rlm@1: /*
rlm@1: ** $Id: loadlib.c,v 1.52.1.3 2008/08/06 13:29:28 roberto Exp $
rlm@1: ** Dynamic library loader for Lua
rlm@1: ** See Copyright Notice in lua.h
rlm@1: **
rlm@1: ** This module contains an implementation of loadlib for Unix systems
rlm@1: ** that have dlfcn, an implementation for Darwin (Mac OS X), an
rlm@1: ** implementation for Windows, and a stub for other systems.
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #include <stdlib.h>
rlm@1: #include <string.h>
rlm@1: 
rlm@1: 
rlm@1: #define loadlib_c
rlm@1: #define LUA_LIB
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "lauxlib.h"
rlm@1: #include "lualib.h"
rlm@1: 
rlm@1: 
rlm@1: /* prefix for open functions in C libraries */
rlm@1: #define LUA_POF		"luaopen_"
rlm@1: 
rlm@1: /* separator for open functions in C libraries */
rlm@1: #define LUA_OFSEP	"_"
rlm@1: 
rlm@1: 
rlm@1: #define LIBPREFIX	"LOADLIB: "
rlm@1: 
rlm@1: #define POF		LUA_POF
rlm@1: #define LIB_FAIL	"open"
rlm@1: 
rlm@1: 
rlm@1: /* error codes for ll_loadfunc */
rlm@1: #define ERRLIB		1
rlm@1: #define ERRFUNC		2
rlm@1: 
rlm@1: #define setprogdir(L)		((void)0)
rlm@1: 
rlm@1: 
rlm@1: static void ll_unloadlib (void *lib);
rlm@1: static void *ll_load (lua_State *L, const char *path);
rlm@1: static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: #if defined(LUA_DL_DLOPEN)
rlm@1: /*
rlm@1: ** {========================================================================
rlm@1: ** This is an implementation of loadlib based on the dlfcn interface.
rlm@1: ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
rlm@1: ** NetBSD, AIX 4.2, HPUX 11, and  probably most other Unix flavors, at least
rlm@1: ** as an emulation layer on top of native functions.
rlm@1: ** =========================================================================
rlm@1: */
rlm@1: 
rlm@1: #include <dlfcn.h>
rlm@1: 
rlm@1: static void ll_unloadlib (void *lib) {
rlm@1:   dlclose(lib);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void *ll_load (lua_State *L, const char *path) {
rlm@1:   void *lib = dlopen(path, RTLD_NOW);
rlm@1:   if (lib == NULL) lua_pushstring(L, dlerror());
rlm@1:   return lib;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
rlm@1:   lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
rlm@1:   if (f == NULL) lua_pushstring(L, dlerror());
rlm@1:   return f;
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: #elif defined(LUA_DL_DLL)
rlm@1: /*
rlm@1: ** {======================================================================
rlm@1: ** This is an implementation of loadlib for Windows using native functions.
rlm@1: ** =======================================================================
rlm@1: */
rlm@1: 
rlm@1: #include <windows.h>
rlm@1: 
rlm@1: 
rlm@1: #undef setprogdir
rlm@1: 
rlm@1: static void setprogdir (lua_State *L) {
rlm@1:   char buff[MAX_PATH + 1];
rlm@1:   char *lb;
rlm@1:   DWORD nsize = sizeof(buff)/sizeof(char);
rlm@1:   DWORD n = GetModuleFileNameA(NULL, buff, nsize);
rlm@1:   if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
rlm@1:     luaL_error(L, "unable to get ModuleFileName");
rlm@1:   else {
rlm@1:     *lb = '\0';
rlm@1:     luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
rlm@1:     lua_remove(L, -2);  /* remove original string */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void pusherror (lua_State *L) {
rlm@1:   int error = GetLastError();
rlm@1:   char buffer[128];
rlm@1:   if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
rlm@1:       NULL, error, 0, buffer, sizeof(buffer), NULL))
rlm@1:     lua_pushstring(L, buffer);
rlm@1:   else
rlm@1:     lua_pushfstring(L, "system error %d\n", error);
rlm@1: }
rlm@1: 
rlm@1: static void ll_unloadlib (void *lib) {
rlm@1:   FreeLibrary((HINSTANCE)lib);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void *ll_load (lua_State *L, const char *path) {
