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69 lines
1.6 KiB
ArmAsm
69 lines
1.6 KiB
ArmAsm
;
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; Christian Groessler, October 2000
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;
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; this file provides the _dio_phys_to_log function
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; (previously called _dio_chs_to_snum, so the filename)
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;
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; on the Atari this function is a dummy, it ignores
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; cylinder and head and returns as sector number the
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; sector number it got
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;
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; unsigned char __fastcall__ dio_phys_to_log(dhandle_t handle,
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; dio_phys_pos *physpos, /* input */
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; unsigned *sectnum); /* output */
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;
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; dhandle_t - 16bit (ptr)
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;
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.export _dio_phys_to_log
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.import popax,__oserror
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.importzp ptr1,ptr2,ptr3
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.include "atari.inc"
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.proc _dio_phys_to_log
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sta ptr1
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stx ptr1+1 ; pointer to result
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jsr popax
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sta ptr2
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stx ptr2+1 ; pointer to input structure
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jsr popax
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sta ptr3
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stx ptr3+1 ; pointer to handle
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ldy #sst_flag
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lda (ptr3),y
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and #128
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beq _inv_hand ; handle not open or invalid
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; ignore head and track and return the sector value
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ldy #diopp_sector
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lda (ptr2),y
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tax
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iny
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lda (ptr2),y
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ldy #1
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sta (ptr1),y
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dey
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txa
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sta (ptr1),y
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ldx #0
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txa
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ret:
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sta __oserror
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rts ; return success
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; invalid handle
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_inv_hand:
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ldx #0
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lda #BADIOC
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bne ret
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.endproc
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