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Diffstat (limited to 'src/lib/loadlib.c')
| -rw-r--r-- | src/lib/loadlib.c | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/src/lib/loadlib.c b/src/lib/loadlib.c deleted file mode 100644 index 63bc0bcc..00000000 --- a/src/lib/loadlib.c +++ /dev/null @@ -1,429 +0,0 @@ -/* -** $Id: loadlib.c,v 1.11 2004/11/19 15:52:12 roberto Exp $ -** Dynamic library loader for Lua -** See Copyright Notice in lua.h -* -* This Lua library exports a single function, called loadlib, which -* is called from Lua as loadlib(lib,init), where lib is the full -* name of the library to be loaded (including the complete path) and -* init is the name of a function to be called after the library is -* loaded. Typically, this function will register other functions, thus -* making the complete library available to Lua. The init function is -* *not* automatically called by loadlib. Instead, loadlib returns the -* init function as a Lua function that the client can call when it -* thinks is appropriate. In the case of errors, loadlib returns nil and -* two strings describing the error. The first string is supplied by -* the operating system; it should be informative and useful for error -* messages. The second string is "open", "init", or "absent" to identify -* the error and is meant to be used for making decisions without having -* to look into the first string (whose format is system-dependent). -* This module contains an implementation of loadlib for Unix systems -* that have dlfcn, an implementation for Darwin (Mac OS X), an -* implementation for Windows, and a stub for other systems. See -* the list at the end of this file for some links to available -* implementations of dlfcn and interfaces to other native dynamic -* loaders on top of which loadlib could be implemented. -*/ - - -#include <stdlib.h> -#include <string.h> - - -#define loadlib_c -#define LUA_LIB - -#include "lua.h" -#include "lauxlib.h" -#include "lualib.h" - - -#define ERR_OPEN 1 -#define ERR_FUNCTION 2 - - -static void registerlib (lua_State *L, const void *lib); - - -#if defined(USE_DLOPEN) -/* -* This is an implementation of loadlib based on the dlfcn interface. -* The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, -* NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least -* as an emulation layer on top of native functions. -*/ - -#include <dlfcn.h> - -#define freelib dlclose - -static int loadlib(lua_State *L, const char *path, const char *init) -{ - void *lib=dlopen(path,RTLD_NOW); - if (lib!=NULL) - { - lua_CFunction f=(lua_CFunction) dlsym(lib,init); - if (f!=NULL) - { - registerlib(L, lib); - lua_pushcfunction(L,f); - return 0; - } - } - /* else return appropriate error message */ - lua_pushstring(L,dlerror()); - if (lib!=NULL) { - dlclose(lib); - return ERR_FUNCTION; /* error loading function */ - } - else return ERR_OPEN; /* error loading library */ -} - - - -#elif defined(USE_DLL) -/* -* This is an implementation of loadlib for Windows using native functions. -*/ - -#include <windows.h> - -#define freelib(lib) FreeLibrary((HINSTANCE)lib) - -static void pusherror(lua_State *L) -{ - int error=GetLastError(); - char buffer[128]; - if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, - 0, error, 0, buffer, sizeof(buffer), 0)) - lua_pushstring(L,buffer); - else - lua_pushfstring(L,"system error %d\n",error); -} - -static int loadlib(lua_State *L, const char *path, const char *init) -{ - HINSTANCE lib=LoadLibrary(path); - if (lib!=NULL) - { - lua_CFunction f=(lua_CFunction) GetProcAddress(lib,init); - if (f!=NULL) - { - registerlib(L, lib); - lua_pushcfunction(L,f); - return 1; - } - } - pusherror(L); - if (lib!=NULL) { - FreeLibrary(lib); - return ERR_OPEN; - } - else return ERR_FUNCTION; -} - - - -/* Native Mac OS X / Darwin Implementation */ -#elif defined(USE_DYLD) - -#include <mach-o/dyld.h> - - -/* Mach cannot unload images (?) */ -#define freelib(lib) ((void)lib) - -static void pusherror (lua_State *L) -{ - const char *err_str; - const char *err_file; - NSLinkEditErrors err; - int err_num; - NSLinkEditError(&err, &err_num, &err_file, &err_str); - lua_pushstring(L, err_str); -} - -static int loadlib (lua_State *L, const char *path, const char *init) { - const struct mach_header *lib; - /* this would be a rare case, but prevents crashing if it happens */ - if(!