Fix unsafe SDATA usage in print.c (bug#78590)

* src/print.c (print_string_1): Renamed from 'print_string', with an
extra argument to disable nonascii escaping.
(print_string): New function.
(print_object): Use 'print_string_1', not 'strout'.

1 files changed, 10 insertions, 4 deletions

diff --git a/src/print.c b/src/print.c
index b17ec337f70..b6ee89478c7 100644
--- a/src/print.c
+++ b/src/print.c
@@ -469,18 +469,18 @@ strout (const char *ptr, ptrdiff_t size, ptrdiff_t size_byte,
    because printing one char can relocate.  */
 
 static void
-print_string (Lisp_Object string, Lisp_Object printcharfun)
+print_string_1 (Lisp_Object string, Lisp_Object printcharfun, bool escape_nonascii)
 {
   if (EQ (printcharfun, Qt) || NILP (printcharfun))
     {
       ptrdiff_t chars;
 
-      if (print_escape_nonascii)
+      if (escape_nonascii)
         string = string_escape_byte8 (string);
 
       if (STRING_MULTIBYTE (string))
         chars = SCHARS (string);
-      else if (! print_escape_nonascii
+      else if (! escape_nonascii
                && (EQ (printcharfun, Qt)
                    ? ! NILP (BVAR (&buffer_defaults, enable_multibyte_characters))
                    : ! NILP (BVAR (current_buffer, enable_multibyte_characters))))
@@ -543,6 +543,12 @@ print_string (Lisp_Object string, Lisp_Object printcharfun)
           }
     }
 }
+
+static void
+print_string (Lisp_Object string, Lisp_Object printcharfun)
+{
+  print_string_1 (string, printcharfun, print_escape_nonascii);
+}
 
 DEFUN ("write-char", Fwrite_char, Swrite_char, 1, 2, 0,
        doc: /* Output character CHARACTER to stream PRINTCHARFUN.
@@ -2282,7 +2288,7 @@ print_object (Lisp_Object obj, Lisp_Object printcharfun, bool escapeflag)
         }
       else if (STRINGP (num))
         {
-          strout (SSDATA (num), SCHARS (num), SBYTES (num), printcharfun);
+          print_string_1 (num, printcharfun, false);
           goto next_obj;
         }
     }