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45 lines
1.1 KiB
ArmAsm
45 lines
1.1 KiB
ArmAsm
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; Ullrich von Bassewitz, 17.11.2002
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;
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; Common stuff for the read/write routines
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;
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.export rwcommon
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3, tmp2
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.include "errno.inc"
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.include "filedes.inc"
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;--------------------------------------------------------------------------
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; rwcommon: Pop the parameters from stack, preprocess them and place them
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; into zero page locations. Return carry set if the handle is invalid,
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; return carry clear if it is ok. If the carry is clear, the handle is
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; returned in A.
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.proc rwcommon
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eor #$FF
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sta ptr2
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txa
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eor #$FF
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sta ptr2+1 ; Remember -count-1
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jsr popptr1 ; Get buf to ptr1, Y=0 by call
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sty ptr3
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sty ptr3+1 ; Clear ptr3
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jsr popax ; Get the handle
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cpx #$01
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bcs @L9
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cmp #MAX_FDS ; Set carry if fd too large
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sta tmp2
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@L9: rts ; Return with result in carry
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.endproc
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