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

lib/System/SunOS/Path.cpp

@@ -0,0 +1,38 @@
+//===- llvm/System/SunOS/Path.cpp - SunOS Path Implementation ---*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the SunOS specific implementation of the Path class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only SunOS specific code 
+//===          and must not be generic UNIX code (see ../Unix/Path.cpp)
+//===----------------------------------------------------------------------===//
+
+// 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