[Support] Add sys::fs::set_current_path() (aka chdir)

Summary:
This adds a cross-platform way of setting the current working directory
analogous to the existing current_path() function used for retrieving
it. The function will be used in lldb.

Reviewers: rafael, silvas, zturner

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29035

llvm-svn: 292907

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index 30eaa8b278a..fb61cc7c26e 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -1135,4 +1135,23 @@ TEST_F(FileSystemTest, OpenFileForRead) {
 
   ::close(FileDescriptor);
 }
+
+TEST_F(FileSystemTest, set_current_path) {
+  SmallString<128> path;
+
+  ASSERT_NO_ERROR(fs::current_path(path));
+  ASSERT_NE(TestDirectory, path);
+
+  struct RestorePath {
+    SmallString<128> path;
+    RestorePath(const SmallString<128> &path) : path(path) {}
+    ~RestorePath() { fs::set_current_path(path); }
+  } restore_path(path);
+
+  ASSERT_NO_ERROR(fs::set_current_path(TestDirectory));
+
+  ASSERT_NO_ERROR(fs::current_path(path));
+  ASSERT_EQ(TestDirectory, path);
+}
+
 } // anonymous namespace