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05lv.s
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1980-02-17
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520b
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48 lines
/
/ OFF, INDEX, LV and NIL
/
_OFF:
bne 1f
mov (lc)+,r3
1:
add r3,(sp)
return
_INX4:
tst (sp)+ / should check bounds here
tst r3
_INX2:
bne 1f
mov (lc)+,r3
1:
mov (sp)+,r1
sub (lc)+,r1
bmi 1f
cmp r1,(lc)+
bgt 1f
mul r3,r1
add r1,(sp)
return
1:
mov $ESUBSCR,_perrno
error ESUBSCR
_NIL:
tst (sp)
beq 1f
return
1:
mov $ENILPTR,_perrno
error ENILPTR
_LV:
mov _display(r3),r0
add (lc)+,r0
mov r0,-(sp)
return
_INX4P2:
tst (sp)+
_INX2P2:
mov (sp)+,r0
sub (lc)+,r0
ash r3,r0
add r0,(sp)
return