mirror of
https://github.com/python/cpython.git
synced 2024-11-25 02:44:06 +08:00
d5fadf75e4
Add definitions of INT_MAX and LONG_MAX to pyport.h. Remove includes of limits.h and conditional definitions of INT_MAX and LONG_MAX elsewhere. This closes SourceForge patch #101659 and bug #115323.
437 lines
10 KiB
C
437 lines
10 KiB
C
/* ------------------------------------------------------------------------
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Python Codec Registry and support functions
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Written by Marc-Andre Lemburg (mal@lemburg.com).
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Copyright (c) Corporation for National Research Initiatives.
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------------------------------------------------------------------------ */
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#include "Python.h"
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#include <ctype.h>
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/* --- Globals ------------------------------------------------------------ */
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static PyObject *_PyCodec_SearchPath;
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static PyObject *_PyCodec_SearchCache;
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/* Flag used for lazy import of the standard encodings package */
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static int import_encodings_called = 0;
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/* --- Codec Registry ----------------------------------------------------- */
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/* Import the standard encodings package which will register the first
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codec search function.
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This is done in a lazy way so that the Unicode implementation does
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not downgrade startup time of scripts not needing it.
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ImportErrors are silently ignored by this function. Only one try is
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made.
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*/
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static
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int import_encodings(void)
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{
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PyObject *mod;
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import_encodings_called = 1;
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mod = PyImport_ImportModule("encodings");
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if (mod == NULL) {
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if (PyErr_ExceptionMatches(PyExc_ImportError)) {
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/* Ignore ImportErrors... this is done so that
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distributions can disable the encodings package. Note
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that other errors are not masked, e.g. SystemErrors
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raised to inform the user of an error in the Python
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configuration are still reported back to the user. */
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PyErr_Clear();
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return 0;
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}
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return -1;
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}
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Py_DECREF(mod);
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return 0;
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}
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int PyCodec_Register(PyObject *search_function)
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{
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if (!import_encodings_called) {
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if (import_encodings())
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goto onError;
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}
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if (search_function == NULL) {
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PyErr_BadArgument();
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goto onError;
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}
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if (!PyCallable_Check(search_function)) {
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PyErr_SetString(PyExc_TypeError,
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"argument must be callable");
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goto onError;
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}
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return PyList_Append(_PyCodec_SearchPath, search_function);
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onError:
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return -1;
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}
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/* Convert a string to a normalized Python string: all characters are
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converted to lower case, spaces are replaced with underscores. */
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static
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PyObject *normalizestring(const char *string)
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{
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register size_t i;
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size_t len = strlen(string);
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char *p;
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PyObject *v;
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if (len > INT_MAX) {
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PyErr_SetString(PyExc_OverflowError, "string is too large");
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return NULL;
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}
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v = PyString_FromStringAndSize(NULL, (int)len);
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if (v == NULL)
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return NULL;
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p = PyString_AS_STRING(v);
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for (i = 0; i < len; i++) {
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register char ch = string[i];
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if (ch == ' ')
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ch = '-';
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else
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ch = tolower(ch);
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p[i] = ch;
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}
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return v;
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}
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/* Lookup the given encoding and return a tuple providing the codec
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facilities.
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The encoding string is looked up converted to all lower-case
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characters. This makes encodings looked up through this mechanism
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effectively case-insensitive.
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If no codec is found, a LookupError is set and NULL returned.
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As side effect, this tries to load the encodings package, if not
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yet done. This is part of the lazy load strategy for the encodings
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package.
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*/
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PyObject *_PyCodec_Lookup(const char *encoding)
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{
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PyObject *result, *args = NULL, *v;
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int i, len;
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if (encoding == NULL) {
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PyErr_BadArgument();
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goto onError;
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}
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if (_PyCodec_SearchCache == NULL ||
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_PyCodec_SearchPath == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"codec module not properly initialized");
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goto onError;
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}
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if (!import_encodings_called) {
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if (import_encodings())
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goto onError;
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}
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/* Convert the encoding to a normalized Python string: all
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characters are converted to lower case, spaces and hyphens are
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replaced with underscores. */
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v = normalizestring(encoding);
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if (v == NULL)
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goto onError;
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PyString_InternInPlace(&v);
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/* First, try to lookup the name in the registry dictionary */
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result = PyDict_GetItem(_PyCodec_SearchCache, v);
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if (result != NULL) {
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Py_INCREF(result);
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Py_DECREF(v);
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return result;
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}
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/* Next, scan the search functions in order of registration */
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args = PyTuple_New(1);
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if (args == NULL)
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goto onError;
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PyTuple_SET_ITEM(args,0,v);
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len = PyList_Size(_PyCodec_SearchPath);
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if (len < 0)
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goto onError;
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if (len == 0) {
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PyErr_SetString(PyExc_LookupError,
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"no codec search functions registered: "
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"can't find encoding");
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goto onError;
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}
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for (i = 0; i < len; i++) {
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PyObject *func;
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func = PyList_GetItem(_PyCodec_SearchPath, i);
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if (func == NULL)
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goto onError;
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result = PyEval_CallObject(func, args);
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if (result == NULL)
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goto onError;
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if (result == Py_None) {
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Py_DECREF(result);
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continue;
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}
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if (!PyTuple_Check(result) || PyTuple_GET_SIZE(result) != 4) {
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PyErr_SetString(PyExc_TypeError,
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"codec search functions must return 4-tuples");
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Py_DECREF(result);
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goto onError;
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}
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break;
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}
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if (i == len) {
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/* XXX Perhaps we should cache misses too ? */
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PyErr_SetString(PyExc_LookupError,
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"unknown encoding");
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goto onError;
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}
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/* Cache and return the result */
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PyDict_SetItem(_PyCodec_SearchCache, v, result);
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Py_DECREF(args);
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return result;
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onError:
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Py_XDECREF(args);
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return NULL;
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}
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static
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PyObject *args_tuple(PyObject *object,
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const char *errors)
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{
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PyObject *args;
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args = PyTuple_New(1 + (errors != NULL));
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if (args == NULL)
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return NULL;
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Py_INCREF(object);
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PyTuple_SET_ITEM(args,0,object);
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if (errors) {
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PyObject *v;
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v = PyString_FromString(errors);
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if (v == NULL) {
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Py_DECREF(args);
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return NULL;
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}
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PyTuple_SET_ITEM(args, 1, v);
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}
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return args;
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}
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/* Build a codec by calling factory(stream[,errors]) or just
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factory(errors) depending on whether the given parameters are
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non-NULL. */
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static
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PyObject *build_stream_codec(PyObject *factory,
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PyObject *stream,
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const char *errors)
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{
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PyObject *args, *codec;
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args = args_tuple(stream, errors);
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if (args == NULL)
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return NULL;
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codec = PyEval_CallObject(factory, args);
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Py_DECREF(args);
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return codec;
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}
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/* Convenience APIs to query the Codec registry.
