bug#21266: [PATCH] dfa: simplify for non-POSIX locales

[Paul Eggert]

On 07/06/2016 09:14 PM, address@hidden wrote:
> Can you explain the story behind this? Why is support for non-ASCII 
> ranges being pulled out of dfa? I am concerned that this will affect gawk.

This new change shouldn't affect gawk, since that horse left the barn a 
couple of years ago (grep commit 
8b16e90a248d70aef687931370f8ef7c1f2bc4ef dated 2014-02-27). Because of 
that earlier change, when dfa.c sees a non-ASCII range it inserts a 
pattern that will bail out (just as it would for a back-reference), and 
the caller is then supposed to fall back on a backtracking matcher. I 
assume Gawk does this already.

The new change shouldn't alter the externally-visible behavior of 
dfa.c's entry points; it should merely simplify the dfa.c code given 
that dfa.c no longer has to worry about non-ASCII ranges etc.