X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=dd.c;h=33c45940ec7b7ab2a58fca523b100fc8c9d67949;hb=f14937d17796ca60fbd794c9c3ffe310b5a8993c;hp=07f092cc23c8d1e91053fefc5ba8bfc91352faee;hpb=9d3aba7b37b275350a9fe0887871da9ba73dcbd7;p=oweals%2Fbusybox.git diff --git a/dd.c b/dd.c index 07f092cc2..33c45940e 100644 --- a/dd.c +++ b/dd.c @@ -1,307 +1,234 @@ /* + * Mini dd implementation for busybox + * + * Copyright (C) 1999 by Lineo, inc. + * Written by Erik Andersen , + * 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. * - * The "dd" command, originally taken from sash. - * * Permission to distribute this code under the GPL has been granted. - * Majorly modified, and bugs fixed for busybox by Erik Andersen + * + * 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" -#ifdef BB_DD - -const char dd_usage[] = -"Copy a file, converting and formatting according to options\n\ -\n\ -usage: [if=name] [of=name] [bs=n] [count=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\ -\n\ -BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n"; - +#include "internal.h" #include -#include -#include #include -#include -#include - - -#define PAR_NONE 0 -#define PAR_IF 1 -#define PAR_OF 2 -#define PAR_BS 3 -#define PAR_COUNT 4 - - -typedef struct -{ - const char * name; - int value; -} PARAM; +#include +static const char dd_usage[] = +"dd [if=name] [of=name] [bs=n] [count=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"; -static const PARAM params[] = -{ - {"if", PAR_IF}, - {"of", PAR_OF}, - {"bs", PAR_BS}, - {"count", PAR_COUNT}, - {NULL, PAR_NONE} -}; -static long getNum(const char * cp); -extern int -dd_main (int argc, char **argv) +/* + * Read a number with a possible multiplier. + * Returns -1 if the number format is illegal. + */ +static long getNum (const char *cp) { - const char * str; - const PARAM * par; - const char * inFile; - const char * outFile; - char * cp; - int inFd; - int outFd; - int inCc=0; - int outCc; - int blockSize; - long count; - long intotal; - long outTotal; - unsigned char* buf; - unsigned char localBuf[BUF_SIZE]; - - inFile = NULL; - outFile = NULL; - blockSize = 512; - count = 1; - - - while (--argc > 0) - { - str = *++argv; - cp = strchr(str, '='); - - if (cp == NULL) - { - fprintf(stderr, "Bad dd argument\n"); - goto usage; - } - - *cp++ = '\0'; - - for (par = params; par->name; par++) - { - if (strcmp(str, par->name) == 0) - break; - } - - switch (par->value) - { - case PAR_IF: - if (inFile) - { - fprintf(stderr, "Multiple input files illegal\n"); - goto usage; - } - - //fprintf(stderr, "if=%s\n", cp); - inFile = cp; - break; - - case PAR_OF: - if (outFile) - { - fprintf(stderr, "Multiple output files illegal\n"); - goto usage; - } - - //fprintf(stderr, "of=%s\n", cp); - outFile = cp; - break; - - case PAR_BS: - blockSize = getNum(cp); - //fprintf(stderr, "bs=%d\n", blockSize); - - if (blockSize <= 0) - { - fprintf(stderr, "Bad block size value\n"); - goto usage; - } - - break; - - case PAR_COUNT: - count = getNum(cp); - //fprintf(stderr, "count=%ld\n", count); - - if (count < 0) - { - fprintf(stderr, "Bad count value\n"); - goto usage; - } - - break; - - default: - goto usage; - } - } + long value; - buf = localBuf; + if (!isDecimal (*cp)) + return -1; - if (blockSize > sizeof(localBuf)) - { - buf = malloc(blockSize); - - if (buf == NULL) - { - fprintf(stderr, "Cannot allocate buffer\n"); - return 1; - } - } + value = 0; - intotal = 0; - outTotal = 