From a0a7c1f552ab023bef738529c4d7ce2fc4e7a338 Mon Sep 17 00:00:00 2001
From: Eric Fiselier <eric@efcs.ca>
Date: Thu, 26 Jul 2018 03:57:26 +0000
Subject: [PATCH] Cleanup the last_write_time internals

llvm-svn: 338001
---
 .../experimental/filesystem/filesystem_common.h    | 40 +++++++++++++---------
 libcxx/src/experimental/filesystem/operations.cpp  |  3 +-
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/libcxx/src/experimental/filesystem/filesystem_common.h b/libcxx/src/experimental/filesystem/filesystem_common.h
index 5d2a5ed..94f4d41 100644
--- a/libcxx/src/experimental/filesystem/filesystem_common.h
+++ b/libcxx/src/experimental/filesystem/filesystem_common.h
@@ -19,6 +19,7 @@
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <sys/time.h> // for ::utimes as used in __last_write_time
 #include <fcntl.h> /* values for fchmodat */
 
 #include <experimental/filesystem>
@@ -33,14 +34,6 @@
 #endif
 #endif
 
-#if !defined(_LIBCPP_USE_UTIMENSAT)
-#include <sys/time.h> // for ::utimes as used in __last_write_time
-#endif
-
-#if !defined(UTIME_OMIT)
-#include <sys/time.h> // for ::utimes as used in __last_write_time
-#endif
-
 #if defined(__GNUC__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-function"
@@ -389,9 +382,11 @@ TimeSpec extract_mtime(StatT const& st) { return st.st_mtim; }
 TimeSpec extract_atime(StatT const& st) { return st.st_atim; }
 #endif
 
-bool set_file_times(const path& p, std::array<TimeSpec, 2> const& TS,
+// allow the utimes implementation to compile even it we're not going
+// to use it.
+
+bool posix_utimes(const path& p, std::array<TimeSpec, 2> const& TS,
                     error_code& ec) {
-#if !defined(_LIBCPP_USE_UTIMENSAT)
   using namespace chrono;
   auto Convert = [](long nsec) {
     using int_type = decltype(std::declval<::timeval>().tv_usec);
@@ -400,22 +395,35 @@ bool set_file_times(const path& p, std::array<TimeSpec, 2> const& TS,
   };
   struct ::timeval ConvertedTS[2] = {{TS[0].tv_sec, Convert(TS[0].tv_nsec)},
                                      {TS[1].tv_sec, Convert(TS[1].tv_nsec)}};
-  if (::utimes(p.c_str(), ConvertedTS) == -1)
-#else
+  if (::utimes(p.c_str(), ConvertedTS) == -1) {
+    ec = capture_errno();
+    return true;
+  }
+  return false;
+}
+
+#if defined(_LIBCPP_USE_UTIMENSAT)
+bool posix_utimensat(const path& p, std::array<TimeSpec, 2> const& TS,
+                    error_code& ec) {
   if (::utimensat(AT_FDCWD, p.c_str(), TS.data(), 0) == -1)
-#endif
   {
     ec = capture_errno();
     return true;
   }
   return false;
 }
+#endif
 
-bool set_time_spec_to(TimeSpec& TS, file_time_type NewTime) {
-  return !fs_time::set_times_checked(
-      &TS.tv_sec, &TS.tv_nsec, NewTime);
+bool set_file_times(const path& p, std::array<TimeSpec, 2> const& TS,
+                    error_code& ec) {
+#if !defined(_LIBCPP_USE_UTIMENSAT)
+  return posix_utimes(p, TS, ec);
+#else
+  return posix_utimensat(p, TS, ec);
+#endif
 }
 
+
 } // namespace
 } // end namespace detail
 
diff --git a/libcxx/src/experimental/filesystem/operations.cpp b/libcxx/src/experimental/filesystem/operations.cpp
index d570668..028d5bf 100644
--- a/libcxx/src/experimental/filesystem/operations.cpp
+++ b/libcxx/src/experimental/filesystem/operations.cpp
@@ -1017,6 +1017,7 @@ file_time_type __last_write_time(const path& p, error_code *ec)
 void __last_write_time(const path& p, file_time_type new_time,
                        error_code *ec)
 {
+    using detail::fs_time;
     ErrorHandler<void> err("last_write_time", ec, &p);
 
     error_code m_ec;
@@ -1034,7 +1035,7 @@ void __last_write_time(const path& p, file_time_type new_time,
     tbuf[0].tv_sec = 0;
     tbuf[0].tv_nsec = UTIME_OMIT;
 #endif
-    if (detail::set_time_spec_to(tbuf[1], new_time))
+    if (!fs_time::convert_to_timespec(tbuf[1], new_time))
       return err.report(errc::value_too_large);
 
     detail::set_file_times(p, tbuf, m_ec);
-- 
2.7.4