ram_{free,total}: system fallback if other fails

Author: scivision

+stdlib/ram_free.m

@@ -20,11 +20,15 @@
 
 function bytes = ram_free()
 
+bytes = 0;
+
 if stdlib.has_java()
   bytes = ram_free_java();
 elseif stdlib.has_python()
   bytes = py_ram_free();
-else
+end
+
+if bytes <= 0
   bytes = ram_free_system();
 end
 

+stdlib/ram_total.m

@@ -8,14 +8,17 @@
 
 function bytes = ram_total()
 
+bytes = 0;
 
 if stdlib.dotnet_api() >= 6
   % .NET is 2-3x faster than Java for this
   % https://learn.microsoft.com/en-us/dotnet/api/system.gcmemoryinfo.totalavailablememorybytes
   bytes = System.GC.GetGCMemoryInfo().TotalAvailableMemoryBytes;
 elseif stdlib.has_java()
   bytes = ram_total_java();
-else
+end
+
+if bytes <= 0
   bytes = ram_total_system();
 end