0; + while (isDecimal (*cp)) + value = value * 10 + *cp++ - '0'; - if (inFile == NULL) - inFd = STDIN; - else - inFd = open(inFile, 0); + switch (*cp++) { + case 'k': + value *= 1024; + break; - if (inFd < 0) - { - perror(inFile); - - if (buf != localBuf) - free(buf); - - return 1; - } + case 'b': + value *= 512; + break; - if (outFile == NULL) - outFd = STDOUT; - else - outFd = creat(outFile, 0666); + case 'w': + value *= 2; + break; - if (outFd < 0) - { - perror(outFile); - close(inFd); - - if (buf != localBuf) - free(buf); - - return 1; - } - - while ( outTotal < count*blockSize ) - { - inCc = read(inFd, buf, blockSize); - if (inCc < 0) { - perror(inFile); - goto cleanup; - } - //fprintf(stderr, "read in =%d\n", inCc); - 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; - } - //fprintf(stderr, "wrote out =%d\n", outCc); - - inCc -= outCc; - cp += outCc; - outTotal += outCc; - //fprintf(stderr, "outTotal=%ld\n", outTotal); - } - } - - if (inCc < 0) - perror(inFile); - -cleanup: - close(inFd); - - if (close(outFd) < 0) - perror(outFile); + case '\0': + return value; - if (buf != localBuf) - free(buf); + default: + return -1; + } - printf("%ld+%d records in\n", intotal / blockSize, - (intotal % blockSize) != 0); + if (*cp) + return -1; - printf("%ld+%d records out\n", outTotal / blockSize, - (outTotal % blockSize) != 0); - return 0; -usage: - - fprintf(stderr, "%s", dd_usage); - return 1; + return value; } -/* - * Read a number with a possible multiplier. - * Returns -1 if the number format is illegal. - */ -static long -getNum(const char * cp) +extern int dd_main (int argc, char **argv) { - 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; + const char *inFile; + const char *outFile; + char *cp; + int inFd; + int outFd; + int inCc = 0; + int outCc; + int skipBlocks; + int blockSize; + long count; + long intotal; + long outTotal; + unsigned char *buf; + + inFile = NULL; + outFile = NULL; + blockSize = 512; + skipBlocks = 0; + count = 1; + + + 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 %ld\n", count); + goto usage; + } + } + else if (strncmp(*argv, "bs", 2) == 0) { + blockSize = getNum ((strchr(*argv, '='))+1); + if (blockSize <= 0) { + fprintf (stderr, "Bad block size value %d\n", blockSize); + 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; + } - case 'w': - value *= 2; - break; + } +#endif + else { + goto usage; + } + argc--; + argv++; + } + if ( inFile == NULL || outFile == NULL) + goto usage; + + buf = malloc (blockSize); + if (buf == NULL) { + fprintf (stderr, "Cannot allocate buffer\n"); + exit( FALSE); + } + + intotal = 0; + outTotal = 0; + + if (inFile == NULL) + inFd = STDIN; + else + inFd = open (inFile, 0); + + if (inFd < 0) { + perror (inFile); + free (buf); + exit( FALSE); + } + + if (outFile == NULL) + outFd = 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; + } + 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; + } + + inCc -= outCc; + cp += outCc; + outTotal += outCc; + } + } - case '\0': - return value; + if (inCc < 0) + perror (inFile); - default: - return -1; - } + cleanup: + close (inFd); + close (outFd); + free (buf); - if (*cp) - return -1; + printf ("%ld+%d records in\n", intotal / blockSize, + (intotal % blockSize) != 0); + printf ("%ld+%d records out\n", outTotal / blockSize, + (outTotal % blockSize) != 0); + exit( TRUE); + usage: - return value; + fprintf (stderr, "%s", dd_usage); + exit( FALSE); } -#endif -/* END CODE */