mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-26 16:37:30 +03:00
715 lines
20 KiB
C
715 lines
20 KiB
C
/*
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** $Id: loadlib.c,v 1.108 2011/12/12 16:34:03 roberto Exp $
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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 Windows, and a stub for other
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** systems.
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*/
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/*
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** if needed, includes windows header before everything else
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*/
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#if defined(_WIN32)
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#include <windows.h>
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#endif
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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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/*
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** LUA_PATH and LUA_CPATH are the names of the environment
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** variables that Lua check to set its paths.
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*/
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#if !defined(LUA_PATH)
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#define LUA_PATH "LUA_PATH"
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#endif
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#if !defined(LUA_CPATH)
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#define LUA_CPATH "LUA_CPATH"
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#endif
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#define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
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#define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX
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#define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX
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/*
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** LUA_PATH_SEP is the character that separates templates in a path.
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** LUA_PATH_MARK is the string that marks the substitution points in a
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** template.
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** LUA_EXEC_DIR in a Windows path is replaced by the executable's
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** directory.
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** LUA_IGMARK is a mark to ignore all before it when building the
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** luaopen_ function name.
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*/
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#if !defined (LUA_PATH_SEP)
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#define LUA_PATH_SEP ";"
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#endif
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#if !defined (LUA_PATH_MARK)
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#define LUA_PATH_MARK "?"
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#endif
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#if !defined (LUA_EXEC_DIR)
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#define LUA_EXEC_DIR "!"
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#endif
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#if !defined (LUA_IGMARK)
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#define LUA_IGMARK "-"
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#endif
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/*
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** LUA_CSUBSEP is the character that replaces dots in submodule names
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** when searching for a C loader.
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** LUA_LSUBSEP is the character that replaces dots in submodule names
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** when searching for a Lua loader.
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*/
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#if !defined(LUA_CSUBSEP)
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#define LUA_CSUBSEP LUA_DIRSEP
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#endif
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#if !defined(LUA_LSUBSEP)
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#define LUA_LSUBSEP LUA_DIRSEP
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#endif
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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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/*
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** system-dependent functions
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*/
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static void ll_unloadlib (void *lib);
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static void *ll_load (lua_State *L, const char *path, int seeglb);
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static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
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#if defined(LUA_USE_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, int seeglb) {
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void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
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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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#undef setprogdir
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/*
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** optional flags for LoadLibraryEx
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*/
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#if !defined(LUA_LLE_FLAGS)
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#define LUA_LLE_FLAGS 0
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#endif
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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_EXEC_DIR, 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)/sizeof(char), 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((HMODULE)lib);
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}
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static void *ll_load (lua_State *L, const char *path, int seeglb) {
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HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);
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(void)(seeglb); /* not used: symbols are 'global' by default */
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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((HMODULE)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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#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); /* not used */
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}
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static void *ll_load (lua_State *L, const char *path, int seeglb) {
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(void)(path); (void)(seeglb); /* not used */
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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); /* not used */
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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); /* remove result from gettable */
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plib = (void **)lua_newuserdata(L, sizeof(const void *));
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*plib = NULL;
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luaL_setmetatable(L, "_LOADLIB");
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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, *sym == '*');
