From: Leo <sdl.web@gmail.com>
To: emacs-devel@gnu.org
Subject: Can UNREAD completely undo READCHAR?
Date: Tue, 28 Dec 2010 20:34:11 +0000 [thread overview]
Message-ID: <m1ei9163i4.fsf@cam.ac.uk> (raw)
Hello all,
I tried the following experiment (as in the attached patch) and emacs
failed to dump. Any ideas? Thanks in advance.
(gdb) r -batch -l loadup
Starting program: /Users/Shared/emacs/src/temacs -batch -l loadup
Reading symbols for shared libraries .++++++++++++........................................................................................ done
Loading loadup.el (source)...
Using load-path (/Users/Shared/emacs/lisp)
Loading emacs-lisp/byte-run...
Invalid read syntax: "#"
Program exited with code 0377.
(gdb) bt
No stack.
(gdb)
diff --git a/src/lread.c b/src/lread.c
index 94d47d5..e28e70a 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -1664,7 +1664,7 @@ readevalloop (readcharfun, stream, sourcename, evalfun,
Lisp_Object unibyte, readfun;
Lisp_Object start, end;
{
- register int c;
+ register int c, c2;
register Lisp_Object val;
int count = SPECPDL_INDEX ();
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
@@ -1760,6 +1760,9 @@ readevalloop (readcharfun, stream, sourcename, evalfun,
|| c == 0x8a0) /* NBSP */
goto read_next;
+ c2 = READCHAR;
+ UNREAD (c2);
+
if (!NILP (Vpurify_flag) && c == '(')
{
record_unwind_protect (unreadpure, Qnil);
Leo
next reply other threads:[~2010-12-28 20:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-28 20:34 Leo [this message]
2010-12-28 22:10 ` Can UNREAD completely undo READCHAR? Andreas Schwab
2010-12-29 8:43 ` Leo
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