From 703b8c822592d51d449930e1280c2a3dc92698e9 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 14 Apr 2008 11:43:45 -0400
Subject: ENH: Added methods to cmSystemTools to save and restore file
 modification times.

---
 Source/cmSystemTools.cxx | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 Source/cmSystemTools.h   |  8 +++++-
 2 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 6091ab5..68ebb4f 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -56,6 +56,18 @@
 # include "cmELF.h"
 #endif
 
+class cmSystemToolsFileTime
+{
+public:
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  FILETIME timeCreation;
+  FILETIME timeLastAccess;
+  FILETIME timeLastWrite;
+#else
+  struct utimbuf timeBuf;
+#endif
+};
+
 #if defined(__sgi) && !defined(__GNUC__)
 # pragma set woff 1375 /* base class destructor not virtual */
 #endif
@@ -2111,6 +2123,67 @@ bool cmSystemTools::CopyFileTime(const char* fromFile, const char* toFile)
 }
 
 //----------------------------------------------------------------------------
+cmSystemToolsFileTime* cmSystemTools::FileTimeNew()
+{
+  return new cmSystemToolsFileTime;
+}
+
+//----------------------------------------------------------------------------
+void cmSystemTools::FileTimeDelete(cmSystemToolsFileTime* t)
+{
+  delete t;
+}
+
+//----------------------------------------------------------------------------
+bool cmSystemTools::FileTimeGet(const char* fname, cmSystemToolsFileTime* t)
+{
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  cmSystemToolsWindowsHandle h =
+    CreateFile(fname, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
+  if(!h)
+    {
+    return false;
+    }
+  if(!GetFileTime(h, &t->timeCreation, &t->timeLastAccess, &t->timeLastWrite))
+    {
+    return false;
+    }
+#else
+  struct stat st;
+  if(stat(fname, &st) < 0)
+    {
+    return false;
+    }
+  t->timeBuf.actime = st.st_atime;
+  t->timeBuf.modtime = st.st_mtime;
+#endif
+  return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmSystemTools::FileTimeSet(const char* fname, cmSystemToolsFileTime* t)
+{
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  cmSystemToolsWindowsHandle h =
+    CreateFile(toFile, GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
+  if(!h)
+    {
+    return false;
+    }
+  if(!SetFileTime(h, &t->timeCreation, &t->timeLastAccess, &t->timeLastWrite))
+    {
+    return false;
+    }
+#else
+  if(utime(fname, &t->timeBuf) < 0)
+    {
+    return false;
+    }
+#endif
+  return true;
+}
+
+//----------------------------------------------------------------------------
 static std::string cmSystemToolsExecutableDirectory;
 void cmSystemTools::FindExecutableDirectory(const char* argv0)
 {
diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index a7abc5f..18c4939 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -22,7 +22,7 @@
 #include <cmsys/SystemTools.hxx>
 #include <cmsys/Process.h>
 
-
+class cmSystemToolsFileTime;
 
 /** \class cmSystemTools
  * \brief A collection of useful functions for CMake.
@@ -363,6 +363,12 @@ public:
       the first argument to that named by the second.  */
   static bool CopyFileTime(const char* fromFile, const char* toFile);
 
+  /** Save and restore file times.  */
+  static cmSystemToolsFileTime* FileTimeNew();
+  static void FileTimeDelete(cmSystemToolsFileTime*);
+  static bool FileTimeGet(const char* fname, cmSystemToolsFileTime* t);
+  static bool FileTimeSet(const char* fname, cmSystemToolsFileTime* t);
+
   /** Find the directory containing the running executable.  Save it
    in a global location to be queried by GetExecutableDirectory
    later.  */
-- 
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