Added logging to lua-side, logging library is complete

main.c

@@ -189,6 +189,7 @@ int initialize_everything(char* lua_file) {
 	OCT_LOG_INFO("Initialized lua state");
 	luaL_openlibs(L);
 	oct_tb_initialize_lua(L);
+	oct_log_init_lua(L);
 	if (luaL_dofile(L, lua_file)) return OCT_LUA_FILE_NOT_FOUND;
 	OCT_LOG_INFO("Begin running oct_init()");
 	lua_getglobal(L, "oct_init");

oct_log.c

@@ -1,6 +1,10 @@
 #include <stdio.h>
+#include <string.h>
+#include <lua5.3/lualib.h>
+#include <lua5.3/lauxlib.h>
 #include "oct_log.h"
 
+
 FILE* oct_log_output_file;
 int oct_log_level;
 
@@ -24,3 +28,40 @@ int oct_log_deinit() {
 	}
 	return 1;
 }
+
+int oct_log_init_lua(lua_State* L) {
+	lua_pushcfunction(L, oct_log_error_lua);
+	lua_setglobal(L, "OCT_LOG_ERROR");
+	lua_pushcfunction(L, oct_log_warning_lua);
+	lua_setglobal(L, "OCT_LOG_WARNING");
+	lua_pushcfunction(L, oct_log_info_lua);
+	lua_setglobal(L, "OCT_LOG_INFO");
+	lua_pushcfunction(L, oct_log_debug_lua);
+	lua_setglobal(L, "OCT_LOG_DEBUG");
+	return 1;
+}
+
+int oct_log_error_lua(lua_State* L) {
+	char buffer[OCT_LOG_MAX_MESSAGE_LENGTH_LUA];
+	strncpy(buffer, luaL_checkstring(L, -1), OCT_LOG_MAX_MESSAGE_LENGTH_LUA);
+	OCT_LOG_ERROR("%s", buffer);
+	return 1;
+}
+int oct_log_warning_lua(lua_State* L) {
+	char buffer[OCT_LOG_MAX_MESSAGE_LENGTH_LUA];
+	strncpy(buffer, luaL_checkstring(L, -1), OCT_LOG_MAX_MESSAGE_LENGTH_LUA);
+	OCT_LOG_WARNING("%s", buffer);
+	return 1;
+}
+int oct_log_info_lua(lua_State* L) {
+	char buffer[OCT_LOG_MAX_MESSAGE_LENGTH_LUA];
+	strncpy(buffer, luaL_checkstring(L, -1), OCT_LOG_MAX_MESSAGE_LENGTH_LUA);
+	OCT_LOG_INFO("%s", buffer);
+	return 1;
+}
+int oct_log_debug_lua(lua_State* L) {
+	char buffer[OCT_LOG_MAX_MESSAGE_LENGTH_LUA];
+	strncpy(buffer, luaL_checkstring(L, -1), OCT_LOG_MAX_MESSAGE_LENGTH_LUA);
+	OCT_LOG_DEBUG("%s", buffer);
+	return 1;
+}

oct_log.h

@@ -8,6 +8,10 @@
 #define OCT_LOG_LEVEL_INFO 2
 #define OCT_LOG_LEVEL_DEBUG 3
 
+#define OCT_LOG_MAX_MESSAGE_LENGTH_LUA 1024
+
+#include <lua5.3/lualib.h>
+
 extern FILE* oct_log_output_file;
 extern int oct_log_level;
 
@@ -43,4 +47,16 @@ extern int oct_log_level;
 int oct_log_init(char* filename, int level);
 int oct_log_deinit();
 
+// Logging on the C-side (oct_log_init) is initialized before lua
+// Thus, we have to have a separate function for initializing logging on the
+// lua-side that is called after lua is initialized
+int oct_log_init_lua(lua_State* L);
+
+// Can't call macros directly from lua, these are just wrapper functions
+// for the above macros
+int oct_log_error_lua(lua_State* L);
+int oct_log_warning_lua(lua_State* L);
+int oct_log_info_lua(lua_State* L);
+int oct_log_debug_lua(lua_State* L);
+
 #endif 

pong.lua

@@ -3,6 +3,8 @@ require("termbox_defs")
 
 math.randomseed(os.time())
 
+OCT_LOG_INFO("Hello, world! From lua");
+
 width = 74;
 height = 25;