#include "Python.h"
#include "pycore_fileutils.h"
#include "osdefs.h"
#include <locale.h>

#ifdef MS_WINDOWS
# include <malloc.h>
# include <windows.h>
extern int winerror_to_errno(int);
#endif

#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */

#ifdef O_CLOEXEC
/* Does open() support the O_CLOEXEC flag? Possible values:

 -1: unknown
 0: open() ignores O_CLOEXEC flag, ex: Linux kernel older than 2.6.23
 1: open() supports O_CLOEXEC flag, close-on-exec is set

 The flag is used by _Py_open(), _Py_open_noraise(), io.FileIO
 and os.open(). */
int _Py_open_cloexec_works = -1;
#endif

// The value must be the same in unicodeobject.c.
#define MAX_UNICODE 0x10ffff

// mbstowcs() and mbrtowc() errors
static const size_t DECODE_ERROR = ((size_t)-1);
static const size_t INCOMPLETE_CHARACTER = (size_t)-2;


static int
get_surrogateescape(_Py_error_handler errors, int *surrogateescape)
{
 switch (errors)
 {
 case _Py_ERROR_STRICT:
 *surrogateescape = 0;
 return 0;
 case _Py_ERROR_SURROGATEESCAPE:
 *surrogateescape = 1;
 return 0;
 default:
 return -1;
 }
}


PyObject *
_Py_device_encoding(int fd)
{
#if defined(MS_WINDOWS)
 UINT cp;
#endif
 int valid;
 _Py_BEGIN_SUPPRESS_IPH
 valid = isatty(fd);
 _Py_END_SUPPRESS_IPH
 if (!valid)
 Py_RETURN_NONE;

#if defined(MS_WINDOWS)
 if (fd == 0)
 cp = GetConsoleCP();
 else if (fd == 1 || fd == 2)
 cp = GetConsoleOutputCP();
 else
 cp = 0;
 /* GetConsoleCP() and GetConsoleOutputCP() return 0 if the application
 has no console */
 if (cp != 0)
 return PyUnicode_FromFormat("cp%u", (unsigned int)cp);
#elif defined(CODESET)
 {
 char *codeset = nl_langinfo(CODESET);
 if (codeset != NULL && codeset[0] != 0)
 return PyUnicode_FromString(codeset);
 }
#endif
 Py_RETURN_NONE;
}


static size_t
is_valid_wide_char(wchar_t ch)
{
 if (Py_UNICODE_IS_SURROGATE(ch)) {
 // Reject lone surrogate characters
 return 0;
 }
 if (ch > MAX_UNICODE) {
 // bpo-35883: Reject characters outside [U+0000; U+10ffff] range.
 // The glibc mbstowcs() UTF-8 decoder does not respect the RFC 3629,
 // it creates characters outside the [U+0000; U+10ffff] range:
 // https://sourceware.org/bugzilla/show_bug.cgi?id=2373
 return 0;
 }
 return 1;
}


static size_t
_Py_mbstowcs(wchar_t *dest, const char *src, size_t n)
{
 size_t count = mbstowcs(dest, src, n);
 if (dest != NULL && count != DECODE_ERROR) {
 for (size_t i=0; i < count; i++) {
 wchar_t ch = dest[i];
 if (!is_valid_wide_char(ch)) {
 return DECODE_ERROR;
 }
 }
 }
 return count;
}


#ifdef HAVE_MBRTOWC
static size_t
_Py_mbrtowc(wchar_t *pwc, const char *str, size_t len, mbstate_t *pmbs)
{
 assert(pwc != NULL);
 size_t count = mbrtowc(pwc, str, len, pmbs);
 if (count != 0 && count != DECODE_ERROR && count != INCOMPLETE_CHARACTER) {
 if (!is_valid_wide_char(*pwc)) {
 return DECODE_ERROR;
 }
 }
 return count;
}
#endif


#if !defined(_Py_FORCE_UTF8_FS_ENCODING) && !defined(MS_WINDOWS)

#define USE_FORCE_ASCII

extern int _Py_normalize_encoding(const char *, char *, size_t);

/* Workaround FreeBSD and OpenIndiana locale encoding issue with the C locale
 and POSIX locale. nl_langinfo(CODESET) announces an alias of the
 ASCII encoding, whereas mbstowcs() and wcstombs() functions use the
 ISO-8859-1 encoding. The problem is that os.fsencode() and os.fsdecode() use
 locale.getpreferredencoding() codec. For example, if command line arguments
 are decoded by mbstowcs() and encoded back by os.fsencode(), we get a
 UnicodeEncodeError instead of retrieving the original byte string.

 The workaround is enabled if setlocale(LC_CTYPE, NULL) returns "C",
 nl_langinfo(CODESET) announces "ascii" (or an alias to ASCII), and at least
 one byte in range 0x80-0xff can be decoded from the locale encoding. The
 workaround is also enabled on error, for example if getting the locale
 failed.

 On HP-UX with the C locale or the POSIX locale, nl_langinfo(CODESET)
 announces "roman8" but mbstowcs() uses Latin1 in practice. Force also the
 ASCII encoding in this case.

 Values of force_ascii:

 1: the workaround is used: Py_EncodeLocale() uses
 encode_ascii_surrogateescape() and Py_DecodeLocale() uses
 decode_ascii()
 0: the workaround is not used: Py_EncodeLocale() uses wcstombs() and
 Py_DecodeLocale() uses mbstowcs()
 -1: unknown, need to call check_force_ascii() to get the value
*/
static int force_ascii = -1;

static int
check_force_ascii(void)
{
 char *loc = setlocale(LC_CTYPE, NULL);
 if (loc == NULL) {
 goto error;
 }
 if (strcmp(loc, "C") != 0 && strcmp(loc, "POSIX") != 0) {
 /* the LC_CTYPE locale is different than C and POSIX */
 return 0;
 }

#if defined(HAVE_LANGINFO_H) && defined(CODESET)
 const char *codeset = nl_langinfo(CODESET);
 if (!codeset || codeset[0] == '0円') {
 /* CODESET is not set or empty */
 goto error;
 }

 char encoding[20]; /* longest name: "iso_646.irv_19910円" */
 if (!_Py_normalize_encoding(codeset, encoding, sizeof(encoding))) {
 goto error;
 }

#ifdef __hpux
 if (strcmp(encoding, "roman8") == 0) {
 unsigned char ch;
 wchar_t wch;
 size_t res;

 ch = (unsigned char)0xA7;
 res = _Py_mbstowcs(&wch, (char*)&ch, 1);
 if (res != DECODE_ERROR && wch == L'\xA7') {
 /* On HP-UX withe C locale or the POSIX locale,
 nl_langinfo(CODESET) announces "roman8", whereas mbstowcs() uses
 Latin1 encoding in practice. Force ASCII in this case.

