From: Po Lu <luangruo@yahoo.com>
Date: Wed, 27 Jul 2022 09:39:14 +0000 (+0800)
Subject: Fix invalid current buffer after print-unreadable-function signals
X-Git-Tag: emacs-29.0.90~1447^2~730
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=bfa951cdfad482a106bed11e4f11cedfad58570a;p=emacs.git

Fix invalid current buffer after print-unreadable-function signals

* src/print.c (PRINTPREPARE): Remove `old' and
record_unwind_current_buffer instead.
(PRINTFINISH): Stop restoring `old'.  (bug#56773)
---

diff --git a/src/print.c b/src/print.c
index b5a621f80aa..6218c76224c 100644
--- a/src/print.c
+++ b/src/print.c
@@ -98,7 +98,6 @@ bool print_output_debug_flag EXTERNALLY_VISIBLE = 1;
    or call strout to output a block of characters.  */
 
 #define PRINTPREPARE							\
-   struct buffer *old = current_buffer;					\
    ptrdiff_t old_point = -1, start_point = -1;				\
    ptrdiff_t old_point_byte = -1, start_point_byte = -1;		\
    specpdl_ref specpdl_count = SPECPDL_INDEX ();			\
@@ -106,6 +105,7 @@ bool print_output_debug_flag EXTERNALLY_VISIBLE = 1;
    bool multibyte							\
      = !NILP (BVAR (current_buffer, enable_multibyte_characters));	\
    Lisp_Object original = printcharfun;					\
+   record_unwind_current_buffer ();					\
    if (NILP (printcharfun)) printcharfun = Qt;				\
    if (BUFFERP (printcharfun))						\
      {									\
@@ -192,8 +192,7 @@ bool print_output_debug_flag EXTERNALLY_VISIBLE = 1;
      SET_PT_BOTH (old_point + (old_point >= start_point			\
 			       ? PT - start_point : 0),			\
 		  old_point_byte + (old_point_byte >= start_point_byte	\
-				    ? PT_BYTE - start_point_byte : 0));	\
-   set_buffer_internal (old);
+				    ? PT_BYTE - start_point_byte : 0));
 
 /* This is used to restore the saved contents of print_buffer
    when there is a recursive call to print.  */