compile lua shared object into embeded c

Question

i have this code (zstring.c)

#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include <string.h>

static int zst_strlen(lua_State *L)
{
    size_t len;
    len = strlen(lua_tostring(L, 1));
    lua_pushnumber(L, len);
    return 1;
}

int luaopen_zstring(lua_State *L) 
{
    lua_register(L,"zst_strlen", zst_strlen);
    return 0;
}

and this is my lua embedded

int main (){
    L = luaL_newstate();
    luaL_openlibs(L);
    luaL_dofile(L, "test.lua");
    lua_close(L);
    return 0;
}

i do not want compile zstring.c to zstring.so object

i want zstring.c compile into my embedded lua then i can call zstring from test.lua and use it

how to do it?

score 1 · Accepted Answer · 2014-04-30 22:36:25Z

1

You can accomplish this by including the zstring source file then calling luaopen_zstring after initializing Lua:

#include "zstring.c"

int main (){
    L = luaL_newstate();
    luaL_openlibs(L);
    lua_pushcfunction(L, luaopen_zstring);
    lua_call(L, 0, 0);
    luaL_dofile(L, "test.lua");
    lua_close(L);
    return 0;
}

It should be noted that even if you do not want to generate a shared library, you can still create an object file for zstring (by using the -c flag with gcc, for example). You can then link that object file with your main source.

The steps for doing this are roughly:

Compile zstring.c to an object file (e.g. gcc -c -o zstring.o zstring.c)

Create a header file named zstring.h:

#ifndef ZSTRING_H
#define ZSTRING_H
int luaopen_zstring(lua_State *L);
#endif

Include the header in your main source file:

#include "zstring.h"

int main (){
    L = luaL_newstate();
    luaL_openlibs(L);
    lua_pushcfunction(L, luaopen_zstring);
    lua_call(L, 0, 0);
    luaL_dofile(L, "test.lua");
    lua_close(L);
    return 0;
}

Compile the main file with the zstring.o object file linked (e.g. gcc -o myprogram main.c zstring.o)

edited Apr 30, 2014 at 22:36

answered Apr 30, 2014 at 10:57

user142162

Sign up to request clarification or add additional context in comments.

1 Comment

Etan Reisner Over a year ago

Do not call luaopen_* functions directly, call them through lua. While it may work (and certainly will for this luaopen_zstring function) it is better practice to always call them the normal way. The canonical way to do this is to edit the linit.c file included in the lua sources to add the desired modules to the list that luaL_openlibs loads.

Collectives™ on Stack Overflow

compile lua shared object into embeded c

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related