+/* vi: set sw=4 ts=4: */
/*
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
+ * Mini dd implementation for busybox
*
- * The "dd" command, originally taken from sash.
+ * 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.
- * Majorly modified, and bugs fixed for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com>
+ *
+ * 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 <features.h>
#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-
-
-#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 <errno.h>
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+#include <inttypes.h>
+#else
+typedef unsigned long long int uintmax_t;
+#endif
-static const PARAM params[] =
-{
- {"if", PAR_IF},
- {"of", PAR_OF},
- {"bs", PAR_BS},
- {"count", PAR_COUNT},
- {NULL, PAR_NONE}
-};
+static const char dd_usage[] =
+ "dd [if=FILE] [of=FILE] [bs=N] [count=N] [skip=N] [seek=N]\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nCopy 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 stdout\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"
+ "\tseek=N\tskip N output blocks\n"
+ "\n"
+ "Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n"
+#endif
+ ;
-static long getNum(const char * cp);
-extern int
-dd_main (struct FileInfo *unused, int argc, char **argv)
+extern int dd_main(int argc, char **argv)
{
- 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;
-
+ char *inFile = NULL;
+ char *outFile = NULL;
+ char *cp;
+ 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) {
+ 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;
+ }
+ } else if (strncmp(*argv, "skip", 4) == 0) {
+ skipBlocks = getNum((strchr(*argv, '=')) + 1);
+ if (skipBlocks <= 0) {
+ fprintf(stderr, "Bad skip value %s\n", *argv);
+ goto usage;
+ }
- while (--argc > 0)
- {
- str = *++argv;
- cp = strchr(str, '=');
+ } else if (strncmp(*argv, "seek", 4) == 0) {
+ seekBlocks = getNum((strchr(*argv, '=')) + 1);
+ if (seekBlocks <= 0) {
+ fprintf(stderr, "Bad seek value %s\n", *argv);
+ goto usage;
+ }
- if (cp == NULL)
- {
- fprintf(stderr, "Bad dd argument\n");
+ } else {
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;
- }
+ argc--;
+ argv++;
}
- buf = localBuf;
-
- if (blockSize > sizeof(localBuf))
- {
- buf = malloc(blockSize);
-
- if (buf == NULL)
- {
- fprintf(stderr, "Cannot allocate buffer\n");
- return 1;
- }
- }
+ buf = xmalloc(blockSize);
intotal = 0;
outTotal = 0;
if (inFile == NULL)
- inFd = STDIN;
+ inFd = fileno(stdin);
else
- inFd = open(inFile, 0);
+ inFd = open(inFile, 0);
- if (inFd < 0)
- {
- perror(inFile);
-
- if (buf != localBuf)
- free(buf);
+ if (inFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- return 1;
+ /* free(buf); */
+ fatalError( inFile);
}
if (outFile == NULL)
- outFd = STDOUT;
+ outFd = fileno(stdout);
else
- outFd = creat(outFile, 0666);
-
- if (outFd < 0)
- {
- perror(outFile);
- close(inFd);
+ outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
- if (buf != localBuf)
- free(buf);
+ if (outFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- return 1;
+ /* close(inFd);
+ free(buf); */
+ fatalError( outFile);
}
- while ( outTotal < count*blockSize )
- {
+ lseek(inFd, skipBlocks * blockSize, SEEK_SET);
+ lseek(outFd, seekBlocks * blockSize, SEEK_SET);
+ //
+ //TODO: Convert to using fullRead & fullWrite
+ // from utility.c
+ // -Erik
+ while (outTotal < count * blockSize) {
inCc = read(inFd, buf, blockSize);
if (inCc < 0) {
- perror(inFile);
- goto cleanup;
+ perror(inFile);
+ goto cleanup;
+ } else if (inCc == 0) {
+ 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;
+ while (intotal > outTotal) {
+ if (outTotal + inCc > count * blockSize)
+ inCc = count * blockSize - outTotal;
outCc = write(outFd, cp, inCc);
- if (outCc < 0)
- {
+ if (outCc < 0) {
perror(outFile);
goto cleanup;
+ } else if (outCc == 0) {
+ 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:
+ cleanup:
+ /* Note that we are not freeing memory or closing
+ * files here, to save a few bytes. */
+#if 0
close(inFd);
+ close(outFd);
+ free(buf);
+#endif
- if (close(outFd) < 0)
- perror(outFile);
-
- if (buf != localBuf)
- free(buf);
-
- printf("%ld+%d records in\n", intotal / blockSize,
- (intotal % blockSize) != 0);
-
- printf("%ld+%d records out\n", outTotal / blockSize,
- (outTotal % blockSize) != 0);
- return 0;
-usage:
-
- fprintf(stderr, "%s", dd_usage);
- return 1;
-}
-
-
-/*
- * 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;
+ 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:
- return value;
+ usage(dd_usage);
}
-
-#endif
-/* END CODE */
-