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cpython/Python/preconfig.c

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#include "Python.h"
#include "pycore_coreconfig.h"
#include "pycore_getopt.h"
#include "pycore_pystate.h" /* _PyRuntime_Initialize() */
#include <locale.h> /* setlocale() */
#define DECODE_LOCALE_ERR(NAME, LEN) \
(((LEN) == -2) \
? _Py_INIT_ERR("cannot decode " NAME) \
: _Py_INIT_NO_MEMORY())
/* --- File system encoding/errors -------------------------------- */
/* The filesystem encoding is chosen by config_init_fs_encoding(),
see also initfsencoding().
Py_FileSystemDefaultEncoding and Py_FileSystemDefaultEncodeErrors
are encoded to UTF-8. */
const char *Py_FileSystemDefaultEncoding = NULL;
int Py_HasFileSystemDefaultEncoding = 0;
const char *Py_FileSystemDefaultEncodeErrors = NULL;
int _Py_HasFileSystemDefaultEncodeErrors = 0;
void
_Py_ClearFileSystemEncoding(void)
{
if (!Py_HasFileSystemDefaultEncoding && Py_FileSystemDefaultEncoding) {
PyMem_RawFree((char*)Py_FileSystemDefaultEncoding);
Py_FileSystemDefaultEncoding = NULL;
}
if (!_Py_HasFileSystemDefaultEncodeErrors && Py_FileSystemDefaultEncodeErrors) {
PyMem_RawFree((char*)Py_FileSystemDefaultEncodeErrors);
Py_FileSystemDefaultEncodeErrors = NULL;
}
}
/* Set Py_FileSystemDefaultEncoding and Py_FileSystemDefaultEncodeErrors
global configuration variables. */
int
_Py_SetFileSystemEncoding(const char *encoding, const char *errors)
{
char *encoding2 = _PyMem_RawStrdup(encoding);
if (encoding2 == NULL) {
return -1;
}
char *errors2 = _PyMem_RawStrdup(errors);
if (errors2 == NULL) {
PyMem_RawFree(encoding2);
return -1;
}
_Py_ClearFileSystemEncoding();
Py_FileSystemDefaultEncoding = encoding2;
Py_HasFileSystemDefaultEncoding = 0;
Py_FileSystemDefaultEncodeErrors = errors2;
_Py_HasFileSystemDefaultEncodeErrors = 0;
return 0;
}
/* --- _PyArgv ---------------------------------------------------- */
/* Decode bytes_argv using Py_DecodeLocale() */
_PyInitError
_PyArgv_AsWstrList(const _PyArgv *args, _PyWstrList *list)
{
_PyWstrList wargv = _PyWstrList_INIT;
if (args->use_bytes_argv) {
size_t size = sizeof(wchar_t*) * args->argc;
wargv.items = (wchar_t **)PyMem_RawMalloc(size);
if (wargv.items == NULL) {
return _Py_INIT_NO_MEMORY();
}
for (Py_ssize_t i = 0; i < args->argc; i++) {
size_t len;
wchar_t *arg = Py_DecodeLocale(args->bytes_argv[i], &len);
if (arg == NULL) {
_PyWstrList_Clear(&wargv);
return DECODE_LOCALE_ERR("command line arguments",
(Py_ssize_t)len);
}
wargv.items[i] = arg;
wargv.length++;
}
_PyWstrList_Clear(list);
*list = wargv;
}
else {
wargv.length = args->argc;
wargv.items = (wchar_t **)args->wchar_argv;
if (_PyWstrList_Copy(list, &wargv) < 0) {
return _Py_INIT_NO_MEMORY();
}
}
return _Py_INIT_OK();
}
/* --- _PyPreCmdline ------------------------------------------------- */
void
_PyPreCmdline_Clear(_PyPreCmdline *cmdline)
{
_PyWstrList_Clear(&cmdline->argv);
_PyWstrList_Clear(&cmdline->xoptions);
}
_PyInitError
_PyPreCmdline_SetArgv(_PyPreCmdline *cmdline, const _PyArgv *args)
{
return _PyArgv_AsWstrList(args, &cmdline->argv);
}
static void
_PyPreCmdline_GetPreConfig(_PyPreCmdline *cmdline, const _PyPreConfig *config)
{
#define COPY_ATTR(ATTR) \
if (config->ATTR != -1) { \
cmdline->ATTR = config->ATTR; \
}
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
#undef COPY_ATTR
}
static void
