view lib/alib/is_alpha.as @ 3220:9ccec98c9897

Updated IDE Driver makefile so it will have place holders for dsk, dskclean, and dskcopy so that make does not error out when chaining into the driver tree to build disk images where applicable.
author David Ladd <drencor-xeen@users.sourceforge.net>
date Wed, 20 Dec 2017 16:10:50 -0600
parents 03f26e88b809
children
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*****************************************

* See if character in "B" is a alpha letter a..z or A..Z

* OTHER MODULES NEEDED: IS_LOWER, IS_UPPER

* ENTRY: B=character to test

* EXIT: CC zero=1 if alpha, 0 if not

 nam Is Char Alphabetic?
 ttl Assembler Library Module


 section .text


IS_ALPHA:
 lbsr IS_UPPER
 BEQ yes uppercase letters are alpha
 lbsr IS_LOWER last chance to set flags.

yes
 rts


 endsect