forked from mia/Aegisub
603 lines
18 KiB
C
603 lines
18 KiB
C
/*
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** Package library.
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** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
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**
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** Major portions taken verbatim or adapted from the Lua interpreter.
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** Copyright (C) 1994-2012 Lua.org, PUC-Rio. See Copyright Notice in lua.h
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*/
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#define lib_package_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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#include "lj_obj.h"
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#include "lj_err.h"
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#include "lj_lib.h"
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/* ------------------------------------------------------------------------ */
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/* Error codes for ll_loadfunc. */
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#define PACKAGE_ERR_LIB 1
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#define PACKAGE_ERR_FUNC 2
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#define PACKAGE_ERR_LOAD 3
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/* Redefined in platform specific part. */
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#define PACKAGE_LIB_FAIL "open"
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#define setprogdir(L) ((void)0)
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/* Symbol name prefixes. */
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#define SYMPREFIX_CF "luaopen_%s"
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#define SYMPREFIX_BC "luaJIT_BC_%s"
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#if LJ_TARGET_DLOPEN
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#include <dlfcn.h>
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static void ll_unloadlib(void *lib)
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{
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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 gl)
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{
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void *lib = dlopen(path, RTLD_NOW | (gl ? 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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{
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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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static const char *ll_bcsym(void *lib, const char *sym)
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{
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#if defined(RTLD_DEFAULT)
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if (lib == NULL) lib = RTLD_DEFAULT;
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#elif LJ_TARGET_OSX || LJ_TARGET_BSD
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if (lib == NULL) lib = (void *)(intptr_t)-2;
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#endif
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return (const char *)dlsym(lib, sym);
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}
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#elif LJ_TARGET_WINDOWS
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#ifndef GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
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#define GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS 4
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#define GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT 2
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BOOL WINAPI GetModuleHandleExA(DWORD, LPCSTR, HMODULE*);
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#endif
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#undef setprogdir
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static void setprogdir(lua_State *L)
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{
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char buff[MAX_PATH + 1];
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char *lb;
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DWORD nsize = sizeof(buff);
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DWORD n = GetModuleFileNameA(NULL, buff, nsize);
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if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) {
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luaL_error(L, "unable to get ModuleFileName");
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} else {
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*lb = '\0';
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luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
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lua_remove(L, -2); /* remove original string */
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}
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}
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static void pusherror(lua_State *L)
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{
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DWORD error = GetLastError();
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char buffer[128];
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if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, error, 0, buffer, sizeof(buffer), NULL))
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lua_pushstring(L, buffer);
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else
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lua_pushfstring(L, "system error %d\n", error);
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}
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static void ll_unloadlib(void *lib)
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{
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FreeLibrary((HINSTANCE)lib);
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}
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static void *ll_load(lua_State *L, const char *path, int gl)
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{
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HINSTANCE lib = LoadLibraryA(path);
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if (lib == NULL) pusherror(L);
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UNUSED(gl);
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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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{
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lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
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if (f == NULL) pusherror(L);
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return f;
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}
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static const char *ll_bcsym(void *lib, const char *sym)
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{
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if (lib) {
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return (const char *)GetProcAddress((HINSTANCE)lib, sym);
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} else {
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HINSTANCE h = GetModuleHandleA(NULL);
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const char *p = (const char *)GetProcAddress(h, sym);
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if (p == NULL && GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS|GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