 Roman8 decodes 0xA7 to U+00CF. Latin1 decodes 0xA7 to U+00A7. */
 return 1;
 }
 }
#else
 const char* ascii_aliases[] = {
 "ascii",
 /* Aliases from Lib/encodings/aliases.py */
 "646",
 "ansi_x3.4_1968",
 "ansi_x3.4_1986",
 "ansi_x3_4_1968",
 "cp367",
 "csascii",
 "ibm367",
 "iso646_us",
 "iso_646.irv_1991",
 "iso_ir_6",
 "us",
 "us_ascii",
 NULL
 };

 int is_ascii = 0;
 for (const char **alias=ascii_aliases; *alias != NULL; alias++) {
 if (strcmp(encoding, *alias) == 0) {
 is_ascii = 1;
 break;
 }
 }
 if (!is_ascii) {
 /* nl_langinfo(CODESET) is not "ascii" or an alias of ASCII */
 return 0;
 }

 for (unsigned int i=0x80; i<=0xff; i++) {
 char ch[1];
 wchar_t wch[1];
 size_t res;

 unsigned uch = (unsigned char)i;
 ch[0] = (char)uch;
 res = _Py_mbstowcs(wch, ch, 1);
 if (res != DECODE_ERROR) {
 /* decoding a non-ASCII character from the locale encoding succeed:
 the locale encoding is not ASCII, force ASCII */
 return 1;
 }
 }
 /* None of the bytes in the range 0x80-0xff can be decoded from the locale
 encoding: the locale encoding is really ASCII */
#endif /* !defined(__hpux) */
 return 0;
#else
 /* nl_langinfo(CODESET) is not available: always force ASCII */
 return 1;
#endif /* defined(HAVE_LANGINFO_H) && defined(CODESET) */

error:
 /* if an error occurred, force the ASCII encoding */
 return 1;
}


int
_Py_GetForceASCII(void)
{
 if (force_ascii == -1) {
 force_ascii = check_force_ascii();
 }
 return force_ascii;
}


void
_Py_ResetForceASCII(void)
{
 force_ascii = -1;
}


static int
encode_ascii(const wchar_t *text, char **str,
 size_t *error_pos, const char **reason,
 int raw_malloc, _Py_error_handler errors)
{
 char *result = NULL, *out;
 size_t len, i;
 wchar_t ch;

 int surrogateescape;
 if (get_surrogateescape(errors, &surrogateescape) < 0) {
 return -3;
 }

 len = wcslen(text);

 /* +1 for NULL byte */
 if (raw_malloc) {
 result = PyMem_RawMalloc(len + 1);
 }
 else {
 result = PyMem_Malloc(len + 1);
 }
 if (result == NULL) {
 return -1;
 }

 out = result;
 for (i=0; i<len; i++) {
 ch = text[i];

 if (ch <= 0x7f) {
 /* ASCII character */
 *out++ = (char)ch;
 }
 else if (surrogateescape && 0xdc80 <= ch && ch <= 0xdcff) {
 /* UTF-8b surrogate */
 *out++ = (char)(ch - 0xdc00);
 }
 else {
 if (raw_malloc) {
 PyMem_RawFree(result);
 }
 else {
 PyMem_Free(result);
 }
 if (error_pos != NULL) {
 *error_pos = i;
 }
 if (reason) {
 *reason = "encoding error";
 }
 return -2;
 }
 }
 *out = '0円';
 *str = result;
 return 0;
}
#else
int
_Py_GetForceASCII(void)
{
 return 0;
}

void
_Py_ResetForceASCII(void)
{
 /* nothing to do */
}
#endif /* !defined(_Py_FORCE_UTF8_FS_ENCODING) && !defined(MS_WINDOWS) */


#if !defined(HAVE_MBRTOWC) || defined(USE_FORCE_ASCII)
static int
decode_ascii(const char *arg, wchar_t **wstr, size_t *wlen,
 const char **reason, _Py_error_handler errors)
{
 wchar_t *res;
 unsigned char *in;
 wchar_t *out;
 size_t argsize = strlen(arg) + 1;

 int surrogateescape;
 if (get_surrogateescape(errors, &surrogateescape) < 0) {
 return -3;
 }

 if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t)) {
 return -1;
 }
 res = PyMem_RawMalloc(argsize * sizeof(wchar_t));
 if (!res) {
 return -1;
 }

 out = res;
 for (in = (unsigned char*)arg; *in; in++) {
 unsigned char ch = *in;
 if (ch < 128) {
 *out++ = ch;
 }
 else {
 if (!surrogateescape) {
 PyMem_RawFree(res);
 if (wlen) {
 *wlen = in - (unsigned char*)arg;
 }
 if (reason) {
 *reason = "decoding error";
 }
 return -2;
 }
 *out++ = 0xdc00 + ch;
 }
 }
 *out = 0;

 if (wlen != NULL) {
 *wlen = out - res;
 }
 *wstr = res;
 return 0;
}
#endif /* !HAVE_MBRTOWC */

static int
decode_current_locale(const char* arg, wchar_t **wstr, size_t *wlen,
 const char **reason, _Py_error_handler errors)
{
 wchar_t *res;
 size_t argsize;
 size_t count;
#ifdef HAVE_MBRTOWC
 unsigned char *in;
 wchar_t *out;
 mbstate_t mbs;
#endif

 int surrogateescape;
 if (get_surrogateescape(errors, &surrogateescape) < 0) {
 return -3;
 }

#ifdef HAVE_BROKEN_MBSTOWCS
 /* Some platforms have a broken implementation of
 * mbstowcs which does not count the characters that
 * would result from conversion. Use an upper bound.
 */
 argsize = strlen(arg);
#else
 argsize = _Py_mbstowcs(NULL, arg, 0);
#endif
 if (argsize != DECODE_ERROR) {
 if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t) - 1) {
 return -1;
 }
 res = (wchar_t *)PyMem_RawMalloc((argsize + 1) * sizeof(wchar_t));
 if (!res) {
 return -1;
 }

 count = _Py_mbstowcs(res, arg, argsize + 1);
 if (count != DECODE_ERROR) {
 *wstr = res;
 if (wlen != NULL) {
 *wlen = count;
 }
 return 0;
 }
 PyMem_RawFree(res);
 }

 /* Conversion failed. Fall back to escaping with surrogateescape. */
#ifdef HAVE_MBRTOWC
 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */

 /* Overallocate; as multi-byte characters are in the argument, the
 actual output could use less memory. */
 argsize = strlen(arg) + 1;
 if (argsize > PY_SSIZE_T_MAX / sizeof(wchar_t)) {
 return -1;
 }
 res = (wchar_t*)PyMem_RawMalloc(argsize * sizeof(wchar_t));
 if (!res) {
 return -1;
 }

 in = (unsigned char*)arg;
 out = res;
 memset(&mbs, 0, sizeof mbs);
 while (argsize) {
 size_t converted = _Py_mbrtowc(out, (char*)in, argsize, &mbs);
 if (converted == 0) {
 /* Reached end of string; null char stored. */
 break;
 }

 if (converted == INCOMPLETE_CHARACTER) {
 /* Incomplete character. This should never happen,
 since we provide everything that we have -
 unless there is a bug in the C library, or I
 misunderstood how mbrtowc works. */
 goto decode_error;
 }

 if (converted == DECODE_ERROR) {
 if (!surrogateescape) {
 goto decode_error;
 }

 /* Decoding error. Escape as UTF-8b, and start over in the initial
 shift state. */
 *out++ = 0xdc00 + *in++;
 argsize--;
 memset(&mbs, 0, sizeof mbs);
 continue;
 }

 // _Py_mbrtowc() reject lone surrogate characters
 assert(!Py_UNICODE_IS_SURROGATE(*out));

 /* successfully converted some bytes */
 in += converted;
 argsize -= converted;
 out++;
 }
 if (wlen != NULL) {
 *wlen = out - res;
 }
 *wstr = res;
 return 0;

decode_error:
 PyMem_RawFree(res);
 if (wlen) {
 *wlen = in - (unsigned char*)arg;
 }
 if (reason) {
 *reason = "decoding error";
 }
 return -2;
#else /* HAVE_MBRTOWC */
 /* Cannot use C locale for escaping; manually escape as if charset
 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
 correctly in the locale's charset, which must be an ASCII superset. */
 return decode_ascii(arg, wstr, wlen, reason, errors);
#endif /* HAVE_MBRTOWC */
}


/* Decode a byte string from the locale encoding.

