/*
* 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.
*
typedef unsigned long long int uintmax_t;
#endif
-static const char dd_usage[] =
- "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";
-
-
-
extern int dd_main(int argc, char **argv)
{
- const char *inFile = NULL;
- const char *outFile = NULL;
- char *cp;
+ 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;
- uintmax_t outTotal;
- unsigned char *buf;
+ uintmax_t inTotal = 0;
+ uintmax_t outTotal = 0;
+ uintmax_t totalSize;
+ uintmax_t readSize;
+ unsigned char buf[BUFSIZ];
+ char *keyword = NULL;
argc--;
argv++;
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);
+ 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) {
- fprintf(stderr, "Bad block size value %s\n", *argv);
+ 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) {
- fprintf(stderr, "Bad skip value %s\n", *argv);
+ errorMsg("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);
+ 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;
}
argv++;
}
- buf = xmalloc(blockSize);
-
- intotal = 0;
- outTotal = 0;
-
if (inFile == NULL)
inFd = fileno(stdin);
else
inFd = open(inFile, 0);
if (inFd < 0) {
- perror(inFile);
- free(buf);
- exit(FALSE);
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
+
+ /* free(buf); */
+ fatalError( inFile);
}
if (outFile == NULL)
outFd = fileno(stdout);
else
- outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
if (outFd < 0) {
- perror(outFile);
- close(inFd);
- free(buf);
- exit(FALSE);
- }
+ /* 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);
- 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;
- }
+ /* close(inFd);
+ free(buf); */
+ fatalError( outFile);
}
- if (inCc < 0)
- perror(inFile);
-
- cleanup:
+ 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));
+ }
+ /* 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);
- free(buf);
+#endif
- printf("%ld+%d records in\n", (long) (intotal / blockSize),
- (intotal % blockSize) != 0);
+ 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);
projects / oweals / busybox.git / blobdiff