Test the character classifier added by c2e9364a06 (cleanup: add
isascii(), 2009-03-07). It returns 1 for NUL as well, which requires
special treatment, as our string-based tester can't find it with
strcmp(3). Allow NUL to be given as the first character in a class
specification string. This has the downside of no longer supporting
the empty string, but that's OK since we are not interested in testing
character classes with no members.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
d5071be5ed