rlm@1:   HINSTANCE lib = LoadLibraryA(path);
rlm@1:   if (lib == NULL) pusherror(L);
rlm@1:   return lib;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
rlm@1:   lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
rlm@1:   if (f == NULL) pusherror(L);
rlm@1:   return f;
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: #elif defined(LUA_DL_DYLD)
rlm@1: /*
rlm@1: ** {======================================================================
rlm@1: ** Native Mac OS X / Darwin Implementation
rlm@1: ** =======================================================================
rlm@1: */
rlm@1: 
rlm@1: #include <mach-o/dyld.h>
rlm@1: 
rlm@1: 
rlm@1: /* Mac appends a `_' before C function names */
rlm@1: #undef POF
rlm@1: #define POF	"_" LUA_POF
rlm@1: 
rlm@1: 
rlm@1: static void pusherror (lua_State *L) {
rlm@1:   const char *err_str;
rlm@1:   const char *err_file;
rlm@1:   NSLinkEditErrors err;
rlm@1:   int err_num;
rlm@1:   NSLinkEditError(&err, &err_num, &err_file, &err_str);
rlm@1:   lua_pushstring(L, err_str);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
rlm@1:   switch (ret) {
rlm@1:     case NSObjectFileImageInappropriateFile:
rlm@1:       return "file is not a bundle";
rlm@1:     case NSObjectFileImageArch:
rlm@1:       return "library is for wrong CPU type";
rlm@1:     case NSObjectFileImageFormat:
rlm@1:       return "bad format";
rlm@1:     case NSObjectFileImageAccess:
rlm@1:       return "cannot access file";
rlm@1:     case NSObjectFileImageFailure:
rlm@1:     default:
rlm@1:       return "unable to load library";
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void ll_unloadlib (void *lib) {
rlm@1:   NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void *ll_load (lua_State *L, const char *path) {
rlm@1:   NSObjectFileImage img;
rlm@1:   NSObjectFileImageReturnCode ret;
rlm@1:   /* this would be a rare case, but prevents crashing if it happens */
rlm@1:   if(!_dyld_present()) {
rlm@1:     lua_pushliteral(L, "dyld not present");
rlm@1:     return NULL;
rlm@1:   }
rlm@1:   ret = NSCreateObjectFileImageFromFile(path, &img);
rlm@1:   if (ret == NSObjectFileImageSuccess) {
rlm@1:     NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
rlm@1:                        NSLINKMODULE_OPTION_RETURN_ON_ERROR);
rlm@1:     NSDestroyObjectFileImage(img);
rlm@1:     if (mod == NULL) pusherror(L);
rlm@1:     return mod;
rlm@1:   }
rlm@1:   lua_pushstring(L, errorfromcode(ret));
rlm@1:   return NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
rlm@1:   NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
rlm@1:   if (nss == NULL) {
rlm@1:     lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
rlm@1:     return NULL;
rlm@1:   }
rlm@1:   return (lua_CFunction)NSAddressOfSymbol(nss);
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: #else
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** Fallback for other systems
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: #undef LIB_FAIL
rlm@1: #define LIB_FAIL	"absent"
rlm@1: 
rlm@1: 
rlm@1: #define DLMSG	"dynamic libraries not enabled; check your Lua installation"
rlm@1: 
rlm@1: 
rlm@1: static void ll_unloadlib (void *lib) {
rlm@1:   (void)lib;  /* to avoid warnings */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void *ll_load (lua_State *L, const char *path) {
rlm@1:   (void)path;  /* to avoid warnings */
rlm@1:   lua_pushliteral(L, DLMSG);
rlm@1:   return NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
rlm@1:   (void)lib; (void)sym;  /* to avoid warnings */
rlm@1:   lua_pushliteral(L, DLMSG);
rlm@1:   return NULL;
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: #endif
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: static void **ll_register (lua_State *L, const char *path) {
