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

think this was caused by opening the file in truncate mode.

1 files changed, 4 insertions, 5 deletions

diff --git a/coreutils/dd.c b/coreutils/dd.c
index 395f8c1e3..a7c8a2266 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -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),