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annotate lib/alib/inkey.as @ 2831:7c8442122235 lwtools-port

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fix level 1 builds
author lfantoniosi
date Tue, 18 Jun 2013 21:41:46 -0400
parents 03f26e88b809
children
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1 ***************************************
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3 * Subroutine to input one character from std in. if ready
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4 * like an INKEY$...
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5
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6 * OTHER MODULES NEEDED: FGETC
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7
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8 * ENTRY: none
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11 * EXIT: A character, 0=no char
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12 * CC carry set if error (from I$Read)
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13 * B error code if any
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14
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15 nam Inkey
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16 ttl Assembler Library Module
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18
2782
aaba193af04f Updated code to use lwasm/lwlink
Boisy Pitre <boisy.pitre@nuance.com>
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19 section .text
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21 INKEY:
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22 clra std in
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23 ldb #SS.Ready
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24 os9 I$GetStt see if key ready
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25 bcc getit
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26 cmpb #E$NotRdy no keys ready=no error
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27 bne exit other error, report it
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28 clra no error
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29 bra exit
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31 getit
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32 lbsr FGETC go get the key
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33
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34 * this inst. needed since ctrl/: sometimes returns a null
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35 * usually callers are not expecting a null....
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37 tsta
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39 exit
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40 rts
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42 endsect
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