if (!strncmp(neweq, "file:", 5)) {
set->appender = xbt_log_appender_file_new(neweq + 5);
}else if (!strncmp(neweq, "rollfile:", 9)) {
if (!strncmp(neweq, "file:", 5)) {
set->appender = xbt_log_appender_file_new(neweq + 5);
}else if (!strncmp(neweq, "rollfile:", 9)) {