Breaking out of a loop from within a function called in that loop

Question

I\'m currently trying to figure out a way to break out of a for loop from within a function called in that loop. I\'m aware of the possibility to just have the

Answer 1

I believe it's related to how a break statement is translated into machine code. The break statement will be translated as a unconditional branch to the label immediately following the loop or switch.

mov ECX,5
label1:
  jmp <to next instruction address>  ;break
loop label1
<next instruction>

While the call to foo() from inside the loop will result in something like

mov ECX,5
label1:
  call <foo address>
loop label1
<next instruction>

and at foo address

call <printf address>
jmp <to where?> ;break cannot translate to any address.

Answer 2

If you cannot handle return values, can you at least add a Parameter to the function: I can imagine a solution like that:

void main (void)
{
  int a = 0;

  for (; 1 != a;)
  {
    foo(x, &a);
  } 
}

void foo( int x, int * a)
{
  if (succeeded)
  {
    /* set the break condition*/
    *a = 1;
  }
  else
  {
    *a = 0;
  }
}

It's my first post, so, please forgive me, if my formatting is messed up :)