lua/src/loadlib_rel.c at lua-5.1 · git99969/lua · GitHub

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** $Id: loadlib.c,v 1.52.1.3 2008/08/06 13:29:28 roberto Exp $

** Dynamic library loader for Lua

** See Copyright Notice in lua.h

** 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.

#include <stdlib.h>

#include <string.h>

#define loadlib_c

#define LUA_LIB

#include "lua.h"

#include "lauxlib.h"

#include "lualib.h"

/* prefix for open functions in C libraries */

#define LUA_POF "luaopen_"

/* separator for open functions in C libraries */

#define LUA_OFSEP "_"

#define LIBPREFIX "LOADLIB: "

#define POF LUA_POF

#define LIB_FAIL "open"

/* error codes for ll_loadfunc */

#define ERRLIB 1

#define ERRFUNC 2

static void ll_unloadlib (void *lib);

static void *ll_load (lua_State *L, const char *path);

static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);

static void setprogdir (lua_State *L);

** {=========================================================================

** This determines the location of the executable for relative module loading

** Modified by the LuaDist project for UNIX platforms

** ==========================================================================

#if defined(_WIN32)

#include <windows.h>

#define _PATH_MAX MAX_PATH

#else

#define _PATH_MAX PATH_MAX

#endif

#if defined(__CYGWIN__)

#include <sys/cygwin.h>

#endif

#if defined(__linux__) || defined(__sun)

#include <unistd.h> /* readlink */

#endif

#if defined(__APPLE__)

#include <sys/param.h>

#include <mach-o/dyld.h>

#endif

#if defined(__FreeBSD__)

#include <sys/types.h>

#include <sys/sysctl.h>

#endif

static void setprogdir(lua_State *L) {

char progdir[_PATH_MAX + 1];

char *lb;

int nsize = sizeof(progdir)/sizeof(char);

int n = 0;

#if defined(__CYGWIN__)

char win_buff[_PATH_MAX + 1];

GetModuleFileNameA(NULL, win_buff, nsize);

cygwin_conv_path (CCP_WIN_A_TO_POSIX, win_buff, progdir, nsize);

n = strlen(progdir);

#elif defined(_WIN32)

n = GetModuleFileNameA(NULL, progdir, nsize);

#elif defined(__linux__)

n = readlink("/proc/self/exe", progdir, nsize);

if (n > 0) progdir[n] = 0;

#elif defined(__sun)

pid_t pid = getpid();

char linkname[256];

sprintf(linkname, "/proc/%d/path/a.out", pid);

n = readlink(linkname, progdir, nsize);

if (n > 0) progdir[n] = 0;

#elif defined(__FreeBSD__)

int mib[4];

mib[0] = CTL_KERN;

mib[1] = KERN_PROC;

mib[2] = KERN_PROC_PATHNAME;

mib[3] = -1;

size_t cb = nsize;

sysctl(mib, 4, progdir, &cb, NULL, 0);

n = cb;

#elif defined(__BSD__)

n = readlink("/proc/curproc/file", progdir, nsize);

if (n > 0) progdir[n] = 0;

#elif defined(__APPLE__)

uint32_t nsize_apple = nsize;

if (_NSGetExecutablePath(progdir, &nsize_apple) == 0)

n = strlen(progdir);

#else

// FALLBACK

// Use 'lsof' ... should work on most UNIX systems (incl. OSX)

// lsof will list open files, this captures the 1st file listed (usually the executable)

int pid;

FILE* fd;

char cmd[80];

pid = getpid();

sprintf(cmd, "lsof -p %d | awk '{if ($5==\"REG\") { print $9 ; exit}}' 2> /dev/null", pid);

fd = popen(cmd, "r");

n = fread(progdir, 1, nsize, fd);

pclose(fd);

// remove newline

if (n > 1) progdir[--n] = '\0';

#endif

if (n == 0 || n == nsize || (lb = strrchr(progdir, (int)LUA_DIRSEP[0])) == NULL)

luaL_error(L, "unable to get process executable path");

else {

*lb = '\0';

