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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmFileTime.h"
#include <ctime>
#include <string>
// Use a platform-specific API to get file times efficiently.
#if !defined(_WIN32) || defined(__CYGWIN__)
# include "cm_sys_stat.h"
#else
# include "cmsys/Encoding.hxx"
# include <windows.h>
#endif
bool cmFileTime::Load(std::string const& fileName)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
// POSIX version. Use the stat function.
struct stat fst;
if (::stat(fileName.c_str(), &fst) != 0) {
return false;
}
# if CMake_STAT_HAS_ST_MTIM
// Nanosecond resolution
this->NS = fst.st_mtim.tv_sec * NsPerS + fst.st_mtim.tv_nsec;
# elif CMake_STAT_HAS_ST_MTIMESPEC
// Nanosecond resolution
this->NS = fst.st_mtimespec.tv_sec * NsPerS + fst.st_mtimespec.tv_nsec;
# else
// Second resolution
this->NS = fst.st_mtime * NsPerS;
# endif
#else
// Windows version. Get the modification time from extended file attributes.
WIN32_FILE_ATTRIBUTE_DATA fdata;
if (!GetFileAttributesExW(cmsys::Encoding::ToWide(fileName).c_str(),
GetFileExInfoStandard, &fdata)) {
return false;
}
// Copy the file time to the output location.
this->NS = (static_cast<NSC>(fdata.ftLastWriteTime.dwHighDateTime) << 32) |
static_cast<NSC>(fdata.ftLastWriteTime.dwLowDateTime);
// The file time resolution is 100 ns.
this->NS *= 100;
#endif
return true;
}
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