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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158//// utime.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// The utime and futime families of functions, which set the modification time// for a file.//#include <corecrt_internal_lowio.h>#include <corecrt_internal_time.h>
// Sets the modification time for a file, where 'file_name' is the name of the// file. Returns zero on success; returns -1 and sets errno on failure.template <typename TimeType, typename Character, typename TimeBufferType>static int __cdecl common_utime( Character const* const file_name, TimeBufferType* const times ) throw(){ typedef __crt_time_traits<TimeType, Character> time_traits;
_VALIDATE_RETURN(file_name != nullptr, EINVAL, -1)
// Open the file, since the underlying system call needs a handle. Note // that the _utime definition says you must have write permission for the // file to change its time, so we open the file for write only. Also, we // must force it to open in binary mode so that we don't remove ^Z's from // binary files. int fh; if (time_traits::tsopen_s(&fh, file_name, _O_RDWR | _O_BINARY, _SH_DENYNO, 0) != 0) return -1;
int const result = time_traits::futime(fh, times);
errno_t stored_errno = 0; if (result == -1) stored_errno = errno;
_close(fh);
if (result == -1) errno = stored_errno;
return result;}
extern "C" int __cdecl _utime32(char const* const file_name, __utimbuf32* const times){ return common_utime<__time32_t>(file_name, times);}
extern "C" int __cdecl _wutime32(wchar_t const* const file_name, __utimbuf32* const times){ return common_utime<__time32_t>(file_name, times);}
extern "C" int __cdecl _utime64(char const* const file_name, __utimbuf64* const times){ return common_utime<__time64_t>(file_name, times);}
extern "C" int __cdecl _wutime64(wchar_t const* const file_name, __utimbuf64* const times){ return common_utime<__time64_t>(file_name, times);}
// Sets the modification time for an open file, where the 'fh' is the lowio file// handle of the open file. Returns zero on success; returns -1 and sets errno// on failure.template <typename TimeType, typename TimeBufferType>static int __cdecl common_futime(int const fh, TimeBufferType* times) throw(){ typedef __crt_time_time_t_traits<TimeType> time_traits;
_CHECK_FH_RETURN(fh, EBADF, -1);
_VALIDATE_RETURN(fh >= 0 && static_cast<unsigned>(fh) < static_cast<unsigned>(_nhandle), EBADF, -1); _VALIDATE_RETURN(_osfile(fh) & FOPEN, EBADF, -1);
TimeBufferType default_times;
if (times == nullptr) { time_traits::time(&default_times.modtime); default_times.actime = default_times.modtime; times = &default_times; }
tm tm_value; if (time_traits::localtime_s(&tm_value, ×->modtime) != 0) { errno = EINVAL; return -1; }
SYSTEMTIME local_time; local_time.wYear = static_cast<WORD>(tm_value.tm_year + 1900); local_time.wMonth = static_cast<WORD>(tm_value.tm_mon + 1); local_time.wDay = static_cast<WORD>(tm_value.tm_mday); local_time.wHour = static_cast<WORD>(tm_value.tm_hour); local_time.wMinute = static_cast<WORD>(tm_value.tm_min); local_time.wSecond = static_cast<WORD>(tm_value.tm_sec); local_time.wMilliseconds = 0;
SYSTEMTIME system_time; FILETIME last_write_time; if (!TzSpecificLocalTimeToSystemTime(nullptr, &local_time, &system_time) || !SystemTimeToFileTime(&system_time, &last_write_time)) { errno = EINVAL; return -1; }
if (time_traits::localtime_s(&tm_value, ×->actime) != 0) { errno = EINVAL; return -1; }
local_time.wYear = static_cast<WORD>(tm_value.tm_year + 1900); local_time.wMonth = static_cast<WORD>(tm_value.tm_mon + 1); local_time.wDay = static_cast<WORD>(tm_value.tm_mday); local_time.wHour = static_cast<WORD>(tm_value.tm_hour); local_time.wMinute = static_cast<WORD>(tm_value.tm_min); local_time.wSecond = static_cast<WORD>(tm_value.tm_sec); local_time.wMilliseconds = 0;
FILETIME last_access_time; if (!TzSpecificLocalTimeToSystemTime(nullptr, &local_time, &system_time) || !SystemTimeToFileTime(&system_time, &last_access_time)) { errno = EINVAL; return -1; }
if (!SetFileTime(reinterpret_cast<HANDLE>(_get_osfhandle(fh)), nullptr, &last_access_time, &last_write_time)) { errno = EINVAL; return -1; }
return 0;}
extern "C" int __cdecl _futime32(int const fh, __utimbuf32* const times){ return common_futime<__time32_t>(fh, times);}
extern "C" int __cdecl _futime64(int const fh, __utimbuf64* const times){ return common_futime<__time64_t>(fh, times);}