_dyld_present()) { - lua_pushstring(L,"dyld not present."); - return ERR_OPEN; - } - lib = NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR); - if(lib != NULL) { - NSSymbol init_sym = NSLookupSymbolInImage(lib, init, - NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | - NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); - if(init_sym != NULL) { - lua_CFunction f = (lua_CFunction)NSAddressOfSymbol(init_sym); - registerlib(L, lib); - lua_pushcfunction(L,f); - return 0; - } - } - /* else an error ocurred */ - pusherror(L); - /* Can't unload image */ - return (lib != NULL) ? ERR_FUNCTION : ERR_OPEN; -} - - - -#else -/* Fallback for other systems */ - - -#define freelib(lib) ((void)lib) - -static int loadlib(lua_State *L) -{ - registerlib(L, NULL); /* to avoid warnings */ - lua_pushnil(L); - lua_pushliteral(L,"`loadlib' not supported"); - lua_pushliteral(L,"absent"); - return 3; -} - -#endif - - -/* -** common code for all implementations: put a library into the registry -** so that, when Lua closes its state, the library's __gc metamethod -** will be called to unload the library. -*/ -static void registerlib (lua_State *L, const void *lib) -{ - const void **plib = (const void **)lua_newuserdata(L, sizeof(const void *)); - *plib = lib; - luaL_getmetatable(L, "_LOADLIB"); - lua_setmetatable(L, -2); - lua_pushboolean(L, 1); - lua_settable(L, LUA_REGISTRYINDEX); /* registry[lib] = true */ -} - -/* -** __gc tag method: calls library's `freelib' function with the lib -** handle -*/ -static int gctm (lua_State *L) -{ - void *lib = *(void **)luaL_checkudata(L, 1, "_LOADLIB"); - freelib(lib); - return 0; -} - - -static int loadlib1 (lua_State *L) { - const char *path=luaL_checkstring(L,1); - const char *init=luaL_checkstring(L,2); - int res = loadlib(L,path,init); - if (res == 0) /* no error? */ - return 1; /* function is at stack top */ - else { /* error */ - lua_pushnil(L); - lua_insert(L,-2); /* insert nil before error message */ - lua_pushstring(L, (res==ERR_OPEN)?"open":"init"); - return 3; - } -} - - - -/* -** {====================================================== -** `require' and `module' functions -** ======================================================= -*/ - - -static const char *loadLua (lua_State *L, const char *fname, const char *name) { - const char *path; - /* try first `LUA_PATH' for compatibility */ - lua_getglobal(L, "LUA_PATH"); - path = lua_tostring(L, -1); - if (!path) { - lua_pop(L, 1); - luaL_getfield(L, LUA_GLOBALSINDEX, "package.path"); - path = lua_tostring(L, -1); - } - if (path == NULL) - luaL_error(L, "`package.path' must be a string"); - fname = luaL_searchpath(L, fname, path); - if (fname == NULL) return path; /* library not found in this path */ - if (luaL_loadfile(L, fname) != 0) - luaL_error(L, "error loading package `%s' (%s)", name, lua_tostring(L, -1)); - return NULL; /* library loaded successfully */ -} - - -static const char *loadC (lua_State *L, const char *fname, const char *name) { - const char *path; - const char *funcname; - luaL_getfield(L, LUA_GLOBALSINDEX, "package.cpath"); - path = lua_tostring(L, -1); - if (path == NULL) - luaL_error(L, "global _CPATH must be a string"); - fname = luaL_searchpath(L, fname, path); - if (fname == NULL) return path; /* library not found in this path */ - funcname = luaL_gsub(L, name, ".", ""); - funcname = lua_pushfstring(L, "%s%s", LUA_POF, funcname); - if (loadlib(L, fname, funcname) != 0) - luaL_error(L, "error loading package `%s' (%s)", name, lua_tostring(L, -1)); - return NULL; /* library loaded successfully */ -} - - -static int ll_require (lua_State *L) { - const char *name = luaL_checkstring(L, 1); - lua_settop(L, 1); - lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); - lua_getfield(L, 2, name); - if (lua_toboolean(L, -1)) /* is it there? */ - return 1; /* package is already loaded; return its result */ - /* else must load it; first mark it as loaded */ - lua_pushboolean(L, 