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52 lines
1.1 KiB
ArmAsm
52 lines
1.1 KiB
ArmAsm
;
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; jede jede@oric.org 2017-01-22
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;
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.export _read
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.import popax
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.include "zeropage.inc"
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.include "telestrat.inc"
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.include "fcntl.inc"
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;int read (int fd, void* buf, unsigned count);
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.proc _read
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sta ptr1 ; count
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stx ptr1+1 ; count
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jsr popax ; get buf
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sta PTR_READ_DEST
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stx PTR_READ_DEST+1
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sta ptr2 ; in order to calculate nb of bytes read
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stx ptr2+1 ;
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jsr popax ; fp pointer don't care in this version
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cpx #$00
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bne @is_not_stdin
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cmp #STDIN_FILENO
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bne @is_not_stdin
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; stdin
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@L1:
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BRK_TELEMON XRD0 ; waits until key is pressed
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bcs @L1
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rts
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@is_not_stdin:
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lda ptr1 ;
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ldy ptr1+1 ;
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BRK_TELEMON XFREAD ; calls telemon30 routine
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; compute nb of bytes read
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lda PTR_READ_DEST+1
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sec
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sbc ptr2+1
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tax
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lda PTR_READ_DEST
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sec
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sbc ptr2
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; Here A and X contains number of bytes read
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rts
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.endproc
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