Merge TempDir and system_temp_directory.

We had two functions for finding the temp or cache directory. Each had a
different set of smarts about OS specific APIs.

With this patch system_temp_directory becomes the only way to do it.

llvm-svn: 216460

1 files changed, 45 insertions, 17 deletions

diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index a57f252fbfc..b09c1989699 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -49,23 +49,6 @@ static std::error_code windows_error(DWORD E) {
   return mapWindowsError(E);
 }
 
-static std::error_code TempDir(SmallVectorImpl<char> &Result) {
-  SmallVector<wchar_t, 64> Res;
-retry_temp_dir:
-  DWORD Len = ::GetTempPathW(Res.capacity(), Res.begin());
-
-  if (Len == 0)
-    return windows_error(::GetLastError());
-
-  if (Len > Res.capacity()) {
-    Res.reserve(Len);
-    goto retry_temp_dir;
-  }
-
-  Res.set_size(Len);
-  return UTF16ToUTF8(Res.begin(), Res.size(), Result);
-}
-
 static bool is_separator(const wchar_t value) {
   switch (value) {
   case L'\\':
@@ -862,6 +845,51 @@ bool home_directory(SmallVectorImpl<char> &result) {
   return true;
 }
 
+static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
+  SmallVector<wchar_t, 128> NameUTF16;
+  if (windows::UTF8ToUTF16(Var, NameUTF16))
+    return false;
+
+  SmallVector<wchar_t, 1024> Buf;
+  size_t Size = 1024;
+  do {
+    Buf.reserve(Size);
+    Size =
+        GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
+    if (Size == 0)
+      return false;
+
+    // Try again with larger buffer.
+  } while (Size > Buf.capacity());
+  Buf.set_size(Size);
+
+  if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
+    return false;
+  return true;
+}
+
+static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
+  const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
+  for (const char *Env : EnvironmentVariables) {
+    if (getTempDirEnvVar(Env, Res))
+      return true;
+  }
+  return false;
+}
+
+void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
+  (void)ErasedOnReboot;
+  Result.clear();
+
+  // Check whether the temporary directory is specified by an environment
+  // variable.
+  if (getTempDirEnvVar(Result))
+    return;
+
+  // Fall back to a system default.
+  const char *DefaultResult = "C:\\TEMP";
+  Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
+}
 } // end namespace path
 
 namespace windows {