K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2023-09-30T02:53:40.400183Z
K 7
svn:log
V 603
regcomp: use unsigned char when testing for escapes

- cast GETNEXT to unsigned where it is being promoted to int to prevent
  sign-extension (really it would have been better for PEEK*() and
  GETNEXT() to return unsigned char; this would have removed a ton of
  (uch) casts, but it is too intrusive for now).
- fix an isalpha that should have been iswalpha

PR:		264275, 274032
Reviewed by:	kevans, eugen (previous version)
Obtained from:	NetBSD

(cherry picked from commit 3fb80f1476c7776f04ba7ef6d08397cef6abcfb0)

Git Hash:   25307d6c927934dd44628e06cbc7047415fb6931
Git Author: christos@NetBSD.org
END