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/*
** $Id: loadlib.c,v 1.1 2003/03/17 13:01:48 roberto Exp roberto $
** Bare-bones dynamic library loader for Lua
** See Copyright Notice in lua.h
*
* This Lua library exports a single function, called loadlib, which is
* called from Lua as loadlib(lib,init), where lib is the full name of the
* library to be loaded (including the complete path) and init is the name
* of a function to be called after the library is loaded. Typically, this
* function will register other functions, thus making the complete library
* available to Lua. The init function is *not* automatically called by
* loadlib. Instead, loadlib returns the init function as a Lua function
* that the client can call when it thinks is appropriate. In the case of
* errors, loadlib returns nil and two strings describing the error.
* The first string is supplied by the operating system; it should be
* informative and useful for error messages. The second string is "open",
* "init", or "absent" to identify the error and is meant to be used for
* making decisions without having to look into the first string (whose
* format is system-dependent).
*
* This bare-bones loadlib function is supposed to be used as a foundation
* for more sophisticated dynamic library loaders, possibly still called
* loadlib and probably written in Lua, that will be smart enough to try to
* find the library in different directories and also perhaps guess the name
* of the init function.
*
* This module contains an implementation of loadlib for Unix systems that
* have dlfcn, an implementation for Windows, and a stub for other systems.
* See the list at the end of this file for some links to available
* implementations of dlfcn and interfaces to other native dynamic loaders
* on top of which loadlib could be implemented.
*
*/
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#ifndef USE_LOADLIB
#define USE_LOADLIB 1
#endif
#ifndef USE_DLOPEN
#define USE_DLOPEN 0
#endif
#if USE_LOADLIB
#if defined(linux) || defined(sun) || defined(sgi) || defined(BSD) || USE_DLOPEN
#define LOADLIB
/*
* This is an implementation of loadlib based on the dlfcn interface.
* The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
* NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
* as an emulation layer on top of native functions.
*/
#include <dlfcn.h>
static int loadlib(lua_State *L)
{
const char *path=luaL_checkstring(L,1);
const char *init=luaL_checkstring(L,2);
void *lib=dlopen(path,RTLD_NOW);
if (lib!=NULL)
{
lua_CFunction f=(lua_CFunction) dlsym(lib,init);
if (f!=NULL)
{
lua_pushlightuserdata(L,lib);
lua_pushcclosure(L,f,1);
return 1;
}
}
lua_pushnil(L);
lua_pushstring(L,dlerror());
lua_pushstring(L,(lib!=NULL) ? "init" : "open");
if (lib!=NULL) dlclose(lib);
return 3;
}
#elif defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#define LOADLIB
/*
* This is an implementation of loadlib for Windows using native functions.
*/
#include <windows.h>
static void pusherror(lua_State *L)
{
int error=GetLastError();
char buffer[128];
if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
0, error, 0, buffer, sizeof(buffer), 0))
lua_pushstring(L,buffer);
else
lua_pushfstring(L,"system error %d\n",error);
}
static int loadlib(lua_State *L)
{
const char *path=luaL_checkstring(L,1);
const char *init=luaL_checkstring(L,2);
HINSTANCE lib=LoadLibrary(path);
if (lib!=NULL)
{
lua_CFunction f=(lua_CFunction) GetProcAddress(lib,init);
if (f!=NULL)
{
lua_pushlightuserdata(L,lib);
lua_pushcclosure(L,f,1);
return 1;
}
}
lua_pushnil(L);
pusherror(L);
lua_pushstring(L,(lib!=NULL) ? "init" : "open");
if (lib!=NULL) FreeLibrary(lib);
return 3;
}
#else
/*
* write an implementation for your system here and send it to us, together
* with preprocessing symbols that identify your system.
*/
#endif
#endif
#ifndef LOADLIB
/* Fallback for other systems */
static int loadlib(lua_State *L)
{
lua_pushnil(L);
lua_pushliteral(L,"`loadlib' not supported");
lua_pushliteral(L,"absent");
return 3;
}
#endif
LUALIB_API int luaopen_loadlib (lua_State *L)
{
lua_register(L,"loadlib",loadlib);
return 0;
}
/*
* Here are some links por to available implementations of dlfcn and
* interfaces to other native dynamic loaders on top of which loadlib could
* be implemented. Please send contributions and corrections to us.
*
* AIX
* Starting with AIX 4.2, dlfcn is included in the base OS.
* There is also an emulation package available.
* http://www.faqs.org/faqs/aix-faq/part4/section-21.html
*
* HPUX
* HPUX 11 has dlfcn. For HPUX 10 use shl_*.
* http://www.geda.seul.org/mailinglist/geda-dev37/msg00094.html
* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html
*
* Macintosh, Windows
* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html
*
* Mac OS X/Darwin
* http://www.opendarwin.org/projects/dlcompat/
*
* GLIB has wrapper code for BeOS, OS2, Unix and Windows
* http://cvs.gnome.org/lxr/source/glib/gmodule/
*
*/
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