// Replace the relative path placeholder

luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, progdir);

lua_remove(L, -2);

}

/* }====================================================== */

#if defined(LUA_DL_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>

#include <sys/stat.h>

static void ll_unloadlib (void *lib) {

dlclose(lib);

}

static void *ll_load (lua_State *L, const char *path) {

void *lib = dlopen(path, RTLD_NOW);

if (lib == NULL) lua_pushstring(L, dlerror());

return lib;

}

static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {

lua_CFunction f = (lua_CFunction)dlsym(lib, sym);

if (f == NULL) lua_pushstring(L, dlerror());

return f;

}

/* }====================================================== */

#elif defined(LUA_DL_DLL)

** {======================================================================

** This is an implementation of loadlib for Windows using native functions.

** =======================================================================

#include <windows.h>

static void pusherror (lua_State *L) {

int error = GetLastError();

char buffer[128];

if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,

NULL, error, 0, buffer, sizeof(buffer), NULL))

lua_pushstring(L, buffer);

else

lua_pushfstring(L, "system error %d\n", error);

}

static void ll_unloadlib (void *lib) {

FreeLibrary((HINSTANCE)lib);

}

static void *ll_load (lua_State *L, const char *path) {

HINSTANCE lib = LoadLibraryA(path);

if (lib == NULL) pusherror(L);

return lib;

}

static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {

lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);

if (f == NULL) pusherror(L);

return f;

}

/* }====================================================== */

#elif defined(LUA_DL_DYLD)

** {======================================================================

** Native Mac OS X / Darwin Implementation

** =======================================================================

#include <mach-o/dyld.h>

/* Mac appends a `_' before C function names */

#undef POF

#define POF "_" LUA_POF

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 const char *errorfromcode (NSObjectFileImageReturnCode ret) {

switch (ret) {

case NSObjectFileImageInappropriateFile:

return "file is not a bundle";

case NSObjectFileImageArch:

return "library is for wrong CPU type";

case NSObjectFileImageFormat:

return "bad format";

case NSObjectFileImageAccess:

return "cannot access file";

case NSObjectFileImageFailure:

default:

return "unable to load library";

}

static void ll_unloadlib (void *lib) {

NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);

}

static void *ll_load (lua_State *L, const char *path) {

NSObjectFileImage img;

NSObjectFileImageReturnCode ret;

/* this would be a rare case, but prevents crashing if it happens */

if(!_dyld_present()) {

lua_pushliteral(L, "dyld not present");

return NULL;

}

ret = NSCreateObjectFileImageFromFile(path, &img);

if (ret == NSObjectFileImageSuccess) {

NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |

NSLINKMODULE_OPTION_RETURN_ON_ERROR);

NSDestroyObjectFileImage(img);

if (mod == NULL) pusherror(L);

return mod;

}

lua_pushstring(L, errorfromcode(ret));

return NULL;

}

static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {

NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);

if (nss == NULL) {

lua_pushfstring(L, "symbol " LUA_QS " not found", sym);

return NULL;

}

return (lua_CFunction)NSAddressOfSymbol(nss);

}

/* }====================================================== */

#else

** {======================================================

** Fallback for other systems

** =======================================================

#undef LIB_FAIL

#define LIB_FAIL "absent"

#define DLMSG "dynamic libraries not enabled; check your Lua installation"

static void ll_unloadlib (void *lib) {

(void)lib; /* to avoid warnings */

}

static void *ll_load (lua_State *L, const char *path) {

(void)path; /* to avoid warnings */

lua_pushliteral(L, DLMSG);

return NULL;

}

static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {

(void)lib; (void)sym; /* to avoid warnings */

lua_pushliteral(L, DLMSG);

return NULL;

