DirectXShaderCompiler/lib/Support/Windows/TimeValue.inc

//===- Win32/TimeValue.cpp - Win32 TimeValue Implementation -----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 implementation of the TimeValue class.
//
//===----------------------------------------------------------------------===//

#include "WindowsSupport.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
#include <time.h>

using namespace llvm;
using namespace llvm::sys;

//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code.
//===----------------------------------------------------------------------===//

TimeValue TimeValue::now() {
  uint64_t ft;
  GetSystemTimeAsFileTime(reinterpret_cast<FILETIME *>(&ft));

  TimeValue t(0, 0);
  t.fromWin32Time(ft);
  return t;
}

std::string TimeValue::str() const {
  std::string S;
  struct tm *LT;
#ifdef __MINGW32__
  // Old versions of mingw don't have _localtime64_s. Remove this once we drop support
  // for them.
  time_t OurTime = time_t(this->toEpochTime());
  LT = ::localtime(&OurTime);
  assert(LT);
#else
  struct tm Storage;
  __time64_t OurTime = this->toEpochTime();
  int Error = ::_localtime64_s(&Storage, &OurTime);
  assert(!Error);
  (void)Error;
  LT = &Storage;
#endif

  char Buffer[sizeof("YYYY-MM-DD HH:MM:SS")];
  strftime(Buffer, sizeof(Buffer), "%Y-%m-%d %H:%M:%S", LT);
  raw_string_ostream OS(S);
  OS << format("%s.%.9u", static_cast<const char *>(Buffer),
               this->nanoseconds());
  OS.flush();
  return S;
}