luaL_newlibtable[-0, +1, m] void luaL_newlibtable (lua_State *L, const luaL_Reg l[]); Creates a new table with a size optimized to store all entries in the array l (but does not actually store them). It is intended to be used in conjunction with luaL_setfuncs (see luaL_newlib). It is implemented as a macro. The array l must be the actual array, not a pointer to it.

luaL_newmetatable[-0, +1, m] int luaL_newmetatable (lua_State *L, const char *tname); If the registry already has the key tname, returns 0. Otherwise, creates a new table to be used as a metatable for userdata, adds to this new table the pair __name = tname, adds to the registry the pair [tname] = new table, and returns 1. (The entry __name is used by some error-reporting functions.) In both cases pushes onto the stack the final value associated with tname in the registry.

luaL_newstate[-0, +0, –] lua_State *luaL_newstate (void); Creates a new Lua state. It calls lua_newstate with an allocator based on the standard C realloc function and then sets a panic function (see §4.6) that prints an error message to the standard error output in case of fatal errors. Returns the new state, or NULL if there is a memory allocation error.

luaL_openlibs[-0, +0, e] void luaL_openlibs (lua_State *L); Opens all standard Lua libraries into the given state.

luaL_opt[-0, +0, e] T luaL_opt (L, func, arg, dflt); This macro is defined as follows: (lua_isnoneornil(L,(arg)) ? (dflt) : func(L,(arg))) In words, if the argument arg is nil or absent, the macro results in the default dflt. Otherwise, it results in the result of calling func with the state L and the argument index arg as parameters. Note that it evaluates the expression dflt only if needed.

luaL_optinteger[-0, +0, v] lua_Integer luaL_optinteger (lua_State *L, int arg, lua_Integer d); If the function argument arg is an integer (or convertible to an integer), returns this integer. If this argument is absent or is nil, returns d. Otherwise, raises an error.

luaL_optlstring[-0, +0, v] const char *luaL_optlstring (lua_State *L, int arg, const char *d, size_t *l); If the function argument arg is a string, returns this string. If this argument is absent or is nil, returns d. Otherwise, raises an error. If l is not NULL, fills the position *l with the result's length. If the result is NULL (only possible when returning d and d == NULL), its length is considered

luaL_optnumber[-0, +0, v] lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d); If the function argument arg is a number, returns this number. If this argument is absent or is nil, returns d. Otherwise, raises an error.

luaL_optstring[-0, +0, v] const char *luaL_optstring (lua_State *L, int arg, const char *d); If the function argument arg is a string, returns this string. If this argument is absent or is nil, returns d. Otherwise, raises an error.

luaL_prepbuffer[-?, +?, m] char *luaL_prepbuffer (luaL_Buffer *B); Equivalent to luaL_prepbuffsize with the predefined size LUAL_BUFFERSIZE.