 Use the strict error handler if 'surrogateescape' is zero. Use the
 surrogateescape error handler if 'surrogateescape' is non-zero: undecodable
 bytes are decoded as characters in range U+DC80..U+DCFF. If a byte sequence
 can be decoded as a surrogate character, escape the bytes using the
 surrogateescape error handler instead of decoding them.

 On success, return 0 and write the newly allocated wide character string into
 *wstr (use PyMem_RawFree() to free the memory). If wlen is not NULL, write
 the number of wide characters excluding the null character into *wlen.

 On memory allocation failure, return -1.

 On decoding error, return -2. If wlen is not NULL, write the start of
 invalid byte sequence in the input string into *wlen. If reason is not NULL,
 write the decoding error message into *reason.

 Return -3 if the error handler 'errors' is not supported.

 Use the Py_EncodeLocaleEx() function to encode the character string back to
 a byte string. */
int
_Py_DecodeLocaleEx(const char* arg, wchar_t **wstr, size_t *wlen,
 const char **reason,
 int current_locale, _Py_error_handler errors)
{
 if (current_locale) {
#ifdef _Py_FORCE_UTF8_LOCALE
 return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
 errors);
#else
 return decode_current_locale(arg, wstr, wlen, reason, errors);
#endif
 }

#ifdef _Py_FORCE_UTF8_FS_ENCODING
 return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
 errors);
#else
 int use_utf8 = (Py_UTF8Mode == 1);
#ifdef MS_WINDOWS
 use_utf8 |= !Py_LegacyWindowsFSEncodingFlag;
#endif
 if (use_utf8) {
 return _Py_DecodeUTF8Ex(arg, strlen(arg), wstr, wlen, reason,
 errors);
 }

#ifdef USE_FORCE_ASCII
 if (force_ascii == -1) {
 force_ascii = check_force_ascii();
 }

 if (force_ascii) {
 /* force ASCII encoding to workaround mbstowcs() issue */
 return decode_ascii(arg, wstr, wlen, reason, errors);
 }
#endif

 return decode_current_locale(arg, wstr, wlen, reason, errors);
#endif /* !_Py_FORCE_UTF8_FS_ENCODING */
}


/* Decode a byte string from the locale encoding with the
 surrogateescape error handler: undecodable bytes are decoded as characters
 in range U+DC80..U+DCFF. If a byte sequence can be decoded as a surrogate
 character, escape the bytes using the surrogateescape error handler instead
 of decoding them.

 Return a pointer to a newly allocated wide character string, use
 PyMem_RawFree() to free the memory. If size is not NULL, write the number of
 wide characters excluding the null character into *size

 Return NULL on decoding error or memory allocation error. If *size* is not
 NULL, *size is set to (size_t)-1 on memory error or set to (size_t)-2 on
 decoding error.

 Decoding errors should never happen, unless there is a bug in the C
 library.

 Use the Py_EncodeLocale() function to encode the character string back to a
 byte string. */
wchar_t*
Py_DecodeLocale(const char* arg, size_t *wlen)
{
 wchar_t *wstr;
 int res = _Py_DecodeLocaleEx(arg, &wstr, wlen,
 NULL, 0,
 _Py_ERROR_SURROGATEESCAPE);
 if (res != 0) {
 assert(res != -3);
 if (wlen != NULL) {
 *wlen = (size_t)res;
 }
 return NULL;
 }
 return wstr;
}


static int
encode_current_locale(const wchar_t *text, char **str,
 size_t *error_pos, const char **reason,
 int raw_malloc, _Py_error_handler errors)
{
 const size_t len = wcslen(text);
 char *result = NULL, *bytes = NULL;
 size_t i, size, converted;
 wchar_t c, buf[2];

 int surrogateescape;
 if (get_surrogateescape(errors, &surrogateescape) < 0) {
 return -3;
 }

 /* The function works in two steps:
 1. compute the length of the output buffer in bytes (size)
 2. outputs the bytes */
 size = 0;
 buf[1] = 0;
 while (1) {
 for (i=0; i < len; i++) {
 c = text[i];
 if (c >= 0xdc80 && c <= 0xdcff) {
 if (!surrogateescape) {
 goto encode_error;
 }
 /* UTF-8b surrogate */
 if (bytes != NULL) {
 *bytes++ = c - 0xdc00;
 size--;
 }
 else {
 size++;
 }
 continue;
 }
 else {
 buf[0] = c;
 if (bytes != NULL) {
 converted = wcstombs(bytes, buf, size);
 }
 else {
 converted = wcstombs(NULL, buf, 0);
 }
 if (converted == DECODE_ERROR) {
 goto encode_error;
 }
 if (bytes != NULL) {
 bytes += converted;
 size -= converted;
 }
 else {
 size += converted;
 }
 }
 }
 if (result != NULL) {
 *bytes = '0円';
 break;
 }

 size += 1; /* nul byte at the end */
 if (raw_malloc) {
 result = PyMem_RawMalloc(size);
 }
 else {
 result = PyMem_Malloc(size);
 }
 if (result == NULL) {
 return -1;
 }
 bytes = result;
 }
 *str = result;
 return 0;

encode_error:
 if (raw_malloc) {
 PyMem_RawFree(result);
 }
 else {
 PyMem_Free(result);
 }
 if (error_pos != NULL) {
 *error_pos = i;
 }
 if (reason) {
 *reason = "encoding error";
 }
 return -2;
}


/* Encode a string to the locale encoding.

 Parameters:

 * raw_malloc: if non-zero, allocate memory using PyMem_RawMalloc() instead
 of PyMem_Malloc().
 * current_locale: if non-zero, use the current LC_CTYPE, otherwise use
 Python filesystem encoding.
 * errors: error handler like "strict" or "surrogateescape".

 Return value:

 0: success, *str is set to a newly allocated decoded string.
 -1: memory allocation failure
 -2: encoding error, set *error_pos and *reason (if set).
 -3: the error handler 'errors' is not supported.
 */
static int
encode_locale_ex(const wchar_t *text, char **str, size_t *error_pos,
 const char **reason,
 int raw_malloc, int current_locale, _Py_error_handler errors)
{
 if (current_locale) {
#ifdef _Py_FORCE_UTF8_LOCALE
 return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
 raw_malloc, errors);
#else
 return encode_current_locale(text, str, error_pos, reason,
 raw_malloc, errors);
#endif
 }

#ifdef _Py_FORCE_UTF8_FS_ENCODING
 return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
 raw_malloc, errors);
#else
 int use_utf8 = (Py_UTF8Mode == 1);
#ifdef MS_WINDOWS
 use_utf8 |= !Py_LegacyWindowsFSEncodingFlag;
#endif
 if (use_utf8) {
 return _Py_EncodeUTF8Ex(text, str, error_pos, reason,
 raw_malloc, errors);
 }

#ifdef USE_FORCE_ASCII
 if (force_ascii == -1) {
 force_ascii = check_force_ascii();
 }

 if (force_ascii) {
 return encode_ascii(text, str, error_pos, reason,
 raw_malloc, errors);
 }
#endif

 return encode_current_locale(text, str, error_pos, reason,
 raw_malloc, errors);
#endif /* _Py_FORCE_UTF8_FS_ENCODING */
}

static char*
encode_locale(const wchar_t *text, size_t *error_pos,
 int raw_malloc, int current_locale)
{
 char *str;
 int res = encode_locale_ex(text, &str, error_pos, NULL,
 raw_malloc, current_locale,
 _Py_ERROR_SURROGATEESCAPE);
 if (res != -2 && error_pos) {
 *error_pos = (size_t)-1;
 }
 if (res != 0) {
 return NULL;
 }
 return str;
}

/* Encode a wide character string to the locale encoding with the
 surrogateescape error handler: surrogate characters in the range
 U+DC80..U+DCFF are converted to bytes 0x80..0xFF.