rlm@1:   void **plib;
rlm@1:   lua_pushfstring(L, "%s%s", LIBPREFIX, path);
rlm@1:   lua_gettable(L, LUA_REGISTRYINDEX);  /* check library in registry? */
rlm@1:   if (!lua_isnil(L, -1))  /* is there an entry? */
rlm@1:     plib = (void **)lua_touserdata(L, -1);
rlm@1:   else {  /* no entry yet; create one */
rlm@1:     lua_pop(L, 1);
rlm@1:     plib = (void **)lua_newuserdata(L, sizeof(const void *));
rlm@1:     *plib = NULL;
rlm@1:     luaL_getmetatable(L, "_LOADLIB");
rlm@1:     lua_setmetatable(L, -2);
rlm@1:     lua_pushfstring(L, "%s%s", LIBPREFIX, path);
rlm@1:     lua_pushvalue(L, -2);
rlm@1:     lua_settable(L, LUA_REGISTRYINDEX);
rlm@1:   }
rlm@1:   return plib;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** __gc tag method: calls library's `ll_unloadlib' function with the lib
rlm@1: ** handle
rlm@1: */
rlm@1: static int gctm (lua_State *L) {
rlm@1:   void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
rlm@1:   if (*lib) ll_unloadlib(*lib);
rlm@1:   *lib = NULL;  /* mark library as closed */
rlm@1:   return 0;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
rlm@1:   void **reg = ll_register(L, path);
rlm@1:   if (*reg == NULL) *reg = ll_load(L, path);
rlm@1:   if (*reg == NULL)
rlm@1:     return ERRLIB;  /* unable to load library */
rlm@1:   else {
rlm@1:     lua_CFunction f = ll_sym(L, *reg, sym);
rlm@1:     if (f == NULL)
rlm@1:       return ERRFUNC;  /* unable to find function */
rlm@1:     lua_pushcfunction(L, f);
rlm@1:     return 0;  /* return function */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int ll_loadlib (lua_State *L) {
rlm@1:   const char *path = luaL_checkstring(L, 1);
rlm@1:   const char *init = luaL_checkstring(L, 2);
rlm@1:   int stat = ll_loadfunc(L, path, init);
rlm@1:   if (stat == 0)  /* no errors? */
rlm@1:     return 1;  /* return the loaded function */
rlm@1:   else {  /* error; error message is on stack top */
rlm@1:     lua_pushnil(L);
rlm@1:     lua_insert(L, -2);
rlm@1:     lua_pushstring(L, (stat == ERRLIB) ?  LIB_FAIL : "init");
rlm@1:     return 3;  /* return nil, error message, and where */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** 'require' function
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: static int readable (const char *filename) {
rlm@1:   FILE *f = fopen(filename, "r");  /* try to open file */
rlm@1:   if (f == NULL) return 0;  /* open failed */
rlm@1:   fclose(f);
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const char *pushnexttemplate (lua_State *L, const char *path) {
rlm@1:   const char *l;
rlm@1:   while (*path == *LUA_PATHSEP) path++;  /* skip separators */
rlm@1:   if (*path == '\0') return NULL;  /* no more templates */
rlm@1:   l = strchr(path, *LUA_PATHSEP);  /* find next separator */
rlm@1:   if (l == NULL) l = path + strlen(path);
rlm@1:   lua_pushlstring(L, path, l - path);  /* template */
rlm@1:   return l;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const char *findfile (lua_State *L, const char *name,
rlm@1:                                            const char *pname) {
rlm@1:   const char *path;
rlm@1:   name = luaL_gsub(L, name, ".", LUA_DIRSEP);
rlm@1:   lua_getfield(L, LUA_ENVIRONINDEX, pname);
rlm@1:   path = lua_tostring(L, -1);
rlm@1:   if (path == NULL)
rlm@1:     luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
rlm@1:   lua_pushliteral(L, "");  /* error accumulator */
rlm@1:   while ((path = pushnexttemplate(L, path)) != NULL) {
rlm@1:     const char *filename;
rlm@1:     filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
rlm@1:     lua_remove(L, -2);  /* remove path template */
rlm@1:     if (readable(filename))  /* does file exist and is readable? */
rlm@1:       return filename;  /* return that file name */
rlm@1:     lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
