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790 lines
23 KiB
790 lines
23 KiB
/* |
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** $Id: loadlib.c,v 1.130.1.1 2017/04/19 17:20:42 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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#define loadlib_c |
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#define LUA_LIB |
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#include "lprefix.h" |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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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_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_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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/* |
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** unique key for table in the registry that keeps handles |
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** for all loaded C libraries |
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*/ |
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static const int CLIBS = 0; |
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#define LIB_FAIL "open" |
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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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/* |
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** unload library 'lib' |
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*/ |
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static void lsys_unloadlib (void *lib); |
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/* |
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** load C library in file 'path'. If 'seeglb', load with all names in |
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** the library global. |
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** Returns the library; in case of error, returns NULL plus an |
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** error string in the stack. |
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*/ |
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static void *lsys_load (lua_State *L, const char *path, int seeglb); |
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/* |
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** Try to find a function named 'sym' in library 'lib'. |
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** Returns the function; in case of error, returns NULL plus an |
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** error string in the stack. |
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*/ |
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static lua_CFunction lsys_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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/* |
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** Macro to convert pointer-to-void* to pointer-to-function. This cast |
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** is undefined according to ISO C, but POSIX assumes that it works. |
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** (The '__extension__' in gnu compilers is only to avoid warnings.) |
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*/ |
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#if defined(__GNUC__) |
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#define cast_func(p) (__extension__ (lua_CFunction)(p)) |
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#else |
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#define cast_func(p) ((lua_CFunction)(p)) |
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#endif |
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static void lsys_unloadlib (void *lib) { |
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dlclose(lib); |
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} |
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static void *lsys_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 lsys_sym (lua_State *L, void *lib, const char *sym) { |
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lua_CFunction f = cast_func(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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/* |
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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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#undef setprogdir |
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/* |
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** Replace in the path (on the top of the stack) any occurrence |
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** of LUA_EXEC_DIR with the executable's path. |
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*/ |
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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); /* get exec. name */ |
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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'; /* cut name on the last '\\' to get the path */ |
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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 lsys_unloadlib (void *lib) { |
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FreeLibrary((HMODULE)lib); |
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} |
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static void *lsys_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 lsys_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 lsys_unloadlib (void *lib) { |
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(void)(lib); /* not used */ |
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} |
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static void *lsys_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 lsys_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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/* |
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** {================================================================== |
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** Set Paths |
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** =================================================================== |
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*/ |
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/* |
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** LUA_PATH_VAR and LUA_CPATH_VAR 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_VAR) |
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#define LUA_PATH_VAR "LUA_PATH" |
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#endif |
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#if !defined(LUA_CPATH_VAR) |
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#define LUA_CPATH_VAR "LUA_CPATH" |
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#endif |
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#define AUXMARK "\1" /* auxiliary mark */ |
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/* |
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** return registry.LUA_NOENV as a boolean |
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*/ |
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static int noenv (lua_State *L) { |
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int b; |
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lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); |
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b = lua_toboolean(L, -1); |
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lua_pop(L, 1); /* remove value */ |
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return b; |
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} |
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/* |
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** Set a path |
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*/ |
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static void setpath (lua_State *L, const char *fieldname, |
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const char *envname, |
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const char *dft) { |
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const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX); |
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const char *path = getenv(nver); /* use versioned name */ |
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if (path == NULL) /* no environment variable? */ |
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path = getenv(envname); /* try unversioned name */ |
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if (path == NULL || noenv(L)) /* no environment variable? */ |
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lua_pushstring(L, dft); /* use default */ |
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else { |
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/* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */ |
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path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP, |
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LUA_PATH_SEP AUXMARK LUA_PATH_SEP); |
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luaL_gsub(L, path, AUXMARK, dft); |
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lua_remove(L, -2); /* remove result from 1st 'gsub' */ |
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} |
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setprogdir(L); |
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lua_setfield(L, -3, fieldname); /* package[fieldname] = path value */ |
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lua_pop(L, 1); /* pop versioned variable name */ |
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} |
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/* }================================================================== */ |
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/* |
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** return registry.CLIBS[path] |
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*/ |
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static void *checkclib (lua_State *L, const char *path) { |
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void *plib; |
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lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); |
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lua_getfield(L, -1, path); |
