/* Module definition and import implementation */ #include "Python.h" #include "node.h" #include "token.h" #include "errcode.h" #include "marshal.h" #include "compile.h" #include "eval.h" #include "osdefs.h" #include "importdl.h" #ifdef macintosh #include "macglue.h" #endif #ifdef HAVE_FCNTL_H #include #endif extern time_t PyOS_GetLastModificationTime(char *, FILE *); /* In getmtime.c */ /* Magic word to reject .pyc files generated by other Python versions */ /* Change for each incompatible change */ /* The value of CR and LF is incorporated so if you ever read or write a .pyc file in text mode the magic number will be wrong; also, the Apple MPW compiler swaps their values, botching string constants. XXX That probably isn't important anymore. */ /* XXX Perhaps the magic number should be frozen and a version field added to the .pyc file header? */ /* New way to come up with the low 16 bits of the magic number: (YEAR-1995) * 10000 + MONTH * 100 + DAY where MONTH and DAY are 1-based. XXX Whatever the "old way" may have been isn't documented. XXX This scheme breaks in 2002, as (2002-1995)*10000 = 70000 doesn't fit in 16 bits. XXX Later, sometimes 1 gets added to MAGIC in order to record that the Unicode -U option is in use. IMO (Tim's), that's a Bad Idea (quite apart from that the -U option doesn't work so isn't used anyway). XXX MAL, 2002-02-07: I had to modify the MAGIC due to a fix of the UTF-8 encoder (it previously produced invalid UTF-8 for unpaired high surrogates), so I simply bumped the month value to 20 (invalid month) and set the day to 1. This should be recognizable by any algorithm relying on the above scheme. Perhaps we should simply start counting in increments of 10 from now on ?! MWH, 2002-08-03: Removed SET_LINENO. Couldn't be bothered figuring out the MAGIC schemes, so just incremented it by 10. GvR, 2002-08-31: Because MWH changed the bytecode again, moved the magic number *back* to 62011. This should get the snake-farm to throw away its old .pyc files, amongst others. Known values: Python 1.5: 20121 Python 1.5.1: 20121 Python 1.5.2: 20121 Python 2.0: 50823 Python 2.0.1: 50823 Python 2.1: 60202 Python 2.1.1: 60202 Python 2.1.2: 60202 Python 2.2: 60717 Python 2.3a0: 62011 Python 2.3a0: 62021 Python 2.3a0: 62011 (!) */ #define MAGIC (62011 | ((long)'\r'<<16) | ((long)'\n'<<24)) /* Magic word as global; note that _PyImport_Init() can change the value of this global to accommodate for alterations of how the compiler works which are enabled by command line switches. */ static long pyc_magic = MAGIC; /* See _PyImport_FixupExtension() below */ static PyObject *extensions = NULL; /* This table is defined in config.c: */ extern struct _inittab _PyImport_Inittab[]; struct _inittab *PyImport_Inittab = _PyImport_Inittab; /* these tables define the module suffixes that Python recognizes */ struct filedescr * _PyImport_Filetab = NULL; #ifdef RISCOS static const struct filedescr _PyImport_StandardFiletab[] = { {"/py", "U", PY_SOURCE}, {"/pyc", "rb", PY_COMPILED}, {0, 0} }; #else static const struct filedescr _PyImport_StandardFiletab[] = { {".py", "U", PY_SOURCE}, #ifdef MS_WINDOWS {".pyw", "U", PY_SOURCE}, #endif {".pyc", "rb", PY_COMPILED}, {0, 0} }; #endif /* Initialize things */ void _PyImport_Init(void) { const struct filedescr *scan; struct filedescr *filetab; int countD = 0; int countS = 0; /* prepare _PyImport_Filetab: copy entries from _PyImport_DynLoadFiletab and _PyImport_StandardFiletab. */ for (scan = _PyImport_DynLoadFiletab; scan->suffix != NULL; ++scan) ++countD; for (scan = _PyImport_StandardFiletab; scan->suffix != NULL; ++scan) ++countS; filetab = PyMem_NEW(struct filedescr, countD + countS + 1); memcpy(filetab, _PyImport_DynLoadFiletab, countD * sizeof(struct filedescr)); memcpy(filetab + countD, _PyImport_StandardFiletab, countS * sizeof(struct filedescr)); filetab[countD + countS].suffix = NULL; _PyImport_Filetab = filetab; if (Py_OptimizeFlag) { /* Replace ".pyc" with ".pyo" in _PyImport_Filetab */ for (; filetab->suffix != NULL; filetab++) { #ifndef RISCOS if (strcmp(filetab->suffix, ".pyc") == 0) filetab->suffix = ".pyo"; #else if (strcmp(filetab->suffix, "/pyc") == 0) filetab->suffix = "/pyo"; #endif } } if (Py_UnicodeFlag) { /* Fix the pyc_magic so that byte compiled code created using the all-Unicode method doesn't interfere with code created in normal operation mode. */ pyc_magic = MAGIC + 1; } } void _PyImport_Fini(void) { Py_XDECREF(extensions); extensions = NULL; PyMem_DEL(_PyImport_Filetab); _PyImport_Filetab = NULL; } /* Locking primitives to prevent parallel imports of the same module in different threads to return with a partially loaded module. These calls are serialized by the global interpreter lock. */ #ifdef WITH_THREAD #include "pythread.h" static PyThread_type_lock import_lock = 0; static long import_lock_thread = -1; static int import_lock_level = 0; static void lock_import(void) { long me = PyThread_get_thread_ident(); if (me == -1) return; /* Too bad */ if (import_lock == NULL) import_lock = PyThread_allocate_lock(); if (import_lock_thread == me) { import_lock_level++; return; } if (import_lock_thread != -1 || !PyThread_acquire_lock(import_lock, 0)) { PyThreadState *tstate = PyEval_SaveThread(); PyThread_acquire_lock(import_lock, 1); PyEval_RestoreThread(tstate); } import_lock_thread = me; import_lock_level = 1; } static void unlock_import(void) { long me = PyThread_get_thread_ident(); if (me == -1) return; /* Too bad */ if (import_lock_thread != me) Py_FatalError("unlock_import: not holding the import lock"); import_lock_level--; if (import_lock_level == 0) { import_lock_thread = -1; PyThread_release_lock(import_lock); } } #else #define lock_import() #define unlock_import() #endif static PyObject * imp_lock_held(PyObject *self, PyObject *args) { if (!PyArg_ParseTuple(args, ":lock_held")) return NULL; #ifdef WITH_THREAD return PyBool_FromLong(import_lock_thread != -1); #else return PyBool_FromLong(0); #endif } /* Helper for sys */ PyObject * PyImport_GetModuleDict(void) { PyInterpreterState *interp = PyThreadState_Get()->interp; if (interp->modules == NULL) Py_FatalError("PyImport_GetModuleDict: no module dictionary!"); return interp->modules; } /* List of names to clear in sys */ static char* sys_deletes[] = { "path", "argv", "ps1", "ps2", "exitfunc", "exc_type", "exc_value", "exc_traceback", "last_type", "last_value", "last_traceback", NULL }; static char* sys_files[] = { "stdin", "__stdin__", "stdout", "__stdout__", "stderr", "__stderr__", NULL }; /* Un-initialize things, as good as we can */ void PyImport_Cleanup(void) { int pos, ndone; char *name; PyObject *key, *value, *dict; PyInterpreterState *interp = PyThreadState_Get()->interp; PyObject *modules = interp->modules; if (modules == NULL) return; /* Already done */ /* Delete some special variables first. These are common places where user values hide and people complain when their destructors fail. Since the modules containing them are deleted *last* of all, they would come too late in the normal destruction order. Sigh. */ value = PyDict_GetItemString(modules, "__builtin__"); if (value != NULL && PyModule_Check(value)) { dict = PyModule_GetDict(value); if (Py_VerboseFlag) PySys_WriteStderr("# clear __builtin__._\n"); PyDict_SetItemString(dict, "_", Py_None); } value = PyDict_GetItemString(modules, "sys"); if (value != NULL && PyModule_Check(value)) { char **p; PyObject *v; dict = PyModule_GetDict(value); for (p = sys_deletes; *p != NULL; p++) { if (Py_VerboseFlag) PySys_WriteStderr("# clear sys.%s\n", *p); PyDict_SetItemString(dict, *p, Py_None); } for (p = sys_files; *p != NULL; p+=2) { if (Py_VerboseFlag) PySys_WriteStderr("# restore sys.