35 lines
378 B
NASM
35 lines
378 B
NASM
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format COFF
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use32
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public isdigit
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section '.code' code
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;; Function: isdigit
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;;
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;; Parameters:
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;;
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;; [esp+8] - character
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;;
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;; Returns:
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;;
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;; eax - 1 if digit otherwhise 0
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;;
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isdigit:
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push ebp
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mov ebp, esp
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mov al, '0'
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mov cl, byte [esp+8]
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cmp al, cl
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jb @f
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mov al, '9'
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cmp al, cl
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jg @f
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mov eax, 1
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jmp .end
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@@:
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xor eax, eax
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.end:
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leave
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ret
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