/* posix_fallocate() can leave a bunch of NULs at the end, so we cut that
* this assumes that offset == length of the file */
ftruncate(fileno(f), offset);
/* posix_fallocate() can leave a bunch of NULs at the end, so we cut that
* this assumes that offset == length of the file */
ftruncate(fileno(f), offset);