*loc = (unsigned char) op;
*loc = (US_CHAR_TYPE) op;
store_op2 (op, loc, arg1, arg2)    re_opcode_t op;    unsigned char *loc;    int arg1, arg2;{  *loc = (unsigned char) op;  STORE_NUMBER (loc + 1, arg1);  STORE_NUMBER (loc + 3, arg2);}