A simple function to take a string chunk in arduino

arduino-split-str.cpp

String getChunk(String str, String delimiter, int index) {
    int prev_idx = 0;
    int idx = 0;
    String temp = str;
    String chunk;
    int i = 0;
    do {
        idx = temp.indexOf(delimiter);
        debug("idx =", String(idx));
        chunk = temp.substring(prev_idx, idx);
        debug("temp =", temp);
        debug("chunk =", chunk);
        temp = temp.substring(idx + 1);
        i++;
    } while(idx != -1 && i < index);
    return chunk;
}

// +CMGR: “REC READ”,”+21654130026”,,”04/08/28,22:26:29+40″
// String number = getChunk(str, ",", 2);
// => number = ”+21654130026”
// this would need some imporvements though (use pointer instead of strings)