fix #71; bug fixes in types.nim

nimterop/types.nim

@@ -1,4 +1,33 @@
+#[
+TODO:
+this should pull as few dependencies as needed by the wrapper, one option is, for the types that carry a dependency, wrap the type declaration inside something like:
+```
+when defined(nimteropNeeds_va_list):
+  type
+    va_list* {.importc, header:"<stdarg.h>".} = object
+```
+
+TODO:
+nimterop should replace the generated wrappers with the nim-idiomatic version, eg:
+```
+proc mylib(a: ptrdiff_t) => proc mylib(a: ByteAddress)
+```
+]#
+
+from std/time_t import nil # for time_t
+
+export time_t
+
 type
-  time_t* = int32
   ptrdiff_t* = ByteAddress
-  va_list* {.importc: "va_list", header:"<stdarg.h>".} = object
+
+type
+  va_list* {.importc, header:"<stdarg.h>".} = object
+
+when defined(c):
+  # http://www.cplusplus.com/reference/cwchar/wchar_t/ In C++, wchar_t is a distinct fundamental type (and thus it is not defined in <cwchar> nor any other header).
+  type
+    wchar_t* {.importc, header:"<cwchar>".} = object
+elif defined(cpp):
+  type
+    wchar_t* {.importc.} = object