rem: ecasv_format_string = arg;
add: ecasv_format_string = string(arg.begin() + 3, arg.end());
context: void ecasv_parse_command_line(int argc, char *argv[]){  COMMAND_LINE cline = COMMAND_LINE (argc, argv);  if (cline.size() == 0 ||      cline.has("--version") ||      cline.has("--help") ||      cline.has("-h")) {    ecasv_print_usage();    exit(1);  }  ecasv_enable_debug = false;  ecasv_enable_cumulative_mode = false;  ecasv_rate_msec = 0;   ecasv_buffersize = 0;  cline.begin();  cline.next(); // 1st argument  while (cline.end() != true) {    string arg = cline.current();    if (arg.size() > 0) {      if (arg[0] != '-') {	if (ecasv_input == "")	  ecasv_input = arg;	else	  if (ecasv_output == "")	    ecasv_output = arg;      }      else {	string prefix = kvu_get_argument_prefix(arg);	if (prefix == "b") 	  ecasv_buffersize = atol(kvu_get_argument_number(1, arg).c_str());	if (prefix == "c") ecasv_enable_cumulative_mode = true;	if (prefix == "d") ecasv_enable_debug = true;	if (prefix == "f")	  ecasv_format_string = arg;	if (prefix == "r") 	  ecasv_rate_msec = atol(kvu_get_argument_number(1, arg).c_str());      }    }    cline.next();  }  ecasv_fill_defaults();}