Lua embedding example

lua_embed/.gitignore

@@ -0,0 +1 @@
+main

lua_embed/Makefile

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+CC = gcc
+CFLAGS = -Wall -O2
+
+TARGET = main
+SRC = main.c
+
+LDFLAGS += -lm
+LDFLAGS += -llua
+
+$(TARGET): $(SRC)
+	@echo CC $@
+	@$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f $(TARGET)

lua_embed/main.c

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+#include <lauxlib.h>
+#include <lua.h>
+#include <lualib.h>
+
+// A simple C function to add two numbers
+int c_add(lua_State *L) {
+    double a = luaL_checknumber(L, 1);
+    double b = luaL_checknumber(L, 2);
+    lua_pushnumber(L, a + b);
+    return 1; // one return value
+}
+
+int main(void) {
+    lua_State *L = luaL_newstate();
+    luaL_openlibs(L); // Load Lua standard libraries
+
+    const lua_Number ver = lua_version(NULL);
+
+    printf("Lua version: %.2f\n", ver);
+    printf("Lua version: %s\n", LUA_VERSION);
+
+    // Register the C function as a global Lua function
+    lua_register(L, "c_add", c_add);
+
+    // Run the Lua script
+    if (luaL_dofile(L, "script.lua") != LUA_OK) {
+        fprintf(stderr, "Error: %s\n", lua_tostring(L, -1));
+        lua_pop(L, 1); // remove error message
+    }
+
+    lua_close(L);
+    return 0;
+}

lua_embed/script.lua

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+local result = c_add(10, 25)
+print("Result from C function: " .. result)
+
+HereYouCan = {
+    "Execute Arbitrary Lua Code"
+}
+
+print(HereYouCan[1])