667 lines
19 KiB
C
667 lines
19 KiB
C
/*
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** $Id: loadlib.c 11549 2011-04-01 10:35:32Z miros $
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** Dynamic library loader for Lua
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** See Copyright Notice in lua.h
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**
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** This module contains an implementation of loadlib for Unix systems
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** that have dlfcn, an implementation for Darwin (Mac OS X), an
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** implementation for Windows, and a stub for other systems.
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*/
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#include <stdlib.h>
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#include <string.h>
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#define loadlib_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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/* prefix for open functions in C libraries */
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#define LUA_POF "luaopen_"
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/* separator for open functions in C libraries */
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#define LUA_OFSEP "_"
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#define LIBPREFIX "LOADLIB: "
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#define POF LUA_POF
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#define LIB_FAIL "open"
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/* error codes for ll_loadfunc */
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#define ERRLIB 1
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#define ERRFUNC 2
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#define setprogdir(L) ((void)0)
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static void ll_unloadlib (void *lib);
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static void *ll_load (lua_State *L, const char *path);
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
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#if defined(LUA_DL_DLOPEN)
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/*
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** {========================================================================
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** This is an implementation of loadlib based on the dlfcn interface.
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** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
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** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
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** as an emulation layer on top of native functions.
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** =========================================================================
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*/
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#include <dlfcn.h>
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static void ll_unloadlib (void *lib) {
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dlclose(lib);
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}
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static void *ll_load (lua_State *L, const char *path) {
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void *lib = dlopen(path, RTLD_NOW);
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if (lib == NULL) lua_pushstring(L, dlerror());
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return lib;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
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if (f == NULL) lua_pushstring(L, dlerror());
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return f;
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}
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/* }====================================================== */
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#elif defined(LUA_DL_DLL)
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/*
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** {======================================================================
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** This is an implementation of loadlib for Windows using native functions.
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** =======================================================================
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*/
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#include <windows.h>
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#undef setprogdir
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static void setprogdir (lua_State *L) {
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char buff[MAX_PATH + 1];
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char *lb;
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DWORD nsize = sizeof(buff)/sizeof(char);
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DWORD n = GetModuleFileNameA(NULL, buff, nsize);
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if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
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luaL_error(L, "unable to get ModuleFileName");
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else {
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*lb = '\0';
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luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
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lua_remove(L, -2); /* remove original string */
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}
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}
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static void pusherror (lua_State *L) {
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int error = GetLastError();
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char buffer[128];
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if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, error, 0, buffer, sizeof(buffer), NULL))
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lua_pushstring(L, buffer);
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else
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lua_pushfstring(L, "system error %d\n", error);
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}
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static void ll_unloadlib (void *lib) {
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FreeLibrary((HINSTANCE)lib);
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}
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static void *ll_load (lua_State *L, const char *path) {
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HINSTANCE lib = LoadLibraryA(path);
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if (lib == NULL) pusherror(L);
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return lib;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
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if (f == NULL) pusherror(L);
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return f;
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}
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/* }====================================================== */
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#elif defined(LUA_DL_DYLD)
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/*
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** {======================================================================
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** Native Mac OS X / Darwin Implementation
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** =======================================================================
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*/
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#include <mach-o/dyld.h>
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/* Mac appends a `_' before C function names */
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#undef POF
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#define POF "_" LUA_POF
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static void pusherror (lua_State *L) {
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const char *err_str;
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const char *err_file;
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NSLinkEditErrors err;
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int err_num;
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NSLinkEditError(&err, &err_num, &err_file, &err_str);
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lua_pushstring(L, err_str);
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}
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static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
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switch (ret) {
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case NSObjectFileImageInappropriateFile:
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return "file is not a bundle";
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case NSObjectFileImageArch:
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return "library is for wrong CPU type";