1); - lua_setfield(L, 2, name); /* _LOADED[name] = true */ - /* check whether it is preloaded */ - lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); - lua_getfield(L, -1, name); - if (lua_isnil(L, -1)) { /* no preload function for that module? */ - const char *fname = luaL_gsub(L, name, ".", LUA_DIRSEP); - const char *cpath = loadC(L, fname, name); /* try a C module */ - if (cpath) { /* not found? */ - const char *path = loadLua(L, fname, name); /* try a Lua module */ - if (path) { /* yet not found? */ - lua_pushnil(L); - lua_setfield(L, 2, name); /* unmark _LOADED[name] */ - return luaL_error(L, "package `%s' not found\n" - " cpath: %s\n path: %s", - name, cpath, path); - } - } - } - lua_pushvalue(L, 1); /* pass name as argument to module */ - lua_call(L, 1, 1); /* run loaded module */ - if (!lua_isnil(L, -1)) /* non-nil return? */ - lua_setfield(L, 2, name); /* update _LOADED[name] with returned value */ - lua_getfield(L, 2, name); /* return _LOADED[name] */ - return 1; -} - - -static void setfenv (lua_State *L) { - lua_Debug ar; - lua_getstack(L, 1, &ar); - lua_getinfo(L, "f", &ar); - lua_pushvalue(L, -2); - lua_setfenv(L, -2); -} - - -static int ll_module (lua_State *L) { - const char *modname = luaL_checkstring(L, 1); - const char *dot; - lua_settop(L, 1); - lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); - /* try to find given table */ - luaL_getfield(L, LUA_GLOBALSINDEX, modname); - if (lua_isnil(L, -1)) { /* not found? */ - lua_pop(L, 1); /* remove previous result */ - lua_newtable(L); /* create it */ - /* register it with given name */ - lua_pushvalue(L, -1); - luaL_setfield(L, LUA_GLOBALSINDEX, modname); - } - else if (!lua_istable(L, -1)) - return luaL_error(L, "name conflict for module `%s'", modname); - /* 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); - lua_newtable(L); /* create new metatable */ - lua_pushvalue(L, LUA_GLOBALSINDEX); - lua_setfield(L, -2, "__index"); /* mt.__index = _G */ - lua_setmetatable(L, -2); - 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"); - } - lua_pushvalue(L, -1); - lua_setfield(L, 2, modname); /* _LOADED[modname] = new table */ - setfenv(L); - return 0; -} - - -/* }====================================================== */ - - -static const luaL_reg ll_funcs[] = { - {"loadlib", loadlib1}, - {"require", ll_require}, - {"module", ll_module}, - {NULL, NULL} -}; - - - -LUALIB_API int luaopen_loadlib (lua_State *L) { - const char *path; - /* create new type _LOADLIB */ - luaL_newmetatable(L, "_LOADLIB"); - lua_pushcfunction(L, gctm); - lua_setfield(L, -2, "__gc"); - /* create `package' table */ - lua_newtable(L); - lua_pushvalue(L, -1); - lua_setglobal(L, "package"); - /* set field `path' */ - path = getenv(LUA_PATH); - if (path == NULL) path = LUA_PATH_DEFAULT; - lua_pushstring(L, path); - lua_setfield(L, -2, "path"); - /* set field `cpath' */ - path = getenv(LUA_CPATH); - if (path == NULL) path = LUA_CPATH_DEFAULT; - lua_pushstring(L, path); - lua_setfield(L, -2, "cpath"); - /* set field `loaded' */ - lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); - lua_setfield(L, -2, "loaded"); - /* set field `preload' */ - lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); - lua_setfield(L, -2, "preload"); - lua_pushvalue(L, LUA_GLOBALSINDEX); - luaL_openlib(L, NULL, ll_funcs, 0); /* open lib into global table */ - return 1; -} - -/* -* Here are some links to available implementations of dlfcn and -* interfaces to other native dynamic loaders on top of which loadlib -* could be implemented. Please send contributions and corrections to us. -* -* AIX -* Starting with AIX 4.2, dlfcn is included in the base OS. -* There is also an emulation package available. -* http://www.faqs.org/faqs/aix-faq/part4/section-21.html -* -* HPUX -* HPUX 11 has dlfcn. For HPUX 10 use shl_*. -* http://www.geda.seul.org/mailinglist/geda-dev37/msg00094.html -* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html -* -* Macintosh, Windows -* http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html -* -* GLIB has wrapper code for BeOS, OS2, Unix and Windows -* http://cvs.gnome.org/lxr/source/glib/gmodule/ -* -*/ |