}

/* }====================================================== */

#endif

static void **ll_register (lua_State *L, const char *path) {

void **plib;

lua_pushfstring(L, "%s%s", LIBPREFIX, path);

lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */

if (!lua_isnil(L, -1)) /* is there an entry? */

plib = (void **)lua_touserdata(L, -1);

else { /* no entry yet; create one */

lua_pop(L, 1);

plib = (void **)lua_newuserdata(L, sizeof(const void *));

*plib = NULL;

luaL_getmetatable(L, "_LOADLIB");

lua_setmetatable(L, -2);

lua_pushfstring(L, "%s%s", LIBPREFIX, path);

lua_pushvalue(L, -2);

lua_settable(L, LUA_REGISTRYINDEX);

}

return plib;

}

** __gc tag method: calls library's `ll_unloadlib' function with the lib

** handle

static int gctm (lua_State *L) {

void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");

if (*lib) ll_unloadlib(*lib);

*lib = NULL; /* mark library as closed */

return 0;

}

static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {

void **reg = ll_register(L, path);

if (*reg == NULL) *reg = ll_load(L, path);

if (*reg == NULL)

return ERRLIB; /* unable to load library */

else {

lua_CFunction f = ll_sym(L, *reg, sym);

if (f == NULL)

return ERRFUNC; /* unable to find function */

lua_pushcfunction(L, f);

return 0; /* return function */

}

static int ll_loadlib (lua_State *L) {

const char *path = luaL_checkstring(L, 1);

const char *init = luaL_checkstring(L, 2);

int stat = ll_loadfunc(L, path, init);

if (stat == 0) /* no errors? */

return 1; /* return the loaded function */

else { /* error; error message is on stack top */

lua_pushnil(L);

lua_insert(L, -2);

lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");

return 3; /* return nil, error message, and where */

}

** {======================================================

** 'require' function

** =======================================================

static int readable (const char *filename) {

FILE *f = fopen(filename, "r"); /* try to open file */

if (f == NULL) return 0; /* open failed */

fclose(f);

return 1;

}

static const char *pushnexttemplate (lua_State *L, const char *path) {

const char *l;

while (*path == *LUA_PATHSEP) path++; /* skip separators */

if (*path == '\0') return NULL; /* no more templates */

l = strchr(path, *LUA_PATHSEP); /* find next separator */

if (l == NULL) l = path + strlen(path);

lua_pushlstring(L, path, l - path); /* template */

return l;

}

static const char *findfile (lua_State *L, const char *name,

const char *pname) {

const char *path;

name = luaL_gsub(L, name, ".", LUA_DIRSEP);

lua_getfield(L, LUA_ENVIRONINDEX, pname);

path = lua_tostring(L, -1);

if (path == NULL)

luaL_error(L, LUA_QL("package.%s") " must be a string", pname);

lua_pushliteral(L, ""); /* error accumulator */

while ((path = pushnexttemplate(L, path)) != NULL) {

const char *filename;

filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);

lua_remove(L, -2); /* remove path template */

if (readable(filename)) /* does file exist and is readable? */

return filename; /* return that file name */

lua_pushfstring(L, "\n\tno file " LUA_QS, filename);

lua_remove(L, -2); /* remove file name */

lua_concat(L, 2); /* add entry to possible error message */

}

return NULL; /* not found */

}

static void loaderror (lua_State *L, const char *filename) {

luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",

lua_tostring(L, 1), filename, lua_tostring(L, -1));

}

static int loader_Lua (lua_State *L) {

const char *filename;

const char *name = luaL_checkstring(L, 1);

filename = findfile(L, name, "path");

if (filename == NULL) return 1; /* library not found in this path */

if (luaL_loadfile(L, filename) != 0)

loaderror(L, filename);

return 1; /* library loaded successfully */

}

static const char *mkfuncname (lua_State *L, const char *modname) {

const char *funcname;

const char *mark = strchr(modname, *LUA_IGMARK);

if (mark) modname = mark + 1;

funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);

funcname = lua_pushfstring(L, POF"%s", funcname);

lua_remove(L, -2); /* remove 'gsub' result */

return funcname;