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if (*reg == NULL) return ERRLIB; /* unable to load library */
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if (*sym == '*') { /* loading only library (no function)? */
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lua_pushboolean(L, 1); /* return 'true' */
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return 0; /* no errors */
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}
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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); /* else create new function */
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return 0; /* no errors */
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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_PATH_SEP) path++; /* skip separators */
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if (*path == '\0') return NULL; /* no more templates */
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l = strchr(path, *LUA_PATH_SEP); /* 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 *searchpath (lua_State *L, const char *name,
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const char *path,
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const char *sep,
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const char *dirsep) {
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luaL_Buffer msg; /* to build error message */
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luaL_buffinit(L, &msg);
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if (*sep != '\0') /* non-empty separator? */
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name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */
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while ((path = pushnexttemplate(L, path)) != NULL) {
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const char *filename = luaL_gsub(L, lua_tostring(L, -1),
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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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luaL_addvalue(&msg); /* concatenate error msg. entry */
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}
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luaL_pushresult(&msg); /* create error message */
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return NULL; /* not found */
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}
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static int ll_searchpath (lua_State *L) {
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const char *f = searchpath(L, luaL_checkstring(L, 1),
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luaL_checkstring(L, 2),
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luaL_optstring(L, 3, "."),
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luaL_optstring(L, 4, LUA_DIRSEP));
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if (f != NULL) return 1;
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else { /* error message is on top of the stack */
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lua_pushnil(L);
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lua_insert(L, -2);
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return 2; /* return nil + error message */
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}
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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 *dirsep) {
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const char *path;
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lua_getfield(L, lua_upvalueindex(1), 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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return searchpath(L, name, path, ".", dirsep);
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}
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static int checkload (lua_State *L, int stat, const char *filename) {
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if (stat) { /* module loaded successfully? */
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lua_pushstring(L, filename); /* will be 2nd argument to module */
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return 2; /* return open function and file name */
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}
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else
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return luaL_error(L, "error loading module " LUA_QS
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" 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 searcher_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", LUA_LSUBSEP);
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if (filename == NULL) return 1; /* module not found in this path */
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return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);
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}
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static int loadfunc (lua_State *L, const char *filename, const char *modname) {
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const char *funcname;
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const char *mark;
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modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
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mark = strchr(modname, *LUA_IGMARK);
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if (mark) {
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int stat;
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funcname = lua_pushlstring(L, modname, mark - modname);
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funcname = lua_pushfstring(L, POF"%s", funcname);
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stat = ll_loadfunc(L, filename, funcname);
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if (stat != ERRFUNC) return stat;
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modname = mark + 1; /* else go ahead and try old-style name */
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}
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funcname = lua_pushfstring(L, POF"%s", modname);
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return ll_loadfunc(L, filename, funcname);
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}
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static int searcher_C (lua_State *L) {
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const char *name = luaL_checkstring(L, 1);
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const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);
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if (filename == NULL) return 1; /* module not found in this path */
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return checkload(L, (loadfunc(L, filename, name) == 0), filename);
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}
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static int searcher_Croot (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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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", LUA_CSUBSEP);
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if (filename == NULL) return 1; /* root not found */
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if ((stat = loadfunc(L, filename, name)) != 0) {
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if (stat != ERRFUNC)
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return checkload(L, 0, filename); /* real error */
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else { /* open function not found */
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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;
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}
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}
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lua_pushstring(L, filename); /* will be 2nd argument to module */