%s\n", *p); v = PyDict_GetItemString(dict, *(p+1)); if (v == NULL) v = Py_None; PyDict_SetItemString(dict, *p, v); } } /* First, delete __main__ */ value = PyDict_GetItemString(modules, "__main__"); if (value != NULL && PyModule_Check(value)) { if (Py_VerboseFlag) PySys_WriteStderr("# cleanup __main__\n"); _PyModule_Clear(value); PyDict_SetItemString(modules, "__main__", Py_None); } /* The special treatment of __builtin__ here is because even when it's not referenced as a module, its dictionary is referenced by almost every module's __builtins__. Since deleting a module clears its dictionary (even if there are references left to it), we need to delete the __builtin__ module last. Likewise, we don't delete sys until the very end because it is implicitly referenced (e.g. by print). Also note that we 'delete' modules by replacing their entry in the modules dict with None, rather than really deleting them; this avoids a rehash of the modules dictionary and also marks them as "non existent" so they won't be re-imported. */ /* Next, repeatedly delete modules with a reference count of one (skipping __builtin__ and sys) and delete them */ do { ndone = 0; pos = 0; while (PyDict_Next(modules, &pos, &key, &value)) { if (value->ob_refcnt != 1) continue; if (PyString_Check(key) && PyModule_Check(value)) { name = PyString_AS_STRING(key); if (strcmp(name, "__builtin__") == 0) continue; if (strcmp(name, "sys") == 0) continue; if (Py_VerboseFlag) PySys_WriteStderr( "# cleanup[1] %s\n", name); _PyModule_Clear(value); PyDict_SetItem(modules, key, Py_None); ndone++; } } } while (ndone > 0); /* Next, delete all modules (still skipping __builtin__ and sys) */ pos = 0; while (PyDict_Next(modules, &pos, &key, &value)) { if (PyString_Check(key) && PyModule_Check(value)) { name = PyString_AS_STRING(key); if (strcmp(name, "__builtin__") == 0) continue; if (strcmp(name, "sys") == 0) continue; if (Py_VerboseFlag) PySys_WriteStderr("# cleanup[2] %s\n", name); _PyModule_Clear(value); PyDict_SetItem(modules, key, Py_None); } } /* Next, delete sys and __builtin__ (in that order) */ value = PyDict_GetItemString(modules, "sys"); if (value != NULL && PyModule_Check(value)) { if (Py_VerboseFlag) PySys_WriteStderr("# cleanup sys\n"); _PyModule_Clear(value); PyDict_SetItemString(modules, "sys", Py_None); } value = PyDict_GetItemString(modules, "__builtin__"); if (value != NULL && PyModule_Check(value)) { if (Py_VerboseFlag) PySys_WriteStderr("# cleanup __builtin__\n"); _PyModule_Clear(value); PyDict_SetItemString(modules, "__builtin__", Py_None); } /* Finally, clear and delete the modules directory */ PyDict_Clear(modules); interp->modules = NULL; Py_DECREF(modules); } /* Helper for pythonrun.c -- return magic number */ long PyImport_GetMagicNumber(void) { return pyc_magic; } /* Magic for extension modules (built-in as well as dynamically loaded). To prevent initializing an extension module more than once, we keep a static dictionary 'extensions' keyed by module name (for built-in modules) or by filename (for dynamically loaded modules), containing these modules. A copy of the module's dictionary is stored by calling _PyImport_FixupExtension() immediately after the module initialization function succeeds. A copy can be retrieved from there by calling _PyImport_FindExtension(). */ PyObject * _PyImport_FixupExtension(char *name, char *filename) { PyObject *modules, *mod, *dict, *copy; if (extensions == NULL) { extensions = PyDict_New(); if (extensions == NULL) return NULL; } modules = PyImport_GetModuleDict(); mod = PyDict_GetItemString(modules, name); if (mod == NULL || !PyModule_Check(mod)) { PyErr_Format(PyExc_SystemError, "_PyImport_FixupExtension: module %.200s not loaded", name); return NULL; } dict = PyModule_GetDict(mod); if (dict == NULL) return NULL; copy = PyDict_Copy(dict); if (copy == NULL) return NULL; PyDict_SetItemString(extensions, filename, copy); Py_DECREF(copy); return copy; } PyObject * _PyImport_FindExtension(char *name, char *filename) { PyObject *dict, *mod, *mdict; if (extensions == NULL) return NULL; dict = PyDict_GetItemString(extensions, filename); if (dict == NULL) return NULL; mod = PyImport_AddModule(name); if (mod == NULL) return NULL; mdict = PyModule_GetDict(mod); if (mdict == NULL) return NULL; if (PyDict_Update(mdict, dict)) return NULL; if (Py_VerboseFlag) PySys_WriteStderr("import %s # previously loaded (%s)\n", name, filename); return mod; } /* Get the module object corresponding to a module name. First check the modules dictionary if there's one there, if not, create a new one and insert in in the modules dictionary. Because the former action is most common, THIS DOES NOT RETURN A 'NEW' REFERENCE! */ PyObject * PyImport_AddModule(char *name) { PyObject *modules = PyImport_GetModuleDict(); PyObject *m; if ((m = PyDict_GetItemString(modules, name)) != NULL && PyModule_Check(m)) return m; m = PyModule_New(name); if (m == NULL) return NULL; if (PyDict_SetItemString(modules, name, m) != 0) { Py_DECREF(m); return NULL; } Py_DECREF(m); /* Yes, it still exists, in modules! */ return m; } /* Execute a code object in a module and return the module object WITH INCREMENTED REFERENCE COUNT */ PyObject * PyImport_ExecCodeModule(char *name, PyObject *co) { return PyImport_ExecCodeModuleEx(name, co, (char *)NULL); } PyObject * PyImport_ExecCodeModuleEx(char *name, PyObject *co, char *pathname) { PyObject *modules = PyImport_GetModuleDict(); PyObject *m, *d, *v; m = PyImport_AddModule(name); if (m == NULL) return NULL; d = PyModule_GetDict(m); if (PyDict_GetItemString(d, "__builtins__") == NULL) { if (PyDict_SetItemString(d, "__builtins__", PyEval_GetBuiltins()) != 0) return NULL; } /* Remember the filename as the __file__ attribute */ v = NULL; if (pathname != NULL) { v = PyString_FromString(pathname); if (v == NULL) PyErr_Clear(); } if (v == NULL) { v = ((PyCodeObject *)co)->co_filename; Py_INCREF(v); } if (PyDict_SetItemString(d, "__file__", v) != 0) PyErr_Clear(); /* Not important enough to report */ Py_DECREF(v); v = PyEval_EvalCode((PyCodeObject *)co, d, d); if (v == NULL) return NULL; Py_DECREF(v); if ((m = PyDict_GetItemString(modules, name)) == NULL) { PyErr_Format(PyExc_ImportError, "Loaded module %.200s not found in sys.modules", name); return NULL; } Py_INCREF(m); return m; } /* Given a pathname for a Python source file, fill a buffer with the pathname for the corresponding compiled file. Return the pathname for the compiled file, or NULL if there's no space in the buffer. Doesn't set an exception. */ static char * make_compiled_pathname(char *pathname, char *buf, size_t buflen) { size_t len = strlen(pathname); if (len+2 > buflen) return NULL; #ifdef MS_WINDOWS /* Treat .pyw as if it were .py. The case of ".pyw" must match that used in _PyImport_StandardFiletab. */ if (len >= 4 && strcmp(&pathname[len-4], ".pyw") == 0) --len; /* pretend 'w' isn't there */ #endif memcpy(buf, pathname, len); buf[len] = Py_OptimizeFlag ? 'o' : 'c'; buf[len+1] = '\0'; return buf; } /* Given a pathname for a Python source file, its time of last modification, and a pathname for a compiled file, check whether the compiled file represents the same version of the source. If so, return a FILE pointer for the compiled file, positioned just after the header; if not, return NULL. Doesn't set an exception. */ static FILE * check_compiled_module(char *pathname, long mtime, char *cpathname) { FILE *fp; long magic; long pyc_mtime; fp = fopen(cpathname, "rb"); if (fp == NULL) return NULL; magic = PyMarshal_ReadLongFromFile(fp); if (magic != pyc_magic) { if (Py_VerboseFlag) PySys_WriteStderr("# %s has bad magic\n", cpathname); fclose(fp); return NULL; } pyc_mtime = PyMarshal_ReadLongFromFile(fp); if (pyc_mtime != mtime) { if (Py_VerboseFlag) PySys_WriteStderr("# %s has bad mtime\n", cpathname); fclose(fp); return NULL; } if (Py_VerboseFlag) PySys_WriteStderr("# %s matches %s\n", cpathname, pathname); return fp; } /* Read a code object from a file and check it for validity */ static PyCodeObject * read_compiled_module(char *cpathname, FILE *fp) { PyObject *co; co = PyMarshal_ReadLastObjectFromFile(fp); /* Ugly: rd_object() may return NULL with or without error */ if (co == NULL || !PyCode_Check(co)) { if (!PyErr_Occurred()) PyErr_Format(PyExc_ImportError, "Non-code object in %.200s", cpathname); Py_XDECREF(co); return NULL; } return (PyCodeObject *)co; } /* Load a module from a compiled file, execute it, and return its module object WITH INCREMENTED REFERENCE COUNT */ static PyObject * load_compiled_module(char *name, char *cpathname, FILE *fp) { long magic; PyCodeObject *co; PyObject *m; magic = PyMarshal_ReadLongFromFile(fp); if (magic != pyc_magic) { PyErr_Format(PyExc_ImportError, "Bad magic number in %.200s", cpathname); return NULL; } (void) PyMarshal_ReadLongFromFile(fp); co = read_compiled_module(cpathname, fp); if (co == NULL) return NULL; if (Py_VerboseFlag) PySys_WriteStderr("import %s # precompiled from %s\n", name, cpathname); m = PyImport_ExecCodeModuleEx(name, (PyObject *)co, cpathname); Py_DECREF(co); return m; } /* Parse a source file and return the corresponding code object */ static PyCodeObject * parse_source_module(char *pathname, FILE *fp) { PyCodeObject *co; node *n; n = PyParser_SimpleParseFile(fp, pathname, Py_file_input); if (n == NULL) return NULL; co = PyNode_Compile(n, pathname); PyNode_Free(n); return co; } /* Helper to open a bytecode file for writing in exclusive mode */ static FILE * open_exclusive(char *filename) { #if defined(O_EXCL)&&defined(O_CREAT)&&defined(O_WRONLY)&&defined(O_TRUNC) /* Use O_EXCL to avoid a race condition when another process tries to write the same file. When that happens, our open() call fails, which is just fine (since it's only a cache). XXX If the file exists and is writable but the directory is not writable, the file will never be written. Oh well. */ int fd; (void) unlink(filename); fd = open(filename, O_EXCL|O_CREAT|O_WRONLY|O_TRUNC #ifdef O_BINARY |O_BINARY /* necessary for Windows */ #endif , 0666); if (fd < 0) return NULL; return fdopen(fd, "wb"); #else /* Best we can do -- on Windows this can't happen anyway */ return fopen(filename, "wb"); #endif } /* Write a compiled module to a file, placing the time of last modification of its source into the header. Errors are ignored, if a write error occurs an attempt is made to remove the file. */ static void write_compiled_module(PyCodeObject *co, char *cpathname, long mtime) { FILE *fp; fp = open_exclusive(cpathname); if (fp == NULL) { if (Py_VerboseFlag) PySys_WriteStderr( "# can't create %s\n", cpathname); return; } PyMarshal_WriteLongToFile(pyc_magic, fp); /* First write a 0 for mtime */ PyMarshal_WriteLongToFile(0L, fp); PyMarshal_WriteObjectToFile((PyObject *)co, fp); if (ferror(fp)) { if (Py_VerboseFlag) PySys_WriteStderr("# can't write %s\n", cpathname); /* Don't keep partial file */ fclose(fp); (void) unlink(cpathname); return; } /* Now write the true mtime */ fseek(fp, 4L, 0); PyMarshal_WriteLongToFile(mtime, fp); fflush(fp); fclose(fp); if (Py_VerboseFlag) PySys_WriteStderr("# wrote %s\n", cpathname); #ifdef macintosh PyMac_setfiletype(cpathname, 'Pyth', 'PYC '); #endif } /* Load a source module from a given file and return its module object WITH INCREMENTED REFERENCE COUNT. If there's a matching byte-compiled file, use that instead. */ static PyObject * load_source_module(char *name, char *pathname, FILE *fp) { time_t mtime; FILE *fpc; char buf[MAXPATHLEN+1]; char *cpathname; PyCodeObject *co; PyObject *m; mtime = PyOS_GetLastModificationTime(pathname, fp); if (mtime == (time_t)(-1)) return NULL; #if SIZEOF_TIME_T > 4 /* Python's .pyc timestamp handling presumes that the timestamp fits in 4 bytes. This will be fine until sometime in the year 2038, when a 4-byte signed time_t will overflow. */ if (mtime >> 32) { PyErr_SetString(PyExc_OverflowError, "modification time overflows a 4 byte field"); return NULL; } #endif cpathname = make_compiled_pathname(pathname, buf, (size_t)MAXPATHLEN + 1); if (cpathname != NULL && (fpc = check_compiled_module(pathname, mtime, cpathname))) { co = read_compiled_module(cpathname, fpc); fclose(fpc); if (co == NULL) return NULL; if (Py_VerboseFlag) PySys_WriteStderr("import %s # precompiled from %s\n", name, cpathname); pathname = cpathname; } else { co = parse_source_module(pathname, fp); if (co == NULL) return NULL; if (Py_VerboseFlag) PySys_WriteStderr("import %s # from %s\n", name, pathname); write_compiled_module(co, cpathname, mtime); } m = PyImport_ExecCodeModuleEx(name, (PyObject *)co, pathname); Py_DECREF(co); return m; } /* Forward */ static PyObject *load_module(char *, FILE *, char *, int); static struct filedescr *find_module(char *, PyObject *, char *, size_t, FILE **); static struct _frozen *find_frozen(char *name); /* Load a package and return its module object WITH INCREMENTED REFERENCE COUNT */ static PyObject * load_package(char *name, char *pathname) { PyObject *m, *d, *file, *path; int err; char buf[MAXPATHLEN+1]; FILE *fp = NULL; struct filedescr *fdp; m = PyImport_AddModule(name); if (m == NULL) return NULL; if (Py_VerboseFlag) PySys_WriteStderr("import %s # directory %s\n", name, pathname); d = PyModule_GetDict(m); file = PyString_FromString(pathname); if (file == NULL) return NULL; path = Py_BuildValue("[O]", file); if (path == NULL) { Py_DECREF(file); return NULL; } err = PyDict_SetItemString(d, "__file__", file); if (err == 0) err = PyDict_SetItemString(d, "__path__", path); if (err != 0) { m = NULL; goto cleanup; } buf[0] = '\0'; fdp = find_module("__init__", path, buf, sizeof(buf), &fp); if (fdp == NULL) { if (PyErr_ExceptionMatches(PyExc_ImportError)) { PyErr_Clear(); } else m = NULL; goto cleanup; } m = load_module(name, fp, buf, fdp->type); if (fp != NULL) fclose(fp); cleanup: Py_XDECREF(path); Py_XDECREF(file); return m; } /* Helper to test for built-in module */ static int is_builtin(char *name) { int i; for (i = 0; PyImport_Inittab[i].name != NULL; i++) { if (strcmp(name, PyImport_Inittab[i].name) == 0) { if (PyImport_Inittab[i].initfunc == NULL) return -1; else return 1; } } return 0; } /* Search the path (default sys.path) for a module. Return the corresponding filedescr struct, and (via return arguments) the pathname and an open file. Return NULL if the module is not found. */ #ifdef MS_COREDLL extern FILE *PyWin_FindRegisteredModule(const char *, struct filedescr **, char *, int); #endif static int case_ok(char *, int, int, char *); static int find_init_module(char *); /* Forward */ static struct filedescr * find_module(char *realname, PyObject *path, char *buf, size_t buflen, FILE **p_fp) { int i, npath; size_t len, namelen; struct filedescr *fdp = NULL; char *filemode; FILE *fp = NULL; #ifndef RISCOS struct stat statbuf; #endif static struct filedescr fd_frozen = {"", "", PY_FROZEN}; static struct filedescr fd_builtin = {"", "", C_BUILTIN}; static struct filedescr fd_package = {"", "", PKG_DIRECTORY}; char name[MAXPATHLEN+1]; #if defined(PYOS_OS2) size_t saved_len; size_t saved_namelen; char *saved_buf = NULL; #endif if (strlen(realname) > MAXPATHLEN) { PyErr_SetString(PyExc_OverflowError, "module name is too long"); return NULL; } strcpy(name, realname); if (path != NULL && PyString_Check(path)) { /* The only type of submodule allowed inside a "frozen" package are other frozen modules or packages. */ if (PyString_Size(path) + 1 + strlen(name) >= (size_t)buflen) { PyErr_SetString(PyExc_ImportError, "full frozen module name too long"); return NULL; } strcpy(buf, PyString_AsString(path)); strcat(buf, "."); strcat(buf, name); strcpy(name, buf); #ifdef macintosh /* Freezing on the mac works different, and the modules are ** actually on sys.path. So we don't take the quick exit but ** continue with the normal flow. */ path = NULL; #else if (find_frozen(name) != NULL) { strcpy(buf, name); return &fd_frozen; } PyErr_Format(PyExc_ImportError, "No frozen submodule named %.200s", name); return NULL; #endif } if (path == NULL) { if (is_builtin(name)) { strcpy(buf, name); return &fd_builtin; } if ((find_frozen(name)) != NULL) { strcpy(buf, name); return &fd_frozen; } #ifdef MS_COREDLL fp = PyWin_FindRegisteredModule(name, &fdp, buf, buflen); if (fp != NULL) { *p_fp = fp; return fdp; } #endif path = PySys_GetObject("path"); } if (path == NULL || !PyList_Check(path)) { PyErr_SetString(PyExc_ImportError, "sys.path