bpo-45506: Normalize _PyPathConfig.stdlib_dir when calculated. (#29040)

The recently added PyConfig.stdlib_dir was being set with ".." entries. When __file__ was added for from modules this caused a problem on out-of-tree builds. This PR fixes that by normalizing "stdlib_dir" when it is calculated in getpath.c.

https://bugs.python.org/issue45506

1 files changed, 24 insertions, 0 deletions

diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
index 1ca0606..1f205b8 100644
--- a/Modules/_testinternalcapi.c
+++ b/Modules/_testinternalcapi.c
@@ -14,12 +14,14 @@
 #include "Python.h"
 #include "pycore_atomic_funcs.h" // _Py_atomic_int_get()
 #include "pycore_bitutils.h"     // _Py_bswap32()
+#include "pycore_fileutils.h"    // _Py_normalize_path
 #include "pycore_gc.h"           // PyGC_Head
 #include "pycore_hashtable.h"    // _Py_hashtable_new()
 #include "pycore_initconfig.h"   // _Py_GetConfigsAsDict()
 #include "pycore_interp.h"       // _PyInterpreterState_GetConfigCopy()
 #include "pycore_pyerrors.h"     // _Py_UTF8_Edit_Cost()
 #include "pycore_pystate.h"      // _PyThreadState_GET()
+#include "osdefs.h"               // MAXPATHLEN
 
 
 static PyObject *
@@ -366,6 +368,27 @@ test_edit_cost(PyObject *self, PyObject *Py_UNUSED(args))
 }
 
 
+static PyObject *
+normalize_path(PyObject *self, PyObject *filename)
+{
+    Py_ssize_t size = -1;
+    wchar_t *encoded = PyUnicode_AsWideCharString(filename, &size);
+    if (encoded == NULL) {
+        return NULL;
+    }
+
+    wchar_t buf[MAXPATHLEN + 1];
+    int res = _Py_normalize_path(encoded, buf, Py_ARRAY_LENGTH(buf));
+    PyMem_Free(encoded);
+    if (res != 0) {
+        PyErr_SetString(PyExc_ValueError, "string too long");
+        return NULL;
+    }
+
+    return PyUnicode_FromWideChar(buf, -1);
+}
+
+
 static PyMethodDef TestMethods[] = {
     {"get_configs", get_configs, METH_NOARGS},
     {"get_recursion_depth", get_recursion_depth, METH_NOARGS},
@@ -377,6 +400,7 @@ static PyMethodDef TestMethods[] = {
     {"set_config", test_set_config, METH_O},
     {"test_atomic_funcs", test_atomic_funcs, METH_NOARGS},
     {"test_edit_cost", test_edit_cost, METH_NOARGS},
+    {"normalize_path", normalize_path, METH_O, NULL},
     {NULL, NULL} /* sentinel */
 };