 0)
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perror(outFile);
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if (buf != localBuf)
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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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return 0;
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usage:
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fprintf(stderr, "%s", dd_usage);
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return 1;
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}
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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
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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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{
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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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#endif
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/* END CODE */
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