bug#22655: grep-2.21 (and git master): --null-data and ranges work in an odd way (-P works fine)

[Sergei Trofimovich]

The issue is found by Ulrich Mueller:

It seems DFA engine does not understand --null-data:

~/dev/git/grep $ cat a-test.sh 
#!/bin/bash

printf '12\n34\0' | LC_ALL=en_US.utf-8 src/grep -z    '^[1234yz]*$'  | wc -c
printf '12\n34\0' | LC_ALL=en_US.utf-8 src/grep -P -z '^[1234yz]*$'  | wc -c
printf '12\n34\0' | LC_ALL=en_US.utf-8 src/grep -z    '^[1234y-z]*$' | wc -c
printf '12\n34\0' | LC_ALL=en_US.utf-8 src/grep -P -z '^[1234y-z]*$' | wc -c

~/dev/git/grep $ ./a-test.sh 
0
6
6
6

All 4 should return 6 but first is not correct.
It seems that 'y-z' range disables dfa.c code and works fine.

-- 

  Sergei

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