From cee8c5b5c7a37321104391393594a2c2fea5a096 Mon Sep 17 00:00:00 2001
From: ThorstenB <brehmt@gmail.com>
Date: Thu, 12 Jan 2012 21:44:15 +0100
Subject: [PATCH] #199: ADd method to return the absolute (real) path.

---
 simgear/misc/sg_path.cxx | 23 ++++++++++++++++++-----
 simgear/misc/sg_path.hxx |  6 ++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/simgear/misc/sg_path.cxx b/simgear/misc/sg_path.cxx
index 92a16945..e4b3cbf9 100644
--- a/simgear/misc/sg_path.cxx
+++ b/simgear/misc/sg_path.cxx
@@ -109,7 +109,7 @@ SGPath::SGPath(const SGPath& p) :
   _modTime(p._modTime)
 {
 }
-    
+
 SGPath& SGPath::operator=(const SGPath& p)
 {
   path = p.path;
@@ -142,12 +142,12 @@ void SGPath::set_cached(bool cached)
 // append another piece to the existing path
 void SGPath::append( const string& p ) {
     if ( path.size() == 0 ) {
-    path = p;
+        path = p;
     } else {
     if ( p[0] != sgDirPathSep ) {
         path += sgDirPathSep;
     }
-    path += p;
+        path += p;
     }
     fix();
     _cached = false;
@@ -163,9 +163,9 @@ void SGPath::add( const string& p ) {
 // path separator
 void SGPath::concat( const string& p ) {
     if ( path.size() == 0 ) {
-    path = p;
+        path = p;
     } else {
-    path += p;
+        path += p;
     }
     fix();
     _cached = false;
@@ -483,3 +483,16 @@ bool SGPath::rename(const SGPath& newName)
     return true;
 }
 
+std::string SGPath::realpath() const
+{
+#ifdef _WIN32
+    // Not implemented for Windows yet. Return original path instead.
+    return path;
+#else
+    char* buf = ::realpath(path.c_str(), NULL);
+    std::string p(buf);
+    free(buf);
+    return p;
+#endif
+}
+
diff --git a/simgear/misc/sg_path.hxx b/simgear/misc/sg_path.hxx
index 969eec0b..1f9dfbe7 100644
--- a/simgear/misc/sg_path.hxx
+++ b/simgear/misc/sg_path.hxx
@@ -111,6 +111,12 @@ public:
      */
     void concat( const std::string& p );
 
+    /**
+     * Returns a string with the absolute pathname that names the same file, whose
+     * resolution does not involve '.', '..', or symbolic links.
+     */
+    std::string realpath() const;
+
     /**
      * Get the file part of the path (everything after the last path sep)
      * @return file string