must be a list of directory names"); return NULL; } npath = PyList_Size(path); namelen = strlen(name); for (i = 0; i < npath; i++) { PyObject *copy = NULL; PyObject *v = PyList_GetItem(path, i); #ifdef Py_USING_UNICODE if (PyUnicode_Check(v)) { copy = PyUnicode_Encode(PyUnicode_AS_UNICODE(v), PyUnicode_GET_SIZE(v), Py_FileSystemDefaultEncoding, NULL); if (copy == NULL) return NULL; v = copy; } else #endif if (!PyString_Check(v)) continue; len = PyString_Size(v); if (len + 2 + namelen + MAXSUFFIXSIZE >= buflen) { Py_XDECREF(copy); continue; /* Too long */ } strcpy(buf, PyString_AsString(v)); if (strlen(buf) != len) { Py_XDECREF(copy); continue; /* v contains '\0' */ } #ifdef macintosh /* ** Speedup: each sys.path item is interned, and ** FindResourceModule remembers which items refer to ** folders (so we don't have to bother trying to look ** into them for resources). */ PyString_InternInPlace(&PyList_GET_ITEM(path, i)); v = PyList_GET_ITEM(path, i); if (PyMac_FindResourceModule((PyStringObject *)v, name, buf)) { static struct filedescr resfiledescr = {"", "", PY_RESOURCE}; Py_XDECREF(copy); return &resfiledescr; } if (PyMac_FindCodeResourceModule((PyStringObject *)v, name, buf)) { static struct filedescr resfiledescr = {"", "", PY_CODERESOURCE}; Py_XDECREF(copy); return &resfiledescr; } #endif if (len > 0 && buf[len-1] != SEP #ifdef ALTSEP && buf[len-1] != ALTSEP #endif ) buf[len++] = SEP; strcpy(buf+len, name); len += namelen; /* Check for package import (buf holds a directory name, and there's an __init__ module in that directory */ #ifdef HAVE_STAT if (stat(buf, &statbuf) == 0 && /* it exists */ S_ISDIR(statbuf.st_mode) && /* it's a directory */ find_init_module(buf) && /* it has __init__.py */ case_ok(buf, len, namelen, name)) { /* and case matches */ Py_XDECREF(copy); return &fd_package; } #else /* XXX How are you going to test for directories? */ #ifdef RISCOS if (isdir(buf) && find_init_module(buf) && case_ok(buf, len, namelen, name)) { Py_XDECREF(copy); return &fd_package; } #endif #endif #ifdef macintosh fdp = PyMac_FindModuleExtension(buf, &len, name); if (fdp) { #else #if defined(PYOS_OS2) /* take a snapshot of the module spec for restoration * after the 8 character DLL hackery */ saved_buf = strdup(buf); saved_len = len; saved_namelen = namelen; #endif /* PYOS_OS2 */ for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) { #if defined(PYOS_OS2) /* OS/2 limits DLLs to 8 character names (w/o extension) * so if the name is longer than that and its a * dynamically loaded module we're going to try, * truncate the name before trying */ if (strlen(realname) > 8) { /* is this an attempt to load a C extension? */ const struct filedescr *scan; scan = _PyImport_DynLoadFiletab; while (scan->suffix != NULL) { if (!strcmp(scan->suffix, fdp->suffix)) break; else scan++; } if (scan->suffix != NULL) { /* yes, so truncate the name */ namelen = 8; len -= strlen(realname) - namelen; buf[len] = '\0'; } } #endif /* PYOS_OS2 */ strcpy(buf+len, fdp->suffix); if (Py_VerboseFlag > 1) PySys_WriteStderr("# trying %s\n", buf); #endif /* !macintosh */ filemode = fdp->mode; if (filemode[0] == 'U') filemode = "r" PY_STDIOTEXTMODE; fp = fopen(buf, filemode); if (fp != NULL) { if (case_ok(buf, len, namelen, name)) break; else { /* continue search */ fclose(fp); fp = NULL; } } #if defined(PYOS_OS2) /* restore the saved snapshot */ strcpy(buf, saved_buf); len = saved_len; namelen = saved_namelen; #endif } #if defined(PYOS_OS2) /* don't need/want the module name snapshot anymore */ if (saved_buf) { free(saved_buf); saved_buf = NULL; } #endif Py_XDECREF(copy); if (fp != NULL) break; } if (fp == NULL) { PyErr_Format(PyExc_ImportError, "No module named %.200s", name); return NULL; } *p_fp = fp; return fdp; } /* case_ok(char* buf, int len, int namelen, char* name) * The arguments here are tricky, best shown by example: * /a/b/c/d/e/f/g/h/i/j/k/some_long_module_name.py\0 * ^ ^ ^ ^ * |--------------------- buf ---------------------| * |------------------- len ------------------| * |------ name -------| * |----- namelen -----| * buf is the full path, but len only counts up to (& exclusive of) the * extension. name is the module name, also exclusive of extension. * * We've already done a successful stat() or fopen() on buf, so know that * there's some match, possibly case-insensitive. * * case_ok() is to return 1 if there's a case-sensitive match for * name, else 0. case_ok() is also to return 1 if envar PYTHONCASEOK * exists. * * case_ok() is used to implement case-sensitive import semantics even * on platforms with case-insensitive filesystems. It's trivial to implement * for case-sensitive filesystems. It's pretty much a cross-platform * nightmare for systems with case-insensitive filesystems. */ /* First we may need a pile of platform-specific header files; the sequence * of #if's here should match the sequence in the body of case_ok(). */ #if defined(MS_WINDOWS) || defined(__CYGWIN__) #include #ifdef __CYGWIN__ #include #endif #elif defined(DJGPP) #include #elif defined(macintosh) #include #elif defined(__MACH__) && defined(__APPLE__) && defined(HAVE_DIRENT_H) #include #include #elif defined(PYOS_OS2) #define INCL_DOS #define INCL_DOSERRORS #define INCL_NOPMAPI #include #elif defined(RISCOS) #include "oslib/osfscontrol.h" #endif static int case_ok(char *buf, int len, int namelen, char *name) { /* Pick a platform-specific implementation; the sequence of #if's here should * match the sequence just above. */ /* MS_WINDOWS || __CYGWIN__ */ #if defined(MS_WINDOWS) || defined(__CYGWIN__) WIN32_FIND_DATA data; HANDLE h; #ifdef __CYGWIN__ char tempbuf[MAX_PATH]; #endif if (Py_GETENV("PYTHONCASEOK") != NULL) return 1; #ifdef __CYGWIN__ cygwin32_conv_to_win32_path(buf, tempbuf); h = FindFirstFile(tempbuf, &data); #else h = FindFirstFile(buf, &data); #endif if (h == INVALID_HANDLE_VALUE) { PyErr_Format(PyExc_NameError, "Can't find file for module %.100s\n(filename %.300s)", name, buf); return 0; } FindClose(h); return strncmp(data.cFileName, name, namelen) == 0; /* DJGPP */ #elif defined(DJGPP) struct ffblk ffblk; int done; if (Py_GETENV("PYTHONCASEOK") != NULL) return 1; done = findfirst(buf, &ffblk, FA_ARCH|FA_RDONLY|FA_HIDDEN|FA_DIREC); if (done) { PyErr_Format(PyExc_NameError, "Can't find file for module %.100s\n(filename %.300s)", name, buf); return 0; } return strncmp(ffblk.ff_name, name, namelen) == 0; /* macintosh */ #elif defined(macintosh) FSSpec fss; OSErr err; if (Py_GETENV("PYTHONCASEOK") != NULL) return 1; err = FSMakeFSSpec(0, 0, Pstring(buf), &fss); if (err) { PyErr_Format(PyExc_NameError, "Can't find file for module %.100s\n(filename %.300s)", name, buf); return 0; } return fss.name[0] >= namelen && strncmp(name, (char *)fss.name+1, namelen) == 0; /* new-fangled macintosh (macosx) */ #elif defined(__MACH__) && defined(__APPLE__) && defined(HAVE_DIRENT_H) DIR *dirp; struct dirent *dp; char dirname[MAXPATHLEN + 1]; const int dirlen = len - namelen - 1; /* don't want trailing SEP */ if (Py_GETENV("PYTHONCASEOK") != NULL) return 1; /* Copy the dir component into dirname; substitute "." if empty */ if (dirlen <= 0) { dirname[0] = '.'; dirname[1] = '\0'; } else { assert(dirlen <= MAXPATHLEN); memcpy(dirname, buf, dirlen); dirname[dirlen] = '\0'; } /* Open the directory and search the entries for an exact match. */ dirp = opendir(dirname); if (dirp) { char *nameWithExt = buf + len - namelen; while ((dp = readdir(dirp)) != NULL) { const int thislen = #ifdef _DIRENT_HAVE_D_NAMELEN dp->d_namlen; #else strlen(dp->d_name); #endif if (thislen >= namelen && strcmp(dp->d_name, nameWithExt) == 0) { (void)closedir(dirp); return 1; /* Found */ } } (void)closedir(dirp); } return 0 ; /* Not found */ /* RISC OS */ #elif defined(RISCOS) char canon[MAXPATHLEN+1]; /* buffer for the canonical form of the path */ char buf2[MAXPATHLEN+2]; char *nameWithExt = buf+len-namelen; int canonlen; os_error *e; if (Py_GETENV("PYTHONCASEOK") != NULL) return 1; /* workaround: append