Implement HOST-BIG-ENDIAN?.

diff --git a/v7/src/runtime/global.scm b/v7/src/runtime/global.scm
index 6b795620ccbd4893b216f0c71ba1f300c9580121..0e54bedaa66ad1fa730215411b412a514cf6c15c 100644 (file)
--- a/v7/src/runtime/global.scm
+++ b/v7/src/runtime/global.scm
@@ -1,8 +1,9 @@
 #| -*-Scheme-*-
 
-$Id: global.scm,v 14.59 2003/02/14 18:28:32 cph Exp $
+$Id: global.scm,v 14.60 2003/04/14 18:19:23 cph Exp $
 
-Copyright (c) 1988-2001 Massachusetts Institute of Technology
+Copyright 1988,1989,1991,1992,1993,1995 Massachusetts Institute of Technology
+Copyright 1998,2000,2001,2003 Massachusetts Institute of Technology
 
 This file is part of MIT/GNU Scheme.
 
@@ -69,6 +70,19 @@ USA.
   (system-vector-length system-vector-size)
   system-vector-ref
   system-vector-set!)
+
+(define (host-big-endian?)
+  ;; Assumptions:
+  ;; * Word length is 32 or 64 bits.
+  ;; * Type codes are at most 8 bits.
+  ;; * Zero is a non-pointer type code.
+  (case (object-datum
+        (vector-ref (object-new-type (ucode-type vector)
+                                     "\000\001\002\000\000\003\004\000")
+                    1))
+    ((#x00010200 #x0001020000030400) #t)
+    ((#x00020100 #x0004030000020100) #f)
+    (else (error "Unable to determine endianness of host."))))
 \f
 ;;;; Potpourri
 

diff --git a/v7/src/runtime/runtime.pkg b/v7/src/runtime/runtime.pkg
index 23f58d1a90173846dd27e7aaeffa98c2c0ca9a73..e27c284fbbfcbf7f34c3d26b3b6a5cd52b0e43b5 100644 (file)
--- a/v7/src/runtime/runtime.pkg
+++ b/v7/src/runtime/runtime.pkg
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Id: runtime.pkg,v 14.440 2003/03/21 17:51:09 cph Exp $
+$Id: runtime.pkg,v 14.441 2003/04/14 18:19:26 cph Exp $
 
 Copyright 1988,1989,1990,1991,1992,1993 Massachusetts Institute of Technology
 Copyright 1994,1995,1996,1997,1998,1999 Massachusetts Institute of Technology
@@ -292,6 +292,7 @@ USA.
          hook/exit
          hook/quit
          hook/scode-eval
+         host-big-endian?
          hunk3-cons
          identity-procedure
          impurify