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Using seek=? used to cause part of the original file to be zero'ed, i

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think this was caused by opening the file in truncate mode.
This commit is contained in:
Glenn L McGrath
2000-09-10 04:39:37 +00:00
parent 0ae8e5a645
commit 18310f1ce3
2 changed files with 8 additions and 10 deletions
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9
coreutils/dd.c
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@@ -57,6 +57,7 @@ extern int dd_main(int argc, char **argv)
uintmax_t totalSize;
uintmax_t readSize;
unsigned char buf[BUFSIZ];
off_t jumped;
argc--;
argv++;
@@ -117,7 +118,7 @@ extern int dd_main(int argc, char **argv)
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) {
/* Note that we are not freeing buf or closing
@@ -129,10 +130,9 @@ extern int dd_main(int argc, char **argv)
fatalError( outFile);
}
lseek(inFd, skipBlocks * blockSize, SEEK_SET);
lseek(outFd, seekBlocks * blockSize, SEEK_SET);
lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
jumped = lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
totalSize=count*blockSize;
printf("totalsize is %d\n",(int) totalSize);
while ((readSize = totalSize - inTotal) > 0) {
if (readSize > BUFSIZ)
readSize=BUFSIZ;
@@ -148,7 +148,6 @@ extern int dd_main(int argc, char **argv)
#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
close(outFd);
free(buf);
#endif
printf("%ld+%d records in\n", (long) (inTotal / blockSize),

9
dd.c
View File

@@ -57,6 +57,7 @@ extern int dd_main(int argc, char **argv)
uintmax_t totalSize;
uintmax_t readSize;
unsigned char buf[BUFSIZ];
off_t jumped;
argc--;
argv++;
@@ -117,7 +118,7 @@ extern int dd_main(int argc, char **argv)
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) {
/* Note that we are not freeing buf or closing
@@ -129,10 +130,9 @@ extern int dd_main(int argc, char **argv)
fatalError( outFile);
}
lseek(inFd, skipBlocks * blockSize, SEEK_SET);
lseek(outFd, seekBlocks * blockSize, SEEK_SET);
lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
jumped = lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
totalSize=count*blockSize;
printf("totalsize is %d\n",(int) totalSize);
while ((readSize = totalSize - inTotal) > 0) {
if (readSize > BUFSIZ)
readSize=BUFSIZ;
@@ -148,7 +148,6 @@ extern int dd_main(int argc, char **argv)
#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
close(outFd);
free(buf);
#endif
printf("%ld+%d records in\n", (long) (inTotal / blockSize),