}

static int loader_C (lua_State *L) {

const char *funcname;

const char *name = luaL_checkstring(L, 1);

const char *filename = findfile(L, name, "cpath");

if (filename == NULL) return 1; /* library not found in this path */

funcname = mkfuncname(L, name);

if (ll_loadfunc(L, filename, funcname) != 0)

loaderror(L, filename);

return 1; /* library loaded successfully */

}

static int loader_Croot (lua_State *L) {

const char *funcname;

const char *filename;

const char *name = luaL_checkstring(L, 1);

const char *p = strchr(name, '.');

int stat;

if (p == NULL) return 0; /* is root */

lua_pushlstring(L, name, p - name);

filename = findfile(L, lua_tostring(L, -1), "cpath");

if (filename == NULL) return 1; /* root not found */

funcname = mkfuncname(L, name);

if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {

if (stat != ERRFUNC) loaderror(L, filename); /* real error */

lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,

name, filename);

return 1; /* function not found */

}

return 1;

}

static int loader_preload (lua_State *L) {

const char *name = luaL_checkstring(L, 1);

lua_getfield(L, LUA_ENVIRONINDEX, "preload");

if (!lua_istable(L, -1))

luaL_error(L, LUA_QL("package.preload") " must be a table");

lua_getfield(L, -1, name);

if (lua_isnil(L, -1)) /* not found? */

lua_pushfstring(L, "\n\tno field package.preload['%s']", name);

return 1;

}

static const int sentinel_ = 0;

#define sentinel ((void *)&sentinel_)

static int ll_require (lua_State *L) {

const char *name = luaL_checkstring(L, 1);

int i;

lua_settop(L, 1); /* _LOADED table will be at index 2 */

lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");

lua_getfield(L, 2, name);

if (lua_toboolean(L, -1)) { /* is it there? */

if (lua_touserdata(L, -1) == sentinel) /* check loops */

luaL_error(L, "loop or previous error loading module " LUA_QS, name);

return 1; /* package is already loaded */

}

/* else must load it; iterate over available loaders */

lua_getfield(L, LUA_ENVIRONINDEX, "loaders");

if (!lua_istable(L, -1))

luaL_error(L, LUA_QL("package.loaders") " must be a table");

lua_pushliteral(L, ""); /* error message accumulator */

for (i=1; ; i++) {

lua_rawgeti(L, -2, i); /* get a loader */

if (lua_isnil(L, -1))

luaL_error(L, "module " LUA_QS " not found:%s",

name, lua_tostring(L, -2));

lua_pushstring(L, name);

lua_call(L, 1, 1); /* call it */

if (lua_isfunction(L, -1)) /* did it find module? */

break; /* module loaded successfully */

else if (lua_isstring(L, -1)) /* loader returned error message? */

lua_concat(L, 2); /* accumulate it */

else

lua_pop(L, 1);

}

lua_pushlightuserdata(L, sentinel);

lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */

lua_pushstring(L, name); /* 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); /* _LOADED[name] = returned value */

lua_getfield(L, 2, name);

if (lua_touserdata(L, -1) == sentinel) { /* 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

** =======================================================

static void setfenv (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);

lua_setfenv(L, -2);

lua_pop(L, 1);

}

static void dooptions (lua_State *L, int n) {

int i;

for (i = 2; i <= n; i++) {

lua_pushvalue(L, i); /* get option (a function) */

lua_pushvalue(L, -2); /* module */

lua_call(L, 1, 0);

}

static void modinit (lua_State *L, const char *modname) {

const char *dot;

lua_pushvalue(L, -1);

lua_setfield(L, -2, "_M"); /* module._M = module */

lua_pushstring(L, modname);

lua_setfield(L, -2, "_NAME");

dot = strrchr(modname, '.'); /* look for last dot in module name */

if (dot == NULL) dot = modname;

else dot++;

/* set _PACKAGE as package name (full module name minus last part) */

lua_pushlstring(L, modname, dot - modname);

lua_setfield(L, -2, "_PACKAGE");

