mirror of https://github.com/nmlgc/ReC98.git
36 lines
448 B
NASM
36 lines
448 B
NASM
; int __cdecl tolower(int ch)
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_tolower proc
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@@ch = word ptr dPtrSize + 2
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push bp
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mov bp, sp
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push si
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push di
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mov dx, [bp+@@ch]
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cmp dx, -1
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jnz short @@isupper
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mov ax, -1
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jmp short @@ret
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@@isupper:
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mov al, dl
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mov ah, 0
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mov bx, ax
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test (__ctype+1)[bx], 4
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jz short @@ret_ch
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mov al, dl
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mov ah, 0
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add ax, 20h
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jmp short @@ret
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@@ret_ch:
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mov al, dl
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mov ah, 0
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@@ret:
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pop di
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pop si
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pop bp
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ret
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_tolower endp
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