Revise the design of the Path concept per peer review. Too many changes to

note individually but these essence of it is to not derive from
std::string, clarify the interface, and provide better documentation.
There is now also (untested) implementations for AIX, Darwin, and SunOS.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16078 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 2 deletions

diff --git a/lib/System/Linux/Path.cpp b/lib/System/Linux/Path.cpp
index 5c73d0176a..e7efd2fb95 100644
--- a/lib/System/Linux/Path.cpp
+++ b/lib/System/Linux/Path.cpp
@@ -13,8 +13,26 @@
 
 //===----------------------------------------------------------------------===//
 //=== WARNING: Implementation here must contain only Linux specific code 
-//===          and must not be generic UNIX code (see ../Unix)
+//===          and must not be generic UNIX code (see ../Unix/Path.cpp)
 //===----------------------------------------------------------------------===//
 
-// Th..Th..Th..Tha's All Folks!
+// Include the generic Unix implementation
 #include "../Unix/Path.cpp"
+
+namespace llvm {
+using namespace sys;
+
+bool 
+Path::is_valid() const {
+  if (path.empty()) 
+    return false;
+  char pathname[MAXPATHLEN];
+  if (0 == realpath(path.c_str(), pathname))
+    if (errno != EACCES && errno != EIO && errno != ENOENT && errno != ENOTDIR)
+      return false;
+  return true;
+}
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab