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, 17 insertions, 1 deletions

diff --git a/source/core/slang-io.cpp b/source/core/slang-io.cpp
index f1948200c..cf099aa04 100644
--- a/source/core/slang-io.cpp
+++ b/source/core/slang-io.cpp
@@ -174,6 +174,21 @@ namespace Slang
         }
     }
 
+    /* static */bool Path::IsRelative(const UnownedStringSlice& path)
+    {
+        List<UnownedStringSlice> split;
+        Split(path, split);
+
+        for (const auto& cur : split)
+        {
+            if (cur == "." || cur == "..")
+            {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /* static */String Path::Simplify(const UnownedStringSlice& path)
     {
         List<UnownedStringSlice> split;
@@ -208,7 +223,7 @@ namespace Slang
         {
             split.Add(UnownedStringSlice::fromLiteral("."));
         }
-
+   
         // Reconstruct the string
         StringBuilder builder;
         for (int i = 0; i < int(split.Count()); i++)
@@ -219,6 +234,7 @@ namespace Slang
             }
             builder.Append(split[i]);
         }
+
         return builder;
     }