In general I consider the approach of a netmask length a typical case of over-optimzation - incl. the typical downside of an "unnecessary" bug. However as the optimization is already present I opted to not remove it but rather fix the bug:
So far the gateway was in usual environments only used if the target IP address differed already in the first byte from the local net IP addresses. Now the gateway is used correctly - even for i.e. the address 192.168.1.1 from the local net 192.168.0.x
- Tab chars were partially used with the unusual width of two blanks. I removed them altogether.
- Line endings were inconsistent even iniside individual files. I normalized them.
- I introduced a consistent coding style regarding comment indenting and blank line usage.
- I removed trailing spaces.
- I removed newlines following unnamed labels.
- ...
