lua_pushfstring[-0, +1, e] const char *lua_pushfstring (lua_State *L, const char *fmt, ...); Pushes onto the stack a formatted string and returns a pointer to this string. It is similar to the ISO C function sprintf, but has some important differences: You do not have to allocate space for the result: the result is a Lua string and Lua takes care of memory allocation (and deallocation, through garbage collection). The conversion specifiers are quite restricted. There are no flags, widths

lua_pushcfunction[-0, +1, –] void lua_pushcfunction (lua_State *L, lua_CFunction f); Pushes a C function onto the stack. This function receives a pointer to a C function and pushes onto the stack a Lua value of type function that, when called, invokes the corresponding C function. Any function to be callable by Lua must follow the correct protocol to receive its parameters and return its results (see lua_CFunction).

lua_pushcclosure[-n, +1, m] void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n); Pushes a new C closure onto the stack. When a C function is created, it is possible to associate some values with it, thus creating a C closure (see §4.4); these values are then accessible to the function whenever it is called. To associate values with a C function, first these values must be pushed onto the stack (when there are multiple values, the first value is pushed first). Then lua_pushcclosur

lua_pushboolean[-0, +1, –] void lua_pushboolean (lua_State *L, int b); Pushes a boolean value with value b onto the stack.

lua_pop[-n, +0, –] void lua_pop (lua_State *L, int n); Pops n elements from the stack.

lua_pcallk[-(nargs + 1), +(nresults|1), –] int lua_pcallk (lua_State *L, int nargs, int nresults, int msgh, lua_KContext ctx, lua_KFunction k); This function behaves exactly like lua_pcall, but allows the called function to yield (see §4.7).

lua_pcall[-(nargs + 1), +(nresults|1), –] int lua_pcall (lua_State *L, int nargs, int nresults, int msgh); Calls a function in protected mode. Both nargs and nresults have the same meaning as in lua_call. If there are no errors during the call, lua_pcall behaves exactly like lua_call. However, if there is any error, lua_pcall catches it, pushes a single value on the stack (the error object), and returns an error code. Like lua_call, lua_pcall always removes the function and its arguments f

lua_numbertointeger int lua_numbertointeger (lua_Number n, lua_Integer *p); Converts a Lua float to a Lua integer. This macro assumes that n has an integral value. If that value is within the range of Lua integers, it is converted to an integer and assigned to *p. The macro results in a boolean indicating whether the conversion was successful. (Note that this range test can be tricky to do correctly without this macro, due to roundings.) This macro may evaluate its arguments more than once.

lua_Number typedef ... lua_Number; The type of floats in Lua. By default this type is double, but that can be changed to a single float or a long double. (See LUA_FLOAT_TYPE in luaconf.h.)

lua_next[-1, +(2|0), e] int lua_next (lua_State *L, int index); Pops a key from the stack, and pushes a key–value pair from the table at the given index (the "next" pair after the given key). If there are no more elements in the table, then lua_next returns 0 (and pushes nothing). A typical traversal looks like this: /* table is in the stack at index 't' */ lua_pushnil(L); /* first key */ while (lua_next(L, t) != 0) { /* uses 'key' (at index -2) and 'value' (at index -1) */ printf("%