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return 2;
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}
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static int searcher_preload (lua_State *L) {
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const char *name = luaL_checkstring(L, 1);
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lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD");
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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 void findloader (lua_State *L, const char *name) {
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int i;
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luaL_Buffer msg; /* to build error message */
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luaL_buffinit(L, &msg);
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lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */
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if (!lua_istable(L, 3))
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luaL_error(L, LUA_QL("package.searchers") " must be a table");
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/* iterate over available seachers to find a loader */
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for (i = 1; ; i++) {
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lua_rawgeti(L, 3, i); /* get a seacher */
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if (lua_isnil(L, -1)) { /* no more searchers? */
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lua_pop(L, 1); /* remove nil */
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luaL_pushresult(&msg); /* create error message */
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luaL_error(L, "module " LUA_QS " not found:%s",
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name, lua_tostring(L, -1));
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}
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lua_pushstring(L, name);
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lua_call(L, 1, 2); /* call it */
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if (lua_isfunction(L, -2)) /* did it find a loader? */
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return; /* module loader found */
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else if (lua_isstring(L, -2)) { /* searcher returned error message? */
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lua_pop(L, 1); /* remove extra return */
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luaL_addvalue(&msg); /* concatenate error message */
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}
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else
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lua_pop(L, 2); /* remove both returns */
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}
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}
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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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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); /* _LOADED[name] */
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if (lua_toboolean(L, -1)) /* is it there? */
|
|
return 1; /* package is already loaded */
|
|
/* else must load package */
|
|
lua_pop(L, 1); /* remove 'getfield' result */
|
|
findloader(L, name);
|
|
lua_pushstring(L, name); /* pass name as argument to module loader */
|
|
lua_insert(L, -2); /* name is 1st argument (before search data) */
|
|
lua_call(L, 2, 1); /* run loader to load module */
|
|
if (!lua_isnil(L, -1)) /* non-nil return? */
|
|
lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
|
|
lua_getfield(L, 2, name);
|
|
if (lua_isnil(L, -1)) { /* module did not set a value? */
|
|
lua_pushboolean(L, 1); /* use true as result */
|
|
lua_pushvalue(L, -1); /* extra copy to be returned */
|
|
lua_setfield(L, 2, name); /* _LOADED[name] = true */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** 'module' function
|
|
** =======================================================
|
|
*/
|
|
#if defined(LUA_COMPAT_MODULE)
|
|
|
|
/*
|
|
** changes the environment variable of calling function
|
|
*/
|
|
static void set_env (lua_State *L) {
|
|
lua_Debug ar;
|
|
if (lua_getstack(L, 1, &ar) == 0 ||
|
|
lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
|
|
lua_iscfunction(L, -1))
|
|
luaL_error(L, LUA_QL("module") " not called from a Lua function");
|
|
lua_pushvalue(L, -2); /* copy new environment table to top */
|
|
lua_setupvalue(L, -2, 1);
|
|
lua_pop(L, 1); /* remove function */
|
|
}
|
|
|
|
|
|
static void dooptions (lua_State *L, int n) {
|
|
int i;
|
|
for (i = 2; i <= n; i++) {
|
|
if (lua_isfunction(L, i)) { /* avoid 'calling' extra info. */
|
|
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 lastarg = lua_gettop(L); /* last parameter */
|
|
luaL_pushmodule(L, modname, 1); /* get/create module 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);
|
|
set_env(L);
|
|
dooptions(L, lastarg);
|
|
return 1;
|
|
}
|
|
|
|
|
|
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_pushglobaltable(L);
|
|
lua_setfield(L, -2, "__index"); /* mt.__index = _G */
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
/* auxiliary mark (for internal use) */
|
|
#define AUXMARK "\1"
|
|
|
|
|
|
/*
|
|
** return registry.LUA_NOENV as a boolean
|
|
*/
|
|
static int noenv (lua_State *L) {
|
|
int b;
|
|
lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
|
b = lua_toboolean(L, -1);
|
|
lua_pop(L, 1); /* remove value */
|
|
return b;
|
|
}
|
|
|
|
|
|
static void setpath (lua_State *L, const char *fieldname, const char *envname1,
|
|
const char *envname2, const char *def) {
|
|
const char *path = getenv(envname1);
|
|
if (path == NULL) /* no environment variable? */
|
|
path = getenv(envname2); /* try alternative name */
|
|
if (path == NULL || noenv(L)) /* 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_PATH_SEP LUA_PATH_SEP,
|
|
LUA_PATH_SEP AUXMARK LUA_PATH_SEP);
|
|
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},
|
|
{"searchpath", ll_searchpath},
|
|
#if defined(LUA_COMPAT_MODULE)
|
|
{"seeall", ll_seeall},
|
|
#endif
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const luaL_Reg ll_funcs[] = {
|
|
#if defined(LUA_COMPAT_MODULE)
|
|
{"module", ll_module},
|
|
#endif
|
|
{"require", ll_require},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const lua_CFunction searchers[] =
|
|
{searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};
|
|
|
|
|
|
LUAMOD_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_newlib(L, pk_funcs);
|
|
/* create 'searchers' table */
|
|
lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);
|
|
/* fill it with pre-defined searchers */
|
|
for (i=0; searchers[i] != NULL; i++) {
|
|
lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */
|
|
lua_pushcclosure(L, searchers[i], 1);
|
|
lua_rawseti(L, -2, i+1);
|
|
}
|
|
#if defined(LUA_COMPAT_LOADERS)
|
|
lua_pushvalue(L, -1); /* make a copy of 'searchers' table */
|
|
lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */
|
|
#endif
|
|
lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */
|
|
/* set field 'path' */
|
|
setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT);
|
|
/* set field 'cpath' */
|
|
setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT);
|
|
/* store config information */
|
|
lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"
|
|
LUA_EXEC_DIR "\n" LUA_IGMARK "\n");
|
|
lua_setfield(L, -2, "config");
|
|
/* set field `loaded' */
|
|
luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
|
|
lua_setfield(L, -2, "loaded");
|
|
/* set field `preload' */
|
|
luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD");
|
|
lua_setfield(L, -2, "preload");
|
|
lua_pushglobaltable(L);
|
|
lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */
|
|
luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */
|
|
lua_pop(L, 1); /* pop global table */
|
|
return 1; /* return 'package' table */
|
|
}
|
|
|