Fix portability bugs: char values passed to <ctype.h> functions must

Tom Lane <tgl@sss.pgh.pa.us>

Commit: cd632c983e588ca77eafc6e932670c075cbc892c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-01-04T04:17:14Z
Releases: 7.4.2
Fix portability bugs: char values passed to <ctype.h> functions must
be cast to unsigned char.  We have learned this the hard way before.

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