Fix a possible bug in path normalization code.

The NormalizePath() function always added a trailing separator when
normalizing environment variables.  Now it checks an environment
variable for a trailing separator and only adds one if it doesn't
already exist.

May be a partial fix for:

Fixes lp:1733217

https://bugs.launchpad.net/kicad/+bug/1733217

common/env_paths.cpp

@@ -56,7 +56,7 @@ static bool normalizeAbsolutePaths( const wxFileName& aPathA,
     {
         while( i < bDirs.GetCount() )
         {
-            *aResultPath += bDirs[i] + wxT( "/" );
+            *aResultPath += bDirs[i] + "/";
             i++;
         }
     }
@@ -70,6 +70,7 @@ wxString NormalizePath( const wxFileName& aFilePath, const ENV_VAR_MAP* aEnvVars
 {
     wxFileName envPath;
     wxString tmp, varName, normalizedFullPath;
+    bool hasTrailingSeparator = false;
 
     if( aEnvVars )
     {
@@ -80,6 +81,12 @@ wxString NormalizePath( const wxFileName& aFilePath, const ENV_VAR_MAP* aEnvVars
                 || !wxFileName::IsDirReadable( entry.second.GetValue() ) )
                 continue;
 
+            // Do not add separator to the end of environment variable if it already has one.
+            wxUniChar separator = entry.second.GetValue().Last();
+
+            if( separator == '\\' || separator == '/' )
+                hasTrailingSeparator = true;
+
             envPath.SetPath( entry.second.GetValue() );
 
             if( normalizeAbsolutePaths( envPath, aFilePath, &tmp ) )
@@ -100,7 +107,10 @@ wxString NormalizePath( const wxFileName& aFilePath, const ENV_VAR_MAP* aEnvVars
 
     if( !varName.IsEmpty() )
     {
-        normalizedFullPath = wxString::Format( "${%s}/", varName );
+        normalizedFullPath = wxString::Format( "${%s}", varName );
+
+        if( !hasTrailingSeparator )
+            normalizedFullPath += "/";
 
         if( !tmp.IsEmpty() )
             normalizedFullPath += tmp;

include/env_paths.h

@@ -28,10 +28,10 @@
 #include <pgm_base.h>
 
 /**
- * Normalizes a file path to an environmental variable, if possible.
+ * Normalize a file path to an environmental variable, if possible.
  *
  * @param aFilePath is the full file path (path and file name) to be normalized.
- * @param aEnvVars is an optional map of environmental variables to try substition with.
+ * @param aEnvVars is an optional map of environmental variables to try substitution with.
  * @param aProject is an optional project, to normalize the file path to the project path.
  * @return Normalized full file path (path and file name) if succeeded or empty string if the
  *          path could not be normalized.
@@ -40,12 +40,12 @@ wxString NormalizePath( const wxFileName& aFilePath, const ENV_VAR_MAP* aEnvVars
         const PROJECT* aProject );
 
 /**
- * Searches the default paths trying to find one with the requested file.
+ * Search the default paths trying to find one with the requested file.
  *
  * @param aFileName is the name of the searched file. It might be a relative path.
  * @param aEnvVars is an optional map of environmental variables that can contain paths.
  * @param aProject is an optional project, to check the project path.
- * @return Full path (apth and file name) if the file was found in one of the paths, otherwise
+ * @return Full path (path and file name) if the file was found in one of the paths, otherwise
  *         an empty string.
 */
 wxString ResolveFile( const wxString& aFileName, const ENV_VAR_MAP* aEnvVars,