mirror of
https://github.com/cc65/cc65.git
synced 2024-12-25 02:29:52 +00:00
806ffe5675
Tested on real KIM-1 hardware. read.s: - Remove commented out line. - Remove unused check for bell character. - Remove echo of newline (hardware always echoes entered characters). - This fixes gets() and fgets() so they return when CR is entered. write.s: - Fix check for adding return after linefeed (failed to work because OUTCHR changes A) - Remove unused check for bell character. kim1.inc: - Add symbol for monitor entry crt0.s: - Jump to KIM-1 monitor by address rather than using BRK (which relies on vector being set in RAM)
47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
;
|
|
; int __fastcall__ read (int fd, void* buf, unsigned count);
|
|
;
|
|
|
|
.include "kim1.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
|
|
and #$7F ; Clear top bit
|
|
cmp #$0D ; Check for '\r'
|
|
bne putch ; ...if CR character
|
|
lda #$0A ; Replace with '\n'
|
|
|
|
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
|