mirror of
https://github.com/cc65/cc65.git
synced 2024-11-16 02:10:52 +00:00
54 lines
1.4 KiB
ArmAsm
54 lines
1.4 KiB
ArmAsm
;
|
|
; Wayne Parham (wayne@parhamdata.com)
|
|
;
|
|
; int __fastcall__ read (int fd, void* buf, unsigned count);
|
|
;
|
|
|
|
.include "sym1.inc"
|
|
|
|
.import popax, popptr1
|
|
.importzp ptr1, ptr2, ptr3
|
|
|
|
.export _read
|
|
|
|
.proc _read
|
|
|
|
sta ptr3
|
|
stx ptr3+1 ; Count in ptr3
|
|
inx
|
|
stx ptr2+1 ; Increment and store in ptr2
|
|
tax
|
|
inx
|
|
stx ptr2
|
|
jsr popptr1 ; Buffer address in ptr1
|
|
jsr popax
|
|
|
|
begin: dec ptr2
|
|
bne getch
|
|
dec ptr2+1
|
|
beq done ; If buffer full, return
|
|
|
|
getch: jsr INTCHR ; Get character using Monitor ROM call
|
|
jsr OUTCHR ; Echo it
|
|
and #$7F ; Clear top bit
|
|
cmp #$07 ; Check for '\a'
|
|
bne chkcr ; ...if BEL character
|
|
jsr BEEP ; Make beep sound
|
|
chkcr: cmp #$0D ; Check for '\r'
|
|
bne putch ; ...if CR character
|
|
lda #$0A ; Replace with '\n'
|
|
jsr OUTCHR ; and echo it
|
|
|
|
putch: ldy #$00 ; Put char into return buffer
|
|
sta (ptr1),y
|
|
inc ptr1 ; Increment pointer
|
|
bne begin
|
|
inc ptr1+1
|
|
bne begin
|
|
|
|
done: lda ptr3
|
|
ldx ptr3+1
|
|
rts ; Return count
|
|
|
|
.endproc
|