[Bug 205697] vi gets confused and corrupts file being edited

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205697

--- Comment #4 from Bjorn Robertsson <bjornr at iceland2000.com> ---
(In reply to Michael Dexter from comment #3)

I have used this patch for 11.0, (from
https://lists.freebsd.org/pipermail/freebsd-bugs/2015-August/063464.html), but
note the couple more matches in the FreeBSD bug list:
New         |    202740 | vi/ex string substitution problem when there is m 
New         |    202290 | /usr/bin/vi conversion error on valid character   



Index: contrib/nvi/common/encoding.c
===================================================================
--- contrib/nvi/common/encoding.c       (revision 292832)
+++ contrib/nvi/common/encoding.c       (working copy)
@@ -96,7 +96,7 @@
                                if (i >= nbytes)
                                        goto done;

-                               if (buf[i] & 0x40)      /* 10xxxxxx */
+                               if ((buf[i] & 0xc0) != 0x80)    /* 10xxxxxx */
                                        return -1;
                        }

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