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)

1 files changed, 2 insertions, 3 deletions

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.  */