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95 lines
2.0 KiB
ArmAsm
95 lines
2.0 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 15.11.2002
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;
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; Original C code by Marc 'BlackJack' Rintsch, 25.03.2001
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;
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; int __fastcall__ cbm_write(unsigned char lfn, void* buffer, unsigned int size)
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; {
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;
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; static unsigned int byteswritten;
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;
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; /* if we can't change to the outputchannel #lfn then return an error */
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; if (_oserror = cbm_k_ckout(lfn)) return -1;
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;
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; byteswritten = 0;
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;
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; while (byteswritten<size && !cbm_k_readst()) {
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; cbm_k_bsout(((unsigned char*)buffer)[byteswritten++]);
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; }
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;
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; if (cbm_k_readst()) {
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; _oserror = 5; /* device not present */
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; byteswritten = -1;
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; }
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;
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; cbm_k_clrch();
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;
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; return byteswritten;
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; }
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;
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.include "cbm.inc"
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.export _cbm_write
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.importzp ptr1, ptr2, ptr3
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.import popax, popa
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.import __oserror
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_cbm_write:
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sta ptr3
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stx ptr3+1 ; Save size
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inx
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stx ptr1+1
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tax
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inx
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stx ptr1 ; Save size with both bytes incremented separately
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jsr popax
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sta ptr2
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stx ptr2+1 ; Save buffer
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jsr popa
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tax
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jsr CKOUT
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bcs @E2 ; Branch on error
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bcc @L3 ; Branch always
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; Loop
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@L1: jsr READST
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cmp #0 ; Status ok?
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bne @E1
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ldy #0
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lda (ptr2),y ;
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inc ptr2
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bne @L2
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inc ptr2+1 ; A = *buffer++;
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@L2: jsr BSOUT ; cbm_k_bsout (A);
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@L3: dec ptr1 ; --size;
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bne @L1
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dec ptr1+1
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bne @L1
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jsr CLRCH
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lda ptr3
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ldx ptr3+1 ; return size;
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rts
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; Error entry, called when READST fails
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@E1: lda #5
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; Error entry, error code is in A
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@E2: sta __oserror
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lda #$FF
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tax
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rts ; return -1
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