From 4b2667930b54a906a65daa864b9774e390f004c6 Mon Sep 17 00:00:00 2001
From: Kaelyn Uhrain <rikka@google.com>
Date: Wed, 20 Jun 2012 20:21:33 +0000
Subject: [PATCH] Check that a file is not a directory before reading it into a
 MemoryBuffer.

llvm-svn: 158841
---
 lib/Support/MemoryBuffer.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 16e5c7a9f72..fabf1406acb 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -17,6 +17,7 @@
 #include "llvm/Config/config.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Errno.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Program.h"
@@ -214,6 +215,14 @@ error_code MemoryBuffer::getFile(const char *Filename,
                                  OwningPtr<MemoryBuffer> &result,
                                  int64_t FileSize,
                                  bool RequiresNullTerminator) {
+  // First check that the "file" is not a directory
+  bool is_dir = false;
+  error_code err = sys::fs::is_directory(Filename, is_dir);
+  if (err)
+    return err;
+  else if (is_dir)
+    return make_error_code(errc::is_a_directory);
+
   int OpenFlags = O_RDONLY;
 #ifdef O_BINARY
   OpenFlags |= O_BINARY;  // Open input file in binary mode on win32.