_PyPreCmdline_SetPreConfig(const _PyPreCmdline *cmdline, _PyPreConfig *config)
{
#define COPY_ATTR(ATTR) \
config->ATTR = cmdline->ATTR
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
#undef COPY_ATTR
}
int
_PyPreCmdline_SetCoreConfig(const _PyPreCmdline *cmdline, _PyCoreConfig *config)
{
#define COPY_ATTR(ATTR) \
config->ATTR = cmdline->ATTR
if (_PyWstrList_Extend(&config->xoptions, &cmdline->xoptions) < 0) {
return -1;
}
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
return 0;
#undef COPY_ATTR
}
/* Parse the command line arguments */
static _PyInitError
precmdline_parse_cmdline(_PyPreCmdline *cmdline)
{
const _PyWstrList *argv = &cmdline->argv;
_PyOS_ResetGetOpt();
/* Don't log parsing errors into stderr here: _PyCoreConfig_Read()
is responsible for that */
_PyOS_opterr = 0;
do {
int longindex = -1;
int c = _PyOS_GetOpt(argv->length, argv->items, &longindex);
if (c == EOF || c == 'c' || c == 'm') {
break;
}
switch (c) {
case 'E':
cmdline->use_environment = 0;
break;
case 'I':
cmdline->isolated = 1;
break;
case 'X':
{
if (_PyWstrList_Append(&cmdline->xoptions, _PyOS_optarg) < 0) {
return _Py_INIT_NO_MEMORY();
}
break;
}
default:
/* ignore other argument:
handled by _PyCoreConfig_Read() */
break;
}
} while (1);
return _Py_INIT_OK();
}
_PyInitError
_PyPreCmdline_Read(_PyPreCmdline *cmdline, const _PyPreConfig *preconfig)
{
_PyPreCmdline_GetPreConfig(cmdline, preconfig);
if (preconfig->parse_argv) {
_PyInitError err = precmdline_parse_cmdline(cmdline);
if (_Py_INIT_FAILED(err)) {
return err;
}
}
/* isolated, use_environment */
if (cmdline->isolated < 0) {
cmdline->isolated = 0;
}
if (cmdline->isolated > 0) {
cmdline->use_environment = 0;
}
if (cmdline->use_environment < 0) {
cmdline->use_environment = 0;
}
/* dev_mode */
if ((cmdline->dev_mode < 0)
&& (_Py_get_xoption(&cmdline->xoptions, L"dev")
|| _Py_GetEnv(cmdline->use_environment, "PYTHONDEVMODE")))
{
cmdline->dev_mode = 1;
}
if (cmdline->dev_mode < 0) {
cmdline->dev_mode = 0;
}
assert(cmdline->use_environment >= 0);
assert(cmdline->isolated >= 0);
assert(cmdline->dev_mode >= 0);
return _Py_INIT_OK();
}
/* --- _PyPreConfig ----------------------------------------------- */
void
_PyPreConfig_InitCompatConfig(_PyPreConfig *config)
{
memset(config, 0, sizeof(*config));
config->_config_version = _Py_CONFIG_VERSION;
config->_config_init = (int)_PyConfig_INIT_COMPAT;
config->parse_argv = 0;
config->isolated = -1;
config->use_environment = -1;
config->configure_locale = 1;
config->utf8_mode = -1;
config->dev_mode = -1;
config->allocator = PYMEM_ALLOCATOR_NOT_SET;
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = -1;
#endif
}
void
_PyPreConfig_InitPythonConfig(_PyPreConfig *config)
{
_PyPreConfig_InitCompatConfig(config);
config->_config_init = (int)_PyConfig_INIT_PYTHON;
config->isolated = 0;
config->parse_argv = 1;
config->use_environment = 1;
/* Set to -1 to enable C locale coercion (PEP 538) and UTF-8 Mode (PEP 540)
depending on the LC_CTYPE locale, PYTHONUTF8 and PYTHONCOERCECLOCALE
environment variables. */
config->coerce_c_locale = -1;
config->coerce_c_locale_warn = -1;
config->utf8_mode = -1;
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = 0;
#endif
}
void
_PyPreConfig_InitIsolatedConfig(_PyPreConfig *config)
{
_PyPreConfig_InitCompatConfig(config);
config->_config_init = (int)_PyConfig_INIT_ISOLATED;
