extern	__imp__MessageBoxA@16
extern __imp__wsprintfA
extern	__imp__ExitProcess@4
global start
section .text
putflagPlus:
        mov byte[flags], 1
        jz flag
putflagMinus:
        mov byte[flags + 1], 1
        jz flag
putflagHashCode:
        mov byte[flags + 2], 1
        jz flag
putflagZero:
        mov byte[flags + 3], 1
        jz flag

percent:
        inc esi
        cmp byte[esi], '+'
        jz putflagPlus
        cmp byte[esi], '-'
        jz putflagMinus
        cmp byte[esi], '#'
        jz putflagHashCode
        cmp byte[esi], '0'
        jz putflagZero
        mov edx, [esi]
        sub edx, 48
        cmp edx, 9
        jbe digit
        cmp byte[esi], '.'
        jz point
        cmp byte[esi], 'd'
        jz formatD
        cmp byte[esi], 'i'
        jz formatI
        cmp byte[esi], 'x'
        jz formatX
        cmp byte[esi], 's'
        jz formatS
        cmp byte[esi], 'c'
        jz formatC
		cmp byte[esi], 'h'
		jz lenh
		cmp byte[esi], 'l'
		jz lenl
		cmp byte[esi], 'L'
		jz lenL
flag:
        inc esi
		jmp percent


digit:
        mov ecx, 0
		mov edx, [esi]
		sub edx, 48
		cmp edx, 9
		jbe cycleDigit
		cycleDigit:
			mov [wid + ecx], edx
			inc ecx
			inc esi
			jmp digit
        cmp byte[esi], 'd'
        jz formatD
        cmp byte[esi], 'i'
        jz formatI
        cmp byte[esi], 'x'
        jz formatX
        cmp byte[esi], 's'
        jz formatS
        cmp byte[esi], 'c'
        jz formatC
		cmp byte[esi], 'h'
		jz lenh
		cmp byte[esi], 'l'
		jz lenl
		cmp byte[esi], 'L'
		jz lenL
lenh:
		mov byte[lengths], 1
        inc esi
		jmp len
lenL:
		mov byte[lengths + 1], 1
        inc esi
		jmp len
lenl:
		mov byte[lengths + 2], 1
        inc esi
		jmp len
len:
		cmp byte[esi], 'd'
        jz formatD
        cmp byte[esi], 'i'
        jz formatI
        cmp byte[esi], 'x'
        jz formatX
        cmp byte[esi], 's'
        jz formatS
        cmp byte[esi], 'c'
        jz formatC
point:
        jmp toDigitPrecision

toDigitPrecision:
		inc esi
		mov ecx, 0
		mov edx, [esi]
		sub edx, 48
		cmp edx, 9
		jbe cycleDigitPrecision
		cycleDigitPrecision:
			mov [precision + ecx], edx
			inc ecx
			jmp toDigitPrecision
        cmp byte[esi], 'd'
        jz formatD
        cmp byte[esi], 'i'
        jz formatI
        cmp byte[esi], 'x'
        jz formatX
        cmp byte[esi], 's'
        jz formatS
        cmp byte[esi], 'c'
        jz formatC
		cmp byte[esi], 'h'
		jz lenh
		cmp byte[esi], 'l'
		jz lenl
		cmp byte[esi], 'L'
		jz lenL

formatS:
	mov edx, 0
	mov ecx, [parameters]
	step:
		cmp byte[ecx + edx], 0
		jz normal
		mov edi, [ecx + edx]
		mov [buf + edx], edi
		jmp step
	cmp word[esi], 0
	jnz normal
formatC:
formatD:
formatI:
formatX:

normal:
		mov byte[lengths], 0
		mov byte[lengths + 1], 0
		mov byte[lengths + 2], 0
        mov byte[flags], 0
        mov byte[flags + 1], 0
        mov byte[flags + 2], 0
        mov byte[flags + 3], 0
		jmp percent
sprintf:
        push esi
        push edi
        push ebx
        push ebp
        mov ebp, esp
        sub esp, 24; width(8), precision(12), len(16), flag
		wid equ ebp - 12 ; 4 bytes
		precision equ ebp - 16 ; 4 bytes
		parameters equ ebp + 16; 4 bytes
		lengths equ ebp - 8; 4 bytes
		buf equ ebp + 8
		flags equ ebp - 4
        mov esi, [ebp + 12]
		jmp normal
start:
	push s
	push f
	push res
	call sprintf
	pop eax
	pop ebx
	pop ecx
	push 0
	push prog_title
	push res
	push 0
	call	[__imp__MessageBoxA@16]

	push 0
	call	[__imp__ExitProcess@4]
section .data
res db "                    ",0
section .rodata
prog_title db "sprintf",0
f db "%s",0
s db "Hello",0
end