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gh-94526: getpath_dirname() no longer encodes the path by vstinner · Pull Request #97645 · python/cpython · GitHub

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gh-94526: getpath_dirname() no longer encodes the path #97645

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Merged
vstinner merged 1 commit into from
Sep 30, 2022
Conversation 14 Commits 1 Checks 0 Files changed
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gh-94526: getpath_dirname() no longer encodes the path #97645

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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2022-09-29-15-19-29.gh-issue-94526.wq5m6T.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Fix the Python path configuration used to initialized :data:`sys.path` at
Python startup. Paths are no longer encoded to UTF-8/strict to avoid encoding
errors if it contains surrogate characters (bytes paths are decoded with the
surrogateescape error handler). Patch by Victor Stinner.
23 changes: 14 additions & 9 deletions Modules/getpath.c
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Original file line number Diff line number Diff line change
Expand Up @@ -82,27 +82,32 @@ getpath_abspath(PyObject *Py_UNUSED(self), PyObject *args)
static PyObject *
getpath_basename(PyObject *Py_UNUSED(self), PyObject *args)
{
const char *path;
if (!PyArg_ParseTuple(args, "s", &path)) {
PyObject *path;
if (!PyArg_ParseTuple(args, "U", &path)) {

serhiy-storchaka Sep 29, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

BTW, I would use METH_O and PyArg_Parse() in these functions, but this is another issue.

Why cannot they be implemented in Python?

vstinner Sep 29, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

BTW, I would use METH_O and PyArg_Parse() in these functions, but this is another issue.

I tried to minimize the changes.

Why cannot they be implemented in Python?

Ask @zooba who designed this. Maybe it can be changed?

zooba Sep 29, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Perf, mostly. These trivial ones probably could be, but don't fall into the trap of trying to port the full ntpath/posixpath implementations into getpath - we don't have a lot of the functionality needed to handle those at this stage (e.g. no codecs, no os module).
return NULL;
}
const char *name = strrchr(path, SEP);
return PyUnicode_FromString(name ? name + 1 : path);
Py_ssize_t end = PyUnicode_GET_LENGTH(path);
Py_ssize_t pos = PyUnicode_FindChar(path, SEP, 0, end, -1);
if (pos < 0) {
return Py_NewRef(path);
}
return PyUnicode_Substring(path, pos + 1, end);
}


static PyObject *
getpath_dirname(PyObject *Py_UNUSED(self), PyObject *args)
{
const char *path;
if (!PyArg_ParseTuple(args, "s", &path)) {
PyObject *path;
if (!PyArg_ParseTuple(args, "U", &path)) {
return NULL;
}
const char *name = strrchr(path, SEP);
if (!name) {
Py_ssize_t end = PyUnicode_GET_LENGTH(path);
Py_ssize_t pos = PyUnicode_FindChar(path, SEP, 0, end, -1);
if (pos < 0) {
return PyUnicode_FromStringAndSize(NULL, 0);
}
return PyUnicode_FromStringAndSize(path, (name - path));
return PyUnicode_Substring(path, 0, pos);
}


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