c - Two semicolons inside a for-loop parentheses -

im customising code found on internet (it's adafruit tweet receipt). cannot understand many parts of code perplexing me for-loop 2 semicolons inside parentheses

boolean jsonparse(int depth, byte endchar) {   int c, i;   boolean readname = true;    for(;;) {  //<---------     while(isspace(c = timedread())); // scan past whitespace     if(c < 0) return false; // timeout     if(c == endchar) return true; // eod      if(c == '{') { // object follows       if(!jsonparse(depth + 1, '}')) return false;       if(!depth) return true; // end of file       if(depth == resultsdepth) { // end of object in results list 

what for(;;) mean? (it's arduino program guess it's in c)

for(;;) { } 

functionally means

 while (true) {  } 

it break loop/ return loop based on condition inside loop body.

the reason for(;;) loops forever because for has 3 parts, each of optional. first part initializes loop; second decides whether or not continue loop, , third @ end of each iteration. full form, typically see this:

for(i = 0; < 10; i++) 

if first (initialization) or last (end-of-iteration) parts missing, nothing done in place. if middle (test) part missing, acts though true there in place. for(;;) same for(;true;)', (as shown above) same while (true).