10_3_gcc.asm

                public strlen
strlen          proc near

eos             = dword ptr -4
arg_0           = dword ptr  8

                push    ebp
                mov     ebp, esp
                sub     esp, 10h
                mov     eax, [ebp+arg_0]
                mov     [ebp+eos], eax

loc_80483F0:
                mov     eax, [ebp+eos]
                movzx   eax, byte ptr [eax]
                test    al, al
                setnz   al
                add     [ebp+eos], 1
                test    al, al
                jnz     short loc_80483F0
                mov     edx, [ebp+eos]
                mov     eax, [ebp+arg_0]
                mov     ecx, edx
                sub     ecx, eax
                mov     eax, ecx
                sub     eax, 1
                leave
                retn
strlen          endp