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annotate lib/alib/is_xdigit.a @ 2725:c2112f93923a lwtools-port

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o dwio for Atari now uses routines in ROM, so dwread/dwrite stripped of Atari o Added NMI code (as a conditional) to clock
author Boisy Pitre <boisy.pitre@nuance.com>
date Tue, 31 Jul 2012 11:54:02 -0500
parents 7d70b7e1cb21
children aaba193af04f
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1 *****************************************
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2
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3 * See if character in "B" is a hexdigit 0..9, A..F or a..f
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4
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5 * OTHER MODULES NEEDED: IS_DIGIT
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6
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7 * ENTRY: B=character to test
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8
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9 * EXIT: CC zero=1 if hex digit, 0 if not
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10
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11 nam Is Char a Hex Digit?
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12 ttl Assembler Library Module
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15 psect IS_XDIGIT,0,0,0,0,0
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18 IS_XDIGIT:
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19 pshs b
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20 lbsr IS_DIGIT
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21 beq exit digits are okay
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22 cmpb #'A
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23 blo exit exit, zero not set
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24 cmpb #'f
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25 bhi exit zero not set
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26 cmpb #'a
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27 bhs yes
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28 cmpb #'F
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29 bhi exit
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31 yes
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32 orcc #%00000100 set zero
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34 exit
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35 puls b,pc
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37 endsect
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