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// Process one line of incoming serial data, as the data becomes available. Performs an
// initial filtering by removing spaces and comments and capitalizing all letters.
while((c = serial_read()) != SERIAL_NO_DATA) {
  if ((c == '\n') || (c == '\r')) { // End of line reached

    protocol_execute_realtime(); // Runtime command check point.
    if (sys.abort) { return; } // Bail to calling function upon system abort

    line[char_counter] = 0; // Set string termination character.
    #ifdef REPORT_ECHO_LINE_RECEIVED
      report_echo_line_received(line);
    #endif

    // Direct and execute one line of formatted input, and report status of execution.
    if (line_flags & LINE_FLAG_OVERFLOW) {
      // Report line overflow error.
      report_status_message(STATUS_OVERFLOW);
    } else if (line[0] == 0) {
      // Empty or comment line. For syncing purposes.
      report_status_message(STATUS_OK);
    } else if (line[0] == '$') {
      // Grbl '$' system command
      report_status_message(system_execute_line(line));
    } else if (sys.state & (STATE_ALARM | STATE_JOG)) {
      // Everything else is gcode. Block if in alarm or jog mode.
      report_status_message(STATUS_SYSTEM_GC_LOCK);
    } else {
      // Parse and execute g-code block.
      report_status_message(gc_execute_line(line));
    }

    // Reset tracking data for next line.
    line_flags = 0;
    char_counter = 0;

  } else {

    if (line_flags) {
      // Throw away all (except EOL) comment characters and overflow characters.
      if (c == ')') {
        // End of '()' comment. Resume line allowed.
        if (line_flags & LINE_FLAG_COMMENT_PARENTHESES) { line_flags &= ~(LINE_FLAG_COMMENT_PARENTHESES); }
      }
    } else {
      if (c <= ' ') {
        // Throw away whitepace and control characters
      } else if (c == '/') {
        // Block delete NOT SUPPORTED. Ignore character.
        // NOTE: If supported, would simply need to check the system if block delete is enabled.
      } else if (c == '(') {
        // Enable comments flag and ignore all characters until ')' or EOL.
        // NOTE: This doesn't follow the NIST definition exactly, but is good enough for now.
        // In the future, we could simply remove the items within the comments, but retain the
        // comment control characters, so that the g-code parser can error-check it.
        line_flags |= LINE_FLAG_COMMENT_PARENTHESES;
      } else if (c == ';') {
        // NOTE: ';' comment to EOL is a LinuxCNC definition. Not NIST.
        line_flags |= LINE_FLAG_COMMENT_SEMICOLON;
      // TODO: Install '%' feature
      // } else if (c == '%') {
        // Program start-end percent sign NOT SUPPORTED.
        // NOTE: This maybe installed to tell Grbl when a program is running vs manual input,
        // where, during a program, the system auto-cycle start will continue to execute
        // everything until the next '%' sign. This will help fix resuming issues with certain
        // functions that empty the planner buffer to execute its task on-time.
      } else if (char_counter >= (LINE_BUFFER_SIZE-1)) {
        // Detect line buffer overflow and set flag.
        line_flags |= LINE_FLAG_OVERFLOW;
      } else if (c >= 'a' && c <= 'z') { // Upcase lowercase
        line[char_counter++] = c-'a'+'A';
      } else {
        line[char_counter++] = c;
      }
    }

  }
}

// If there are no more characters in the serial read buffer to be processed and executed,
// this indicates that g-code streaming has either filled the planner buffer or has
// completed. In either case, auto-cycle start, if enabled, any queued moves.
protocol_auto_cycle_start();

protocol_execute_realtime();  // Runtime command check point.
if (sys.abort) { return; } // Bail to main() program loop to reset system.