rlm@1:     lua_remove(L, -2);  /* remove file name */
rlm@1:     lua_concat(L, 2);  /* add entry to possible error message */
rlm@1:   }
rlm@1:   return NULL;  /* not found */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void loaderror (lua_State *L, const char *filename) {
rlm@1:   luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
rlm@1:                 lua_tostring(L, 1), filename, lua_tostring(L, -1));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int loader_Lua (lua_State *L) {
rlm@1:   const char *filename;
rlm@1:   const char *name = luaL_checkstring(L, 1);
rlm@1:   filename = findfile(L, name, "path");
rlm@1:   if (filename == NULL) return 1;  /* library not found in this path */
rlm@1:   if (luaL_loadfile(L, filename) != 0)
rlm@1:     loaderror(L, filename);
rlm@1:   return 1;  /* library loaded successfully */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const char *mkfuncname (lua_State *L, const char *modname) {
rlm@1:   const char *funcname;
rlm@1:   const char *mark = strchr(modname, *LUA_IGMARK);
rlm@1:   if (mark) modname = mark + 1;
rlm@1:   funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
rlm@1:   funcname = lua_pushfstring(L, POF"%s", funcname);
rlm@1:   lua_remove(L, -2);  /* remove 'gsub' result */
rlm@1:   return funcname;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int loader_C (lua_State *L) {
rlm@1:   const char *funcname;
rlm@1:   const char *name = luaL_checkstring(L, 1);
rlm@1:   const char *filename = findfile(L, name, "cpath");
rlm@1:   if (filename == NULL) return 1;  /* library not found in this path */
rlm@1:   funcname = mkfuncname(L, name);
rlm@1:   if (ll_loadfunc(L, filename, funcname) != 0)
rlm@1:     loaderror(L, filename);
rlm@1:   return 1;  /* library loaded successfully */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int loader_Croot (lua_State *L) {
rlm@1:   const char *funcname;
rlm@1:   const char *filename;
rlm@1:   const char *name = luaL_checkstring(L, 1);
rlm@1:   const char *p = strchr(name, '.');
rlm@1:   int stat;
rlm@1:   if (p == NULL) return 0;  /* is root */
rlm@1:   lua_pushlstring(L, name, p - name);
rlm@1:   filename = findfile(L, lua_tostring(L, -1), "cpath");
rlm@1:   if (filename == NULL) return 1;  /* root not found */
rlm@1:   funcname = mkfuncname(L, name);
rlm@1:   if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
rlm@1:     if (stat != ERRFUNC) loaderror(L, filename);  /* real error */
rlm@33:         lua_pushfstring(L, "\n\tno module " LUA_QS " in derp " LUA_QS,
rlm@1:                        name, filename);
rlm@1:     return 1;  /* function not found */
rlm@1:   }
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int loader_preload (lua_State *L) {
rlm@1:   const char *name = luaL_checkstring(L, 1);
rlm@1:   lua_getfield(L, LUA_ENVIRONINDEX, "preload");
rlm@1:   if (!lua_istable(L, -1))
rlm@1:     luaL_error(L, LUA_QL("package.preload") " must be a table");
rlm@1:   lua_getfield(L, -1, name);
rlm@1:   if (lua_isnil(L, -1))  /* not found? */
rlm@1:     lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const int sentinel_ = 0;
rlm@1: #define sentinel	((void *)&sentinel_)
rlm@1: 
rlm@1: 
rlm@1: static int ll_require (lua_State *L) {
rlm@1:   const char *name = luaL_checkstring(L, 1);
rlm@1:   int i;
rlm@1:   lua_settop(L, 1);  /* _LOADED table will be at index 2 */
rlm@1:   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
rlm@1:   lua_getfield(L, 2, name);
rlm@1:   if (lua_toboolean(L, -1)) {  /* is it there? */
rlm@1:     if (lua_touserdata(L, -1) == sentinel)  /* check loops */
rlm@1:       luaL_error(L, "loop or previous error loading module " LUA_QS, name);
rlm@1:     return 1;  /* package is already loaded */
rlm@1:   }
rlm@1:   /* else must load it; iterate over available loaders */