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case NSObjectFileImageFormat:
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return "bad format";
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case NSObjectFileImageAccess:
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return "cannot access file";
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case NSObjectFileImageFailure:
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default:
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return "unable to load library";
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}
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}
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static void ll_unloadlib (void *lib) {
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NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
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}
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static void *ll_load (lua_State *L, const char *path) {
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NSObjectFileImage img;
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NSObjectFileImageReturnCode ret;
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/* this would be a rare case, but prevents crashing if it happens */
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if(!_dyld_present()) {
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lua_pushliteral(L, "dyld not present");
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return NULL;
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}
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ret = NSCreateObjectFileImageFromFile(path, &img);
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if (ret == NSObjectFileImageSuccess) {
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NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
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NSLINKMODULE_OPTION_RETURN_ON_ERROR);
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NSDestroyObjectFileImage(img);
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if (mod == NULL) pusherror(L);
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return mod;
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}
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lua_pushstring(L, errorfromcode(ret));
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return NULL;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
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if (nss == NULL) {
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lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
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return NULL;
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}
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return (lua_CFunction)NSAddressOfSymbol(nss);
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}
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/* }====================================================== */
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#else
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/*
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** {======================================================
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** Fallback for other systems
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** =======================================================
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*/
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#undef LIB_FAIL
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#define LIB_FAIL "absent"
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#define DLMSG "dynamic libraries not enabled; check your Lua installation"
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static void ll_unloadlib (void *lib) {
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(void)lib; /* to avoid warnings */
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}
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static void *ll_load (lua_State *L, const char *path) {
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(void)path; /* to avoid warnings */
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lua_pushliteral(L, DLMSG);
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return NULL;
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}
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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(void)lib; (void)sym; /* to avoid warnings */
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lua_pushliteral(L, DLMSG);
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return NULL;
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}
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/* }====================================================== */
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#endif
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static void **ll_register (lua_State *L, const char *path) {
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void **plib;
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lua_pushfstring(L, "%s%s", LIBPREFIX, path);
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lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */
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if (!lua_isnil(L, -1)) /* is there an entry? */
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plib = (void **)lua_touserdata(L, -1);
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else { /* no entry yet; create one */
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lua_pop(L, 1);
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plib = (void **)lua_newuserdata(L, sizeof(const void *));
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*plib = NULL;
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luaL_getmetatable(L, "_LOADLIB");
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lua_setmetatable(L, -2);
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lua_pushfstring(L, "%s%s", LIBPREFIX, path);
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lua_pushvalue(L, -2);
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lua_settable(L, LUA_REGISTRYINDEX);
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}
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return plib;
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}
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/*
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** __gc tag method: calls library's `ll_unloadlib' function with the lib
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** handle
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*/
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static int gctm (lua_State *L) {
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void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
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if (*lib) ll_unloadlib(*lib);
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*lib = NULL; /* mark library as closed */
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return 0;
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}
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static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
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void **reg = ll_register(L, path);
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if (*reg == NULL) *reg = ll_load(L, path);
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if (*reg == NULL)
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return ERRLIB; /* unable to load library */
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else {
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lua_CFunction f = ll_sym(L, *reg, sym);
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if (f == NULL)
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return ERRFUNC; /* unable to find function */
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lua_pushcfunction(L, f);
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return 0; /* return function */
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}
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}
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static int ll_loadlib (lua_State *L) {
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const char *path = luaL_checkstring(L, 1);
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const char *init = luaL_checkstring(L, 2);
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int stat = ll_loadfunc(L, path, init);
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if (stat == 0) /* no errors? */
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return 1; /* return the loaded function */
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else { /* error; error message is on stack top */
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lua_pushnil(L);
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lua_insert(L, -2);
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lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
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return 3; /* return nil, error message, and where */
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}
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}
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/*
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** {======================================================
