From 123dc70c503bf6ddb68b20ee1a47bc4726f975fc Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 14 Sep 2011 20:27:01 +0000
Subject: [PATCH] Add a simple routine to determine the typical system
 directory for temporary data.

llvm-svn: 139725
---
 llvm/include/llvm/Support/PathV2.h | 10 +++++++++-
 llvm/lib/Support/PathV2.cpp        | 30 ++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/Support/PathV2.h b/llvm/include/llvm/Support/PathV2.h
index 251563398fb4..8dfbd7784059 100644
--- a/llvm/include/llvm/Support/PathV2.h
+++ b/llvm/include/llvm/Support/PathV2.h
@@ -187,7 +187,7 @@ const StringRef root_name(StringRef path);
 /// @result The root directory of \a path if it has one, otherwise
 ///               "".
 const StringRef root_directory(StringRef path);
-
+  
 /// @brief Get root path.
 ///
 /// Equivalent to root_name + root_directory.
@@ -264,6 +264,14 @@ const StringRef extension(StringRef path);
 /// @result true if \a value is a path separator character on the host OS
 bool is_separator(char value);
 
+/// @brief Get the typical temporary directory for the system, e.g., 
+/// "/var/tmp" or "C:/TEMP"
+///
+/// @param erasedOnReboot Whether to favor a path that is erased on reboot
+/// rather than one that potentially persists longer.
+/// @param Result Holds the resulting path name.
+void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result);
+
 /// @brief Has root name?
 ///
 /// root_name != ""
diff --git a/llvm/lib/Support/PathV2.cpp b/llvm/lib/Support/PathV2.cpp
index c2880caa492a..4d969fe25f96 100644
--- a/llvm/lib/Support/PathV2.cpp
+++ b/llvm/lib/Support/PathV2.cpp
@@ -490,6 +490,36 @@ bool is_separator(char value) {
   }
 }
 
+void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result) {
+  result.clear();
+  
+  // Check whether the temporary directory is specified by an environment
+  // variable.
+  const char *EnvironmentVariable;
+#ifdef LLVM_ON_WIN32
+  EnvironmentVariable = "TEMP";
+#else
+  EnvironmentVariable = "TMPDIR";
+#endif
+  if (char *RequestedDir = getenv(EnvironmentVariable)) {
+    result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+    return;
+  }
+    
+  // Fall back to a system default.
+  const char *DefaultResult;
+#ifdef LLVM_ON_WIN32
+  (void)erasedOnReboot;
+  DefaultResult = "C:\TEMP";
+#else
+  if (erasedOnReboot)
+    DefaultResult = "/tmp";
+  else
+    DefaultResult = "/var/tmp";
+#endif
+  result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
+}
+  
 bool has_root_name(const Twine &path) {
   SmallString<128> path_storage;
   StringRef p = path.toStringRef(path_storage);