rlm@1:   lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
rlm@1:   if (!lua_istable(L, -1))
rlm@1:     luaL_error(L, LUA_QL("package.loaders") " must be a table");
rlm@1:   lua_pushliteral(L, "");  /* error message accumulator */
rlm@1:   for (i=1; ; i++) {
rlm@1:     lua_rawgeti(L, -2, i);  /* get a loader */
rlm@1:     if (lua_isnil(L, -1))
rlm@1:       luaL_error(L, "module " LUA_QS " not found:%s",
rlm@1:                     name, lua_tostring(L, -2));
rlm@1:     lua_pushstring(L, name);
rlm@1:     lua_call(L, 1, 1);  /* call it */
rlm@1:     if (lua_isfunction(L, -1))  /* did it find module? */
rlm@1:       break;  /* module loaded successfully */
rlm@1:     else if (lua_isstring(L, -1))  /* loader returned error message? */
rlm@1:       lua_concat(L, 2);  /* accumulate it */
rlm@1:     else
rlm@1:       lua_pop(L, 1);
rlm@1:   }
rlm@1:   lua_pushlightuserdata(L, sentinel);
rlm@1:   lua_setfield(L, 2, name);  /* _LOADED[name] = sentinel */
rlm@1:   lua_pushstring(L, name);  /* pass name as argument to module */
rlm@1:   lua_call(L, 1, 1);  /* run loaded module */
rlm@1:   if (!lua_isnil(L, -1))  /* non-nil return? */
rlm@1:     lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
rlm@1:   lua_getfield(L, 2, name);
rlm@1:   if (lua_touserdata(L, -1) == sentinel) {   /* module did not set a value? */
rlm@1:     lua_pushboolean(L, 1);  /* use true as result */
rlm@1:     lua_pushvalue(L, -1);  /* extra copy to be returned */
rlm@1:     lua_setfield(L, 2, name);  /* _LOADED[name] = true */
rlm@1:   }
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** 'module' function
rlm@1: ** =======================================================
rlm@1: */
rlm@1:   
rlm@1: 
rlm@1: static void setfenv (lua_State *L) {
rlm@1:   lua_Debug ar;
rlm@1:   if (lua_getstack(L, 1, &ar) == 0 ||
rlm@1:       lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */
rlm@1:       lua_iscfunction(L, -1))
rlm@1:     luaL_error(L, LUA_QL("module") " not called from a Lua function");
rlm@1:   lua_pushvalue(L, -2);
rlm@1:   lua_setfenv(L, -2);
rlm@1:   lua_pop(L, 1);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void dooptions (lua_State *L, int n) {
rlm@1:   int i;
rlm@1:   for (i = 2; i <= n; i++) {
rlm@1:     lua_pushvalue(L, i);  /* get option (a function) */
rlm@1:     lua_pushvalue(L, -2);  /* module */
rlm@1:     lua_call(L, 1, 0);
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void modinit (lua_State *L, const char *modname) {
rlm@1:   const char *dot;
rlm@1:   lua_pushvalue(L, -1);
rlm@1:   lua_setfield(L, -2, "_M");  /* module._M = module */
rlm@1:   lua_pushstring(L, modname);
rlm@1:   lua_setfield(L, -2, "_NAME");
rlm@1:   dot = strrchr(modname, '.');  /* look for last dot in module name */
rlm@1:   if (dot == NULL) dot = modname;
rlm@1:   else dot++;
rlm@1:   /* set _PACKAGE as package name (full module name minus last part) */
rlm@1:   lua_pushlstring(L, modname, dot - modname);
rlm@1:   lua_setfield(L, -2, "_PACKAGE");
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int ll_module (lua_State *L) {
rlm@1:   const char *modname = luaL_checkstring(L, 1);
rlm@1:   int loaded = lua_gettop(L) + 1;  /* index of _LOADED table */
rlm@1:   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
rlm@1:   lua_getfield(L, loaded, modname);  /* get _LOADED[modname] */
rlm@1:   if (!lua_istable(L, -1)) {  /* not found? */
rlm@1:     lua_pop(L, 1);  /* remove previous result */
rlm@1:     /* try global variable (and create one if it does not exist) */
rlm@1:     if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
rlm@1:       return luaL_error(L, "name conflict for module " LUA_QS, modname);
rlm@1:     lua_pushvalue(L, -1);
rlm@1:     lua_setfield(L, loaded, modname);  /* _LOADED[modname] = new table */
rlm@1:   }
rlm@1:   /* check whether table already has a _NAME field */
