cfg_ptr_reverse
char* ptr = cfg_ptr_reverse((char*)opt);
char* cfg_ptr_reverse(char* str);
ptr = cfg_ptr_reverse($2);
ptr = cfg_ptr_reverse($2);
char* ptr = cfg_ptr_reverse((char*)opt);
char* cfg_ptr_reverse(char* str);
ptr = cfg_ptr_reverse($2);
ptr = cfg_ptr_reverse($2);