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(const char *)ll_bcsym, &h))
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p = (const char *)GetProcAddress(h, sym);
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return p;
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}
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}
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#else
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#undef PACKAGE_LIB_FAIL
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#define PACKAGE_LIB_FAIL "absent"
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#define DLMSG "dynamic libraries not enabled; no support for target OS"
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static void ll_unloadlib(void *lib)
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{
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UNUSED(lib);
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}
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static void *ll_load(lua_State *L, const char *path, int gl)
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{
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UNUSED(path); UNUSED(gl);
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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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{
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UNUSED(lib); UNUSED(sym);
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lua_pushliteral(L, DLMSG);
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return NULL;
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}
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static const char *ll_bcsym(void *lib, const char *sym)
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{
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UNUSED(lib); UNUSED(sym);
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return NULL;
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}
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#endif
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/* ------------------------------------------------------------------------ */
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static void **ll_register(lua_State *L, const char *path)
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{
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void **plib;
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lua_pushfstring(L, "LOADLIB: %s", path);
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lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */
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if (!lua_isnil(L, -1)) { /* is there an entry? */
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plib = (void **)lua_touserdata(L, -1);
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} else { /* no entry yet; create one */
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lua_pop(L, 1);
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plib = (void **)lua_newuserdata(L, sizeof(void *));
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*plib = NULL;
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luaL_getmetatable(L, "_LOADLIB");
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lua_setmetatable(L, -2);
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lua_pushfstring(L, "LOADLIB: %s", 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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static const char *mksymname(lua_State *L, const char *modname,
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const char *prefix)
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{
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const char *funcname;
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const char *mark = strchr(modname, *LUA_IGMARK);
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if (mark) modname = mark + 1;
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funcname = luaL_gsub(L, modname, ".", "_");
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funcname = lua_pushfstring(L, prefix, funcname);
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lua_remove(L, -2); /* remove 'gsub' result */
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return funcname;
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}
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static int ll_loadfunc(lua_State *L, const char *path, const char *name, int r)
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{
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void **reg = ll_register(L, path);
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if (*reg == NULL) *reg = ll_load(L, path, (*name == '*'));
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if (*reg == NULL) {
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return PACKAGE_ERR_LIB; /* Unable to load library. */
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} else if (*name == '*') { /* Only load library into global namespace. */
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lua_pushboolean(L, 1);
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return 0;
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} else {
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const char *sym = r ? name : mksymname(L, name, SYMPREFIX_CF);
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lua_CFunction f = ll_sym(L, *reg, sym);
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if (f) {
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lua_pushcfunction(L, f);
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return 0;
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}
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if (!r) {
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const char *bcdata = ll_bcsym(*reg, mksymname(L, name, SYMPREFIX_BC));
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lua_pop(L, 1);
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if (bcdata) {
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if (luaL_loadbuffer(L, bcdata, ~(size_t)0, name) != 0)
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return PACKAGE_ERR_LOAD;
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return 0;
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}
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}
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return PACKAGE_ERR_FUNC; /* Unable to find function. */
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}
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}
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static int lj_cf_package_loadlib(lua_State *L)
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{
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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 st = ll_loadfunc(L, path, init, 1);
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if (st == 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, (st == PACKAGE_ERR_LIB) ? PACKAGE_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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static int lj_cf_package_unloadlib(lua_State *L)
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{
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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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/* ------------------------------------------------------------------------ */
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static int readable(const char *filename)
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{
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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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{
