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---
title: Extend Lua with custom C functions using Clang
url: extend-lua-with-custom-c.html
date: 2023-05-23T12:00:00+02:00
type: note
draft: false
tags: [lua, c]
---
Here is a boilerplate for extending Lua with custom C functions. This requires
Clang and Lua 5.1 to be installed. GCC can be used instead of Clang, but the
Makefile will need to be modified.
- nativefunc.c
```c
#include <lua.h>
#include <lauxlib.h>
static int l_mult50(lua_State *L) {
double number = luaL_checknumber(L, 1);
lua_pushnumber(L, number * 50);
return 1;
}
int luaopen_nativefunc(lua_State *L) {
static const struct luaL_Reg nativeFuncLib[] = {{"mult50", l_mult50}, {NULL, NULL}};
luaL_register(L, "nativelib", nativeFuncLib);
return 1;
}
```
- main.lua
```lua
require "nativefunc"
print(nativelib.mult50(50))
```
- Makefile
```Makefile
CC = clang
CFLAGS =
INCLUDES = `pkg-config lua5.1 --cflags-only-I`
all:
$(CC) -shared -o nativefunc.so -fPIC nativefunc.c $(CFLAGS) $(INCLUDES)
clean:
rm *.so
```
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