 Return a pointer to a newly allocated byte string, use PyMem_Free() to free
 the memory. Return NULL on encoding or memory allocation error.

 If error_pos is not NULL, *error_pos is set to (size_t)-1 on success, or set
 to the index of the invalid character on encoding error.

 Use the Py_DecodeLocale() function to decode the bytes string back to a wide
 character string. */
char*
Py_EncodeLocale(const wchar_t *text, size_t *error_pos)
{
 return encode_locale(text, error_pos, 0, 0);
}


/* Similar to Py_EncodeLocale(), but result must be freed by PyMem_RawFree()
 instead of PyMem_Free(). */
char*
_Py_EncodeLocaleRaw(const wchar_t *text, size_t *error_pos)
{
 return encode_locale(text, error_pos, 1, 0);
}


int
_Py_EncodeLocaleEx(const wchar_t *text, char **str,
 size_t *error_pos, const char **reason,
 int current_locale, _Py_error_handler errors)
{
 return encode_locale_ex(text, str, error_pos, reason, 1,
 current_locale, errors);
}


#ifdef MS_WINDOWS
static __int64 secs_between_epochs = 11644473600; /* Seconds between 1.1.1601 and 1.1.1970 */

static void
FILE_TIME_to_time_t_nsec(FILETIME *in_ptr, time_t *time_out, int* nsec_out)
{
 /* XXX endianness. Shouldn't matter, as all Windows implementations are little-endian */
 /* Cannot simply cast and dereference in_ptr,
 since it might not be aligned properly */
 __int64 in;
 memcpy(&in, in_ptr, sizeof(in));
 *nsec_out = (int)(in % 10000000) * 100; /* FILETIME is in units of 100 nsec. */
 *time_out = Py_SAFE_DOWNCAST((in / 10000000) - secs_between_epochs, __int64, time_t);
}

void
_Py_time_t_to_FILE_TIME(time_t time_in, int nsec_in, FILETIME *out_ptr)
{
 /* XXX endianness */
 __int64 out;
 out = time_in + secs_between_epochs;
 out = out * 10000000 + nsec_in / 100;
 memcpy(out_ptr, &out, sizeof(out));
}

/* Below, we *know* that ugo+r is 0444 */
#if _S_IREAD != 0400
#error Unsupported C library
#endif
static int
attributes_to_mode(DWORD attr)
{
 int m = 0;
 if (attr & FILE_ATTRIBUTE_DIRECTORY)
 m |= _S_IFDIR | 0111; /* IFEXEC for user,group,other */
 else
 m |= _S_IFREG;
 if (attr & FILE_ATTRIBUTE_READONLY)
 m |= 0444;
 else
 m |= 0666;
 return m;
}

void
_Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *info, ULONG reparse_tag,
 struct _Py_stat_struct *result)
{
 memset(result, 0, sizeof(*result));
 result->st_mode = attributes_to_mode(info->dwFileAttributes);
 result->st_size = (((__int64)info->nFileSizeHigh)<<32) + info->nFileSizeLow;
 result->st_dev = info->dwVolumeSerialNumber;
 result->st_rdev = result->st_dev;
 FILE_TIME_to_time_t_nsec(&info->ftCreationTime, &result->st_ctime, &result->st_ctime_nsec);
 FILE_TIME_to_time_t_nsec(&info->ftLastWriteTime, &result->st_mtime, &result->st_mtime_nsec);
 FILE_TIME_to_time_t_nsec(&info->ftLastAccessTime, &result->st_atime, &result->st_atime_nsec);
 result->st_nlink = info->nNumberOfLinks;
 result->st_ino = (((uint64_t)info->nFileIndexHigh) << 32) + info->nFileIndexLow;
 /* bpo-37834: Only actual symlinks set the S_IFLNK flag. But lstat() will
 open other name surrogate reparse points without traversing them. To
 detect/handle these, check st_file_attributes and st_reparse_tag. */
 result->st_reparse_tag = reparse_tag;
 if (info->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT &&
 reparse_tag == IO_REPARSE_TAG_SYMLINK) {
 /* first clear the S_IFMT bits */
 result->st_mode ^= (result->st_mode & S_IFMT);
 /* now set the bits that make this a symlink */
 result->st_mode |= S_IFLNK;
 }
 result->st_file_attributes = info->dwFileAttributes;
}
#endif

/* Return information about a file.

 On POSIX, use fstat().

 On Windows, use GetFileType() and GetFileInformationByHandle() which support
 files larger than 2 GiB. fstat() may fail with EOVERFLOW on files larger
 than 2 GiB because the file size type is a signed 32-bit integer: see issue
 #23152.

 On Windows, set the last Windows error and return nonzero on error. On
 POSIX, set errno and return nonzero on error. Fill status and return 0 on
 success. */
int
_Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
{
#ifdef MS_WINDOWS
 BY_HANDLE_FILE_INFORMATION info;
 HANDLE h;
 int type;

 _Py_BEGIN_SUPPRESS_IPH
 h = (HANDLE)_get_osfhandle(fd);
 _Py_END_SUPPRESS_IPH

 if (h == INVALID_HANDLE_VALUE) {
 /* errno is already set by _get_osfhandle, but we also set
 the Win32 error for callers who expect that */
 SetLastError(ERROR_INVALID_HANDLE);
 return -1;
 }
 memset(status, 0, sizeof(*status));

 type = GetFileType(h);
 if (type == FILE_TYPE_UNKNOWN) {
 DWORD error = GetLastError();
 if (error != 0) {
 errno = winerror_to_errno(error);
 return -1;
 }
 /* else: valid but unknown file */
 }

 if (type != FILE_TYPE_DISK) {
 if (type == FILE_TYPE_CHAR)
 status->st_mode = _S_IFCHR;
 else if (type == FILE_TYPE_PIPE)
 status->st_mode = _S_IFIFO;
 return 0;
 }

 if (!GetFileInformationByHandle(h, &info)) {
 /* The Win32 error is already set, but we also set errno for
 callers who expect it */
 errno = winerror_to_errno(GetLastError());
 return -1;
 }

 _Py_attribute_data_to_stat(&info, 0, status);
 /* specific to fstat() */
 status->st_ino = (((uint64_t)info.nFileIndexHigh) << 32) + info.nFileIndexLow;
 return 0;
#else
 return fstat(fd, status);
#endif
}

/* Return information about a file.

 On POSIX, use fstat().

 On Windows, use GetFileType() and GetFileInformationByHandle() which support
 files larger than 2 GiB. fstat() may fail with EOVERFLOW on files larger
 than 2 GiB because the file size type is a signed 32-bit integer: see issue
 #23152.

