This block of code doesnt make sense!!

Code:

---

for( i=1,d=c; i && *c; c++ )
  i+=*c=='[', i-=*c==']';
if(!i) {
  c[-1]=0;
  while(a[p])
  {
      interpret(d);
  }
  c[-1]=']';
  break;
}

---

This is C code for an interpreter for the Brainf*** language, and [ is the beginning of the looping structure. I am making a superset to the language, called TripleHack, but I NEED to understand this looping structure. I can't figure out what this does! The code is in the middle of the interpret function. I took out all the unnecessary stuff.

Thank you


It is said that the only language all programmers understand is profanity.

In psudo code:

Code:

---

i = 1 at start of loop
d = address of c
while i <> 0 and data at address of c <> 0
  if data at address of c == '[' then add 1 to i, and subtract 1 from i if the data is ']'
end while
if i = 0 then
  the byte before the address of c = 0
  blah blah blah
  the byte before the address of c = ']'
  break
end if

---

Ill assume that c is a char*, with a line of code. What this code does is evaluate the code that is inside a series of brackets. It uses some pretty freaky stuff (ie, direct memory modification).

Z.