From 02dbf65dee8f6eb4cabf480077d4e752b82a6601 Mon Sep 17 00:00:00 2001
From: KWSys Upstream <kwrobot@kitware.com>
Date: Tue, 21 Jun 2022 10:17:54 -0400
Subject: KWSys 2022-06-21 (d427a180)

Code extracted from:

    https://gitlab.kitware.com/utils/kwsys.git

at commit d427a18072e2f37108aeeadf41ed4a21b4be3ab1 (master).

Upstream Shortlog
-----------------

Clemens Wasser (2):
      ab7c8f6f SystemTools: Factor out RemoveTrailingSlashes
      ca9646bd SystemTools: Optimize FileIsExecutable on Windows
---
 SystemTools.cxx | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/SystemTools.cxx b/SystemTools.cxx
index 5889a4b..89a3cc7 100644
--- a/SystemTools.cxx
+++ b/SystemTools.cxx
@@ -3067,17 +3067,14 @@ std::string SystemTools::GetRealPath(const std::string& path,
   return ret;
 }
 
-bool SystemTools::FileIsDirectory(const std::string& inName)
+// Remove any trailing slash from the name except in a root component.
+static const char* RemoveTrailingSlashes(
+  const std::string& inName, char (&local_buffer)[KWSYS_SYSTEMTOOLS_MAXPATH],
+  std::string& string_buffer)
 {
-  if (inName.empty()) {
-    return false;
-  }
   size_t length = inName.size();
   const char* name = inName.c_str();
 
-  // Remove any trailing slash from the name except in a root component.
-  char local_buffer[KWSYS_SYSTEMTOOLS_MAXPATH];
-  std::string string_buffer;
   size_t last = length - 1;
   if (last > 0 && (name[last] == '/' || name[last] == '\\') &&
       strcmp(name, "/") != 0 && name[last - 1] != ':') {
@@ -3091,6 +3088,19 @@ bool SystemTools::FileIsDirectory(const std::string& inName)
     }
   }
 
+  return name;
+}
+
+bool SystemTools::FileIsDirectory(const std::string& inName)
+{
+  if (inName.empty()) {
+    return false;
+  }
+
+  char local_buffer[KWSYS_SYSTEMTOOLS_MAXPATH];
+  std::string string_buffer;
+  const auto name = RemoveTrailingSlashes(inName, local_buffer, string_buffer);
+
 // Now check the file node type.
 #if defined(_WIN32)
   DWORD attr =
@@ -3107,9 +3117,21 @@ bool SystemTools::FileIsDirectory(const std::string& inName)
   }
 }
 
-bool SystemTools::FileIsExecutable(const std::string& name)
+bool SystemTools::FileIsExecutable(const std::string& inName)
 {
-  return !FileIsDirectory(name) && TestFileAccess(name, TEST_FILE_EXECUTE);
+#ifdef _WIN32
+  char local_buffer[KWSYS_SYSTEMTOOLS_MAXPATH];
+  std::string string_buffer;
+  const auto name = RemoveTrailingSlashes(inName, local_buffer, string_buffer);
+  const auto attr =
+    GetFileAttributesW(Encoding::ToWindowsExtendedPath(name).c_str());
+
+  // On Windows any file that exists and is not a directory is considered
+  // readable and therefore also executable:
+  return attr != INVALID_FILE_ATTRIBUTES && !(attr & FILE_ATTRIBUTE_DIRECTORY);
+#else
+  return !FileIsDirectory(inName) && TestFileAccess(inName, TEST_FILE_EXECUTE);
+#endif
 }
 
 #if defined(_WIN32)
-- 
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