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plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ |
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lua_pop(L, 2); /* pop CLIBS table and 'plib' */ |
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return plib; |
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} |
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/* |
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** registry.CLIBS[path] = plib -- for queries |
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** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries |
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*/ |
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static void addtoclib (lua_State *L, const char *path, void *plib) { |
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lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); |
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lua_pushlightuserdata(L, plib); |
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lua_pushvalue(L, -1); |
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lua_setfield(L, -3, path); /* CLIBS[path] = plib */ |
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lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ |
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lua_pop(L, 1); /* pop CLIBS table */ |
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} |
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/* |
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** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib |
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** handles in list CLIBS |
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*/ |
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static int gctm (lua_State *L) { |
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lua_Integer n = luaL_len(L, 1); |
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for (; n >= 1; n--) { /* for each handle, in reverse order */ |
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lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ |
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lsys_unloadlib(lua_touserdata(L, -1)); |
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lua_pop(L, 1); /* pop handle */ |
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} |
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return 0; |
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} |
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/* error codes for 'lookforfunc' */ |
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#define ERRLIB 1 |
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#define ERRFUNC 2 |
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/* |
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** Look for a C function named 'sym' in a dynamically loaded library |
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** 'path'. |
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** First, check whether the library is already loaded; if not, try |
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** to load it. |
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** Then, if 'sym' is '*', return true (as library has been loaded). |
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** Otherwise, look for symbol 'sym' in the library and push a |
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** C function with that symbol. |
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** Return 0 and 'true' or a function in the stack; in case of |
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** errors, return an error code and an error message in the stack. |
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*/ |
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static int lookforfunc (lua_State *L, const char *path, const char *sym) { |
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void *reg = checkclib(L, path); /* check loaded C libraries */ |
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if (reg == NULL) { /* must load library? */ |
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reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ |
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if (reg == NULL) return ERRLIB; /* unable to load library */ |
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addtoclib(L, path, reg); |
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} |
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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 = lsys_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 = lookforfunc(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 '%s'", 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, "'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 '%s' from file '%s':\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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/* |
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** Try to find a load function for module 'modname' at file 'filename'. |
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** First, change '.' to '_' in 'modname'; then, if 'modname' has |
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** the form X-Y (that is, it has an "ignore mark"), build a function |
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** name "luaopen_X" and look for it. (For compatibility, if that |
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** fails, it also tries "luaopen_Y".) If there is no ignore mark, |
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** look for a function named "luaopen_modname". |
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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 *openfunc; |
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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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openfunc = lua_pushlstring(L, modname, mark - modname); |
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openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); |
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stat = lookforfunc(L, filename, openfunc); |
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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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openfunc = lua_pushfstring(L, LUA_POF"%s", modname); |
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return lookforfunc(L, filename, openfunc); |
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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 '%s' in file '%s'", 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, LUA_PRELOAD_TABLE); |
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if (lua_getfield(L, -1, name) == LUA_TNIL) /* 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) { |
|
int i; |
|
luaL_Buffer msg; /* to build error message */ |
|
luaL_buffinit(L, &msg); |
|
/* push 'package.searchers' to index 3 in the stack */ |
|
if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE) |
|
luaL_error(L, "'package.searchers' must be a table"); |
|
/* iterate over available searchers to find a loader */ |
|
for (i = 1; ; i++) { |
|
if (lua_rawgeti(L, 3, i) == LUA_TNIL) { /* no more searchers? */ |
|
lua_pop(L, 1); /* remove nil */ |
|
luaL_pushresult(&msg); /* create error message */ |
|
luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1)); |
|
} |
|
lua_pushstring(L, name); |
|
lua_call(L, 1, 2); /* call it */ |
|
if (lua_isfunction(L, -2)) /* did it find a loader? */ |
|
return; /* module loader found */ |
|
else if (lua_isstring(L, -2)) { /* searcher returned error message? */ |
|
lua_pop(L, 1); /* remove extra return */ |
|
luaL_addvalue(&msg); /* concatenate error message */ |
|
} |
|
else |
|
lua_pop(L, 2); /* remove both returns */ |
|
} |
|
} |
|
|
|
|
|
static int ll_require (lua_State *L) { |
|
const char *name = luaL_checkstring(L, 1); |
|
lua_settop(L, 1); /* LOADED table will be at index 2 */ |
|
lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); |
|
lua_getfield(L, 2, name); /* LOADED[name] */ |
|
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 */ |
|
if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no 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, "'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 */ |
|
if (lua_getfield(L, -1, "_NAME") != LUA_TNIL) |
|
lua_pop(L, 1); /* table is an initialized module */ |
|
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 |
|
/* }====================================================== */ |
|
|
|
|
|
|
|
static const luaL_Reg pk_funcs[] = { |
|
{"loadlib", ll_loadlib}, |
|
{"searchpath", ll_searchpath}, |
|
#if defined(LUA_COMPAT_MODULE) |
|
{"seeall", ll_seeall}, |
|
#endif |
|
/* placeholders */ |
|
{"preload", NULL}, |
|
{"cpath", NULL}, |
|
{"path", NULL}, |
|
{"searchers", NULL}, |
|
{"loaded", NULL}, |
|
{NULL, NULL} |
|
}; |
|
|
|
|
|
static const luaL_Reg ll_funcs[] = { |
|
#if defined(LUA_COMPAT_MODULE) |
|
{"module", ll_module}, |
|
#endif |
|
{"require", ll_require}, |
|
{NULL, NULL} |
|
}; |
|
|
|
|
|
static void createsearcherstable (lua_State *L) { |
|
static const lua_CFunction searchers[] = |
|
{searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL}; |
|
int i; |
|
/* create 'searchers' table */ |
|
lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); |
|
/* fill it with predefined 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' */ |
|
} |
|
|
|
|
|
/* |
|
** create table CLIBS to keep track of loaded C libraries, |
|
** setting a finalizer to close all libraries when closing state. |
|
*/ |
|
static void createclibstable (lua_State *L) { |
|
lua_newtable(L); /* create CLIBS table */ |
|
lua_createtable(L, 0, 1); /* create metatable for CLIBS */ |
|
lua_pushcfunction(L, gctm); |
|
lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ |
|
lua_setmetatable(L, -2); |
|
lua_rawsetp(L, LUA_REGISTRYINDEX, &CLIBS); /* set CLIBS table in registry */ |
|
} |
|
|
|
|
|
LUAMOD_API int luaopen_package (lua_State *L) { |
|
createclibstable(L); |
|
luaL_newlib(L, pk_funcs); /* create 'package' table */ |
|
createsearcherstable(L); |
|
/* set paths */ |
|
setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT); |
|
setpath(L, "cpath", LUA_CPATH_VAR, 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, LUA_LOADED_TABLE); |
|
lua_setfield(L, -2, "loaded"); |
|
/* set field 'preload' */ |
|
luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); |
|
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 */ |
|
} |
|
|
|
|