Remove unnecessary casts from TUI

This removes a number of unnecessary casts from the TUI.  Some were
found with -Wuseless-cast (which, I think, can't easily be enabled for
gdb); and some were found by inspection.

Tested by rebuilding on x86-64 Fedora 28.
I'm checking this in.

gdb/ChangeLog
2018-10-15  Tom Tromey  <tom@tromey.com>

	* tui/tui.c (strcat_to_buf): Remove casts.
	* tui/tui-winsource.c (tui_show_source_line)
	(tui_set_is_exec_point_at, tui_line_is_displayed): Remove casts.
	* tui/tui-wingeneral.c (tui_refresh_win, box_win): Remove casts.
	* tui/tui-windata.c (tui_first_data_item_displayed)
	(tui_delete_data_content_windows, tui_erase_data_content)
	(tui_display_all_data, tui_display_data_from)
	(tui_refresh_data_win, tui_vertical_data_scroll): Remove casts.
	* tui/tui-win.c (tui_set_win_height)
	(make_invisible_and_set_new_height, parse_scrolling_args): Remove
	casts.
	* tui/tui-win.c (tui_resize_all): Remove casts.
	(tui_scroll_backward_command, tui_set_focus)
	(tui_set_tab_width_command): Likewise.
	* tui/tui-source.c (tui_vertical_source_scroll): Remove cast.
	* tui/tui-regs.c (tui_show_register_group): Remove cast.
	* tui/tui-layout.c (tui_set_layout_by_name): Remove cast.
	* tui/tui-disasm.c (tui_vertical_disassem_scroll): Remove cast.
	* tui/tui-data.c (tui_partial_win_by_name, tui_free_win_content):
	Remove casts.

gdb/ChangeLog

@@ -1,3 +1,26 @@
+2018-10-15  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui.c (strcat_to_buf): Remove casts.
+	* tui/tui-winsource.c (tui_show_source_line)
+	(tui_set_is_exec_point_at, tui_line_is_displayed): Remove casts.
+	* tui/tui-wingeneral.c (tui_refresh_win, box_win): Remove casts.
+	* tui/tui-windata.c (tui_first_data_item_displayed)
+	(tui_delete_data_content_windows, tui_erase_data_content)
+	(tui_display_all_data, tui_display_data_from)
+	(tui_refresh_data_win, tui_vertical_data_scroll): Remove casts.
+	* tui/tui-win.c (tui_set_win_height)
+	(make_invisible_and_set_new_height, parse_scrolling_args): Remove
+	casts.
+	* tui/tui-win.c (tui_resize_all): Remove casts.
+	(tui_scroll_backward_command, tui_set_focus)
+	(tui_set_tab_width_command): Likewise.
+	* tui/tui-source.c (tui_vertical_source_scroll): Remove cast.
+	* tui/tui-regs.c (tui_show_register_group): Remove cast.
+	* tui/tui-layout.c (tui_set_layout_by_name): Remove cast.
+	* tui/tui-disasm.c (tui_vertical_disassem_scroll): Remove cast.
+	* tui/tui-data.c (tui_partial_win_by_name, tui_free_win_content):
+	Remove casts.
+
 2018-10-15  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* MAINTAINERS (Responsible Maintainers): Add Alan Hayward as

gdb/tui/tui-data.c

@@ -375,7 +375,7 @@ tui_partial_win_by_name (const char *name)
 {
   struct tui_win_info *win_info = NULL;
 
-  if (name != (char *) NULL)
+  if (name != NULL)
     {
       int i = 0;
 
@@ -766,7 +766,7 @@ tui_free_win_content (struct tui_gen_win_info *win_info)
 {
   if (win_info->content != NULL)
     {
-      free_content ((tui_win_content) win_info->content,
+      free_content (win_info->content,
 		   win_info->content_size,
 		   win_info->type);
       win_info->content = NULL;

gdb/tui/tui-disasm.c

@@ -384,7 +384,7 @@ tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
       struct tui_line_or_address val;
       int dir;
 
