| 327 | |
| 328 | |
| 329 | LUA_API void lua_arith (lua_State *L, int op) { |
| 330 | lua_lock(L); |
| 331 | if (op != LUA_OPUNM && op != LUA_OPBNOT) |
| 332 | api_checknelems(L, 2); /* all other operations expect two operands */ |
| 333 | else { /* for unary operations, add fake 2nd operand */ |
| 334 | api_checknelems(L, 1); |
| 335 | setobjs2s(L, L->top, L->top - 1); |
| 336 | api_incr_top(L); |
| 337 | } |
| 338 | /* first operand at top - 2, second at top - 1; result go to top - 2 */ |
| 339 | luaO_arith(L, op, s2v(L->top - 2), s2v(L->top - 1), L->top - 2); |
| 340 | L->top--; /* remove second operand */ |
| 341 | lua_unlock(L); |
| 342 | } |
| 343 | |
| 344 | |
| 345 | LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) { |