Mercurial > hg > Members > kono > nitros9-code

view lib/alib/is_xdigit.a @ 2765:0bd16cca86b7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Updated rules.mak for all the os9 format's to format the entire disk. People were having some issues with the disk images not being formatted to their full capacity and preventing some functions from working.
author drencor-xeen
date Thu, 17 Jan 2013 11:03:26 -0600
parents 7d70b7e1cb21
children aaba193af04f
line wrap: on
line source

*****************************************

* See if character in "B" is a hexdigit 0..9, A..F or a..f

* OTHER MODULES NEEDED: IS_DIGIT

* ENTRY: B=character to test

* EXIT: CC zero=1 if hex digit, 0 if not

 nam Is Char a Hex Digit?
 ttl Assembler Library Module


 psect IS_XDIGIT,0,0,0,0,0


IS_XDIGIT:
 pshs b
 lbsr IS_DIGIT 
 beq exit digits are okay
 cmpb #'A 
 blo exit exit, zero not set
 cmpb #'f
 bhi exit zero not set
 cmpb #'a 
 bhs yes
 cmpb #'F
 bhi exit
 
yes
 orcc #%00000100 set zero

exit
 puls b,pc

 endsect