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-rw-r--r--coreutils/dd.c284
1 files changed, 140 insertions, 144 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 3e1024a..0d5b3e8 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -1,3 +1,4 @@
+/* vi: set sw=4 ts=4: */
/*
* Mini dd implementation for busybox
*
@@ -40,164 +41,159 @@ 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";
+ "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)
+
+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;
- 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;
- }
+ 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;
+
+ 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;
+ }
+
+ } 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++;
}
- 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;
- }
+ buf = malloc(blockSize);
+ if (buf == NULL) {
+ fprintf(stderr, "Cannot allocate buffer\n");
+ exit(FALSE);
}
- else {
- goto usage;
+
+ intotal = 0;
+ outTotal = 0;
+
+ if (inFile == NULL)
+ inFd = fileno(stdin);
+ else
+ inFd = open(inFile, 0);
+
+ if (inFd < 0) {
+ perror(inFile);
+ free(buf);
+ exit(FALSE);
}
- argc--;
- argv++;
- }
-
- buf = malloc (blockSize);
- if (buf == NULL) {
- fprintf (stderr, "Cannot allocate buffer\n");
- exit( FALSE);
- }
-
- intotal = 0;
- outTotal = 0;
-
- if (inFile == NULL)
- inFd = fileno(stdin);
- else
- inFd = open (inFile, 0);
-
- if (inFd < 0) {
- perror (inFile);
- free (buf);
- exit( FALSE);
- }
-
- if (outFile == NULL)
- outFd = fileno(stdout);
- else
- outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-
- if (outFd < 0) {
- perror (outFile);
- close (inFd);
- free (buf);
- exit( FALSE);
- }
-
- 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;
+
+ if (outFile == NULL)
+ outFd = fileno(stdout);
+ else
+ outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+
+ if (outFd < 0) {
+ perror(outFile);
+ close(inFd);
+ free(buf);
+ exit(FALSE);
}
- 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, 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;
+ }
}
- }
- if (inCc < 0)
- perror (inFile);
+ if (inCc < 0)
+ perror(inFile);
cleanup:
- close (inFd);
- close (outFd);
- free (buf);
-
- 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);
+ close(inFd);
+ close(outFd);
+ free(buf);
+
+ 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);
}
-
-
generated by cgit v1.1 at 2024-12-29 12:43:14 +0000