 Raise an exception and return -1 on error. On Windows, set the last Windows
 error on error. On POSIX, set errno on error. Fill status and return 0 on
 success.

 Release the GIL to call GetFileType() and GetFileInformationByHandle(), or
 to call fstat(). The caller must hold the GIL. */
int
_Py_fstat(int fd, struct _Py_stat_struct *status)
{
 int res;

 assert(PyGILState_Check());

 Py_BEGIN_ALLOW_THREADS
 res = _Py_fstat_noraise(fd, status);
 Py_END_ALLOW_THREADS

 if (res != 0) {
#ifdef MS_WINDOWS
 PyErr_SetFromWindowsErr(0);
#else
 PyErr_SetFromErrno(PyExc_OSError);
#endif
 return -1;
 }
 return 0;
}

/* Call _wstat() on Windows, or encode the path to the filesystem encoding and
 call stat() otherwise. Only fill st_mode attribute on Windows.

 Return 0 on success, -1 on _wstat() / stat() error, -2 if an exception was
 raised. */

int
_Py_stat(PyObject *path, struct stat *statbuf)
{
#ifdef MS_WINDOWS
 int err;
 struct _stat wstatbuf;
 const wchar_t *wpath;

 wpath = _PyUnicode_AsUnicode(path);
 if (wpath == NULL)
 return -2;

 err = _wstat(wpath, &wstatbuf);
 if (!err)
 statbuf->st_mode = wstatbuf.st_mode;
 return err;
#else
 int ret;
 PyObject *bytes;
 char *cpath;

 bytes = PyUnicode_EncodeFSDefault(path);
 if (bytes == NULL)
 return -2;

 /* check for embedded null bytes */
 if (PyBytes_AsStringAndSize(bytes, &cpath, NULL) == -1) {
 Py_DECREF(bytes);
 return -2;
 }

 ret = stat(cpath, statbuf);
 Py_DECREF(bytes);
 return ret;
#endif
}


/* This function MUST be kept async-signal-safe on POSIX when raise=0. */
static int
get_inheritable(int fd, int raise)
{
#ifdef MS_WINDOWS
 HANDLE handle;
 DWORD flags;

 _Py_BEGIN_SUPPRESS_IPH
 handle = (HANDLE)_get_osfhandle(fd);
 _Py_END_SUPPRESS_IPH
 if (handle == INVALID_HANDLE_VALUE) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 if (!GetHandleInformation(handle, &flags)) {
 if (raise)
 PyErr_SetFromWindowsErr(0);
 return -1;
 }

 return (flags & HANDLE_FLAG_INHERIT);
#else
 int flags;

 flags = fcntl(fd, F_GETFD, 0);
 if (flags == -1) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }
 return !(flags & FD_CLOEXEC);
#endif
}

/* Get the inheritable flag of the specified file descriptor.
 Return 1 if the file descriptor can be inherited, 0 if it cannot,
 raise an exception and return -1 on error. */
int
_Py_get_inheritable(int fd)
{
 return get_inheritable(fd, 1);
}


/* This function MUST be kept async-signal-safe on POSIX when raise=0. */
static int
set_inheritable(int fd, int inheritable, int raise, int *atomic_flag_works)
{
#ifdef MS_WINDOWS
 HANDLE handle;
 DWORD flags;
#else
#if defined(HAVE_SYS_IOCTL_H) && defined(FIOCLEX) && defined(FIONCLEX)
 static int ioctl_works = -1;
 int request;
 int err;
#endif
 int flags, new_flags;
 int res;
#endif

 /* atomic_flag_works can only be used to make the file descriptor
 non-inheritable */
 assert(!(atomic_flag_works != NULL && inheritable));

 if (atomic_flag_works != NULL && !inheritable) {
 if (*atomic_flag_works == -1) {
 int isInheritable = get_inheritable(fd, raise);
 if (isInheritable == -1)
 return -1;
 *atomic_flag_works = !isInheritable;
 }

 if (*atomic_flag_works)
 return 0;
 }

#ifdef MS_WINDOWS
 _Py_BEGIN_SUPPRESS_IPH
 handle = (HANDLE)_get_osfhandle(fd);
 _Py_END_SUPPRESS_IPH
 if (handle == INVALID_HANDLE_VALUE) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 if (inheritable)
 flags = HANDLE_FLAG_INHERIT;
 else
 flags = 0;

 /* This check can be removed once support for Windows 7 ends. */
#define CONSOLE_PSEUDOHANDLE(handle) (((ULONG_PTR)(handle) & 0x3) == 0x3 && \
 GetFileType(handle) == FILE_TYPE_CHAR)

 if (!CONSOLE_PSEUDOHANDLE(handle) &&
 !SetHandleInformation(handle, HANDLE_FLAG_INHERIT, flags)) {
 if (raise)
 PyErr_SetFromWindowsErr(0);
 return -1;
 }
#undef CONSOLE_PSEUDOHANDLE
 return 0;

#else

#if defined(HAVE_SYS_IOCTL_H) && defined(FIOCLEX) && defined(FIONCLEX)
 if (ioctl_works != 0 && raise != 0) {
 /* fast-path: ioctl() only requires one syscall */
 /* caveat: raise=0 is an indicator that we must be async-signal-safe
 * thus avoid using ioctl() so we skip the fast-path. */
 if (inheritable)
 request = FIONCLEX;
 else
 request = FIOCLEX;
 err = ioctl(fd, request, NULL);
 if (!err) {
 ioctl_works = 1;
 return 0;
 }

#ifdef __linux__
 if (errno == EBADF) {
 // On Linux, ioctl(FIOCLEX) will fail with EBADF for O_PATH file descriptors
 // Fall through to the fcntl() path
 }
 else
#endif
 if (errno != ENOTTY && errno != EACCES) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }
 else {
 /* Issue #22258: Here, ENOTTY means "Inappropriate ioctl for
 device". The ioctl is declared but not supported by the kernel.
 Remember that ioctl() doesn't work. It is the case on
 Illumos-based OS for example.

 Issue #27057: When SELinux policy disallows ioctl it will fail
 with EACCES. While FIOCLEX is safe operation it may be
 unavailable because ioctl was denied altogether.
 This can be the case on Android. */
 ioctl_works = 0;
 }
 /* fallback to fcntl() if ioctl() does not work */
 }
#endif

 /* slow-path: fcntl() requires two syscalls */
 flags = fcntl(fd, F_GETFD);
 if (flags < 0) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 if (inheritable) {
 new_flags = flags & ~FD_CLOEXEC;
 }
 else {
 new_flags = flags | FD_CLOEXEC;
 }

 if (new_flags == flags) {
 /* FD_CLOEXEC flag already set/cleared: nothing to do */
 return 0;
 }

 res = fcntl(fd, F_SETFD, new_flags);
 if (res < 0) {
 if (raise)
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }
 return 0;
#endif
}

/* Make the file descriptor non-inheritable.
 Return 0 on success, set errno and return -1 on error. */
static int
make_non_inheritable(int fd)
{
 return set_inheritable(fd, 0, 0, NULL);
}

/* Set the inheritable flag of the specified file descriptor.
 On success: return 0, on error: raise an exception and return -1.

