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bpo-41842: Add codecs.unregister() function (GH-22360)

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Add codecs.unregister() and PyCodec_Unregister() functions
to unregister a codec search function.
This commit is contained in:
Hai Shi 2020-09-29 05:41:11 +08:00 • committed by GitHub
parent 24ba3b0df5
commit d332e7b816
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 108 additions and 5 deletions
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25
Python/codecs.c
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@ -50,6 +50,31 @@ int PyCodec_Register(PyObject *search_function)
return -1;
}
int
PyCodec_Unregister(PyObject *search_function)
{
PyInterpreterState *interp = PyInterpreterState_Get();
PyObject *codec_search_path = interp->codec_search_path;
/* Do nothing if codec_search_path is not created yet or was cleared. */
if (codec_search_path == NULL) {
return 0;
}
assert(PyList_CheckExact(codec_search_path));
Py_ssize_t n = PyList_GET_SIZE(codec_search_path);
for (Py_ssize_t i = 0; i < n; i++) {
PyObject *item = PyList_GET_ITEM(codec_search_path, i);
if (item == search_function) {
if (interp->codec_search_cache != NULL) {
assert(PyDict_CheckExact(interp->codec_search_cache));
PyDict_Clear(interp->codec_search_cache);
}
return PyList_SetSlice(codec_search_path, i, i+1, NULL);
}
}
return 0;
}
extern int _Py_normalize_encoding(const char *, char *, size_t);
/* Convert a string to a normalized Python string(decoded from UTF-8): all characters are