+/* vi: set sw=4 ts=4: */
/*
* Mini dd implementation for busybox
*
#include "internal.h"
+#include <features.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+#include <inttypes.h>
+#else
+typedef unsigned long long int uintmax_t;
+#endif
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";
+ "dd [if=name] [of=name] [bs=n] [count=n] [skip=n] [seek=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 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";
-/*
- * 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;
+ const char *inFile = NULL;
+ const 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;
- if (!isDecimal (*cp))
- return -1;
-
- value = 0;
-
- while (isDecimal (*cp))
- value = value * 10 + *cp++ - '0';
+ argc--;
+ argv++;
- switch (*cp++) {
- case 'k':
- value *= 1024;
- break;
+ /* 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;
+ }
+
+ } 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;
+ }
+
+ } else {
+ goto usage;
+ }
+ argc--;
+ argv++;
+ }
- case 'b':
- value *= 512;
- break;
+ buf = xmalloc(blockSize);
- case 'w':
- value *= 2;
- break;
+ intotal = 0;
+ outTotal = 0;
- case '\0':
- return value;
+ if (inFile == NULL)
+ inFd = fileno(stdin);
+ else
+ inFd = open(inFile, 0);
- default:
- return -1;
- }
+ if (inFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- if (*cp)
- return -1;
+ /* free(buf); */
+ fatalError( inFile);
+ }
- return value;
-}
+ if (outFile == NULL)
+ outFd = fileno(stdout);
+ else
+ outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (outFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
-extern int dd_main (int argc, char **argv)
-{
- 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;
- }
+ /* close(inFd);
+ free(buf); */
+ fatalError( outFile);
}
-#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;
- }
+ 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;
+ } 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;
+ }
}
-#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;
- }
- }
- if (inCc < 0)
- perror (inFile);
+ if (inCc < 0)
+ perror(inFile);
cleanup:
- close (inFd);
- close (outFd);
- free (buf);
-
- printf ("%ld+%d records in\n", intotal / blockSize,
- (intotal % blockSize) != 0);
- printf ("%ld+%d records out\n", outTotal / blockSize,
- (outTotal % blockSize) != 0);
- exit( TRUE);
+ /* 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
+
+ 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);
+ usage(dd_usage);
}
-
-