X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fexternal-formats%2Fmb-util.lisp;h=5569a9fcac02fb3585296547644475f9d431e083;hb=cd1b14acf6f548b28b8a14e554d779f0473122ec;hp=c76bc423fee6b0d736f03cf8d7b47d939efe222f;hpb=75476d1d19ac3d7239c8963a498c447a8368433d;p=sbcl.git

diff --git a/src/code/external-formats/mb-util.lisp b/src/code/external-formats/mb-util.lisp
index c76bc42..5569a9f 100644
--- a/src/code/external-formats/mb-util.lisp
+++ b/src/code/external-formats/mb-util.lisp
@@ -248,7 +248,15 @@
 
        ;; for fd-stream.lisp
        (define-external-format/variable-width ,aliases t
-         (mb-char-len (or (,ucs-to-mb (char-code byte)) -1))
+         ;; KLUDGE: it so happens that at present (2009-10-22) none of
+         ;; the external formats defined with
+         ;; define-multibyte-encoding can encode the unicode
+         ;; replacement character, so we hardcode the preferred
+         ;; replacement here.
+         #\?
+         (block size
+           (mb-char-len (or (,ucs-to-mb (char-code byte))
+                            (return-from size 0))))
          (let ((mb (,ucs-to-mb bits)))
            (if (null mb)
                (external-format-encoding-error stream byte)
@@ -259,7 +267,7 @@
                  (3 (setf (sap-ref-8 sap tail) (ldb (byte 8 16) mb)
                           (sap-ref-8 sap (1+ tail)) (ldb (byte 8 8) mb)
                           (sap-ref-8 sap (+ 2 tail)) (ldb (byte 8 0) mb))))))
-         (,mb-len byte)
+         (1 (,mb-len byte))
          (let* ((mb (ecase size
                       (1 byte)
                       (2 (let ((byte2 (sap-ref-8 sap (1+ head))))