Pebble - Integer to Char Array (i.e. String)

itoa.c

/*
  Pebble Doesn't support the default itoa included in the standard library.
  Here is a working implementation, allowing you to easily use an integer where a "string" is needed.

  Added from : http://forums.getpebble.com/discussion/comment/29591/
  Written by Pebble Forum User: FlashBIOS
  Gathered and Edited by: Sameer Chitley
  
  NOTE: It seems like it only supports positive numbers, so be sure to pass in the absolute value.
*/
char *itoa(int num)
{
  static char buff[20] = {};
  int i = 0, temp_num = num, length = 0;
  char *string = buff;
  
  if(num >= 0) { //See NOTE
    // count how many characters in the number
    while(temp_num) {
      temp_num /= 10;
      length++;
    }
    // assign the number to the buffer starting at the end of the 
    // number and going to the begining since we are doing the
    // integer to character conversion on the last number in the
    // sequence
    for(i = 0; i < length; i++) {
      buff[(length-1)-i] = '0' + (num % 10);
      num /= 10;
    }
    buff[i] = '\0'; // can't forget the null byte to properly end our string
  }
  else {
    return "Unsupported Number";
  }
  
  return string;
}