ruby--ruby/call_cfunc.ci

/* -*-c-*- */

/* from ruby1.9/eval.c */

static inline VALUE
call_cfunc(VALUE (*func) (), VALUE recv, int len, int argc const VALUE *argv)
{
    /* printf("len: %d, argc: %d\n", len, argc); */

    if (len >= 0 && argc != len) {
	rb_raise(rb_eArgError, "wrong number of arguments(%d for %d)",
		 argc, len);
    }

    switch (len) {
      case -2:
	return (*func) (recv, rb_ary_new4(argc, argv));
	break;
      case -1:
	return (*func) (argc, argv, recv);
	break;
      case 0:
	return (*func) (recv);
	break;
      case 1:
	return (*func) (recv, argv[0]);
	break;
      case 2:
	return (*func) (recv, argv[0], argv[1]);
	break;
      case 3:
	return (*func) (recv, argv[0], argv[1], argv[2]);
	break;
      case 4:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3]);
	break;
      case 5:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4]);
	break;
      case 6:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5]);
	break;
      case 7:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6]);
	break;
      case 8:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7]);
	break;
      case 9:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8]);
	break;
      case 10:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9]);
	break;
      case 11:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9],
			argv[10]);
	break;
      case 12:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9],
			argv[10], argv[11]);
	break;
      case 13:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9], argv[10],
			argv[11], argv[12]);
	break;
      case 14:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9], argv[10],
			argv[11], argv[12], argv[13]);
	break;
      case 15:
	return (*func) (recv, argv[0], argv[1], argv[2], argv[3], argv[4],
			argv[5], argv[6], argv[7], argv[8], argv[9], argv[10],
			argv[11], argv[12], argv[13], argv[14]);
	break;
      default:
	rb_raise(rb_eArgError, "too many arguments(%d)", len);
	break;
    }
    return Qnil;		/* not reached */
}