config->configure_locale = 0;
config->isolated = 1;
config->use_environment = 0;
config->utf8_mode = 0;
config->dev_mode = 0;
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = 0;
#endif
}
void
_PyPreConfig_InitFromPreConfig(_PyPreConfig *config,
const _PyPreConfig *config2)
{
_PyPreConfig_InitCompatConfig(config);
_PyPreConfig_Copy(config, config2);
}
void
_PyPreConfig_InitFromCoreConfig(_PyPreConfig *config,
const _PyCoreConfig *coreconfig)
{
_PyConfigInitEnum config_init = (_PyConfigInitEnum)coreconfig->_config_init;
switch (config_init) {
case _PyConfig_INIT_PYTHON:
_PyPreConfig_InitPythonConfig(config);
break;
case _PyConfig_INIT_ISOLATED:
_PyPreConfig_InitIsolatedConfig(config);
break;
case _PyConfig_INIT_COMPAT:
default:
_PyPreConfig_InitCompatConfig(config);
}
_PyPreConfig_GetCoreConfig(config, coreconfig);
}
void
_PyPreConfig_Copy(_PyPreConfig *config, const _PyPreConfig *config2)
{
#define COPY_ATTR(ATTR) config->ATTR = config2->ATTR
COPY_ATTR(parse_argv);
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(configure_locale);
COPY_ATTR(dev_mode);
COPY_ATTR(coerce_c_locale);
COPY_ATTR(coerce_c_locale_warn);
COPY_ATTR(utf8_mode);
COPY_ATTR(allocator);
#ifdef MS_WINDOWS
COPY_ATTR(legacy_windows_fs_encoding);
#endif
#undef COPY_ATTR
}
PyObject*
_PyPreConfig_AsDict(const _PyPreConfig *config)
{
PyObject *dict;
dict = PyDict_New();
if (dict == NULL) {
return NULL;
}
#define SET_ITEM_INT(ATTR) \
do { \
PyObject *obj = PyLong_FromLong(config->ATTR); \
if (obj == NULL) { \
goto fail; \
} \
int res = PyDict_SetItemString(dict, #ATTR, obj); \
Py_DECREF(obj); \
if (res < 0) { \
goto fail; \
} \
} while (0)
SET_ITEM_INT(parse_argv);
SET_ITEM_INT(isolated);
SET_ITEM_INT(use_environment);
SET_ITEM_INT(configure_locale);
SET_ITEM_INT(coerce_c_locale);
SET_ITEM_INT(coerce_c_locale_warn);
SET_ITEM_INT(utf8_mode);
#ifdef MS_WINDOWS
SET_ITEM_INT(legacy_windows_fs_encoding);
#endif
SET_ITEM_INT(dev_mode);
SET_ITEM_INT(allocator);
return dict;
fail:
Py_DECREF(dict);
return NULL;
#undef SET_ITEM_INT
}
void
_PyPreConfig_GetCoreConfig(_PyPreConfig *config,
const _PyCoreConfig *core_config)
{
#define COPY_ATTR(ATTR) \
if (core_config->ATTR != -1) { \
config->ATTR = core_config->ATTR; \
}
COPY_ATTR(parse_argv);
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
#undef COPY_ATTR
}
static void
_PyPreConfig_GetGlobalConfig(_PyPreConfig *config)
{
if (config->_config_init != _PyConfig_INIT_COMPAT) {
/* Python and Isolated configuration ignore global variables */
return;
}
#define COPY_FLAG(ATTR, VALUE) \
if (config->ATTR < 0) { \
config->ATTR = VALUE; \
}
#define COPY_NOT_FLAG(ATTR, VALUE) \
if (config->ATTR < 0) { \
config->ATTR = !(VALUE); \
}
COPY_FLAG(isolated, Py_IsolatedFlag);
COPY_NOT_FLAG(use_environment, Py_IgnoreEnvironmentFlag);
COPY_FLAG(utf8_mode, Py_UTF8Mode);
#ifdef MS_WINDOWS
COPY_FLAG(legacy_windows_fs_encoding, Py_LegacyWindowsFSEncodingFlag);
#endif
#undef COPY_FLAG
#undef COPY_NOT_FLAG
}
static void
_PyPreConfig_SetGlobalConfig(const _PyPreConfig *config)
{
#define COPY_FLAG(ATTR, VAR) \
if (config->ATTR >= 0) { \
VAR = config->ATTR; \
}
#define COPY_NOT_FLAG(ATTR, VAR) \
if (config->ATTR >= 0) { \
VAR = !config->ATTR; \
}
COPY_FLAG(isolated, Py_IsolatedFlag);
COPY_NOT_FLAG(use_environment, Py_IgnoreEnvironmentFlag);
#ifdef MS_WINDOWS