rlm@1:   lua_getfield(L, -1, "_NAME");
rlm@1:   if (!lua_isnil(L, -1))  /* is table an initialized module? */
rlm@1:     lua_pop(L, 1);
rlm@1:   else {  /* no; initialize it */
rlm@1:     lua_pop(L, 1);
rlm@1:     modinit(L, modname);
rlm@1:   }
rlm@1:   lua_pushvalue(L, -1);
rlm@1:   setfenv(L);
rlm@1:   dooptions(L, loaded - 1);
rlm@1:   return 0;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int ll_seeall (lua_State *L) {
rlm@1:   luaL_checktype(L, 1, LUA_TTABLE);
rlm@1:   if (!lua_getmetatable(L, 1)) {
rlm@1:     lua_createtable(L, 0, 1); /* create new metatable */
rlm@1:     lua_pushvalue(L, -1);
rlm@1:     lua_setmetatable(L, 1);
rlm@1:   }
rlm@1:   lua_pushvalue(L, LUA_GLOBALSINDEX);
rlm@1:   lua_setfield(L, -2, "__index");  /* mt.__index = _G */
rlm@1:   return 0;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /* auxiliary mark (for internal use) */
rlm@1: #define AUXMARK		"\1"
rlm@1: 
rlm@1: static void setpath (lua_State *L, const char *fieldname, const char *envname,
rlm@1:                                    const char *def) {
rlm@1:   const char *path = getenv(envname);
rlm@1:   if (path == NULL)  /* no environment variable? */
rlm@1:     lua_pushstring(L, def);  /* use default */
rlm@1:   else {
rlm@1:     /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
rlm@1:     path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
rlm@1:                               LUA_PATHSEP AUXMARK LUA_PATHSEP);
rlm@1:     luaL_gsub(L, path, AUXMARK, def);
rlm@1:     lua_remove(L, -2);
rlm@1:   }
rlm@1:   setprogdir(L);
rlm@1:   lua_setfield(L, -2, fieldname);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const luaL_Reg pk_funcs[] = {
rlm@1:   {"loadlib", ll_loadlib},
rlm@1:   {"seeall", ll_seeall},
rlm@1:   {NULL, NULL}
rlm@1: };
rlm@1: 
rlm@1: 
rlm@1: static const luaL_Reg ll_funcs[] = {
rlm@1:   {"module", ll_module},
rlm@1:   {"require", ll_require},
rlm@1:   {NULL, NULL}
rlm@1: };
rlm@1: 
rlm@1: 
rlm@1: static const lua_CFunction loaders[] =
rlm@1:   {loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaopen_package (lua_State *L) {
rlm@1:   int i;
rlm@1:   /* create new type _LOADLIB */
rlm@1:   luaL_newmetatable(L, "_LOADLIB");
rlm@1:   lua_pushcfunction(L, gctm);
rlm@1:   lua_setfield(L, -2, "__gc");
rlm@1:   /* create `package' table */
rlm@1:   luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
rlm@1: #if defined(LUA_COMPAT_LOADLIB) 
rlm@1:   lua_getfield(L, -1, "loadlib");
rlm@1:   lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
rlm@1: #endif
rlm@1:   lua_pushvalue(L, -1);
rlm@1:   lua_replace(L, LUA_ENVIRONINDEX);
rlm@1:   /* create `loaders' table */
rlm@1:   lua_createtable(L, 0, sizeof(loaders)/sizeof(loaders[0]) - 1);
rlm@1:   /* fill it with pre-defined loaders */
rlm@1:   for (i=0; loaders[i] != NULL; i++) {
rlm@1:     lua_pushcfunction(L, loaders[i]);
rlm@1:     lua_rawseti(L, -2, i+1);
rlm@1:   }
rlm@1:   lua_setfield(L, -2, "loaders");  /* put it in field `loaders' */
rlm@1:   setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT);  /* set field `path' */
rlm@1:   setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
rlm@1:   /* store config information */
rlm@1:   lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
rlm@1:                      LUA_EXECDIR "\n" LUA_IGMARK);
rlm@1:   lua_setfield(L, -2, "config");
rlm@1:   /* set field `loaded' */
rlm@1:   luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
rlm@1:   lua_setfield(L, -2, "loaded");
rlm@1:   /* set field `preload' */
rlm@1:   lua_newtable(L);
rlm@1:   lua_setfield(L, -2, "preload");
rlm@1:   lua_pushvalue(L, LUA_GLOBALSINDEX);
rlm@1:   luaL_register(L, NULL, ll_funcs);  /* open lib into global table */
rlm@1:   lua_pop(L, 1);
rlm@1:   return 1;  /* return 'package' table */
rlm@1: }
rlm@1: