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, 4 insertions, 0 deletions

diff --git a/source/core/slang-string-util.h b/source/core/slang-string-util.h
index 0579dd057..3547fd97c 100644
--- a/source/core/slang-string-util.h
+++ b/source/core/slang-string-util.h
@@ -63,6 +63,10 @@ struct StringUtil
         /// Returns an empty string if blob is nullptr 
     static String getString(ISlangBlob* blob);
 
+        /// Given a string or slice, replaces all instances of fromChar with toChar
+    static String calcCharReplaced(const UnownedStringSlice& slice, char fromChar, char toChar);
+    static String calcCharReplaced(const String& string, char fromChar, char toChar);
+    
         /// Create a blob from a string
     static ComPtr<ISlangBlob> createStringBlob(const String& string);
 };