-      content = (tui_win_content) TUI_DISASM_WIN->generic.content;
+      content = TUI_DISASM_WIN->generic.content;
 
       pc = content[0]->which_element.source.line_or_addr.u.addr;
       num_to_scroll++;

gdb/tui/tui-layout.c

@@ -401,7 +401,7 @@ tui_set_layout_by_name (const char *layout_name)
 {
   enum tui_status status = TUI_SUCCESS;
 
-  if (layout_name != (char *) NULL)
+  if (layout_name != NULL)
     {
       int i;
       enum tui_layout_type new_layout = UNDEFINED_LAYOUT;

gdb/tui/tui-regs.c

@@ -247,8 +247,7 @@ tui_show_register_group (struct reggroup *group,
 	  TUI_DATA_WIN->generic.content = NULL;
 	  TUI_DATA_WIN->generic.content_size = 0;
 	  tui_add_content_elements (&TUI_DATA_WIN->generic, nr_regs);
-	  display_info->regs_content
+	  display_info->regs_content = TUI_DATA_WIN->generic.content;
-            = (tui_win_content) TUI_DATA_WIN->generic.content;
 	  display_info->regs_content_count = nr_regs;
 	}
 

gdb/tui/tui-source.c

@@ -351,7 +351,7 @@ tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,
     {
       struct tui_line_or_address l;
       struct symtab *s;
-      tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;
+      tui_win_content content = TUI_SRC_WIN->generic.content;
       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 
       if (cursal.symtab == (struct symtab *) NULL)

gdb/tui/tui-win.c

@@ -793,7 +793,7 @@ tui_resize_all (void)
        {
 	case SRC_COMMAND:
 	case DISASSEM_COMMAND:
-	  first_win = (struct tui_win_info *) (tui_source_windows ())->list[0];
+	  first_win = tui_source_windows ()->list[0];
 	  first_win->generic.width += width_diff;
 	  locator->width += width_diff;
 	  /* Check for invalid heights.  */
@@ -830,8 +830,7 @@ tui_resize_all (void)
 	    {
 	      first_win = TUI_DATA_WIN;
 	      first_win->generic.width += width_diff;
-	      second_win = (struct tui_win_info *)
+	      second_win = tui_source_windows ()->list[0];
-		(tui_source_windows ())->list[0];
 	      second_win->generic.width += width_diff;
 	    }
 	  /* Change the first window's height/width.  */
@@ -984,7 +983,7 @@ tui_scroll_forward_command (const char *arg, int from_tty)
 
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
-  if (arg == (char *) NULL)
+  if (arg == NULL)
     parse_scrolling_args (arg, &win_to_scroll, (int *) NULL);
   else
     parse_scrolling_args (arg, &win_to_scroll, &num_to_scroll);
@@ -1000,7 +999,7 @@ tui_scroll_backward_command (const char *arg, int from_tty)
 
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
-  if (arg == (char *) NULL)
+  if (arg == NULL)
     parse_scrolling_args (arg, &win_to_scroll, (int *) NULL);
   else
     parse_scrolling_args (arg, &win_to_scroll, &num_to_scroll);
@@ -1038,9 +1037,9 @@ tui_scroll_right_command (const char *arg, int from_tty)
 static void
 tui_set_focus (const char *arg, int from_tty)
 {
-  if (arg != (char *) NULL)
+  if (arg != NULL)
     {
-      char *buf_ptr = (char *) xstrdup (arg);
+      char *buf_ptr = xstrdup (arg);
       int i;
       struct tui_win_info *win_info = NULL;
 
@@ -1121,7 +1120,7 @@ tui_set_tab_width_command (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
-  if (arg != (char *) NULL)
+  if (arg != NULL)
     {
       int ts;
 