 If atomic_flag_works is not NULL:

 * if *atomic_flag_works==-1, check if the inheritable is set on the file
 descriptor: if yes, set *atomic_flag_works to 1, otherwise set to 0 and
 set the inheritable flag
 * if *atomic_flag_works==1: do nothing
 * if *atomic_flag_works==0: set inheritable flag to False

 Set atomic_flag_works to NULL if no atomic flag was used to create the
 file descriptor.

 atomic_flag_works can only be used to make a file descriptor
 non-inheritable: atomic_flag_works must be NULL if inheritable=1. */
int
_Py_set_inheritable(int fd, int inheritable, int *atomic_flag_works)
{
 return set_inheritable(fd, inheritable, 1, atomic_flag_works);
}

/* Same as _Py_set_inheritable() but on error, set errno and
 don't raise an exception.
 This function is async-signal-safe. */
int
_Py_set_inheritable_async_safe(int fd, int inheritable, int *atomic_flag_works)
{
 return set_inheritable(fd, inheritable, 0, atomic_flag_works);
}

static int
_Py_open_impl(const char *pathname, int flags, int gil_held)
{
 int fd;
 int async_err = 0;
#ifndef MS_WINDOWS
 int *atomic_flag_works;
#endif

#ifdef MS_WINDOWS
 flags |= O_NOINHERIT;
#elif defined(O_CLOEXEC)
 atomic_flag_works = &_Py_open_cloexec_works;
 flags |= O_CLOEXEC;
#else
 atomic_flag_works = NULL;
#endif

 if (gil_held) {
 PyObject *pathname_obj = PyUnicode_DecodeFSDefault(pathname);
 if (pathname_obj == NULL) {
 return -1;
 }
 if (PySys_Audit("open", "OOi", pathname_obj, Py_None, flags) < 0) {
 Py_DECREF(pathname_obj);
 return -1;
 }

 do {
 Py_BEGIN_ALLOW_THREADS
 fd = open(pathname, flags);
 Py_END_ALLOW_THREADS
 } while (fd < 0
 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
 if (async_err) {
 Py_DECREF(pathname_obj);
 return -1;
 }
 if (fd < 0) {
 PyErr_SetFromErrnoWithFilenameObjects(PyExc_OSError, pathname_obj, NULL);
 Py_DECREF(pathname_obj);
 return -1;
 }
 Py_DECREF(pathname_obj);
 }
 else {
 fd = open(pathname, flags);
 if (fd < 0)
 return -1;
 }

#ifndef MS_WINDOWS
 if (set_inheritable(fd, 0, gil_held, atomic_flag_works) < 0) {
 close(fd);
 return -1;
 }
#endif

 return fd;
}

/* Open a file with the specified flags (wrapper to open() function).
 Return a file descriptor on success. Raise an exception and return -1 on
 error.

 The file descriptor is created non-inheritable.

 When interrupted by a signal (open() fails with EINTR), retry the syscall,
 except if the Python signal handler raises an exception.

 Release the GIL to call open(). The caller must hold the GIL. */
int
_Py_open(const char *pathname, int flags)
{
 /* _Py_open() must be called with the GIL held. */
 assert(PyGILState_Check());
 return _Py_open_impl(pathname, flags, 1);
}

/* Open a file with the specified flags (wrapper to open() function).
 Return a file descriptor on success. Set errno and return -1 on error.

 The file descriptor is created non-inheritable.

 If interrupted by a signal, fail with EINTR. */
int
_Py_open_noraise(const char *pathname, int flags)
{
 return _Py_open_impl(pathname, flags, 0);
}

/* Open a file. Use _wfopen() on Windows, encode the path to the locale
 encoding and use fopen() otherwise.

 The file descriptor is created non-inheritable.

 If interrupted by a signal, fail with EINTR. */
FILE *
_Py_wfopen(const wchar_t *path, const wchar_t *mode)
{
 FILE *f;
 if (PySys_Audit("open", "uui", path, mode, 0) < 0) {
 return NULL;
 }
#ifndef MS_WINDOWS
 char *cpath;
 char cmode[10];
 size_t r;
 r = wcstombs(cmode, mode, 10);
 if (r == DECODE_ERROR || r >= 10) {
 errno = EINVAL;
 return NULL;
 }
 cpath = _Py_EncodeLocaleRaw(path, NULL);
 if (cpath == NULL) {
 return NULL;
 }
 f = fopen(cpath, cmode);
 PyMem_RawFree(cpath);
#else
 f = _wfopen(path, mode);
#endif
 if (f == NULL)
 return NULL;
 if (make_non_inheritable(fileno(f)) < 0) {
 fclose(f);
 return NULL;
 }
 return f;
}

/* Wrapper to fopen().

 The file descriptor is created non-inheritable.

 If interrupted by a signal, fail with EINTR. */
FILE*
_Py_fopen(const char *pathname, const char *mode)
{
 PyObject *pathname_obj = PyUnicode_DecodeFSDefault(pathname);
 if (pathname_obj == NULL) {
 return NULL;
 }
 if (PySys_Audit("open", "Osi", pathname_obj, mode, 0) < 0) {
 Py_DECREF(pathname_obj);
 return NULL;
 }
 Py_DECREF(pathname_obj);

 FILE *f = fopen(pathname, mode);
 if (f == NULL)
 return NULL;
 if (make_non_inheritable(fileno(f)) < 0) {
 fclose(f);
 return NULL;
 }
 return f;
}

/* Open a file. Call _wfopen() on Windows, or encode the path to the filesystem
 encoding and call fopen() otherwise.

 Return the new file object on success. Raise an exception and return NULL
 on error.

 The file descriptor is created non-inheritable.

 When interrupted by a signal (open() fails with EINTR), retry the syscall,
 except if the Python signal handler raises an exception.

 Release the GIL to call _wfopen() or fopen(). The caller must hold
 the GIL. */
FILE*
_Py_fopen_obj(PyObject *path, const char *mode)
{
 FILE *f;
 int async_err = 0;
#ifdef MS_WINDOWS
 const wchar_t *wpath;
 wchar_t wmode[10];
 int usize;

 assert(PyGILState_Check());

 if (PySys_Audit("open", "Osi", path, mode, 0) < 0) {
 return NULL;
 }
 if (!PyUnicode_Check(path)) {
 PyErr_Format(PyExc_TypeError,
 "str file path expected under Windows, got %R",
 Py_TYPE(path));
 return NULL;
 }
 wpath = _PyUnicode_AsUnicode(path);
 if (wpath == NULL)
 return NULL;

 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1,
 wmode, Py_ARRAY_LENGTH(wmode));
 if (usize == 0) {
 PyErr_SetFromWindowsErr(0);
 return NULL;
 }

 do {
 Py_BEGIN_ALLOW_THREADS
 f = _wfopen(wpath, wmode);
 Py_END_ALLOW_THREADS
 } while (f == NULL
 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
#else
 PyObject *bytes;
 char *path_bytes;

 assert(PyGILState_Check());

 if (!PyUnicode_FSConverter(path, &bytes))
 return NULL;
 path_bytes = PyBytes_AS_STRING(bytes);

 if (PySys_Audit("open", "Osi", path, mode, 0) < 0) {
 Py_DECREF(bytes);
 return NULL;
 }

 do {
 Py_BEGIN_ALLOW_THREADS
 f = fopen(path_bytes, mode);
 Py_END_ALLOW_THREADS
 } while (f == NULL
 && errno == EINTR && !(async_err = PyErr_CheckSignals()));

 Py_DECREF(bytes);
#endif
 if (async_err)
 return NULL;

 if (f == NULL) {
 PyErr_SetFromErrnoWithFilenameObject(PyExc_OSError, path);
 return NULL;
 }

 if (set_inheritable(fileno(f), 0, 1, NULL) < 0) {
 fclose(f);
 return NULL;
 }
 return f;
}

/* Read count bytes from fd into buf.

