Lua has a very simple C API. You can run Lua code and access lua objects from C. Similarly, you can access C functions and libraries from Lua. In this post, we’ll primarily look at how to expose C functions to lua.

Example Of Embedding Lua In C · GitHub
Lua 5.3 Manual

Install Lua

Aug 06, 2013 Lua is a pretty straight forward simple scripting language that can be implemented in a number of languages. Today I’m going to show you how easy it is to embed Lua in C. First thing you’re going to need to do is create a sane build environment by installing the Lua programming language and development packages. Blog Post - Embedding Lua in C. Here are all examples explained in my blog post. C Compiler (GCC or Clang) CMake = 2.8; Lua Development Library; How to Use. Inside the repository, create a build directory and change to the directory. I’m interested in hearing about your Lua/C usage! While this is a C article, I think you can implement most of the things mentioned here in your favourite language. I’ll use Lua C API and LuaBridge for examples, so I recommend to read the following articles if you’re not familiar with them: Using Lua with C (Part 1) Using Lua with C.

Let’s start off with the installation of lua. You can install lua using system package managers as

Mac:

Ubuntu:

Hon Shimeji, Brown Beech mushrooms, scientific name, Hypsizygus tessellatus is known as Buna-shimeji and Hypsizygus marmoreus. Though it is commercially identified as Hon Shimeji, true Hon Shimeji mushroom, of the species Lyophyllum shimeji, are mycorrhizal fungi and very difficult to cultivate, which has lead to patented cultivation methods. Our cultivated hon shimeji are delicate, small-capped tan and white mushrooms with a meaty texture and mild, slightly sweet flavor. You can use them any way you would regular button mushrooms. Saute and combine with cooked rice and scallions or serve in broth with braised cod or snapper. Hon Shimeji keep well in their wrapped containers for 2. Brown Beech (Hon-Shimeji) Harvested as a “bouquet”. Petite with all white or light brown caps with thin stems. Mild and crunchy in texture. Sweet and nutty. Chop off where they all come together or cluster. Caps and stems edible, separate them for cooking. Brown hon shimeji.

You can also build lua from source. However, you have to build lua as a shared library and this can be a bit tricky.

Lua Stack

Communication between lua and C is held through stacks with each element in stack representing lua value (nil, number, string, etc.).

For example, a C wrapped function c_swap is called in lua as:

In C, you will receive arguments in a stack as

You will then read the arguments from the stack as (indexing for this stack starts with 1 like in lua):

This is actually unsafe because these calls will fail if value in the stack at the specified index is not a number. Following code uses auxiliary library lauxlib.h and is safer; it will raise errors instead of segfaulting.

Then, you will process the arguments and push the results to stack.

Stack will now look like

Since you need to communicate the number of return value to lua, you will return 2. Lua will then know that top 2 values in the stack are the returned values.

The stack we’ve described is not global. Each function has its own stack.

Code

Let’s put all this together into main.c. main() Frp reset for samsung j 3 luna pro phone case. function illustrates how to run lua code from C.

And build and execute as If you have installed lua with apt-get, build using gcc main.c -o swap -llua5.2 -I/usr/include/lua5.2/

which should print

Library

In the above code, you’ve not really used lua interpretor; you’ve run the lua code in C itself.You might rather want to create a module which you can load into a lua interpretor using

Example Of Embedding Lua In C · GitHub

To do this, you’ll have to register your functions by creating a array of luaL_Reg and a function luaopen_mylib.

Let’s do this right away by editing main.c. We will also add additional mysin function.

⊕ This code works only for lua 5.2. For lua 5.1, please use luaL_register(L, 'mylib', mylib); instead of luaL_newlib(L, mylib);

Lua 5.3 Manual

Create a loadable .so file with

⊕ If you have installed lua with apt-get, build using gcc main.c -shared -o mylib.so -fPIC -llua5.2 -I/usr/include/lua5.2/

Dragonvale hack iphone download. You can now load this module in lua.

Now, you should be able to wrap any C library by writing a lua wrapper.We still have some caveats:

We will have to write a wrapping function for each of the functions in your C library to ‘parse’ the arguments(luaL_checknumber etc.). This is repetitive and can be a potential source for bugs.
C doesn’t have classes. What if your library is in C++? You cannot easily wrap classes like above. You will have to mess with metatables and so on.

A solution to both of these is to use Swig. Swig allows you to wrap C/C++ classes/functions into many languages like python, lua, java quite easily. In a later post, we will see how to use swig and wrap a simple library.

Embed Lua In C