COPY_FLAG(legacy_windows_fs_encoding, Py_LegacyWindowsFSEncodingFlag);
#endif
COPY_FLAG(utf8_mode, Py_UTF8Mode);
#undef COPY_FLAG
#undef COPY_NOT_FLAG
}
const char*
_Py_GetEnv(int use_environment, const char *name)
{
assert(use_environment >= 0);
if (!use_environment) {
return NULL;
}
const char *var = getenv(name);
if (var && var[0] != '\0') {
return var;
}
else {
return NULL;
}
}
int
_Py_str_to_int(const char *str, int *result)
{
const char *endptr = str;
errno = 0;
long value = strtol(str, (char **)&endptr, 10);
if (*endptr != '\0' || errno == ERANGE) {
return -1;
}
if (value < INT_MIN || value > INT_MAX) {
return -1;
}
*result = (int)value;
return 0;
}
void
_Py_get_env_flag(int use_environment, int *flag, const char *name)
{
const char *var = _Py_GetEnv(use_environment, name);
if (!var) {
return;
}
int value;
if (_Py_str_to_int(var, &value) < 0 || value < 0) {
/* PYTHONDEBUG=text and PYTHONDEBUG=-2 behave as PYTHONDEBUG=1 */
value = 1;
}
if (*flag < value) {
*flag = value;
}
}
const wchar_t*
_Py_get_xoption(const _PyWstrList *xoptions, const wchar_t *name)
{
for (Py_ssize_t i=0; i < xoptions->length; i++) {
const wchar_t *option = xoptions->items[i];
size_t len;
wchar_t *sep = wcschr(option, L'=');
if (sep != NULL) {
len = (sep - option);
}
else {
len = wcslen(option);
}
if (wcsncmp(option, name, len) == 0 && name[len] == L'\0') {
return option;
}
}
return NULL;
}
static _PyInitError
preconfig_init_utf8_mode(_PyPreConfig *config, const _PyPreCmdline *cmdline)
{
#ifdef MS_WINDOWS
if (config->legacy_windows_fs_encoding) {
config->utf8_mode = 0;
}
#endif
if (config->utf8_mode >= 0) {
return _Py_INIT_OK();
}
const wchar_t *xopt;
xopt = _Py_get_xoption(&cmdline->xoptions, L"utf8");
if (xopt) {
wchar_t *sep = wcschr(xopt, L'=');
if (sep) {
xopt = sep + 1;
if (wcscmp(xopt, L"1") == 0) {
config->utf8_mode = 1;
}
else if (wcscmp(xopt, L"0") == 0) {
config->utf8_mode = 0;
}
else {
return _Py_INIT_ERR("invalid -X utf8 option value");
}
}
else {
config->utf8_mode = 1;
}
return _Py_INIT_OK();
}
const char *opt = _Py_GetEnv(config->use_environment, "PYTHONUTF8");
if (opt) {
if (strcmp(opt, "1") == 0) {
config->utf8_mode = 1;
}
else if (strcmp(opt, "0") == 0) {
config->utf8_mode = 0;
}
else {
return _Py_INIT_ERR("invalid PYTHONUTF8 environment "
"variable value");
}
return _Py_INIT_OK();
}
#ifndef MS_WINDOWS
if (config->utf8_mode < 0) {
/* The C locale and the POSIX locale enable the UTF-8 Mode (PEP 540) */
const char *ctype_loc = setlocale(LC_CTYPE, NULL);
if (ctype_loc != NULL
&& (strcmp(ctype_loc, "C") == 0
|| strcmp(ctype_loc, "POSIX") == 0))
{
config->utf8_mode = 1;
}
}
#endif
if (config->utf8_mode < 0) {
config->utf8_mode = 0;
}
return _Py_INIT_OK();
}
static void
preconfig_init_coerce_c_locale(_PyPreConfig *config)
{
if (!config->configure_locale) {
config->coerce_c_locale = 0;
config->coerce_c_locale_warn = 0;
return;
}
const char *env = _Py_GetEnv(config->use_environment, "PYTHONCOERCECLOCALE");
if (env) {
if (strcmp(env, "0") == 0) {
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 0;
}
}
else if (strcmp(env, "warn") == 0) {
if (config->coerce_c_locale_warn < 0) {
config->coerce_c_locale_warn = 1;
}
}
else {
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 1;
}
}
}
/* Test if coerce_c_locale equals to -1 or equals to 1:
PYTHONCOERCECLOCALE=1 doesn't imply that the C locale is always coerced.