 On success, return the number of read bytes, it can be lower than count.
 If the current file offset is at or past the end of file, no bytes are read,
 and read() returns zero.

 On error, raise an exception, set errno and return -1.

 When interrupted by a signal (read() fails with EINTR), retry the syscall.
 If the Python signal handler raises an exception, the function returns -1
 (the syscall is not retried).

 Release the GIL to call read(). The caller must hold the GIL. */
Py_ssize_t
_Py_read(int fd, void *buf, size_t count)
{
 Py_ssize_t n;
 int err;
 int async_err = 0;

 assert(PyGILState_Check());

 /* _Py_read() must not be called with an exception set, otherwise the
 * caller may think that read() was interrupted by a signal and the signal
 * handler raised an exception. */
 assert(!PyErr_Occurred());

 if (count > _PY_READ_MAX) {
 count = _PY_READ_MAX;
 }

 _Py_BEGIN_SUPPRESS_IPH
 do {
 Py_BEGIN_ALLOW_THREADS
 errno = 0;
#ifdef MS_WINDOWS
 n = read(fd, buf, (int)count);
#else
 n = read(fd, buf, count);
#endif
 /* save/restore errno because PyErr_CheckSignals()
 * and PyErr_SetFromErrno() can modify it */
 err = errno;
 Py_END_ALLOW_THREADS
 } while (n < 0 && err == EINTR &&
 !(async_err = PyErr_CheckSignals()));
 _Py_END_SUPPRESS_IPH

 if (async_err) {
 /* read() was interrupted by a signal (failed with EINTR)
 * and the Python signal handler raised an exception */
 errno = err;
 assert(errno == EINTR && PyErr_Occurred());
 return -1;
 }
 if (n < 0) {
 PyErr_SetFromErrno(PyExc_OSError);
 errno = err;
 return -1;
 }

 return n;
}

static Py_ssize_t
_Py_write_impl(int fd, const void *buf, size_t count, int gil_held)
{
 Py_ssize_t n;
 int err;
 int async_err = 0;

 _Py_BEGIN_SUPPRESS_IPH
#ifdef MS_WINDOWS
 if (count > 32767 && isatty(fd)) {
 /* Issue #11395: the Windows console returns an error (12: not
 enough space error) on writing into stdout if stdout mode is
 binary and the length is greater than 66,000 bytes (or less,
 depending on heap usage). */
 count = 32767;
 }
#endif
 if (count > _PY_WRITE_MAX) {
 count = _PY_WRITE_MAX;
 }

 if (gil_held) {
 do {
 Py_BEGIN_ALLOW_THREADS
 errno = 0;
#ifdef MS_WINDOWS
 n = write(fd, buf, (int)count);
#else
 n = write(fd, buf, count);
#endif
 /* save/restore errno because PyErr_CheckSignals()
 * and PyErr_SetFromErrno() can modify it */
 err = errno;
 Py_END_ALLOW_THREADS
 } while (n < 0 && err == EINTR &&
 !(async_err = PyErr_CheckSignals()));
 }
 else {
 do {
 errno = 0;
#ifdef MS_WINDOWS
 n = write(fd, buf, (int)count);
#else
 n = write(fd, buf, count);
#endif
 err = errno;
 } while (n < 0 && err == EINTR);
 }
 _Py_END_SUPPRESS_IPH

 if (async_err) {
 /* write() was interrupted by a signal (failed with EINTR)
 and the Python signal handler raised an exception (if gil_held is
 nonzero). */
 errno = err;
 assert(errno == EINTR && (!gil_held || PyErr_Occurred()));
 return -1;
 }
 if (n < 0) {
 if (gil_held)
 PyErr_SetFromErrno(PyExc_OSError);
 errno = err;
 return -1;
 }

 return n;
}

/* Write count bytes of buf into fd.

 On success, return the number of written bytes, it can be lower than count
 including 0. On error, raise an exception, set errno and return -1.

 When interrupted by a signal (write() fails with EINTR), retry the syscall.
 If the Python signal handler raises an exception, the function returns -1
 (the syscall is not retried).

 Release the GIL to call write(). The caller must hold the GIL. */
Py_ssize_t
_Py_write(int fd, const void *buf, size_t count)
{
 assert(PyGILState_Check());

 /* _Py_write() must not be called with an exception set, otherwise the
 * caller may think that write() was interrupted by a signal and the signal
 * handler raised an exception. */
 assert(!PyErr_Occurred());

 return _Py_write_impl(fd, buf, count, 1);
}

/* Write count bytes of buf into fd.
 *
 * On success, return the number of written bytes, it can be lower than count
 * including 0. On error, set errno and return -1.
 *
 * When interrupted by a signal (write() fails with EINTR), retry the syscall
 * without calling the Python signal handler. */
Py_ssize_t
_Py_write_noraise(int fd, const void *buf, size_t count)
{
 return _Py_write_impl(fd, buf, count, 0);
}

#ifdef HAVE_READLINK

/* Read value of symbolic link. Encode the path to the locale encoding, decode
 the result from the locale encoding.

 Return -1 on encoding error, on readlink() error, if the internal buffer is
 too short, on decoding error, or if 'buf' is too short. */
int
_Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t buflen)
{
 char *cpath;
 char cbuf[MAXPATHLEN];
 wchar_t *wbuf;
 int res;
 size_t r1;

 cpath = _Py_EncodeLocaleRaw(path, NULL);
 if (cpath == NULL) {
 errno = EINVAL;
 return -1;
 }
 res = (int)readlink(cpath, cbuf, Py_ARRAY_LENGTH(cbuf));
 PyMem_RawFree(cpath);
 if (res == -1)
 return -1;
 if (res == Py_ARRAY_LENGTH(cbuf)) {
 errno = EINVAL;
 return -1;
 }
 cbuf[res] = '0円'; /* buf will be null terminated */
 wbuf = Py_DecodeLocale(cbuf, &r1);
 if (wbuf == NULL) {
 errno = EINVAL;
 return -1;
 }
 /* wbuf must have space to store the trailing NUL character */
 if (buflen <= r1) {
 PyMem_RawFree(wbuf);
 errno = EINVAL;
 return -1;
 }
 wcsncpy(buf, wbuf, buflen);
 PyMem_RawFree(wbuf);
 return (int)r1;
}
#endif

#ifdef HAVE_REALPATH

/* Return the canonicalized absolute pathname. Encode path to the locale
 encoding, decode the result from the locale encoding.

 Return NULL on encoding error, realpath() error, decoding error
 or if 'resolved_path' is too short. */
wchar_t*
_Py_wrealpath(const wchar_t *path,
 wchar_t *resolved_path, size_t resolved_path_len)
{
 char *cpath;
 char cresolved_path[MAXPATHLEN];
 wchar_t *wresolved_path;
 char *res;
 size_t r;
 cpath = _Py_EncodeLocaleRaw(path, NULL);
 if (cpath == NULL) {
 errno = EINVAL;
 return NULL;
 }
 res = realpath(cpath, cresolved_path);
 PyMem_RawFree(cpath);
 if (res == NULL)
 return NULL;

 wresolved_path = Py_DecodeLocale(cresolved_path, &r);
 if (wresolved_path == NULL) {
 errno = EINVAL;
 return NULL;
 }
 /* wresolved_path must have space to store the trailing NUL character */
 if (resolved_path_len <= r) {
 PyMem_RawFree(wresolved_path);
 errno = EINVAL;
 return NULL;
 }
 wcsncpy(resolved_path, wresolved_path, resolved_path_len);
 PyMem_RawFree(wresolved_path);
 return resolved_path;
}
#endif

/* Get the current directory. buflen is the buffer size in wide characters
 including the null character. Decode the path from the locale encoding.

