Nested functions

[Vortex]

Here is a quick example of nested functions :

Code: [Select]

.386
.model flat,stdcall
option casemap:none

includelib  \PellesC\lib\Win\kernel32.lib
includelib  msvcrt.lib

ExitProcess PROTO :DWORD
printf      PROTO C :DWORD,:VARARG
TestFunc    PROTO :DWORD,:DWORD

.data

s1          db 'Result = %u',0

retx MACRO a

    db      0C2h,a,0

ENDM

.code

start:

    invoke  TestFunc,98,3
    invoke  printf,ADDR s1,eax
    invoke  ExitProcess,0
    ret

TestFunc PROC x:DWORD,y:DWORD

    push    y
    push    x
    call    Substract
    shl     eax,1 ; z=2*(x-y)
    ret

Substract: ; PROC a:DWORD,b:DWORD

    mov     eax,DWORD PTR [esp+4]
    sub     eax,DWORD PTR [esp+8]
    retx    8
   
; Substract ENDP

TestFunc ENDP

END start