wildcard, otherwise case of filename wouldn't be touched */ strcpy(buf2, buf); strcat(buf2, "*"); e = xosfscontrol_canonicalise_path(buf2,canon,0,0,MAXPATHLEN+1,&canonlen); canonlen = MAXPATHLEN+1-canonlen; if (e || canonlen<=0 || canonlen>(MAXPATHLEN+1) ) return 0; if (strcmp(nameWithExt, canon+canonlen-strlen(nameWithExt))==0) return 1; /* match */ return 0; /* OS/2 */ #elif defined(PYOS_OS2) HDIR hdir = 1; ULONG srchcnt = 1; FILEFINDBUF3 ffbuf; APIRET rc; if (getenv("PYTHONCASEOK") != NULL) return 1; rc = DosFindFirst(buf, &hdir, FILE_READONLY | FILE_HIDDEN | FILE_SYSTEM | FILE_DIRECTORY, &ffbuf, sizeof(ffbuf), &srchcnt, FIL_STANDARD); if (rc != NO_ERROR) return 0; return strncmp(ffbuf.achName, name, namelen) == 0; /* assuming it's a case-sensitive filesystem, so there's nothing to do! */ #else return 1; #endif } #ifdef HAVE_STAT /* Helper to look for __init__.py or __init__.py[co] in potential package */ static int find_init_module(char *buf) { const size_t save_len = strlen(buf); size_t i = save_len; char *pname; /* pointer to start of __init__ */ struct stat statbuf; /* For calling case_ok(buf, len, namelen, name): * /a/b/c/d/e/f/g/h/i/j/k/some_long_module_name.py\0 * ^ ^ ^ ^ * |--------------------- buf ---------------------| * |------------------- len ------------------| * |------ name -------| * |----- namelen -----| */ if (save_len + 13 >= MAXPATHLEN) return 0; buf[i++] = SEP; pname = buf + i; strcpy(pname, "__init__.py"); if (stat(buf, &statbuf) == 0) { if (case_ok(buf, save_len + 9, /* len("/__init__") */ 8, /* len("__init__") */ pname)) { buf[save_len] = '\0'; return 1; } } i += strlen(pname); strcpy(buf+i, Py_OptimizeFlag ? "o" : "c"); if (stat(buf, &statbuf) == 0) { if (case_ok(buf, save_len + 9, /* len("/__init__") */ 8, /* len("__init__") */ pname)) { buf[save_len] = '\0'; return 1; } } buf[save_len] = '\0'; return 0; } #else #ifdef RISCOS static int find_init_module(buf) char *buf; { int save_len = strlen(buf); int i = save_len; if (save_len + 13 >= MAXPATHLEN) return 0; buf[i++] = SEP; strcpy(buf+i, "__init__/py"); if (isfile(buf)) { buf[save_len] = '\0'; return 1; } if (Py_OptimizeFlag) strcpy(buf+i, "o"); else strcpy(buf+i, "c"); if (isfile(buf)) { buf[save_len] = '\0'; return 1; } buf[save_len] = '\0'; return 0; } #endif /*RISCOS*/ #endif /* HAVE_STAT */ static int init_builtin(char *); /* Forward */ /* Load an external module using the default search path and return its module object WITH INCREMENTED REFERENCE COUNT */ static PyObject * load_module(char *name, FILE *fp, char *buf, int type) { PyObject *modules; PyObject *m; int err; /* First check that there's an open file (if we need one) */ switch (type) { case PY_SOURCE: case PY_COMPILED: if (fp == NULL) { PyErr_Format(PyExc_ValueError, "file object required for import (type code %d)", type); return NULL; } } switch (type) { case PY_SOURCE: m = load_source_module(name, buf, fp); break; case PY_COMPILED: m = load_compiled_module(name, buf, fp); break; #ifdef HAVE_DYNAMIC_LOADING case C_EXTENSION: m = _PyImport_LoadDynamicModule(name, buf, fp); break; #endif #ifdef macintosh case PY_RESOURCE: m = PyMac_LoadResourceModule(name, buf); break; case PY_CODERESOURCE: m = PyMac_LoadCodeResourceModule(name, buf); break; #endif case PKG_DIRECTORY: m = load_package(name, buf); break; case C_BUILTIN: case PY_FROZEN: if (buf != NULL && buf[0] != '\0') name = buf; if (type == C_BUILTIN) err = init_builtin(name); else err = PyImport_ImportFrozenModule(name); if (err < 0) return NULL; if (err == 0) { PyErr_Format(PyExc_ImportError, "Purported %s module %.200s not found", type == C_BUILTIN ? "builtin" : "frozen", name); return NULL; } modules = PyImport_GetModuleDict(); m = PyDict_GetItemString(modules, name); if (m == NULL) { PyErr_Format( PyExc_ImportError, "%s module %.200s not properly initialized", type == C_BUILTIN ? "builtin" : "frozen", name); return NULL; } Py_INCREF(m); break; default: PyErr_Format(PyExc_ImportError, "Don't know how to import %.200s (type code %d)", name, type); m = NULL; } return m; } /* Initialize a built-in module. Return 1 for succes, 0 if the module is not found, and -1 with an exception set if the initialization failed. */ static int init_builtin(char *name) { struct _inittab *p; if (_PyImport_FindExtension(name, name) != NULL) return 1; for (p = PyImport_Inittab; p->name != NULL; p++) { if (strcmp(name, p->name) == 0) { if (p->initfunc == NULL) { PyErr_Format(PyExc_ImportError, "Cannot re-init internal module %.200s", name); return -1; } if (Py_VerboseFlag) PySys_WriteStderr("import %s # builtin\n", name); (*p->initfunc)(); if (PyErr_Occurred()) return -1; if (_PyImport_FixupExtension(name, name) == NULL) return -1; return 1; } } return 0; } /* Frozen modules */ static struct _frozen * find_frozen(char *name) { struct _frozen *p; for (p = PyImport_FrozenModules; ; p++) { if (p->name == NULL) return NULL; if (strcmp(p->name, name) == 0) break; } return p; } static PyObject * get_frozen_object(char *name) { struct _frozen *p = find_frozen(name); int size; if (p == NULL) { PyErr_Format(PyExc_ImportError, "No such frozen object named %.200s", name); return NULL; } if (p->code == NULL) { PyErr_Format(PyExc_ImportError, "Excluded frozen object named %.200s", name); return NULL; } size = p->size; if (size < 0) size = -size; return PyMarshal_ReadObjectFromString((char *)p->code, size); } /* Initialize a frozen module. Return 1 for succes, 0 if the module is not found, and -1 with an exception set if the initialization failed. This function is also used from frozenmain.c */ int PyImport_ImportFrozenModule(char *name) { struct _frozen *p = find_frozen(name); PyObject *co; PyObject *m; int ispackage; int size; if (p == NULL) return 0; if (p->code == NULL) { PyErr_Format(PyExc_ImportError, "Excluded frozen object named %.200s", name); return -1; } size = p->size; ispackage = (size < 0); if (ispackage) size = -size; if (Py_VerboseFlag) PySys_WriteStderr("import %s # frozen%s\n", name, ispackage ? " package" : ""); co = PyMarshal_ReadObjectFromString((char *)p->code, size); if (co == NULL) return -1; if (!PyCode_Check(co)) { Py_DECREF(co); PyErr_Format(PyExc_TypeError, "frozen object %.200s is not a code object", name); return -1; } if (ispackage) { /* Set __path__ to the package name */ PyObject *d, *s; int err; m = PyImport_AddModule(name); if (m == NULL) return -1; d = PyModule_GetDict(m); s = PyString_InternFromString(name); if (s == NULL) return -1; err = PyDict_SetItemString(d, "__path__", s); Py_DECREF(s); if (err != 0) return err; } m = PyImport_ExecCodeModuleEx(name, co, ""); Py_DECREF(co); if (m == NULL) return -1; Py_DECREF(m); return 1; } /* Import a module, either built-in, frozen, or external, and return its module object WITH INCREMENTED REFERENCE COUNT */ PyObject * PyImport_ImportModule(char *name) { PyObject *pname; PyObject *result; pname = PyString_FromString(name); result = PyImport_Import(pname); Py_DECREF(pname); return result; } /* Forward declarations for helper routines */ static PyObject *get_parent(PyObject *globals, char *buf, int *p_buflen); static PyObject *load_next(PyObject *mod, PyObject *altmod, char **p_name, char *buf, int *p_buflen); static int mark_miss(char *name); static int ensure_fromlist(PyObject *mod, PyObject *fromlist, char *buf, int buflen, int recursive); static PyObject * import_submodule(PyObject *mod, char *name, char *fullname); /* The Magnum Opus of dotted-name import :-) */ static PyObject * import_module_ex(char *name, PyObject *globals, PyObject *locals, PyObject *fromlist) { char buf[MAXPATHLEN+1]; int buflen = 0; PyObject *parent, *head, *next, *tail; parent = get_parent(globals, buf, &buflen); if (parent == NULL) return NULL; head = load_next(parent, Py_None, &name, buf, &buflen); if (head == NULL) return NULL; tail = head; Py_INCREF(tail); while (name) { next = load_next(tail, tail, &name, buf, &buflen); Py_DECREF(tail); if (next == NULL) { Py_DECREF(head); return NULL; } tail = next; } if (fromlist != NULL) { if (fromlist == Py_None || !PyObject_IsTrue(fromlist)) fromlist = NULL; } if (fromlist == NULL) { Py_DECREF(tail); return head; } Py_DECREF(head); if (!ensure_fromlist(tail, fromlist, buf, buflen, 0)) { Py_DECREF(tail); return NULL; } return tail; } PyObject * PyImport_ImportModuleEx(char *name, PyObject *globals, PyObject *locals, PyObject *fromlist) { PyObject *result; lock_import(); result = import_module_ex(name, globals, locals, fromlist); unlock_import(); return result; } static PyObject * get_parent(PyObject *globals, char *buf, int *p_buflen) { static PyObject *namestr = NULL; static PyObject *pathstr = NULL; PyObject *modname, *modpath, *modules, *parent; if (globals == NULL || !PyDict_Check(globals)) return Py_None; if (namestr == NULL) { namestr = PyString_InternFromString("__name__"); if (namestr == NULL) return NULL; } if (pathstr == NULL) { pathstr = PyString_InternFromString("__path__"); if (pathstr == NULL) return NULL; } *buf = '\0'; *p_buflen = 0; modname = PyDict_GetItem(globals, namestr); if (modname == NULL || !PyString_Check(modname)) return Py_None; modpath = PyDict_GetItem(globals, pathstr); if (modpath != NULL) { int len = PyString_GET_SIZE(modname); if (len > MAXPATHLEN) { PyErr_SetString(PyExc_ValueError, "Module name too long"); return NULL; } strcpy(buf, PyString_AS_STRING(modname)); *p_buflen = len; } else { char *start = PyString_AS_STRING(modname); char *lastdot = strrchr(start, '.'); size_t len; if (lastdot == NULL) return Py_None; len = lastdot - start; if (len >= MAXPATHLEN) { PyErr_SetString(PyExc_ValueError, "Module name too long"); return NULL; } strncpy(buf, start, len); buf[len] = '\0'; *p_buflen = len; } modules = PyImport_GetModuleDict(); parent = PyDict_GetItemString(modules, buf); if (parent == NULL) parent = Py_None; return parent; /* We expect, but can't guarantee, if parent != None, that: - parent.__name__ == buf - parent.__dict__ is globals If this is violated... Who cares? */ } /* altmod is either None or same as mod */ static PyObject * load_next(PyObject *mod, PyObject *altmod, char **p_name, char *buf, int *p_buflen) { char *name = *p_name; char *dot = strchr(name, '.'); size_t len; char *p; PyObject *result; if (dot == NULL) { *p_name = NULL; len = strlen(name); } else { *p_name = dot+1; len = dot-name; } if (len == 0) { PyErr_SetString(PyExc_ValueError, "Empty module name"); return NULL; } p = buf + *p_buflen; if (p != buf) *p++ = '.'; if (p+len-buf >= MAXPATHLEN) { PyErr_SetString(PyExc_ValueError, "Module name too long"); return NULL; } strncpy(p, name, len); p[len] = '\0'; *p_buflen = p+len-buf; result = import_submodule(mod, p, buf); if (result == Py_None && altmod != mod) { Py_DECREF(result); /* Here, altmod must be None and mod must not be None */ result = import_submodule(altmod, p, p); if (result != NULL && result != Py_None) { if (mark_miss(buf) != 0) { Py_DECREF(result); return NULL; } strncpy(buf, name, len); buf[len] = '\0'; *p_buflen = len; } } if (result == NULL) return NULL; if (result == Py_None) { Py_DECREF(result); PyErr_Format(PyExc_ImportError, "No module named %.200s", name); return NULL; } return result; } static int mark_miss(char *name) { PyObject *modules = PyImport_GetModuleDict(); return PyDict_SetItemString(modules, name, Py_None); } static int ensure_fromlist(PyObject *mod, PyObject *fromlist, char *buf, int buflen, int recursive) { int i; if (!PyObject_HasAttrString(mod, "__path__")) return 1; for (i = 0; ; i++) { PyObject *item = PySequence_GetItem(fromlist, i); int hasit; if (item == NULL) { if (PyErr_ExceptionMatches(PyExc_IndexError)) { PyErr_Clear(); return 1; } return 0; } if (!PyString_Check(item)) { PyErr_SetString(PyExc_TypeError, "Item in ``from list'' not a string"); Py_DECREF(item); return 0; } if (PyString_AS_STRING(item)[0] == '*') { PyObject *all; Py_DECREF(item); /* See if the package defines __all__ */ if (recursive) continue; /* Avoid endless recursion */ all = PyObject_GetAttrString(mod, "__all__"); if (all == NULL) PyErr_Clear(); else { if (!ensure_fromlist(mod, all, buf, buflen, 1)) return 0; Py_DECREF(all); } continue; } hasit = PyObject_HasAttr(mod, item); if (!hasit) { char *subname = PyString_AS_STRING(item); PyObject *submod; char *p; if (buflen + strlen(subname) >= MAXPATHLEN) { PyErr_SetString(PyExc_ValueError, "Module name too long"); Py_DECREF(item); return 0; } p = buf + buflen; *p++ = '.'; strcpy(p, subname); submod = import_submodule(mod, subname, buf); Py_XDECREF(submod); if (submod == NULL) { Py_DECREF(item); return 0; } } Py_DECREF(item); } /* NOTREACHED */ } static PyObject * import_submodule(PyObject *mod, char *subname, char *fullname) { PyObject *modules = PyImport_GetModuleDict(); PyObject *m, *res = NULL; /* Require: if mod == None: subname == fullname else: mod.__name__ + "." + subname == fullname */ if ((m = PyDict_GetItemString(modules, fullname)) != NULL) { Py_INCREF(m); } else { PyObject *path; char buf[MAXPATHLEN+1]; struct filedescr *fdp; FILE *fp = NULL; if (mod == Py_None) path = NULL; else { path = PyObject_GetAttrString(mod, "__path__"); if (path == NULL) { PyErr_Clear(); Py_INCREF(Py_None); return Py_None; } } buf[0] = '\0'; fdp = find_module(subname, path, buf, MAXPATHLEN+1, &fp); Py_XDECREF(path); if (fdp == NULL) { if (!PyErr_ExceptionMatches(PyExc_ImportError)) return NULL; PyErr_Clear(); Py_INCREF(Py_None); return Py_None; } m = load_module(fullname, fp, buf, fdp->type); if (fp) fclose(fp); if (mod != Py_None) { /* Irrespective of the success of this load, make a reference to it in the parent package module. A copy gets saved in the modules dictionary under the full name, so get a reference from there, if need be. (The exception is when the load failed with a SyntaxError -- then there's no trace in sys.modules. In that case, of course, do nothing extra.) */ res = m; if (res == NULL) res = PyDict_GetItemString(modules, fullname); if (res != NULL && PyObject_SetAttrString(mod, subname, res) < 0) { Py_XDECREF(m); m = NULL; } } } return m; } /* Re-import a module of any kind and return its module object, WITH INCREMENTED REFERENCE COUNT */ PyObject * PyImport_ReloadModule(PyObject *m) { PyObject *modules = PyImport_GetModuleDict(); PyObject *path = NULL; char *name, *subname; char buf[MAXPATHLEN+1]; struct filedescr *fdp; FILE *fp = NULL; if (m == NULL || !PyModule_Check(m)) { PyErr_SetString(PyExc_TypeError, "reload() argument must be module"); return NULL; } name = PyModule_GetName(m); if (name == NULL) return NULL; if (m != PyDict_GetItemString(modules, name)) { PyErr_Format(PyExc_ImportError, "reload(): module %.200s not in sys.modules", name); return NULL; } subname = strrchr(name, '.'); if (subname == NULL) subname = name; else { PyObject *parentname, *parent; parentname = PyString_FromStringAndSize(name, (subname-name)); if (parentname == NULL) return NULL; parent = PyDict_GetItem(modules, parentname); Py_DECREF(parentname); if (parent == NULL) { PyErr_Format(PyExc_ImportError, "reload(): parent %.200s not in sys.modules", name); return NULL; } subname++; path = PyObject_GetAttrString(parent, "__path__"); if (path == NULL) PyErr_Clear(); } buf[0] = '\0'; fdp = find_module(subname, path, buf, MAXPATHLEN+1, &fp); Py_XDECREF(path); if (fdp == NULL) return NULL; m = load_module(name, fp, buf, fdp->type); if (fp) fclose(fp); return m; } /* Higher-level import emulator which emulates the "import" statement more accurately -- it invokes the __import__() function from the builtins of the current globals. This means that the import is done using whatever import hooks are installed in the current environment, e.g. by "rexec". A dummy list ["__doc__"] is passed as the 4th argument so that e.g. PyImport_Import(PyString_FromString("win32com.client.gencache")) will return instead of . */ PyObject * PyImport_Import(PyObject *module_name) { static PyObject *silly_list = NULL; static PyObject *builtins_str = NULL; static PyObject *import_str = NULL; PyObject *globals = NULL; PyObject *import = NULL; PyObject *builtins = NULL; PyObject *r = NULL; /* Initialize constant string objects */ if (silly_list == NULL) { import_str = PyString_InternFromString("__import__"); if (import_str == NULL) return NULL; builtins_str = PyString_InternFromString("__builtins__"); if (builtins_str == NULL) return NULL; silly_list = Py_BuildValue("[s]", "__doc__"); if (silly_list == NULL) return NULL; } /* Get the builtins from current globals */ globals = PyEval_GetGlobals(); if (globals != NULL) { Py_INCREF(globals); builtins = PyObject_GetItem(globals, builtins_str); if (builtins == NULL) goto err; } else { /* No globals -- use standard builtins, and fake globals */ PyErr_Clear(); builtins = PyImport_ImportModuleEx("__builtin__", NULL, NULL, NULL); if (builtins == NULL) return NULL; globals = Py_BuildValue("{OO}", builtins_str, builtins); if (globals == NULL) goto err; } /* Get the __import__ function from the builtins */ if (PyDict_Check(builtins)) { import = PyObject_GetItem(builtins, import_str); if (import == NULL) PyErr_SetObject(PyExc_KeyError, import_str); } else import = PyObject_GetAttr(builtins, import_str); if (import == NULL) goto err; /* Call the _import__ function with the proper argument list */ r = PyObject_CallFunction(import, "OOOO", module_name, globals, globals, silly_list); err: Py_XDECREF(globals); Py_XDECREF(builtins); Py_XDECREF(import); return r; } /* Module 'imp' provides Python access to the primitives used for importing modules. */ static PyObject * imp_get_magic(PyObject *self, PyObject *args) { char buf[4]; if (!PyArg_ParseTuple(args, ":get_magic")) return NULL; buf[0] = (char) ((pyc_magic >> 0) & 0xff); buf[1] = (char) ((pyc_magic >> 8) & 0xff); buf[2] = (char) ((pyc_magic >> 16) & 0xff); buf[3] = (char) ((pyc_magic >> 24) & 0xff); return PyString_FromStringAndSize(buf, 4); } static PyObject * imp_get_suffixes(PyObject *self, PyObject *args) { PyObject *list; struct filedescr *fdp; if (!PyArg_ParseTuple(args, ":get_suffixes")) return NULL; list = PyList_New(0); if (list == NULL) return NULL; for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) { PyObject *item = Py_BuildValue("ssi", fdp->suffix, fdp->mode, fdp->type); if (item == NULL) { Py_DECREF(list); return NULL; } if (PyList_Append(list, item) < 0) { Py_DECREF(list); Py_DECREF(item); return NULL; } Py_DECREF(item); } return list; } static PyObject * call_find_module(char *name, PyObject *path) { extern int fclose(FILE *); PyObject *fob, *ret; struct filedescr *fdp; char pathname[MAXPATHLEN+1]; FILE *fp = NULL; pathname[0] = '\0'; if (path == Py_None) path = NULL; fdp = find_module(name, path, pathname, MAXPATHLEN+1, &fp); if (fdp == NULL) return NULL; if (fp != NULL) { fob = PyFile_FromFile(fp, pathname, fdp->mode, fclose); if (fob == NULL) { fclose(fp); return NULL; } } else { fob = Py_None; Py_INCREF(fob); } ret = Py_BuildValue("Os(ssi)", fob, pathname, fdp->suffix, fdp->mode, fdp->type); Py_DECREF(fob); return ret; } static PyObject * imp_find_module(PyObject *self, PyObject *args) { char *name; PyObject *path = NULL; if (!PyArg_ParseTuple(args, "s|O:find_module", &name, &path)) return NULL; return call_find_module(name, path); } static PyObject * imp_init_builtin(PyObject *self, PyObject *args) { char *name; int ret; PyObject *m; if (!PyArg_ParseTuple(args, "s:init_builtin", &name)) return NULL; ret = init_builtin(name); if (ret < 0) return NULL; if (ret == 0) { Py_INCREF(Py_None); return Py_None; } m = PyImport_AddModule(name); Py_XINCREF(m); return m; } static PyObject * imp_init_frozen(PyObject *self, PyObject *args) { char *name; int ret; PyObject *m; if (!PyArg_ParseTuple(args, "s:init_frozen", &name)) return NULL; ret = PyImport_ImportFrozenModule(name); if (ret < 0) return NULL; if (ret == 0) { Py_INCREF(Py_None); return Py_None; } m = PyImport_AddModule(name); Py_XINCREF(m); return m; } /* Keep a reference to the tuple used to build PyImport_FrozenModules, as it points to the raw string data inside the tuple. */ static PyObject *frozenmodulestuple = NULL; static PyObject * imp_set_frozenmodules(PyObject *self, PyObject *args) { PyObject *t, *item, *name, *code, *ispkg; struct _frozen *frozenmodules; int n, i; if (!PyArg_ParseTuple(args, "O:set_frozenmodules", &t)) return NULL; /* turn the argument into a tuple so we're sure our list isn't being tampered with behind our backs */ t = PySequence_Tuple(t); if (t == NULL) return NULL; n = PyTuple_Size(t); frozenmodules = PyMem_Malloc((n + 1)* sizeof(struct _frozen)); if (frozenmodules == NULL) { PyErr_SetString(PyExc_MemoryError, "no memory to allocate frozen array"); goto error; } for (i = 0; i < n; i++) { item = PyTuple_GetItem(t, i); if (item == NULL) goto error; if (!PyTuple_Check(item) || PyTuple_Size(item) != 3) goto typeerror; name = PyTuple_GetItem(item, 0); code = PyTuple_GetItem(item, 1); ispkg = PyTuple_GetItem(item, 2); if (!PyString_Check(name) || (PyObject_IsTrue(code) && !PyString_Check(code))) goto typeerror; frozenmodules[i].name = PyString_AsString(name); if (PyObject_IsTrue(code)) { frozenmodules[i].code = PyString_AsString(code); frozenmodules[i].size = PyString_Size(code); } else { frozenmodules[i].code = NULL; frozenmodules[i].size = 0; } if (PyObject_IsTrue(ispkg)) frozenmodules[i].size = -frozenmodules[i].size; } frozenmodules[n].name = NULL; /* sentinel */ frozenmodules[n].code = NULL; frozenmodules[n].size = 0; if (frozenmodulestuple != NULL) { Py_DECREF(frozenmodulestuple); PyMem_Free(PyImport_FrozenModules); } /* else we don't know how or if PyImport_FrozenModules were allocated, so we can't do anything. */ frozenmodulestuple = t; PyImport_FrozenModules = frozenmodules; Py_INCREF(Py_None); return Py_None; typeerror: PyErr_SetString(PyExc_TypeError, "items must be tuples of length 3, " "containing two strings and a bool"); error: Py_DECREF(t); PyMem_Free(frozenmodules); return NULL; } static PyObject * imp_get_frozenmodules(PyObject *self, PyObject *args) { PyObject *t, *item, *ob; int i; struct _frozen *p; if (!PyArg_ParseTuple(args, ":get_frozenmodules")) return NULL; /* We could just return frozenmodulestuple if it isn't NULL, but it's possible a C extension stepped on PyImport_FrozenModules after us, so we always build a new tuple. */ for (p = PyImport_FrozenModules, i = 0; ; p++, i++) { if (p->name == NULL) break; } t = PyTuple_New(i); if (t == NULL) return NULL; for (p = PyImport_FrozenModules, i = 0; ; p++, i++) { if (p->name == NULL) break; item = PyTuple_New(3); if (item == NULL) goto error; ob = PyString_FromString(p->name); if (ob == NULL) goto error; Py_INCREF(ob); PyTuple_SET_ITEM(item, 0, ob); if (p->code != NULL) { ob = PyString_FromStringAndSize(p->code, p->size >= 0 ? p->size : -(p->size)); if (ob == NULL) goto error; } else ob = Py_None; Py_INCREF(ob); PyTuple_SET_ITEM(item, 1, ob); ob = p->size >= 0 ? Py_False : Py_True; Py_INCREF(ob); PyTuple_SET_ITEM(item, 2, ob); PyTuple_SET_ITEM(t, i, item); } return t; error: Py_DECREF(t); return NULL; } static PyObject * imp_get_frozen_object(PyObject *self, PyObject *args) { char *name; if (!PyArg_ParseTuple(args, "s:get_frozen_object", &name)) return NULL; return get_frozen_object(name); } static PyObject * imp_is_builtin(PyObject *self, PyObject *args) { char *name; if (!PyArg_ParseTuple(args, "s:is_builtin", &name)) return NULL; return PyInt_FromLong(is_builtin(name)); } static PyObject * imp_is_frozen(PyObject *self, PyObject *args) { char *name; struct _frozen *p; if (!PyArg_ParseTuple(args, "s:is_frozen", &name)) return NULL; p = find_frozen(name); return PyBool_FromLong((long) (p == NULL ? 