prompt reprinting fixes for readline when screenwidth is less than prompt length; redirection fixes

CWRU/CWRU.chlog

@@ -2086,3 +2086,22 @@ array.h
 				   ----
 lib/readline/terminal.c
 	- rl_term_kP: fix typo. Fix from Koichi Murase <myoga.murase@gmail.com>
+
+				   9/25
+				   ----
+lib/readline/display.c
+	- rl_clear_visible_line: call _rl_clear_to_eol with _rl_screenwidth as
+	  the argument so we clear out the entire line even if the terminal
+	  doesn't have a clear-to-eol sequence; make sure to add a call to
+	  rl_cr after that so we know we're always in column 0
+	- _rl_redisplay_after_sigwinch: just call rl_clear_visible_line instead	
+	  of erasing the last line of the display
+	- _rl_redisplay_after_sigwinch: if the prompt is longer than the screen
+	  width, make sure to call _rl_reset_prompt to recalculate the
+	  local_prompt_newlines array. Should fix issue from
+	  https://savannah.gnu.org/support/index.php?110543
+
+redir.c
+	- do_redirection_internal: if given [N]<&WORD- or [N]>&WORD- and WORD
+	  expands to null, make it identical to <&- or >&- and close file
+	  descriptor N (default 0). From a discussion back in 5/2021

config-top.h

@@ -114,7 +114,7 @@
 
 /* Define if you want the case-toggling operators (~[~]) and the
    `capcase' variable attribute (declare -c). */
-/* TAG: bash-5.2 disable */
+/* TAG: bash-5.2 disable? */
 #define CASEMOD_TOGGLECASE
 #define CASEMOD_CAPCASE
 

execute_cmd.c

@@ -367,7 +367,7 @@ executing_line_number ()
 	return currently_executing_command->value.ArithFor->line;
 #endif
 
-	return line_number;
+      return line_number;
     }
   else
     return line_number;

lib/readline/display.c

@@ -2588,7 +2588,8 @@ rl_clear_visible_line (void)
   for (curr_line = _rl_last_v_pos; curr_line >= 0; curr_line--)
     {
       _rl_move_vert (curr_line);
-      _rl_clear_to_eol (0);
+      _rl_clear_to_eol (_rl_screenwidth);
+      _rl_cr ();		/* in case we use space_to_eol() */
     }
 
   return 0;
@@ -3372,27 +3373,16 @@ _rl_redisplay_after_sigwinch (void)
      screen line. */
   if (_rl_term_cr)
     {
-      _rl_move_vert (_rl_vis_botlin);
-
-      _rl_cr ();
-      _rl_last_c_pos = 0;
-
-#if !defined (__MSDOS__)
-      if (_rl_term_clreol)
-	tputs (_rl_term_clreol, 1, _rl_output_character_function);
-      else
-#endif
-	{
-	  space_to_eol (_rl_screenwidth);
-	  _rl_cr ();
-	}
-
+      rl_clear_visible_line ();
       if (_rl_last_v_pos > 0)
 	_rl_move_vert (0);
     }
   else
     rl_crlf ();
 
+  if (_rl_screenwidth < prompt_visible_length)
+    _rl_reset_prompt ();		/* update local_prompt_newlines array */
+
   /* Redraw only the last line of a multi-line prompt. */
   t = strrchr (rl_display_prompt, '\n');
   if (t)

redir.c

@@ -808,8 +808,6 @@ do_redirection_internal (redirect, flags, fnp)
 	 continue. */
       redirectee_word = redirection_expand (redirectee);
 
-#if 0
-      /* TAG:bash-5.2 */
       /* XXX - what to do with [N]<&$w- where w is unset or null?  ksh93
 	       turns it into [N]<&- or [N]>&- and closes N. */
       if ((ri == r_move_input_word || ri == r_move_output_word) && redirectee_word == 0)
@@ -818,9 +816,7 @@ do_redirection_internal (redirect, flags, fnp)
 	  rd.dest = 0;
 	  new_redirect = make_redirection (sd, r_close_this, rd, 0);
 	}
-      else
-#endif
-      if (redirectee_word == 0)
+      else if (redirectee_word == 0)
 	return (AMBIGUOUS_REDIRECT);
       else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0')
 	{