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93 lines
1.8 KiB
ArmAsm
93 lines
1.8 KiB
ArmAsm
;
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; Colin Leroy-Mira, 2024
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;
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; int __fastcall__ fgetc (register FILE* f)
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;
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.export _fgetc
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.import _read, pusha0, pushax, popptr1, incsp2, returnFFFF
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.importzp ptr1
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.include "stdio.inc"
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.include "_file.inc"
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_fgetc:
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sta ptr1
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stx ptr1+1
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jsr pushax ; Backup our ptr
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ldy #_FILE::f_flags
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lda (ptr1),y
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tax
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and #_FOPEN ; Check for file open
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beq ret_eof
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txa
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and #(_FERROR|_FEOF); Check for error/eof
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bne ret_eof
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txa
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and #_FPUSHBACK ; Check for pushed back char
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beq do_read
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txa
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and #<(~_FPUSHBACK) ; Reset flag
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sta (ptr1),y
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.assert _FILE::f_pushback = _FILE::f_flags+1, error
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iny
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jsr incsp2 ; Drop our ptr copy
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lda (ptr1),y ; Return pushed back char
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ldx #$00
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rts
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do_read:
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; Push _read parameters
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ldy #_FILE::f_fd
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lda (ptr1),y
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jsr pusha0
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lda #<c
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ldx #>c
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jsr pushax
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lda #$01
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ldx #$00
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; Read
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jsr _read
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; Check for errors
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cmp #$00
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beq set_feof
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cmp #<(-1)
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beq set_ferror
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jsr incsp2
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; Return char
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ldx #$00
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lda c
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rts
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ret_eof:
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jsr incsp2
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jmp returnFFFF
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set_ferror:
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lda #_FERROR
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bne set_err
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set_feof:
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lda #_FEOF
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set_err:
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pha
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jsr popptr1
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pla
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ldy #_FILE::f_flags
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ora (ptr1),y
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sta (ptr1),y
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jmp returnFFFF
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.bss
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c: .res 1
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