It is only coerced if if the LC_CTYPE locale is "C". */
if (config->coerce_c_locale < 0 || config->coerce_c_locale == 1) {
/* The C locale enables the C locale coercion (PEP 538) */
if (_Py_LegacyLocaleDetected(0)) {
config->coerce_c_locale = 2;
}
else {
config->coerce_c_locale = 0;
}
}
if (config->coerce_c_locale_warn < 0) {
config->coerce_c_locale_warn = 0;
}
}
static _PyInitError
preconfig_init_allocator(_PyPreConfig *config)
{
if (config->allocator == PYMEM_ALLOCATOR_NOT_SET) {
/* bpo-34247. The PYTHONMALLOC environment variable has the priority
over PYTHONDEV env var and "-X dev" command line option.
For example, PYTHONMALLOC=malloc PYTHONDEVMODE=1 sets the memory
allocators to "malloc" (and not to "debug"). */
const char *envvar = _Py_GetEnv(config->use_environment, "PYTHONMALLOC");
if (envvar) {
PyMemAllocatorName name;
if (_PyMem_GetAllocatorName(envvar, &name) < 0) {
return _Py_INIT_ERR("PYTHONMALLOC: unknown allocator");
}
config->allocator = (int)name;
}
}
if (config->dev_mode && config->allocator == PYMEM_ALLOCATOR_NOT_SET) {
config->allocator = PYMEM_ALLOCATOR_DEBUG;
}
return _Py_INIT_OK();
}
static _PyInitError
preconfig_read(_PyPreConfig *config, _PyPreCmdline *cmdline)
{
_PyInitError err;
err = _PyPreCmdline_Read(cmdline, config);
if (_Py_INIT_FAILED(err)) {
return err;
}
_PyPreCmdline_SetPreConfig(cmdline, config);
/* legacy_windows_fs_encoding, coerce_c_locale, utf8_mode */
#ifdef MS_WINDOWS
_Py_get_env_flag(config->use_environment,
&config->legacy_windows_fs_encoding,
"PYTHONLEGACYWINDOWSFSENCODING");
#endif
preconfig_init_coerce_c_locale(config);
err = preconfig_init_utf8_mode(config, cmdline);
if (_Py_INIT_FAILED(err)) {
return err;
}
/* allocator */
err = preconfig_init_allocator(config);
if (_Py_INIT_FAILED(err)) {
return err;
}
assert(config->coerce_c_locale >= 0);
assert(config->coerce_c_locale_warn >= 0);
#ifdef MS_WINDOWS
assert(config->legacy_windows_fs_encoding >= 0);
#endif
assert(config->utf8_mode >= 0);
assert(config->isolated >= 0);
assert(config->use_environment >= 0);
assert(config->dev_mode >= 0);
return _Py_INIT_OK();
}
/* Read the configuration from:
- command line arguments
- environment variables
- Py_xxx global configuration variables
- the LC_CTYPE locale */
_PyInitError
_PyPreConfig_Read(_PyPreConfig *config, const _PyArgv *args)
{
_PyInitError err;
err = _PyRuntime_Initialize();
if (_Py_INIT_FAILED(err)) {
return err;
}
_PyPreConfig_GetGlobalConfig(config);
/* Copy LC_CTYPE locale, since it's modified later */
const char *loc = setlocale(LC_CTYPE, NULL);
if (loc == NULL) {
return _Py_INIT_ERR("failed to LC_CTYPE locale");
}
char *init_ctype_locale = _PyMem_RawStrdup(loc);
if (init_ctype_locale == NULL) {
return _Py_INIT_NO_MEMORY();
}
/* Save the config to be able to restore it if encodings change */
_PyPreConfig save_config;
_PyPreConfig_InitFromPreConfig(&save_config, config);
/* Set LC_CTYPE to the user preferred locale */
if (config->configure_locale) {
_Py_SetLocaleFromEnv(LC_CTYPE);
}
_PyPreCmdline cmdline = _PyPreCmdline_INIT;
int init_utf8_mode = Py_UTF8Mode;
#ifdef MS_WINDOWS
int init_legacy_encoding = Py_LegacyWindowsFSEncodingFlag;
#endif
if (args) {
err = _PyPreCmdline_SetArgv(&cmdline, args);
if (_Py_INIT_FAILED(err)) {
goto done;
}
}
int locale_coerced = 0;
int loops = 0;
while (1) {
int utf8_mode = config->utf8_mode;
/* Watchdog to prevent an infinite loop */
loops++;
if (loops == 3) {
err = _Py_INIT_ERR("Encoding changed twice while "
"reading the configuration");
goto done;
}
/* bpo-34207: Py_DecodeLocale() and Py_EncodeLocale() depend
on Py_UTF8Mode and Py_LegacyWindowsFSEncodingFlag. */
Py_UTF8Mode = config->utf8_mode;
#ifdef MS_WINDOWS
Py_LegacyWindowsFSEncodingFlag = config->legacy_windows_fs_encoding;
#endif
err = preconfig_read(config, &cmdline);
if (_Py_INIT_FAILED(err)) {
goto done;
}
/* The legacy C locale assumes ASCII as the default text encoding, which
* causes problems not only for the CPython runtime, but also other
* components like GNU readline.