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const char *l;
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while (*path == *LUA_PATHSEP) path++; /* skip separators */
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if (*path == '\0') return NULL; /* no more templates */
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l = strchr(path, *LUA_PATHSEP); /* find next separator */
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if (l == NULL) l = path + strlen(path);
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lua_pushlstring(L, path, (size_t)(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, const char *sep,
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const char *dirsep)
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{
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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 lj_cf_package_searchpath(lua_State *L)
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{
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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) {
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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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{
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const char *path;
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lua_getfield(L, LUA_ENVIRONINDEX, pname);
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path = lua_tostring(L, -1);
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if (path == NULL)
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luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
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return searchpath(L, name, path, ".", LUA_DIRSEP);
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}
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static void loaderror(lua_State *L, const char *filename)
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{
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luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
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lua_tostring(L, 1), filename, lua_tostring(L, -1));
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}
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static int lj_cf_package_loader_lua(lua_State *L)
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{
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const char *filename;
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const char *name = luaL_checkstring(L, 1);
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filename = findfile(L, name, "path");
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if (filename == NULL) return 1; /* library not found in this path */
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if (luaL_loadfile(L, filename) != 0)
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loaderror(L, filename);
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return 1; /* library loaded successfully */
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}
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static int lj_cf_package_loader_c(lua_State *L)
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{
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const char *name = luaL_checkstring(L, 1);
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const char *filename = findfile(L, name, "cpath");
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if (filename == NULL) return 1; /* library not found in this path */
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if (ll_loadfunc(L, filename, name, 0) != 0)
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loaderror(L, filename);
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return 1; /* library loaded successfully */
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}
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static int lj_cf_package_loader_croot(lua_State *L)
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{
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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 st;
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if (p == NULL) return 0; /* is root */
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lua_pushlstring(L, name, (size_t)(p - name));
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filename = findfile(L, lua_tostring(L, -1), "cpath");
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if (filename == NULL) return 1; /* root not found */
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if ((st = ll_loadfunc(L, filename, name, 0)) != 0) {
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if (st != PACKAGE_ERR_FUNC) loaderror(L, filename); /* real error */
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lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
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name, filename);
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return 1; /* function not found */
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}
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return 1;
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}
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static int lj_cf_package_loader_preload(lua_State *L)
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{
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const char *name = luaL_checkstring(L, 1);
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lua_getfield(L, LUA_ENVIRONINDEX, "preload");
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if (!lua_istable(L, -1))
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luaL_error(L, LUA_QL("package.preload") " must be a table");
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lua_getfield(L, -1, name);
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if (lua_isnil(L, -1)) { /* Not found? */
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const char *bcname = mksymname(L, name, SYMPREFIX_BC);
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const char *bcdata = ll_bcsym(NULL, bcname);
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if (bcdata == NULL || luaL_loadbuffer(L, bcdata, ~(size_t)0, name) != 0)
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lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
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}
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return 1;
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}
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/* ------------------------------------------------------------------------ */
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static const int sentinel_ = 0;
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#define sentinel ((void *)&sentinel_)
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static int lj_cf_package_require(lua_State *L)
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{
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const char *name = luaL_checkstring(L, 1);
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int i;
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lua_settop(L, 1); /* _LOADED table will be at index 2 */
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lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
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lua_getfield(L, 2, name);
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if (lua_toboolean(L, -1)) { /* is it there? */
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if (lua_touserdata(L, -1) == sentinel) /* check loops */
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luaL_error(L, "loop or previous error loading module " LUA_QS, name);
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return 1; /* package is already loaded */
