Add disk_space() to llvm::fs

Summary: Adapted from Boost::filesystem.
(This is a reapply by reverting commit r265080 and fixing the WinAPI part)

Differential Revision: http://reviews.llvm.org/D18467

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 265082

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index 98fd7b0034a..068ed357819 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -151,6 +151,19 @@ UniqueID file_status::getUniqueID() const {
   return UniqueID(VolumeSerialNumber, FileID);
 }
 
+ErrorOr<space_info> disk_space(const Twine &Path) {
+  ULARGE_INTEGER Avail, Total, Free;
+  if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free))
+    return mapWindowsError(::GetLastError());
+  space_info SpaceInfo;
+  SpaceInfo.capacity =
+      (static_cast<uint64_t>(Total.HighPart) << 32) + Total.LowPart;
+  SpaceInfo.Free = (static_cast<uint64_t>(Free.HighPart) << 32) + Free.LowPart;
+  SpaceInfo.available =
+      (static_cast<uint64_t>(Avail.HighPart) << 32) + Avail.LowPart;
+  return SpaceInfo;
+}
+
 TimeValue file_status::getLastAccessedTime() const {
   ULARGE_INTEGER UI;
   UI.LowPart = LastAccessedTimeLow;