bug#8103: NUL terminated lines

[Bjartur Thorlacius]

> Maybe we should modify tac to add the -z option.  Would you care to write a 
> patch?
It would be redundant, as tac -s $'\0' is equivalent.

If you want to switch between newline characters dynamically (a bad
idea, IMO) you could edit libc/stdio-common/getline.c to pass read in
the newline character from an environment variable.
More preferably, you could rewrite getline to read in self-delimeted lines.