mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
119 lines
2.6 KiB
ArmAsm
119 lines
2.6 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 16.11.2002
|
|
;
|
|
; int write (int fd, const void* buf, unsigned count);
|
|
;
|
|
|
|
.export _write
|
|
.constructor initstdout
|
|
|
|
.import SETLFS, OPEN, CKOUT, BSOUT, CLRCH
|
|
.import rwcommon
|
|
.import __oserror
|
|
.importzp sp, ptr1, ptr2, ptr3
|
|
|
|
.include "fcntl.inc"
|
|
.include "cbm.inc"
|
|
.include "filedes.inc"
|
|
|
|
|
|
;--------------------------------------------------------------------------
|
|
; initstdout: Open the stdout and stderr file descriptors for the screen.
|
|
|
|
.segment "INIT"
|
|
|
|
.proc initstdout
|
|
|
|
lda #LFN_WRITE
|
|
sta fdtab+STDOUT_FILENO
|
|
sta fdtab+STDERR_FILENO
|
|
lda #CBMDEV_SCREEN
|
|
sta unittab+STDOUT_FILENO
|
|
sta unittab+STDERR_FILENO
|
|
lda #STDOUT_FILENO + LFN_OFFS
|
|
jsr @L1
|
|
lda #STDERR_FILENO + LFN_OFFS
|
|
@L1: ldx #CBMDEV_SCREEN
|
|
ldy #$FF
|
|
jsr SETLFS
|
|
jmp OPEN ; Will always succeed
|
|
|
|
.endproc
|
|
|
|
;--------------------------------------------------------------------------
|
|
; _write
|
|
|
|
.code
|
|
|
|
.proc _write
|
|
|
|
jsr rwcommon ; Pop params, check handle
|
|
bcs errout ; Invalid handle, errno already set
|
|
|
|
; Check if the LFN is valid and the file is open for writing
|
|
|
|
adc #LFN_OFFS ; Carry is already clear
|
|
tax
|
|
lda fdtab-LFN_OFFS,x; Get flags for this handle
|
|
and #LFN_WRITE ; File open for writing?
|
|
beq notopen
|
|
|
|
; Valid lfn. Make it the output file
|
|
|
|
jsr CKOUT
|
|
bcs error
|
|
bcc @L2
|
|
|
|
; Output the next character from the buffer
|
|
|
|
@L0: ldy #0
|
|
lda (ptr2),y
|
|
inc ptr2
|
|
bne @L1
|
|
inc ptr2+1 ; A = *buf++;
|
|
@L1: jsr BSOUT
|
|
bcs error ; Bail out on errors
|
|
|
|
; Count characters written
|
|
|
|
inc ptr3
|
|
bne @L2
|
|
inc ptr3+1
|
|
|
|
; Decrement count
|
|
|
|
@L2: inc ptr1
|
|
bne @L0
|
|
inc ptr1+1
|
|
bne @L0
|
|
|
|
; Wrote all chars, close the output channel
|
|
|
|
jsr CLRCH
|
|
|
|
; Return the number of chars written
|
|
|
|
lda ptr3
|
|
ldx ptr3+1
|
|
rts
|
|
|
|
; Error entry, file is not open
|
|
|
|
notopen:
|
|
lda #3 ; File not open
|
|
bne error
|
|
|
|
; Error entry, status not ok
|
|
|
|
error5: lda #5 ; Device not present
|
|
error: sta __oserror
|
|
errout: lda #$FF
|
|
tax ; Return -1
|
|
rts
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
|