Replacement for stddef.h in the JS interpreter which defines ptrdiff_t to be 32 bits rather than 16 bits on Win16 only

git-svn-id: svn://10.0.0.236/trunk@3559 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/js/src/jsstddef.h

@@ -0,0 +1,41 @@
+/*stddef inclusion here to first declare ptrdif as a signed long instead of a signed int*/
+
+#ifdef _WINDOWS
+# ifndef XP_WIN
+# define XP_WIN
+# endif
+#if defined(_WIN32) || defined(WIN32)
+# ifndef XP_WIN32
+# define XP_WIN32
+# endif
+#else
+# ifndef XP_WIN16
+# define XP_WIN16
+# endif
+#endif
+#endif
+
+#ifdef XP_WIN16
+#ifndef _PTRDIFF_T_DEFINED
+typedef long ptrdiff_t;
+
+/*
+ * The Win16 compiler treats pointer differences as 16-bit signed values.
+ * This macro allows us to treat them as 17-bit signed values, stored in
+ * a 32-bit type.
+ */
+#define PTRDIFF(p1, p2, type)                                 \
+    ((((unsigned long)(p1)) - ((unsigned long)(p2))) / sizeof(type))
+
+#define _PTRDIFF_T_DEFINED
+#endif /*_PTRDIFF_T_DEFINED*/
+#else /*WIN16*/
+
+#define PTRDIFF(p1, p2, type)                                 \
+	((p1) - (p2))
+	
+#endif
+
+#include <stddef.h>
+
+