mirror of
https://github.com/cc65/cc65.git
synced 2024-07-03 06:29:36 +00:00
6d498d8187
to emulate these functions on platforms where one or more of these functions are not available (PET, CBM-II). git-svn-id: svn://svn.cc65.org/cc65/trunk@1544 b7a2c559-68d2-44c3-8de9-860c34a00d81
96 lines
2.1 KiB
ArmAsm
96 lines
2.1 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 15.11.2002
|
|
;
|
|
; Original C code by Marc 'BlackJack' Rintsch, 25.03.2001
|
|
;
|
|
; int __fastcall__ cbm_write(unsigned char lfn, void* buffer, unsigned int size)
|
|
; {
|
|
;
|
|
; static unsigned int byteswritten;
|
|
;
|
|
; /* if we can't change to the outputchannel #lfn then return an error */
|
|
; if (_oserror = cbm_k_ckout(lfn)) return -1;
|
|
;
|
|
; byteswritten = 0;
|
|
;
|
|
; while (byteswritten<size && !cbm_k_readst()) {
|
|
; cbm_k_bsout(((unsigned char*)buffer)[byteswritten++]);
|
|
; }
|
|
;
|
|
; if (cbm_k_readst()) {
|
|
; _oserror = 5; /* device not present */
|
|
; byteswritten = -1;
|
|
; }
|
|
;
|
|
; cbm_k_clrch();
|
|
;
|
|
; return byteswritten;
|
|
; }
|
|
;
|
|
|
|
.include "cbm.inc"
|
|
|
|
.export _cbm_write
|
|
.import CKOUT, READST, BSOUT, CLRCH
|
|
.importzp ptr1, ptr2, ptr3
|
|
.import popax, popa
|
|
.import __oserror
|
|
|
|
|
|
_cbm_write:
|
|
sta ptr3
|
|
stx ptr3+1 ; Save size
|
|
eor #$FF
|
|
sta ptr1
|
|
txa
|
|
eor #$FF
|
|
sta ptr1+1 ; Save -size-1
|
|
|
|
jsr popax
|
|
sta ptr2
|
|
stx ptr2+1 ; Save buffer
|
|
|
|
jsr popa
|
|
tax
|
|
jsr CKOUT
|
|
bcs @E2 ; Branch on error
|
|
bcc @L3 ; Branch always
|
|
|
|
; Loop
|
|
|
|
@L1: jsr READST
|
|
cmp #0 ; Status ok?
|
|
bne @E1
|
|
|
|
ldy #0
|
|
lda (ptr2),y ;
|
|
inc ptr2
|
|
bne @L2
|
|
inc ptr2+1 ; A = *buffer++;
|
|
|
|
@L2: jsr BSOUT ; cbm_k_bsout (A);
|
|
|
|
@L3: inc ptr1 ; --size;
|
|
bne @L1
|
|
inc ptr1+1
|
|
bne @L1
|
|
|
|
jsr CLRCH
|
|
|
|
lda ptr3
|
|
ldx ptr3+1 ; return size;
|
|
|
|
rts
|
|
|
|
; Error entry, called when READST fails
|
|
|
|
@E1: lda #5
|
|
|
|
; Error entry, error code is in A
|
|
|
|
@E2: sta __oserror
|
|
lda #$FF
|
|
tax
|
|
rts ; return -1
|
|
|