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}
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/* else must load it; iterate over available loaders */
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lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
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if (!lua_istable(L, -1))
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luaL_error(L, LUA_QL("package.loaders") " must be a table");
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lua_pushliteral(L, ""); /* error message accumulator */
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for (i = 1; ; i++) {
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lua_rawgeti(L, -2, i); /* get a loader */
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if (lua_isnil(L, -1))
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luaL_error(L, "module " LUA_QS " not found:%s",
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name, lua_tostring(L, -2));
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lua_pushstring(L, name);
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lua_call(L, 1, 1); /* call it */
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if (lua_isfunction(L, -1)) /* did it find module? */
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break; /* module loaded successfully */
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else if (lua_isstring(L, -1)) /* loader returned error message? */
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lua_concat(L, 2); /* accumulate it */
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else
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lua_pop(L, 1);
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}
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lua_pushlightuserdata(L, sentinel);
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lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
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lua_pushstring(L, name); /* pass name as argument to module */
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lua_call(L, 1, 1); /* run loaded module */
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if (!lua_isnil(L, -1)) /* non-nil return? */
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lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
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lua_getfield(L, 2, name);
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if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
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lua_pushboolean(L, 1); /* use true as result */
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lua_pushvalue(L, -1); /* extra copy to be returned */
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lua_setfield(L, 2, name); /* _LOADED[name] = true */
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}
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lj_lib_checkfpu(L);
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return 1;
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}
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/* ------------------------------------------------------------------------ */
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static void setfenv(lua_State *L)
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{
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lua_Debug ar;
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if (lua_getstack(L, 1, &ar) == 0 ||
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lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
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lua_iscfunction(L, -1))
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luaL_error(L, LUA_QL("module") " not called from a Lua function");
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lua_pushvalue(L, -2);
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lua_setfenv(L, -2);
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lua_pop(L, 1);
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}
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static void dooptions(lua_State *L, int n)
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{
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int i;
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for (i = 2; i <= n; i++) {
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lua_pushvalue(L, i); /* get option (a function) */
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lua_pushvalue(L, -2); /* module */
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lua_call(L, 1, 0);
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}
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}
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static void modinit(lua_State *L, const char *modname)
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{
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const char *dot;
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lua_pushvalue(L, -1);
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lua_setfield(L, -2, "_M"); /* module._M = module */
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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, (size_t)(dot - modname));
|
|
lua_setfield(L, -2, "_PACKAGE");
|
|
}
|
|
|
|
static int lj_cf_package_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)
|
|
lj_err_callerv(L, LJ_ERR_BADMODN, 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 lj_cf_package_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;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
#define AUXMARK "\1"
|
|
|
|
static void setpath(lua_State *L, const char *fieldname, const char *envname,
|
|
const char *def, int noenv)
|
|
{
|
|
#if LJ_TARGET_CONSOLE
|
|
const char *path = NULL;
|
|
UNUSED(envname);
|
|
#else
|
|
const char *path = getenv(envname);
|
|
#endif
|
|
if (path == NULL || noenv) {
|
|
lua_pushstring(L, def);
|
|
} else {
|
|
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 package_lib[] = {
|
|
{ "loadlib", lj_cf_package_loadlib },
|
|
{ "searchpath", lj_cf_package_searchpath },
|
|
{ "seeall", lj_cf_package_seeall },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static const luaL_Reg package_global[] = {
|
|
{ "module", lj_cf_package_module },
|
|
{ "require", lj_cf_package_require },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static const lua_CFunction package_loaders[] =
|
|
{
|
|
lj_cf_package_loader_preload,
|
|
lj_cf_package_loader_lua,
|
|
lj_cf_package_loader_c,
|
|
lj_cf_package_loader_croot,
|
|
NULL
|
|
};
|
|
|
|
LUALIB_API int luaopen_package(lua_State *L)
|
|
{
|
|
int i;
|
|
int noenv;
|
|
luaL_newmetatable(L, "_LOADLIB");
|
|
lj_lib_pushcf(L, lj_cf_package_unloadlib, 1);
|
|
lua_setfield(L, -2, "__gc");
|
|
luaL_register(L, LUA_LOADLIBNAME, package_lib);
|
|
lua_pushvalue(L, -1);
|
|
lua_replace(L, LUA_ENVIRONINDEX);
|
|
lua_createtable(L, sizeof(package_loaders)/sizeof(package_loaders[0])-1, 0);
|
|
for (i = 0; package_loaders[i] != NULL; i++) {
|
|
lj_lib_pushcf(L, package_loaders[i], 1);
|
|
lua_rawseti(L, -2, i+1);
|
|
}
|
|
lua_setfield(L, -2, "loaders");
|
|
lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
|
noenv = lua_toboolean(L, -1);
|
|
lua_pop(L, 1);
|
|
setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT, noenv);
|
|
setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT, noenv);
|
|
lua_pushliteral(L, LUA_PATH_CONFIG);
|
|
lua_setfield(L, -2, "config");
|
|
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
|
|
lua_setfield(L, -2, "loaded");
|
|
luaL_findtable(L, LUA_REGISTRYINDEX, "_PRELOAD", 4);
|
|
lua_setfield(L, -2, "preload");
|
|
lua_pushvalue(L, LUA_GLOBALSINDEX);
|
|
luaL_register(L, NULL, package_global);
|
|
lua_pop(L, 1);
|
|
return 1;
|
|
}
|
|
|