@@ -1160,7 +1159,7 @@ tui_set_win_height (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
-  if (arg != (char *) NULL)
+  if (arg != NULL)
     {
       std::string copy = arg;
       char *buf = &copy[0];
@@ -1171,7 +1170,7 @@ tui_set_win_height (const char *arg, int from_tty)
 
       wname = buf_ptr;
       buf_ptr = strchr (buf_ptr, ' ');
-      if (buf_ptr != (char *) NULL)
+      if (buf_ptr != NULL)
 	{
 	  *buf_ptr = (char) 0;
 
@@ -1444,9 +1443,8 @@ make_invisible_and_set_new_height (struct tui_win_info *win_info,
       /* Delete all data item windows.  */
       for (i = 0; i < win_info->generic.content_size; i++)
 	{
-	  gen_win_info = (struct tui_gen_win_info *)
+	  gen_win_info
-	    &((struct tui_win_element *)
+	    = &win_info->generic.content[i]->which_element.data_window;
-	      win_info->generic.content[i])->which_element.data_window;
 	  tui_delete_win (gen_win_info->handle);
 	  gen_win_info->handle = NULL;
 	}
@@ -1653,7 +1651,7 @@ parse_scrolling_args (const char *arg,
 
   /* First set up the default window to scroll, in case there is no
      window name arg.  */
-  if (arg != (char *) NULL)
+  if (arg != NULL)
     {
       char *buf_ptr;
 
@@ -1666,7 +1664,7 @@ parse_scrolling_args (const char *arg,
 
 	  num_str = buf_ptr;
 	  buf_ptr = strchr (buf_ptr, ' ');
-	  if (buf_ptr != (char *) NULL)
+	  if (buf_ptr != NULL)
 	    {
 	      *buf_ptr = (char) 0;
 	      if (num_to_scroll)
@@ -1678,7 +1676,7 @@ parse_scrolling_args (const char *arg,
 	}
 
       /* Process the window name if one is specified.  */
-      if (buf_ptr != (char *) NULL)
+      if (buf_ptr != NULL)
 	{
 	  const char *wname;
 

gdb/tui/tui-windata.c

@@ -53,8 +53,8 @@ tui_first_data_item_displayed (void)
     {
       struct tui_gen_win_info *data_item_win;
 
-      data_item_win = &((tui_win_content)
+      data_item_win
-			TUI_DATA_WIN->generic.content)[i]->which_element.data_window;
+	= &TUI_DATA_WIN->generic.content[i]->which_element.data_window;
       if (data_item_win->handle != (WINDOW *) NULL 
 	  && data_item_win->is_visible)
 	element_no = i;
@@ -91,8 +91,8 @@ tui_delete_data_content_windows (void)
 
   for (i = 0; (i < TUI_DATA_WIN->generic.content_size); i++)
     {
-      data_item_win_ptr = &((tui_win_content)
+      data_item_win_ptr
-			    TUI_DATA_WIN->generic.content)[i]->which_element.data_window;
+	= &TUI_DATA_WIN->generic.content[i]->which_element.data_window;
       tui_delete_win (data_item_win_ptr->handle);
       data_item_win_ptr->handle = NULL;
       data_item_win_ptr->is_visible = FALSE;
@@ -105,7 +105,7 @@ tui_erase_data_content (const char *prompt)
 {
   werase (TUI_DATA_WIN->generic.handle);
   tui_check_and_display_highlight_if_needed (TUI_DATA_WIN);
-  if (prompt != (char *) NULL)
+  if (prompt != NULL)
     {
       int half_width = (TUI_DATA_WIN->generic.width - 2) / 2;
       int x_pos;
@@ -132,7 +132,7 @@ tui_display_all_data (void)
     tui_erase_data_content (NO_DATA_STRING);
   else
     {
-      tui_erase_data_content ((char *) NULL);
+      tui_erase_data_content (NULL);
       tui_delete_data_content_windows ();
       tui_check_and_display_highlight_if_needed (TUI_DATA_WIN);
       tui_display_registers_from (0);
@@ -201,7 +201,7 @@ tui_display_data_from (int element_no, int reuse_windows)
 
