Assuming you are terminating strings with a NUL, for 0: it may be advantageous to R/W mmap with copy-on-write (i.e. MAP_PRIVATE). Then you can overwrite LF or C

Assuming you are terminating strings with a NUL, for 0: it may be advantageous to R/W mmap with copy-on-write (i.e. MAP_PRIVATE). Then you can overwrite LF or CRLF with a NUL.