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comparison lib/alib/is_cntrl.a @ 2474:7d70b7e1cb21

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Moved net and alib files into here
author boisy
date Tue, 30 Mar 2010 02:44:42 +0000
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children aaba193af04f
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2473:dac1ff96637f 2474:7d70b7e1cb21
1 *****************************************
2
3 * See if character in "B" is a control character
4 * controls are defined as $00..$1F and $7F+
5
6 * OTHER MODULES NEEDED: none
7
8 * ENTRY: B=character to test
9
10 * EXIT: CC zero=1 if control, 0 if not
11
12 nam Is Char a Control?
13 ttl Assembler Library Module
14
15
16 psect IS_CNTRL,0,0,0,0,0
17
18
19 IS_CNTRL:
20 cmpb #$7f
21 bhs yes
22 cmpb #$1f
23 bhi exit not control, zero cleared
24
25 yes
26 orcc #%00000100 set zero
27
28 exit
29 rts
30
31 endsect
32