}

static int ll_module (lua_State *L) {

const char *modname = luaL_checkstring(L, 1);

int loaded = lua_gettop(L) + 1; /* index of _LOADED table */

lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");

lua_getfield(L, loaded, modname); /* get _LOADED[modname] */

if (!lua_istable(L, -1)) { /* not found? */

lua_pop(L, 1); /* remove previous result */

/* try global variable (and create one if it does not exist) */

if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)

return luaL_error(L, "name conflict for module " LUA_QS, modname);

lua_pushvalue(L, -1);

lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */

}

/* check whether table already has a _NAME field */

lua_getfield(L, -1, "_NAME");

if (!lua_isnil(L, -1)) /* is table an initialized module? */

lua_pop(L, 1);

else { /* no; initialize it */

lua_pop(L, 1);

modinit(L, modname);

}

lua_pushvalue(L, -1);

setfenv(L);

dooptions(L, loaded - 1);

return 0;

}

static int ll_seeall (lua_State *L) {

luaL_checktype(L, 1, LUA_TTABLE);

if (!lua_getmetatable(L, 1)) {

lua_createtable(L, 0, 1); /* create new metatable */

lua_pushvalue(L, -1);

lua_setmetatable(L, 1);

}

lua_pushvalue(L, LUA_GLOBALSINDEX);

lua_setfield(L, -2, "__index"); /* mt.__index = _G */

return 0;

}

/* }====================================================== */

/* auxiliary mark (for internal use) */

#define AUXMARK "\1"

static void setpath (lua_State *L, const char *fieldname, const char *envname,

const char *def) {

const char *path = getenv(envname);

if (path == NULL) /* no environment variable? */

lua_pushstring(L, def); /* use default */

else {

/* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */

path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,

LUA_PATHSEP AUXMARK LUA_PATHSEP);

luaL_gsub(L, path, AUXMARK, def);

lua_remove(L, -2);

}

setprogdir(L);

lua_setfield(L, -2, fieldname);

}

static const luaL_Reg pk_funcs[] = {

{"loadlib", ll_loadlib},

{"seeall", ll_seeall},

{NULL, NULL}

};

static const luaL_Reg ll_funcs[] = {

{"module", ll_module},

{"require", ll_require},

{NULL, NULL}

};

static const lua_CFunction loaders[] =

{loader_preload, loader_Lua, loader_C, loader_Croot, NULL};

LUALIB_API int luaopen_package (lua_State *L) {

int i;

/* create new type _LOADLIB */

luaL_newmetatable(L, "_LOADLIB");

lua_pushcfunction(L, gctm);

lua_setfield(L, -2, "__gc");

/* create `package' table */

luaL_register(L, LUA_LOADLIBNAME, pk_funcs);

#if defined(LUA_COMPAT_LOADLIB)

lua_getfield(L, -1, "loadlib");

lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");

#endif

lua_pushvalue(L, -1);

lua_replace(L, LUA_ENVIRONINDEX);

/* create `loaders' table */

lua_createtable(L, sizeof(loaders)/sizeof(loaders[0]) - 1, 0);

/* fill it with pre-defined loaders */

for (i=0; loaders[i] != NULL; i++) {

lua_pushcfunction(L, loaders[i]);

lua_rawseti(L, -2, i+1);

}

lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */

setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */

setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */

/* store config information */

lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"

LUA_EXECDIR "\n" LUA_IGMARK);

lua_setfield(L, -2, "config");

/* set field `loaded' */

luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);

lua_setfield(L, -2, "loaded");

/* set field `preload' */

lua_newtable(L);

lua_setfield(L, -2, "preload");

lua_pushvalue(L, LUA_GLOBALSINDEX);

luaL_register(L, NULL, ll_funcs); /* open lib into global table */

lua_pop(L, 1);

return 1; /* return 'package' table */

}

lua/src/loadlib_rel.c at lua-5.1 · git99969/lua · GitHub

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