0 : p->size)); } static FILE * get_file(char *pathname, PyObject *fob, char *mode) { FILE *fp; if (fob == NULL) { if (mode[0] == 'U') mode = "r" PY_STDIOTEXTMODE; fp = fopen(pathname, mode); if (fp == NULL) PyErr_SetFromErrno(PyExc_IOError); } else { fp = PyFile_AsFile(fob); if (fp == NULL) PyErr_SetString(PyExc_ValueError, "bad/closed file object"); } return fp; } static PyObject * imp_load_compiled(PyObject *self, PyObject *args) { char *name; char *pathname; PyObject *fob = NULL; PyObject *m; FILE *fp; if (!PyArg_ParseTuple(args, "ss|O!:load_compiled", &name, &pathname, &PyFile_Type, &fob)) return NULL; fp = get_file(pathname, fob, "rb"); if (fp == NULL) return NULL; m = load_compiled_module(name, pathname, fp); if (fob == NULL) fclose(fp); return m; } #ifdef HAVE_DYNAMIC_LOADING static PyObject * imp_load_dynamic(PyObject *self, PyObject *args) { char *name; char *pathname; PyObject *fob = NULL; PyObject *m; FILE *fp = NULL; if (!PyArg_ParseTuple(args, "ss|O!:load_dynamic", &name, &pathname, &PyFile_Type, &fob)) return NULL; if (fob) { fp = get_file(pathname, fob, "r"); if (fp == NULL) return NULL; } m = _PyImport_LoadDynamicModule(name, pathname, fp); return m; } #endif /* HAVE_DYNAMIC_LOADING */ static PyObject * imp_load_source(PyObject *self, PyObject *args) { char *name; char *pathname; PyObject *fob = NULL; PyObject *m; FILE *fp; if (!PyArg_ParseTuple(args, "ss|O!:load_source", &name, &pathname, &PyFile_Type, &fob)) return NULL; fp = get_file(pathname, fob, "r"); if (fp == NULL) return NULL; m = load_source_module(name, pathname, fp); if (fob == NULL) fclose(fp); return m; } #ifdef macintosh static PyObject * imp_load_resource(PyObject *self, PyObject *args) { char *name; char *pathname; PyObject *m; if (!PyArg_ParseTuple(args, "ss:load_resource", &name, &pathname)) return NULL; m = PyMac_LoadResourceModule(name, pathname); return m; } #endif /* macintosh */ static PyObject * imp_load_module(PyObject *self, PyObject *args) { char *name; PyObject *fob; char *pathname; char *suffix; /* Unused */ char *mode; int type; FILE *fp; if (!PyArg_ParseTuple(args, "sOs(ssi):load_module", &name, &fob, &pathname, &suffix, &mode, &type)) return NULL; if (*mode) { /* Mode must start with 'r' or 'U' and must not contain '+'. Implicit in this test is the assumption that the mode may contain other modifiers like 'b' or 't'. */ if (!(*mode == 'r' || *mode == 'U') || strchr(mode, '+')) { PyErr_Format(PyExc_ValueError, "invalid file open mode %.200s", mode); return NULL; } } if (fob == Py_None) fp = NULL; else { if (!PyFile_Check(fob)) { PyErr_SetString(PyExc_ValueError, "load_module arg#2 should be a file or None"); return NULL; } fp = get_file(pathname, fob, mode); if (fp == NULL) return NULL; } return load_module(name, fp, pathname, type); } static PyObject * imp_load_package(PyObject *self, PyObject *args) { char *name; char *pathname; if (!PyArg_ParseTuple(args, "ss:load_package", &name, &pathname)) return NULL; return load_package(name, pathname); } static PyObject * imp_new_module(PyObject *self, PyObject *args) { char *name; if (!PyArg_ParseTuple(args, "s:new_module", &name)) return NULL; return PyModule_New(name); } /* Doc strings */ PyDoc_STRVAR(doc_imp, "This module provides the components needed to build your own\n\ __import__ function. Undocumented functions are obsolete."); PyDoc_STRVAR(doc_find_module, "find_module(name, [path]) -> (file, filename, (suffix, mode, type))\n\ Search for a module. If path is omitted or None, search for a\n\ built-in, frozen or special module and continue search in sys.path.\n\ The module name cannot contain '.'; to search for a submodule of a\n\ package, pass the submodule name and the package's __path__."); PyDoc_STRVAR(doc_load_module, "load_module(name, file, filename, (suffix, mode, type)) -> module\n\ Load a module, given information returned by find_module().\n\ The module name must include the full package name, if any."); PyDoc_STRVAR(doc_get_magic, "get_magic() -> string\n\ Return the magic number for .pyc or .pyo files."); PyDoc_STRVAR(doc_get_suffixes, "get_suffixes() -> [(suffix, mode, type), ...]\n\ Return a list of (suffix, mode, type) tuples describing the files\n\ that find_module() looks for."); PyDoc_STRVAR(doc_new_module, "new_module(name) -> module\n\ Create a new module. Do not enter it in sys.modules.\n\ The module name must include the full package name, if any."); PyDoc_STRVAR(doc_lock_held, "lock_held() -> 0 or 1\n\ Return 1 if the import lock is currently held.\n\ On platforms without threads, return 0."); PyDoc_STRVAR(doc_set_frozenmodules, "set_frozenmodules(seq_of_tuples) -> None\n\ Set the global list of frozen modules.\n\ The single argument is a sequence of tuples of length 3:\n\ (modulename, codedata, ispkg)\n\ 'modulename' is the name of the frozen module (may contain dots).\n\ 'codedata' is a marshalled code object. 'ispkg' is a boolean\n\ indicating whether the module is a package."); PyDoc_STRVAR(doc_get_frozenmodules, "get_frozenmodules() -> tuple_of_tuples\n\ Return the global list of frozen modules as a tuple of tuples. See\n\ the set_frozenmodules() doc string for a description of its contents."); static PyMethodDef imp_methods[] = { {"find_module", imp_find_module, METH_VARARGS, doc_find_module}, {"get_magic", imp_get_magic, METH_VARARGS, doc_get_magic}, {"get_suffixes", imp_get_suffixes, METH_VARARGS, doc_get_suffixes}, {"load_module", imp_load_module, METH_VARARGS, doc_load_module}, {"new_module", imp_new_module, METH_VARARGS, doc_new_module}, {"lock_held", imp_lock_held, METH_VARARGS, doc_lock_held}, {"set_frozenmodules", imp_set_frozenmodules, METH_VARARGS, doc_set_frozenmodules}, {"get_frozenmodules", imp_get_frozenmodules, METH_VARARGS, doc_get_frozenmodules}, /* The rest are obsolete */ {"get_frozen_object", imp_get_frozen_object, METH_VARARGS}, {"init_builtin", imp_init_builtin, METH_VARARGS}, {"init_frozen", imp_init_frozen, METH_VARARGS}, {"is_builtin", imp_is_builtin, METH_VARARGS}, {"is_frozen", imp_is_frozen, METH_VARARGS}, {"load_compiled", imp_load_compiled, METH_VARARGS}, #ifdef HAVE_DYNAMIC_LOADING {"load_dynamic", imp_load_dynamic, METH_VARARGS}, #endif {"load_package", imp_load_package, METH_VARARGS}, #ifdef macintosh {"load_resource", imp_load_resource, METH_VARARGS}, #endif {"load_source", imp_load_source, METH_VARARGS}, {NULL, NULL} /* sentinel */ }; static int setint(PyObject *d, char *name, int value) { PyObject *v; int err; v = PyInt_FromLong((long)value); err = PyDict_SetItemString(d, name, v); Py_XDECREF(v); return err; } void initimp(void) { PyObject *m, *d; m = Py_InitModule4("imp", imp_methods, doc_imp, NULL, PYTHON_API_VERSION); d = PyModule_GetDict(m); if (setint(d, "SEARCH_ERROR", SEARCH_ERROR) < 0) goto failure; if (setint(d, "PY_SOURCE", PY_SOURCE) < 0) goto failure; if (setint(d, "PY_COMPILED", PY_COMPILED) < 0) goto failure; if (setint(d, "C_EXTENSION", C_EXTENSION) < 0) goto failure; if (setint(d, "PY_RESOURCE", PY_RESOURCE) < 0) goto failure; if (setint(d, "PKG_DIRECTORY", PKG_DIRECTORY) < 0) goto failure; if (setint(d, "C_BUILTIN", C_BUILTIN) < 0) goto failure; if (setint(d, "PY_FROZEN", PY_FROZEN) < 0) goto failure; if (setint(d, "PY_CODERESOURCE", PY_CODERESOURCE) < 0) goto failure; failure: ; } /* API for embedding applications that want to add their own entries to the table of built-in modules. This should normally be called *before* Py_Initialize(). When the table resize fails, -1 is returned and the existing table is unchanged. After a similar function by Just van Rossum. */ int PyImport_ExtendInittab(struct _inittab *newtab) { static struct _inittab *our_copy = NULL; struct _inittab *p; int i, n; /* Count the number of entries in both tables */ for (n = 0; newtab[n].name != NULL; n++) ; if (n == 0) return 0; /* Nothing to do */ for (i = 0; PyImport_Inittab[i].name != NULL; i++) ; /* Allocate new memory for the combined table */ p = our_copy; PyMem_RESIZE(p, struct _inittab, i+n+1); if (p == NULL) return -1; /* Copy the tables into the new memory */ if (our_copy != PyImport_Inittab) memcpy(p, PyImport_Inittab, (i+1) * sizeof(struct _inittab)); PyImport_Inittab = our_copy = p; memcpy(p+i, newtab, (n+1) * sizeof(struct _inittab)); return 0; } /* Shorthand to add a single entry given a name and a function */ int PyImport_AppendInittab(char *name, void (*initfunc)(void)) { struct _inittab newtab[2]; memset(newtab, '\0', sizeof newtab); newtab[0].name = name; newtab[0].initfunc = initfunc; return PyImport_ExtendInittab(newtab); }