Method printf

libraries/AP_Common/ExpandingString.cpp:68–97

print into the buffer, expanding if needed */

  print into the buffer, expanding if needed
 */
void ExpandingString::printf(const char *format, ...)
{
    if (allocation_failed) {
        return;
    }
    if (buflen == used && !expand(0)) {
        return;
    }
    int n;

    /*
      print into the buffer, expanding the buffer if needed
     */
    while (true) {
        va_list arg;
        va_start(arg, format);
        n = hal.util->vsnprintf(&buf[used], buflen-used, format, arg);
        va_end(arg);
        if (n < 0) {
            return;
        }
        if (uint32_t(n) < buflen - used) {
            break;
        }
        if (!expand(n+1)) {            
            return;
        }
    }
    used += n;
}

/*
  print into the buffer, expanding if needed