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** 'require' function
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** =======================================================
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*/
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static int readable (const char *filename) {
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FILE *f = fopen(filename, "r"); /* try to open file */
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if (f == NULL) return 0; /* open failed */
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fclose(f);
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return 1;
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}
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static const char *pushnexttemplate (lua_State *L, const char *path) {
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const char *l;
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while (*path == *LUA_PATHSEP) path++; /* skip separators */
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if (*path == '\0') return NULL; /* no more templates */
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l = strchr(path, *LUA_PATHSEP); /* find next separator */
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if (l == NULL) l = path + strlen(path);
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lua_pushlstring(L, path, l - path); /* template */
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return l;
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}
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static const char *findfile (lua_State *L, const char *name,
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const char *pname) {
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const char *path;
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name = luaL_gsub(L, name, ".", LUA_DIRSEP);
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lua_getfield(L, LUA_ENVIRONINDEX, pname);
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path = lua_tostring(L, -1);
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if (path == NULL)
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luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
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lua_pushliteral(L, ""); /* error accumulator */
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while ((path = pushnexttemplate(L, path)) != NULL) {
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const char *filename;
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filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
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lua_remove(L, -2); /* remove path template */
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if (readable(filename)) /* does file exist and is readable? */
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return filename; /* return that file name */
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lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
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lua_remove(L, -2); /* remove file name */
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lua_concat(L, 2); /* add entry to possible error message */
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}
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return NULL; /* not found */
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}
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static void loaderror (lua_State *L, const char *filename) {
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luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
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lua_tostring(L, 1), filename, lua_tostring(L, -1));
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}
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static int loader_Lua (lua_State *L) {
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const char *filename;
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const char *name = luaL_checkstring(L, 1);
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filename = findfile(L, name, "path");
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if (filename == NULL) return 1; /* library not found in this path */
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if (luaL_loadfile(L, filename) != 0)
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loaderror(L, filename);
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return 1; /* library loaded successfully */
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}
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static const char *mkfuncname (lua_State *L, const char *modname) {
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const char *funcname;
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const char *mark = strchr(modname, *LUA_IGMARK);
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if (mark) modname = mark + 1;
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funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
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funcname = lua_pushfstring(L, POF"%s", funcname);
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lua_remove(L, -2); /* remove 'gsub' result */
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return funcname;
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}
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static int loader_C (lua_State *L) {
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const char *funcname;
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const char *name = luaL_checkstring(L, 1);
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const char *filename = findfile(L, name, "cpath");
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if (filename == NULL) return 1; /* library not found in this path */
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funcname = mkfuncname(L, name);
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if (ll_loadfunc(L, filename, funcname) != 0)
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loaderror(L, filename);
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return 1; /* library loaded successfully */
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}
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static int loader_Croot (lua_State *L) {
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const char *funcname;
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const char *filename;
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const char *name = luaL_checkstring(L, 1);
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const char *p = strchr(name, '.');
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int stat;
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if (p == NULL) return 0; /* is root */
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lua_pushlstring(L, name, p - name);
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filename = findfile(L, lua_tostring(L, -1), "cpath");
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if (filename == NULL) return 1; /* root not found */
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funcname = mkfuncname(L, name);
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if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
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if (stat != ERRFUNC) loaderror(L, filename); /* real error */
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lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
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name, filename);
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return 1; /* function not found */
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}
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return 1;
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}
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static int loader_preload (lua_State *L) {
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const char *name = luaL_checkstring(L, 1);
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lua_getfield(L, LUA_ENVIRONINDEX, "preload");
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if (!lua_istable(L, -1))
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luaL_error(L, LUA_QL("package.preload") " must be a table");
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lua_getfield(L, -1, name);
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if (lua_isnil(L, -1)) /* not found? */
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lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
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return 1;
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}
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static const int sentinel_ = 0;
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#define sentinel ((void *)&sentinel_)
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static int ll_require (lua_State *L) {
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const char *name = luaL_checkstring(L, 1);
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int i;
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lua_settop(L, 1); /* _LOADED table will be at index 2 */
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lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
