STINNER Victor <[email protected]> added the comment:
The "vim" editor embeds Python. It sets the Python home by calling
Py_SetPythonHome() with the following code:
---
size_t len = mbstowcs(NULL, (char *)p_py3home, 0) + 1;
/* The string must not change later, make a copy in static memory.
*/
py_home_buf = (wchar_t *)alloc(len * sizeof(wchar_t));
if (py_home_buf != NULL && mbstowcs(
py_home_buf, (char *)p_py3home, len) != (size_t)-1)
Py_SetPythonHome(py_home_buf);
---
ref:
https://github.com/vim/vim/blob/14816ad6e58336773443f5ee2e4aa9e384af65d2/src/if_python3.c#L874-L887
mbstowcs() uses the current LC_CTYPE locale. Python can select a different
filesystem encoding than the LC_CTYPE encoding depending on PEP 538 and PEP
540. So encoding back the Python home to bytes to access to files on the
filesystem can fail because of mojibake.
The code should by written like (pseudo-code):
---
_Py_PreInitialize();
_PyCoreConfig config;
config.home = Py_DecodeLocale(p_py3home);
if (config.home == NULL) { /* ERROR */ }
_PyInitError err = _Py_InitializeFromConfig(&config);
if (_Py_INIT_FAILED(err)) {
_PyCoreConfig_Clear(&config);
_Py_ExitInitError(err);
}
---
The vim case has been discussed at:
https://discuss.python.org/t/adding-char-based-apis-for-unix/916/8
----------
nosy: +inada.naoki
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<https://bugs.python.org/issue36202>
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