mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 00:29:31 +00:00
419eb700b5
The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.
108 lines
2.3 KiB
ArmAsm
108 lines
2.3 KiB
ArmAsm
;
|
|
; Oliver Schmidt, 12.01.2005
|
|
;
|
|
; int __fastcall__ read (int fd, void* buf, unsigned count);
|
|
;
|
|
|
|
.constructor initprompt
|
|
.export _read
|
|
.import rwprolog, rwcommon
|
|
.import RDKEY, COUT
|
|
|
|
.include "zeropage.inc"
|
|
.include "errno.inc"
|
|
.include "fcntl.inc"
|
|
.include "mli.inc"
|
|
.include "filedes.inc"
|
|
.include "apple2.inc"
|
|
|
|
.segment "ONCE"
|
|
|
|
initprompt:
|
|
; Set prompt <> ']' to let DOS 3.3 know that we're
|
|
; not in Applesoft immediate mode and thus keep it
|
|
; from scanning our device I/O for DOS commands.
|
|
lda #$80 ; Same value used at $D52C
|
|
sta PROMPT
|
|
rts
|
|
|
|
.code
|
|
|
|
_read:
|
|
; Get parameters
|
|
jsr rwprolog
|
|
bcs errno
|
|
tax ; Save fd
|
|
|
|
; Check for read access
|
|
lda fdtab + FD::FLAGS,y
|
|
and #O_RDONLY
|
|
beq einval
|
|
|
|
; Check for device
|
|
txa ; Restore fd
|
|
bmi device
|
|
|
|
; Do read
|
|
ldy #READ_CALL
|
|
jmp rwcommon
|
|
|
|
; Device succeeds always
|
|
device: lda #$00
|
|
sta __oserror
|
|
|
|
; Set counter to zero
|
|
sta ptr3
|
|
sta ptr3+1
|
|
|
|
; Check for zero count
|
|
lda ptr2
|
|
ora ptr2+1
|
|
beq check
|
|
|
|
; Read from device and echo to device
|
|
next: jsr RDKEY
|
|
jsr COUT
|
|
|
|
; Clear hi bit and check for '\r'
|
|
and #$7F
|
|
cmp #$0D
|
|
bne :+
|
|
|
|
; Replace with '\n' and set count to zero
|
|
lda #$0A
|
|
ldy #$00
|
|
sty ptr2
|
|
sty ptr2+1
|
|
|
|
; Put char into buf
|
|
: ldy #$00
|
|
sta (ptr1),y
|
|
|
|
; Increment pointer
|
|
inc ptr1
|
|
bne :+
|
|
inc ptr1+1
|
|
|
|
; Increment counter
|
|
: inc ptr3
|
|
bne check
|
|
inc ptr3+1
|
|
|
|
; Check for counter less than count
|
|
check: lda ptr3
|
|
cmp ptr2
|
|
bcc next
|
|
ldx ptr3+1
|
|
cpx ptr2+1
|
|
bcc next
|
|
|
|
; Return success, AX already set
|
|
rts
|
|
|
|
; Load errno code
|
|
einval: lda #EINVAL
|
|
|
|
; Set __errno
|
|
errno: jmp __directerrno
|