mirror of https://github.com/cc65/cc65.git
67 lines
1.3 KiB
ArmAsm
67 lines
1.3 KiB
ArmAsm
;
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; Colin Leroy-Mira, 2024
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;
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; int __fastcall__ fputc (int c, FILE* f);
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;
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.export _fputc
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.importzp ptr1
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.import _write, checkferror
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.import pushax, pusha0, popax, incsp2
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.import pushptr1, popptr1, returnFFFF
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.include "stdio.inc"
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.include "_file.inc"
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_fputc:
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sta ptr1
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stx ptr1+1
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jsr popax ; Get char, as we'll have
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sta c ; to return it anyway
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stx c+1
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jsr checkferror
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bne ret_eof
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jsr pushptr1 ; Backup fp pointer
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; Push _write 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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; Write
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jsr _write
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; Check for errors
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cmp #$01
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bne set_ferror
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; Return char
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lda c
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ldx #$00
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jmp incsp2 ; Drop fp pointer copy
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ret_eof:
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jmp returnFFFF
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set_ferror:
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jsr popptr1
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lda #_FERROR
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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 2
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