   if (first_line >= 0)
     {
-      tui_erase_data_content ((char *) NULL);
+      tui_erase_data_content (NULL);
       if (!reuse_windows)
 	tui_delete_data_content_windows ();
       tui_display_data_from_line (first_line);
@@ -213,7 +213,7 @@ tui_display_data_from (int element_no, int reuse_windows)
 void
 tui_refresh_data_win (void)
 {
-  tui_erase_data_content ((char *) NULL);
+  tui_erase_data_content (NULL);
   if (TUI_DATA_WIN->generic.content_size > 0)
     {
       int first_element = tui_first_data_item_displayed ();
@@ -284,7 +284,7 @@ tui_vertical_data_scroll (enum tui_scroll_direction scroll_direction,
 	first_line += num_to_scroll;
       else
 	first_line -= num_to_scroll;
-      tui_erase_data_content ((char *) NULL);
+      tui_erase_data_content (NULL);
       tui_delete_data_content_windows ();
       tui_display_data_from_line (first_line);
     }

gdb/tui/tui-wingeneral.c

@@ -43,8 +43,7 @@ tui_refresh_win (struct tui_gen_win_info *win_info)
 	{
 	  struct tui_gen_win_info *data_item_win_ptr;
 
-	  data_item_win_ptr = &((tui_win_content)
+	  data_item_win_ptr = &win_info->content[i]->which_element.data_window;
-				win_info->content)[i]->which_element.data_window;
 	  if (data_item_win_ptr != NULL
 	      && data_item_win_ptr->handle != (WINDOW *) NULL)
 	    wrefresh (data_item_win_ptr->handle);
@@ -101,7 +100,7 @@ box_win (struct tui_gen_win_info *win_info,
       box (win, tui_border_vline, tui_border_hline);
 #endif
       if (win_info->title)
-        mvwaddstr (win, 0, 3, (char *) win_info->title);
+        mvwaddstr (win, 0, 3, win_info->title);
       wattroff (win, attrs);
     }
 }

gdb/tui/tui-winsource.c

@@ -279,7 +279,7 @@ tui_show_source_line (struct tui_win_info *win_info, int lineno)
     wattron (win_info->generic.handle, A_STANDOUT);
 
   mvwaddstr (win_info->generic.handle, lineno, 1,
-             (char *) line->which_element.source.line);
+	     line->which_element.source.line);
   if (line->which_element.source.is_exec_point)
     wattroff (win_info->generic.handle, A_STANDOUT);
 
@@ -364,7 +364,7 @@ tui_set_is_exec_point_at (struct tui_line_or_address l,
 {
   int changed = 0;
   int i;
-  tui_win_content content = (tui_win_content) win_info->generic.content;
+  tui_win_content content = win_info->generic.content;
 
   i = 0;
   while (i < win_info->generic.content_size)
@@ -651,7 +651,7 @@ tui_line_is_displayed (int line,
 	= win_info->generic.content[i]
 	    ->which_element.source.line_or_addr.loa == LOA_LINE
 	  && win_info->generic.content[i]
-	       ->which_element.source.line_or_addr.u.line_no == (int) line;
+	       ->which_element.source.line_or_addr.u.line_no == line;
       i++;
     }
 

gdb/tui/tui.c

@@ -562,7 +562,7 @@ void
 strcat_to_buf (char *buf, int buflen, 
 	       const char *item_to_add)
 {
-  if (item_to_add != (char *) NULL && buf != (char *) NULL)
+  if (item_to_add != NULL && buf != NULL)
     {
       if ((strlen (buf) + strlen (item_to_add)) <= buflen)
 	strcat (buf, item_to_add);