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https://github.com/KolibriOS/kolibrios.git
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95 lines
1013 B
NASM
95 lines
1013 B
NASM
; LuhnA - Luhn algorithm
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; by Albom
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use32
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org 0
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db 'MENUET01'
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dd 1
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dd _start
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dd _end
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dd _memory
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dd _stack
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dd _param
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dd 0
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include '../../macros.inc'
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align 4
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_start:
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mov al, [_param]
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test al, al
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jz exit
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call luhna
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xor edx, edx
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mov ecx, 10
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div ecx
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test edx, edx
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jz valid
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mov ebx, msg_not
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jmp print
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valid:
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mov ebx, msg_valid
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print:
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mov [notifyapp+2*4], ebx
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mcall 70, notifyapp
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exit:
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mcall -1
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align 4
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luhna:
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xor edx, edx
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xor ecx, ecx
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xor eax, eax
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mov esi, _param
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@@:
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lodsb
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test al, al
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jz .exit
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sub al, '0'
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mov dl, [odd+eax]
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add ecx, edx
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lodsb
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test al, al
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jz .exit
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sub al, '0'
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add ecx, eax
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jmp @b
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.exit:
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mov eax, ecx
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ret
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align 4
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msg_not db 'NOT '
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msg_valid db 'VALID', 0
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align 4
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odd: db 0, 2, 4, 6, 8, 1, 3, 5, 7, 9
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align 4
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notifyapp:
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dd 7
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dd 0
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dd 0 ; ¤à¥á á®®¡é¥¨ï
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dd 0
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dd 0
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db '@notify', 0
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_end:
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align 4
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rb 256
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_stack:
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align 4
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_param rb 256
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_memory:
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