** Integer modulus; return 'm % n'. (Assume that C '%' with ** negative operands follows C99 behavior. See previous comment ** about luaV_div.) */
| 453 | ** about luaV_div.) |
| 454 | */ |
| 455 | lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) { |
| 456 | if (l_castS2U(n) + 1u <= 1u) { /* special cases: -1 or 0 */ |
| 457 | if (n == 0) |
| 458 | luaG_runerror(L, "attempt to perform 'n%%0'"); |
| 459 | return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */ |
| 460 | } |
| 461 | else { |
| 462 | lua_Integer r = m % n; |
| 463 | if (r != 0 && (m ^ n) < 0) /* 'm/n' would be non-integer negative? */ |
| 464 | r += n; /* correct result for different rounding */ |
| 465 | return r; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | |
| 470 | /* number of bits in an integer */ |
no test coverage detected