added another func

Source/cmCPluginAPI.cxx

@@ -386,6 +386,12 @@ const char *cmSourceFileGetSourceName(void *arg)
   return sf->GetSourceName().c_str();
 }
 
+const char *cmSourceFileGetFullPath(void *arg)
+{
+  cmSourceFile *sf = static_cast<cmSourceFile *>(arg);
+  return sf->GetFullPath().c_str();
+}
+
 const char *cmSourceFileGetProperty(void *arg,const char *prop)
 {
   cmSourceFile *sf = static_cast<cmSourceFile *>(arg);
@@ -508,6 +514,7 @@ cmCAPI cmStaticCAPI =
   cmSourceFileGetProperty,
   cmSourceFileGetPropertyAsBool,
   cmSourceFileGetSourceName,
+  cmSourceFileGetFullPath,
   cmSourceFileSetName,
   cmSourceFileSetName2,
   cmSourceFileSetProperty,

Source/cmCPluginAPI.h

@@ -118,6 +118,7 @@ typedef struct
   const char *(*SourceFileGetProperty) (void *sf, const char *prop);
   int   (*SourceFileGetPropertyAsBool) (void *sf, const char *prop);
   const char *(*SourceFileGetSourceName) (void *sf);
+  const char *(*SourceFileGetFullPath) (void *sf);
   void  (*SourceFileSetName) (void *sf, const char* name, const char* dir,
                              int numSourceExtensions,
                              const char **sourceExtensions,