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gh-86179: Implement realpath() on Windows for getpath.py calculations (GH-113033)

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Steve Dower 2023-12-13 23:41:43 +00:00 • committed by GitHub
parent 41c18aacc7
commit fddc829236
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4 changed files with 63 additions and 11 deletions
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39
Modules/getpath.c
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@ -502,6 +502,45 @@ done:
PyMem_Free((void *)path);
PyMem_Free((void *)narrow);
return r;
#elif defined(MS_WINDOWS)
HANDLE hFile;
wchar_t resolved[MAXPATHLEN+1];
int len = 0, err;
PyObject *result;
wchar_t *path = PyUnicode_AsWideCharString(pathobj, NULL);
if (!path) {
return NULL;
}
Py_BEGIN_ALLOW_THREADS
hFile = CreateFileW(path, 0, 0, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hFile != INVALID_HANDLE_VALUE) {
len = GetFinalPathNameByHandleW(hFile, resolved, MAXPATHLEN, VOLUME_NAME_DOS);
err = len ? 0 : GetLastError();
CloseHandle(hFile);
} else {
err = GetLastError();
}
Py_END_ALLOW_THREADS
if (err) {
PyErr_SetFromWindowsErr(err);
result = NULL;
} else if (len <= MAXPATHLEN) {
const wchar_t *p = resolved;
if (0 == wcsncmp(p, L"\\\\?\\", 4)) {
if (GetFileAttributesW(&p[4]) != INVALID_FILE_ATTRIBUTES) {
p += 4;
len -= 4;
}
}
result = PyUnicode_FromWideChar(p, len);
} else {
result = Py_NewRef(pathobj);
}
PyMem_Free(path);
return result;
#endif
return Py_NewRef(pathobj);