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49 lines
1.2 KiB
ArmAsm
49 lines
1.2 KiB
ArmAsm
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; Ullrich von Bassewitz, 31.05.2002
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; const char* __fastcall__ tgi_map_mode (unsigned char mode);
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; /* Map tgi mode codes to driver names */
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;
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.export _tgi_map_mode
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.import _tgi_mode_table
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.import return0
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.importzp tmp1
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;----------------------------------------------------------------------------
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; BEWARE: The current implementation of tgi_map_mode does not work with tables
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; larger that 255 bytes!
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.code
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_tgi_map_mode:
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sta tmp1 ; Save mode
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ldy #$00
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@L0: lda _tgi_mode_table,y
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beq NotFound ; Branch if mode code zero
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cmp tmp1
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beq Found
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; Skip the name
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@L1: iny
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lda _tgi_mode_table,y
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bne @L1 ; Loop until end marker found
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iny ; Skip end marker
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bne @L0 ; Branch always
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; Mode not found
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NotFound:
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jmp return0
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; Mode found
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Found: tya
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ldx #>_tgi_mode_table
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sec ; Account for the mode byte
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adc #<_tgi_mode_table ; Return pointer to file name
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rts
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