From cd6644ea4ddc78597934ab0ef5ba50e3c3daa927 Mon Sep 17 00:00:00 2001
From: Mitja Felicijan <m@mitjafelicijan.com>
Date: Sat, 8 Jul 2023 23:25:41 +0200
Subject: Moved to a simpler SSG

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 content/extend-lua-with-custom-c.md | 54 +++++++++++++++++++++++++++++++++++++
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 create mode 100644 content/extend-lua-with-custom-c.md

(limited to 'content/extend-lua-with-custom-c.md')

diff --git a/content/extend-lua-with-custom-c.md b/content/extend-lua-with-custom-c.md
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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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