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All APIs return a codec object with incremented refcount.
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*/
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PyObject *PyCodec_Encoder(const char *encoding)
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{
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PyObject *codecs;
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PyObject *v;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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v = PyTuple_GET_ITEM(codecs,0);
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Py_INCREF(v);
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return v;
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onError:
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return NULL;
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}
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PyObject *PyCodec_Decoder(const char *encoding)
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{
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PyObject *codecs;
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PyObject *v;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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v = PyTuple_GET_ITEM(codecs,1);
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Py_INCREF(v);
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return v;
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onError:
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return NULL;
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}
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PyObject *PyCodec_StreamReader(const char *encoding,
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PyObject *stream,
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const char *errors)
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{
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PyObject *codecs;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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return build_stream_codec(PyTuple_GET_ITEM(codecs,2),stream,errors);
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onError:
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return NULL;
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}
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PyObject *PyCodec_StreamWriter(const char *encoding,
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PyObject *stream,
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const char *errors)
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{
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PyObject *codecs;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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return build_stream_codec(PyTuple_GET_ITEM(codecs,3),stream,errors);
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onError:
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return NULL;
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}
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/* Encode an object (e.g. an Unicode object) using the given encoding
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and return the resulting encoded object (usually a Python string).
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errors is passed to the encoder factory as argument if non-NULL. */
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PyObject *PyCodec_Encode(PyObject *object,
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const char *encoding,
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const char *errors)
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{
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PyObject *encoder = NULL;
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PyObject *args = NULL, *result;
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PyObject *v;
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encoder = PyCodec_Encoder(encoding);
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if (encoder == NULL)
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goto onError;
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args = args_tuple(object, errors);
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if (args == NULL)
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goto onError;
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result = PyEval_CallObject(encoder,args);
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if (result == NULL)
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goto onError;
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if (!PyTuple_Check(result) ||
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PyTuple_GET_SIZE(result) != 2) {
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PyErr_SetString(PyExc_TypeError,
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"encoder must return a tuple (object,integer)");
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goto onError;
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}
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v = PyTuple_GET_ITEM(result,0);
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Py_INCREF(v);
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/* We don't check or use the second (integer) entry. */
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Py_DECREF(args);
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Py_DECREF(encoder);
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Py_DECREF(result);
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return v;
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onError:
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Py_XDECREF(args);
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Py_XDECREF(encoder);
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return NULL;
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}
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/* Decode an object (usually a Python string) using the given encoding
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and return an equivalent object (e.g. an Unicode object).
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errors is passed to the decoder factory as argument if non-NULL. */
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PyObject *PyCodec_Decode(PyObject *object,
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const char *encoding,
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const char *errors)
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{
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PyObject *decoder = NULL;
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PyObject *args = NULL, *result = NULL;
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PyObject *v;
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decoder = PyCodec_Decoder(encoding);
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if (decoder == NULL)
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goto onError;
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args = args_tuple(object, errors);
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if (args == NULL)
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goto onError;
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result = PyEval_CallObject(decoder,args);
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if (result == NULL)
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goto onError;
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if (!PyTuple_Check(result) ||
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PyTuple_GET_SIZE(result) != 2) {
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PyErr_SetString(PyExc_TypeError,
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"decoder must return a tuple (object,integer)");
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goto onError;
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}
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v = PyTuple_GET_ITEM(result,0);
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Py_INCREF(v);
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/* We don't check or use the second (integer) entry. */
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Py_DECREF(args);
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Py_DECREF(decoder);
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Py_DECREF(result);
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return v;
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onError:
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Py_XDECREF(args);
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Py_XDECREF(decoder);
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Py_XDECREF(result);
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return NULL;
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}
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void _PyCodecRegistry_Init(void)
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{
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if (_PyCodec_SearchPath == NULL)
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_PyCodec_SearchPath = PyList_New(0);
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if (_PyCodec_SearchCache == NULL)
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_PyCodec_SearchCache = PyDict_New();
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if (_PyCodec_SearchPath == NULL ||
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_PyCodec_SearchCache == NULL)
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Py_FatalError("can't initialize codec registry");
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}
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void _PyCodecRegistry_Fini(void)
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{
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Py_XDECREF(_PyCodec_SearchPath);
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_PyCodec_SearchPath = NULL;
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Py_XDECREF(_PyCodec_SearchCache);
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_PyCodec_SearchCache = NULL;
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}
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