1 files changed, 22 insertions, 3 deletions

diff --git a/coreutils/dd.c b/coreutils/dd.c
index fc8b1dbb2..042355e24 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -466,6 +466,27 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
 
                 xmove_fd(xopen(outfile, oflag), ofd);
 
+#if ENABLE_PLATFORM_MINGW32
+                {
+                        off_t len = (off_t)seek * ((G.flags & FLAG_SEEK_BYTES) ? 1 : obs);
+                        struct stat st;
+                        int ret = fstat(ofd, &st);
+
+                        if (ret == 0 && !(G.flags & FLAG_APPEND) && len > st.st_size)
+                                make_sparse(ofd, st.st_size, len);
+
+                        if (seek && !(G.flags & FLAG_NOTRUNC)) {
+                                if (ftruncate(ofd, len) < 0) {
+                                        if (ret < 0
+                                         || S_ISREG(st.st_mode)
+                                         || S_ISDIR(st.st_mode)
+                                        ) {
+                                                goto die_outfile;
+                                        }
+                                }
+                        }
+                }
+#else
                 if (seek && !(G.flags & FLAG_NOTRUNC)) {
                         size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
                         if (ftruncate(ofd, seek * blocksz) < 0) {
@@ -479,6 +500,7 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
                                 }
                         }
                 }
+#endif
         } else {
                 outfile = bb_msg_standard_output;
         }
@@ -502,9 +524,6 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
         }
         if (seek) {
                 size_t blocksz = (G.flags & FLAG_SEEK_BYTES) ? 1 : obs;
-#if ENABLE_PLATFORM_MINGW32
-                seek_sparse(ofd, seek * blocksz);
-#endif
                 if (lseek(ofd, seek * blocksz, SEEK_CUR) < 0)
                         goto die_outfile;
         }