 Return NULL on getcwd() error, on decoding error, or if 'buf' is
 too short. */
wchar_t*
_Py_wgetcwd(wchar_t *buf, size_t buflen)
{
#ifdef MS_WINDOWS
 int ibuflen = (int)Py_MIN(buflen, INT_MAX);
 return _wgetcwd(buf, ibuflen);
#else
 char fname[MAXPATHLEN];
 wchar_t *wname;
 size_t len;

 if (getcwd(fname, Py_ARRAY_LENGTH(fname)) == NULL)
 return NULL;
 wname = Py_DecodeLocale(fname, &len);
 if (wname == NULL)
 return NULL;
 /* wname must have space to store the trailing NUL character */
 if (buflen <= len) {
 PyMem_RawFree(wname);
 return NULL;
 }
 wcsncpy(buf, wname, buflen);
 PyMem_RawFree(wname);
 return buf;
#endif
}

/* Duplicate a file descriptor. The new file descriptor is created as
 non-inheritable. Return a new file descriptor on success, raise an OSError
 exception and return -1 on error.

 The GIL is released to call dup(). The caller must hold the GIL. */
int
_Py_dup(int fd)
{
#ifdef MS_WINDOWS
 HANDLE handle;
#endif

 assert(PyGILState_Check());

#ifdef MS_WINDOWS
 _Py_BEGIN_SUPPRESS_IPH
 handle = (HANDLE)_get_osfhandle(fd);
 _Py_END_SUPPRESS_IPH
 if (handle == INVALID_HANDLE_VALUE) {
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 Py_BEGIN_ALLOW_THREADS
 _Py_BEGIN_SUPPRESS_IPH
 fd = dup(fd);
 _Py_END_SUPPRESS_IPH
 Py_END_ALLOW_THREADS
 if (fd < 0) {
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 if (_Py_set_inheritable(fd, 0, NULL) < 0) {
 _Py_BEGIN_SUPPRESS_IPH
 close(fd);
 _Py_END_SUPPRESS_IPH
 return -1;
 }
#elif defined(HAVE_FCNTL_H) && defined(F_DUPFD_CLOEXEC)
 Py_BEGIN_ALLOW_THREADS
 _Py_BEGIN_SUPPRESS_IPH
 fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
 _Py_END_SUPPRESS_IPH
 Py_END_ALLOW_THREADS
 if (fd < 0) {
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

#else
 Py_BEGIN_ALLOW_THREADS
 _Py_BEGIN_SUPPRESS_IPH
 fd = dup(fd);
 _Py_END_SUPPRESS_IPH
 Py_END_ALLOW_THREADS
 if (fd < 0) {
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 if (_Py_set_inheritable(fd, 0, NULL) < 0) {
 _Py_BEGIN_SUPPRESS_IPH
 close(fd);
 _Py_END_SUPPRESS_IPH
 return -1;
 }
#endif
 return fd;
}

#ifndef MS_WINDOWS
/* Get the blocking mode of the file descriptor.
 Return 0 if the O_NONBLOCK flag is set, 1 if the flag is cleared,
 raise an exception and return -1 on error. */
int
_Py_get_blocking(int fd)
{
 int flags;
 _Py_BEGIN_SUPPRESS_IPH
 flags = fcntl(fd, F_GETFL, 0);
 _Py_END_SUPPRESS_IPH
 if (flags < 0) {
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
 }

 return !(flags & O_NONBLOCK);
}

/* Set the blocking mode of the specified file descriptor.

 Set the O_NONBLOCK flag if blocking is False, clear the O_NONBLOCK flag
 otherwise.

 Return 0 on success, raise an exception and return -1 on error. */
int
_Py_set_blocking(int fd, int blocking)
{
#if defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO)
 int arg = !blocking;
 if (ioctl(fd, FIONBIO, &arg) < 0)
 goto error;
#else
 int flags, res;

 _Py_BEGIN_SUPPRESS_IPH
 flags = fcntl(fd, F_GETFL, 0);
 if (flags >= 0) {
 if (blocking)
 flags = flags & (~O_NONBLOCK);
 else
 flags = flags | O_NONBLOCK;

 res = fcntl(fd, F_SETFL, flags);
 } else {
 res = -1;
 }
 _Py_END_SUPPRESS_IPH

 if (res < 0)
 goto error;
#endif
 return 0;

error:
 PyErr_SetFromErrno(PyExc_OSError);
 return -1;
}
#endif


int
_Py_GetLocaleconvNumeric(struct lconv *lc,
 PyObject **decimal_point, PyObject **thousands_sep)
{
 assert(decimal_point != NULL);
 assert(thousands_sep != NULL);

#ifndef MS_WINDOWS
 int change_locale = 0;
 if ((strlen(lc->decimal_point) > 1 || ((unsigned char)lc->decimal_point[0]) > 127)) {
 change_locale = 1;
 }
 if ((strlen(lc->thousands_sep) > 1 || ((unsigned char)lc->thousands_sep[0]) > 127)) {
 change_locale = 1;
 }

 /* Keep a copy of the LC_CTYPE locale */
 char *oldloc = NULL, *loc = NULL;
 if (change_locale) {
 oldloc = setlocale(LC_CTYPE, NULL);
 if (!oldloc) {
 PyErr_SetString(PyExc_RuntimeWarning,
 "failed to get LC_CTYPE locale");
 return -1;
 }

 oldloc = _PyMem_Strdup(oldloc);
 if (!oldloc) {
 PyErr_NoMemory();
 return -1;
 }

 loc = setlocale(LC_NUMERIC, NULL);
 if (loc != NULL && strcmp(loc, oldloc) == 0) {
 loc = NULL;
 }

 if (loc != NULL) {
 /* Only set the locale temporarily the LC_CTYPE locale
 if LC_NUMERIC locale is different than LC_CTYPE locale and
 decimal_point and/or thousands_sep are non-ASCII or longer than
 1 byte */
 setlocale(LC_CTYPE, loc);
 }
 }

#define GET_LOCALE_STRING(ATTR) PyUnicode_DecodeLocale(lc->ATTR, NULL)
#else /* MS_WINDOWS */
/* Use _W_* fields of Windows strcut lconv */
#define GET_LOCALE_STRING(ATTR) PyUnicode_FromWideChar(lc->_W_ ## ATTR, -1)
#endif /* MS_WINDOWS */

 int res = -1;

 *decimal_point = GET_LOCALE_STRING(decimal_point);
 if (*decimal_point == NULL) {
 goto done;
 }

 *thousands_sep = GET_LOCALE_STRING(thousands_sep);
 if (*thousands_sep == NULL) {
 goto done;
 }

 res = 0;

done:
#ifndef MS_WINDOWS
 if (loc != NULL) {
 setlocale(LC_CTYPE, oldloc);
 }
 PyMem_Free(oldloc);
#endif
 return res;

#undef GET_LOCALE_STRING
}