- if (last_sparse) {
- do_lseek(f,-1,SEEK_CUR);
- return (write(f,&last_byte,1) == 1 ? 0 : -1);
+ int ret;
+
+ if (!sparse_seek)
+ return 0;
+
+#ifdef HAVE_FTRUNCATE
+ ret = do_ftruncate(f, size);
+#else
+ if (do_lseek(f, sparse_seek-1, SEEK_CUR) != size-1)
+ ret = -1;
+ else {
+ do {
+ ret = write(f, "", 1);
+ } while (ret < 0 && errno == EINTR);
+
+ ret = ret <= 0 ? -1 : 0;