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lua_getfield(L, 2, name);
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if (lua_toboolean(L, -1)) { /* is it there? */
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if (lua_touserdata(L, -1) == sentinel) /* check loops */
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luaL_error(L, "loop or previous error loading module " LUA_QS, name);
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return 1; /* package is already loaded */
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}
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/* else must load it; iterate over available loaders */
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lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
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if (!lua_istable(L, -1))
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luaL_error(L, LUA_QL("package.loaders") " must be a table");
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lua_pushliteral(L, ""); /* error message accumulator */
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for (i=1; ; i++) {
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lua_rawgeti(L, -2, i); /* get a loader */
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if (lua_isnil(L, -1))
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luaL_error(L, "module " LUA_QS " not found:%s",
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name, lua_tostring(L, -2));
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lua_pushstring(L, name);
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lua_call(L, 1, 1); /* call it */
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if (lua_isfunction(L, -1)) /* did it find module? */
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break; /* module loaded successfully */
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else if (lua_isstring(L, -1)) /* loader returned error message? */
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lua_concat(L, 2); /* accumulate it */
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else
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lua_pop(L, 1);
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}
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lua_pushlightuserdata(L, sentinel);
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lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
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lua_pushstring(L, name); /* pass name as argument to module */
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lua_call(L, 1, 1); /* run loaded module */
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if (!lua_isnil(L, -1)) /* non-nil return? */
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lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
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lua_getfield(L, 2, name);
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if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
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lua_pushboolean(L, 1); /* use true as result */
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lua_pushvalue(L, -1); /* extra copy to be returned */
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lua_setfield(L, 2, name); /* _LOADED[name] = true */
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}
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return 1;
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}
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/* }====================================================== */
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/*
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** {======================================================
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** 'module' function
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** =======================================================
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*/
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static void setfenv (lua_State *L) {
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lua_Debug ar;
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if (lua_getstack(L, 1, &ar) == 0 ||
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lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
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lua_iscfunction(L, -1))
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luaL_error(L, LUA_QL("module") " not called from a Lua function");
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lua_pushvalue(L, -2);
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lua_setfenv(L, -2);
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lua_pop(L, 1);
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}
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static void dooptions (lua_State *L, int n) {
|
|
int i;
|
|
for (i = 2; i <= n; i++) {
|
|
lua_pushvalue(L, i); /* get option (a function) */
|
|
lua_pushvalue(L, -2); /* module */
|
|
lua_call(L, 1, 0);
|
|
}
|
|
}
|
|
|
|
|
|
static void modinit (lua_State *L, const char *modname) {
|
|
const char *dot;
|
|
lua_pushvalue(L, -1);
|
|
lua_setfield(L, -2, "_M"); /* module._M = module */
|
|
lua_pushstring(L, modname);
|
|
lua_setfield(L, -2, "_NAME");
|
|
dot = strrchr(modname, '.'); /* look for last dot in module name */
|
|
if (dot == NULL) dot = modname;
|
|
else dot++;
|
|
/* set _PACKAGE as package name (full module name minus last part) */
|
|
lua_pushlstring(L, modname, dot - modname);
|
|
lua_setfield(L, -2, "_PACKAGE");
|
|
}
|
|
|
|
|
|
static int ll_module (lua_State *L) {
|
|
const char *modname = luaL_checkstring(L, 1);
|
|
int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
|
|
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
|
|
lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
|
|
if (!lua_istable(L, -1)) { /* not found? */
|
|
lua_pop(L, 1); /* remove previous result */
|
|
/* try global variable (and create one if it does not exist) */
|
|
if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
|
|
return luaL_error(L, "name conflict for module " LUA_QS, modname);
|
|
lua_pushvalue(L, -1);
|
|
lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
|
|
}
|
|
/* check whether table already has a _NAME field */
|
|
lua_getfield(L, -1, "_NAME");
|
|
if (!lua_isnil(L, -1)) /* is table an initialized module? */
|
|
lua_pop(L, 1);
|
|
else { /* no; initialize it */
|
|
lua_pop(L, 1);
|
|
modinit(L, modname);
|
|
}
|
|
lua_pushvalue(L, -1);
|
|
setfenv(L);
|
|
dooptions(L, loaded - 1);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ll_seeall (lua_State *L) {
|
|
luaL_checktype(L, 1, LUA_TTABLE);
|
|
if (!lua_getmetatable(L, 1)) {
|
|
lua_createtable(L, 0, 1); /* create new metatable */
|
|
lua_pushvalue(L, -1);
|
|
lua_setmetatable(L, 1);
|
|
}
|
|
lua_pushvalue(L, LUA_GLOBALSINDEX);
|
|
lua_setfield(L, -2, "__index"); /* mt.__index = _G */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
/* auxiliary mark (for internal use) */
|
|
#define AUXMARK "\1"
|
|
|
|
static void setpath (lua_State *L, const char *fieldname, const char *envname,
|
|
const char *def) {
|
|
const char *path = getenv(envname);
|
|
if (path == NULL) /* no environment variable? */
|
|
lua_pushstring(L, def); /* use default */
|
|
else {
|
|
/* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
|
|
path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
|
|
LUA_PATHSEP AUXMARK LUA_PATHSEP);
|
|
luaL_gsub(L, path, AUXMARK, def);
|
|
lua_remove(L, -2);
|
|
}
|
|
setprogdir(L);
|
|
lua_setfield(L, -2, fieldname);
|
|
}
|
|
|
|
|
|
static const luaL_Reg pk_funcs[] = {
|
|
{"loadlib", ll_loadlib},
|
|
{"seeall", ll_seeall},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const luaL_Reg ll_funcs[] = {
|
|
{"module", ll_module},
|
|
{"require", ll_require},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const lua_CFunction loaders[] =
|
|
{loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
|
|
|
|
|
|
LUALIB_API int luaopen_package (lua_State *L) {
|
|
int i;
|
|
/* create new type _LOADLIB */
|
|
luaL_newmetatable(L, "_LOADLIB");
|
|
lua_pushcfunction(L, gctm);
|
|
lua_setfield(L, -2, "__gc");
|
|
/* create `package' table */
|
|
luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
|
|
#if defined(LUA_COMPAT_LOADLIB)
|
|
lua_getfield(L, -1, "loadlib");
|
|
lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
|
|
#endif
|
|
lua_pushvalue(L, -1);
|
|
lua_replace(L, LUA_ENVIRONINDEX);
|
|
/* create `loaders' table */
|
|
lua_createtable(L, sizeof(loaders)/sizeof(loaders[0]) - 1, 0);
|
|
/* fill it with pre-defined loaders */
|
|
for (i=0; loaders[i] != NULL; i++) {
|
|
lua_pushcfunction(L, loaders[i]);
|
|
lua_rawseti(L, -2, i+1);
|
|
}
|
|
lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */
|
|
setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */
|
|
setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
|
|
/* store config information */
|
|
lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
|
|
LUA_EXECDIR "\n" LUA_IGMARK);
|
|
lua_setfield(L, -2, "config");
|
|
/* set field `loaded' */
|
|
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
|
|
lua_setfield(L, -2, "loaded");
|
|
/* set field `preload' */
|
|
lua_newtable(L);
|
|
lua_setfield(L, -2, "preload");
|
|
lua_pushvalue(L, LUA_GLOBALSINDEX);
|
|
luaL_register(L, NULL, ll_funcs); /* open lib into global table */
|
|
lua_pop(L, 1);
|
|
return 1; /* return 'package' table */
|
|
}
|
|
|