*
* Accordingly, when the CLI detects it, it attempts to coerce it to a
* more capable UTF-8 based alternative.
*
* See the documentation of the PYTHONCOERCECLOCALE setting for more
* details.
*/
int encoding_changed = 0;
if (config->coerce_c_locale && !locale_coerced) {
locale_coerced = 1;
_Py_CoerceLegacyLocale(0);
encoding_changed = 1;
}
if (utf8_mode == -1) {
if (config->utf8_mode == 1) {
/* UTF-8 Mode enabled */
encoding_changed = 1;
}
}
else {
if (config->utf8_mode != utf8_mode) {
encoding_changed = 1;
}
}
if (!encoding_changed) {
break;
}
/* Reset the configuration before reading again the configuration,
just keep UTF-8 Mode value. */
int new_utf8_mode = config->utf8_mode;
int new_coerce_c_locale = config->coerce_c_locale;
_PyPreConfig_Copy(config, &save_config);
config->utf8_mode = new_utf8_mode;
config->coerce_c_locale = new_coerce_c_locale;
/* The encoding changed: read again the configuration
with the new encoding */
}
err = _Py_INIT_OK();
done:
if (init_ctype_locale != NULL) {
setlocale(LC_CTYPE, init_ctype_locale);
PyMem_RawFree(init_ctype_locale);
}
Py_UTF8Mode = init_utf8_mode ;
#ifdef MS_WINDOWS
Py_LegacyWindowsFSEncodingFlag = init_legacy_encoding;
#endif
_PyPreCmdline_Clear(&cmdline);
return err;
}
/* Write the pre-configuration:
- set the memory allocators
- set Py_xxx global configuration variables
- set the LC_CTYPE locale (coerce C locale, PEP 538) and set the UTF-8 mode
(PEP 540)
The applied configuration is written into _PyRuntime.preconfig.
If the C locale cannot be coerced, set coerce_c_locale to 0.
Do nothing if called after Py_Initialize(): ignore the new
pre-configuration. */
_PyInitError
_PyPreConfig_Write(const _PyPreConfig *src_config)
{
_PyPreConfig config;
_PyPreConfig_InitFromPreConfig(&config, src_config);
if (_PyRuntime.core_initialized) {
/* bpo-34008: Calling this functions after Py_Initialize() ignores
the new configuration. */
return _Py_INIT_OK();
}
PyMemAllocatorName name = (PyMemAllocatorName)config.allocator;
if (name != PYMEM_ALLOCATOR_NOT_SET) {
if (_PyMem_SetupAllocators(name) < 0) {
return _Py_INIT_ERR("Unknown PYTHONMALLOC allocator");
}
}
_PyPreConfig_SetGlobalConfig(&config);
if (config.configure_locale) {
if (config.coerce_c_locale) {
if (!_Py_CoerceLegacyLocale(config.coerce_c_locale_warn)) {
/* C locale not coerced */
config.coerce_c_locale = 0;
}
}
/* Set LC_CTYPE to the user preferred locale */
_Py_SetLocaleFromEnv(LC_CTYPE);
}
/* Write the new pre-configuration into _PyRuntime */
_PyPreConfig_Copy(&_PyRuntime.preconfig, &config);
return _Py_INIT_OK();
}
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