1#include "lua-5.4.8/src/lua.h"
 2#include "lua-5.4.8/src/lualib.h"
 3#include "lua-5.4.8/src/lauxlib.h"
 4
 5#include "hi.h"
 6
 7static int l_sum(lua_State *L) {
 8	double a = luaL_checknumber(L, 1);
 9	double b = luaL_checknumber(L, 2);
10	lua_pushnumber(L, a + b);
11	return 1;
12}
13
14int main(void) {
15	lua_State *L = luaL_newstate();
16	luaL_openlibs(L);
17
18	// You do not need to prefix name of the function with `c_`. I did it to
19	// make it clear in the lua script code that this is a custom function.
20	lua_register(L, "c_sum", l_sum);
21
22	// Not wise since this is not a null-terminated string.
23	/* luaL_dostring(L, (const char*)hi); */
24
25	// https://www.lua.org/manual/5.4/manual.html#luaL_loadbuffer
26	// Load Lua chunk from `hi` buffer.
27	if (luaL_loadbuffer(L, (const char*)hi, hi_len, "hi_chunk") != LUA_OK) {
28		fprintf(stderr, "Load error: %s\n", lua_tostring(L, -1));
29		lua_pop(L, 1);
30	} else {
31		// Execute the chunk.
32		if (lua_pcall(L, 0, 0, 0) != LUA_OK) {
33			fprintf(stderr, "Runtime error: %s\n", lua_tostring(L, -1));
34			lua_pop(L, 1);
35		}
36	}
37
38	lua_close(L);
39	return 0;
40}