Path simplification/hash mode, plus bug fixes (#788)

* * Fix memory bug around expanding va_args - needed buffer to have space for terminating 0
* Fix problem with FileWriter defaults being globals, as memory they allocate, will only be freed after return from main - work around by making StdWriters RefObject derived, and kept in scope such the writers are destroyed before checks for leaks is found
* Added SimplifyPathAndHash mode for CacheFileSystem - will simplify the path and see if simplified path is in cache before reading file (limiting amout of underlying file requests)

* * Added calcReplaceChar
* Renamed DefaultFileSystem to OSFileSystem
* Made OSFileSystem convert windows \ to / on linux

* Simplified logic for caching in CacheFileSystem.

* Added pragma-once-c to add extra test, but also so there is an 'include' directory in preprocessor tests.

* Small fixes in pragma once test.

* Simplified cache handling path, so that paths/simplified paths area always added.

* Improve naming of methods for different caches.

1 files changed, 5 insertions, 1 deletions

diff --git a/source/core/slang-io.h b/source/core/slang-io.h
index 3703aee08..177671442 100644
--- a/source/core/slang-io.h
+++ b/source/core/slang-io.h
@@ -43,10 +43,14 @@ namespace Slang
         static String Simplify(const UnownedStringSlice& path);
         static String Simplify(const String& path) { return Simplify(path.getUnownedSlice()); }
 
+            /// Returns true if a path contains a . or ..
+        static bool IsRelative(const UnownedStringSlice& path);
+        static bool IsRelative(const String& path) { return IsRelative(path.getUnownedSlice()); }
+
         static SlangResult GetPathType(const String & path, SlangPathType* pathTypeOut);
 
         static SlangResult GetCanonical(const String & path, String& canonicalPathOut);
 	};
 }
 
-#endif
\ No newline at end of file
+#endif