+/* vi: set sw=4 ts=4: */
/*
* Mini dd implementation for busybox
*
- * Copyright (C) 1999 by Lineo, inc.
+ * 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.
+ * 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.
*
*/
-#include "internal.h"
+#include "busybox.h"
#include <features.h>
#include <stdio.h>
#include <fcntl.h>
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 w (x2), k (x1024), b (x512), or m (x1024^2).\n";
-
-
-
-extern int dd_main (int argc, char **argv)
+extern int dd_main(int argc, char **argv)
{
- const char *inFile = NULL;
- const char *outFile = NULL;
- char *cp;
- int inFd;
- int outFd;
- int inCc = 0;
- int outCc;
- size_t blockSize = 512;
- //uintmax_t skipBlocks = 0;
- uintmax_t count = (uintmax_t)-1;
- uintmax_t intotal;
- uintmax_t outTotal;
- unsigned char *buf;
+ char *inFile = NULL;
+ char *outFile = NULL;
+ int inFd;
+ int outFd;
+ int inCc = 0;
+ int outCc;
+ int trunc=TRUE;
+ long blockSize = 512;
+ uintmax_t skipBlocks = 0;
+ uintmax_t seekBlocks = 0;
+ uintmax_t count = (uintmax_t) - 1;
+ uintmax_t inTotal = 0;
+ uintmax_t outTotal = 0;
+ uintmax_t totalSize;
+ uintmax_t readSize;
+ unsigned char buf[BUFSIZ];
+ char *keyword = NULL;
- 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;
- }
- }
-#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;
- }
-
- }
-#endif
- else {
- goto usage;
- }
argc--;
argv++;
- }
- buf = malloc (blockSize);
- if (buf == NULL) {
- fprintf (stderr, "Cannot allocate buffer\n");
- exit( FALSE);
- }
+ /* 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) {
+ errorMsg("Bad count value %s\n", *argv);
+ goto usage;
+ }
+ } else if (strncmp(*argv, "bs", 2) == 0) {
+ blockSize = getNum((strchr(*argv, '=')) + 1);
+ if (blockSize <= 0) {
+ errorMsg("Bad block size value %s\n", *argv);
+ goto usage;
+ }
+ } else if (strncmp(*argv, "skip", 4) == 0) {
+ skipBlocks = getNum((strchr(*argv, '=')) + 1);
+ if (skipBlocks <= 0) {
+ errorMsg("Bad skip value %s\n", *argv);
+ goto usage;
+ }
+
+ } else if (strncmp(*argv, "seek", 4) == 0) {
+ seekBlocks = getNum((strchr(*argv, '=')) + 1);
+ if (seekBlocks <= 0) {
+ errorMsg("Bad seek value %s\n", *argv);
+ goto usage;
+ }
+ } else if (strncmp(*argv, "conv", 4) == 0) {
+ keyword = (strchr(*argv, '=') + 1);
+ if (strcmp(keyword, "notrunc") == 0)
+ trunc=FALSE;
+ } else {
+ goto usage;
+ }
+ argc--;
+ argv++;
+ }
- intotal = 0;
- outTotal = 0;
+ if (inFile == NULL)
+ inFd = fileno(stdin);
+ else
+ inFd = open(inFile, 0);
- if (inFile == NULL)
- inFd = fileno(stdin);
- else
- inFd = open (inFile, 0);
+ if (inFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- if (inFd < 0) {
- perror (inFile);
- free (buf);
- exit( FALSE);
- }
+ /* free(buf); */
+ fatalPerror("%s", inFile);
+ }
- if (outFile == NULL)
- outFd = fileno(stdout);
- else
- outFd = creat (outFile, 0666);
+ if (outFile == NULL)
+ outFd = fileno(stdout);
+ else
+ outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
- if (outFd < 0) {
- perror (outFile);
- close (inFd);
- free (buf);
- exit( FALSE);
- }
+ if (outFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- //lseek(inFd, skipBlocks*blockSize, SEEK_SET);
- //
- //TODO: Convert to using fullRead & fullWrite
- // from utilitity.c
- // -Erik
- while (outTotal < count * blockSize) {
- inCc = read (inFd, buf, blockSize);
- if (inCc < 0) {
- perror (inFile);
- goto cleanup;
- } else if (inCc == 0) {
- goto cleanup;
+ /* close(inFd);
+ free(buf); */
+ fatalPerror("%s", outFile);
}
- 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;
+ lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
+ lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
+ totalSize=count*blockSize;
+ while ((readSize = totalSize - inTotal) > 0) {
+ if (readSize > BUFSIZ)
+ readSize=BUFSIZ;
+ inCc = fullRead(inFd, buf, readSize);
+ inTotal += inCc;
+ if ((outCc = fullWrite(outFd, buf, inCc)) < 1)
+ break;
+ outTotal += outCc;
+ }
+ if (trunc == TRUE) {
+ ftruncate(outFd, lseek(outFd, 0, SEEK_CUR));
}
- }
-
- if (inCc < 0)
- perror (inFile);
-
- cleanup:
- close (inFd);
- close (outFd);
- free (buf);
+ /* Note that we are not freeing memory or closing
+ * files here, to save a few bytes. */
+#ifdef BB_FEATURE_CLEAN_UP
+ close(inFd);
+ close(outFd);
+#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);
+ 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);
}
-
-
projects / oweals / busybox.git / blobdiff