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Find stat nanoseconds using SFINAE.

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GitOrigin-RevId: 90b0f42ca6349e2cf4236caf6f81742384649072
This commit is contained in:
levlam 2018-03-10 22:19:58 +03:00
parent 3823aa73e8
commit ca0b876c62
1 changed files with 45 additions and 15 deletions
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60
tdutils/td/utils/port/Stat.cpp
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@ -16,6 +16,8 @@
#include "td/utils/port/Clocks.h"
#include "td/utils/ScopeGuard.h"
#include <utility>
#if TD_DARWIN
#include <mach/mach.h>
#include <sys/time.h>
@ -36,27 +38,55 @@
#endif
namespace td {
namespace detail {
template <class...>
struct voider {
using type = void;
};
template <class... T>
using void_t = typename voider<T...>::type;
template <class T, class = void>
struct TimeNsec {
static std::pair<int, int> get(const T &) {
T().warning("Platform lacks support of precise access/modification file times, comment this line to continue");
return {0, 0};
}
};
template <class T>
struct TimeNsec<T, void_t<char, decltype(T::st_atimespec), decltype(T::st_mtimespec)>> {
static std::pair<decltype(decltype(T::st_atimespec)::tv_nsec), decltype(decltype(T::st_mtimespec)::tv_nsec)> get(
const T &s) {
return {s.st_atimespec.tv_nsec, s.st_mtimespec.tv_nsec};
}
};
template <class T>
struct TimeNsec<T, void_t<short, decltype(T::st_atimensec), decltype(T::st_mtimensec)>> {
static std::pair<decltype(T::st_atimensec), decltype(T::st_mtimensec)> get(const T &s) {
return {s.st_atimensec, s.st_mtimensec};
}
};
template <class T>
struct TimeNsec<T, void_t<int, decltype(T::st_atim), decltype(T::st_mtim)>> {
static std::pair<decltype(decltype(T::st_atim)::tv_nsec), decltype(decltype(T::st_mtim)::tv_nsec)> get(const T &s) {
return {s.st_atim.tv_nsec, s.st_mtim.tv_nsec};
}
};
Stat from_native_stat(const struct ::stat &buf) {
auto time_nsec = TimeNsec<struct ::stat>::get(buf);
Stat res;
#if TD_DARWIN
res.mtime_nsec_ = buf.st_mtimespec.tv_sec * 1000000000ll + buf.st_mtimespec.tv_nsec; // khm
res.atime_nsec_ = buf.st_atimespec.tv_sec * 1000000000ll + buf.st_atimespec.tv_nsec;
#else
#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700 || TD_EMSCRIPTEN
res.mtime_nsec_ = buf.st_mtime * 1000000000ll + buf.st_mtim.tv_nsec;
res.atime_nsec_ = buf.st_atime * 1000000000ll + buf.st_atim.tv_nsec;
#else
res.mtime_nsec_ = buf.st_mtime * 1000000000ll + buf.st_mtimensec;
res.atime_nsec_ = buf.st_atime * 1000000000ll + buf.st_atimensec;
#endif
#endif
res.atime_nsec_ = static_cast<uint64>(buf.st_atime) * 1000000000 + time_nsec.first;
res.mtime_nsec_ = static_cast<uint64>(buf.st_mtime) * 1000000000 + time_nsec.second / 1000 * 1000;
res.size_ = buf.st_size;
res.is_dir_ = (buf.st_mode & S_IFMT) == S_IFDIR;
res.is_reg_ = (buf.st_mode & S_IFMT) == S_IFREG;
res.mtime_nsec_ /= 1000;
res.mtime_nsec_ *= 1000;
return res;
}