[PATCH 17/66] Remove struct tui_data_info

[Tom Tromey <tom@tromey.com>]

Like the previous two patches, this removes struct tui_data_info in
favor of inlining its contents into tui_data_window.  This was the
last member of the tui_win_info detail union, so that is removed.

gdb/ChangeLog
2019-06-23  Tom Tromey  <tom@tromey.com>

	* tui/tui-windata.c (tui_display_all_data)
	(tui_display_data_from_line, tui_display_data_from)
	(tui_check_data_values, tui_data_window::do_scroll_vertical):
	Update.
	* tui/tui-regs.c (tui_last_regs_line_no)
	(tui_line_from_reg_element_no, tui_first_reg_element_no_inline)
	(tui_show_registers, tui_show_register_group)
	(tui_display_registers_from, tui_display_reg_element_at_line)
	(tui_display_registers_from_line, tui_check_register_values)
	(tui_reg_next, tui_reg_prev): Update.
	* tui/tui-layout.c (tui_set_layout, show_data): Update.
	* tui/tui-data.h (struct tui_data_info): Remove.  Move contents to
	tui_data_window.
	(struct tui_win_info) <detail>: Remove.  Add new fields from
	tui_data_info.
	(TUI_DATA_WIN): Add cast.
	* tui/tui-data.c (tui_data_window::clear_detail, tui_data_window)
	(~tui_data_window): Simplify.
---
 gdb/ChangeLog         |  21 ++++++++
 gdb/tui/tui-data.c    |  44 ++++++++--------
 gdb/tui/tui-data.h    |  29 ++++-------
 gdb/tui/tui-layout.c  |   8 +--
 gdb/tui/tui-regs.c    | 115 +++++++++++++++++++-----------------------
 gdb/tui/tui-windata.c |  17 +++----
 6 files changed, 112 insertions(+), 122 deletions(-)

diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index ef9c9998930..37aee67df0b 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -190,12 +190,12 @@ tui_cmd_window::clear_detail ()
 void
 tui_data_window::clear_detail ()
 {
-  detail.data_display_info.data_content = NULL;
-  detail.data_display_info.data_content_count = 0;
-  detail.data_display_info.regs_content = NULL;
-  detail.data_display_info.regs_content_count = 0;
-  detail.data_display_info.regs_column_count = 1;
-  detail.data_display_info.display_regs = FALSE;
+  data_content = NULL;
+  data_content_count = 0;
+  regs_content = NULL;
+  regs_content_count = 0;
+  regs_column_count = 1;
+  display_regs = FALSE;
 }
 
 /* Accessor for the source execution info ptr.  */
@@ -498,13 +498,13 @@ tui_source_window_base::tui_source_window_base (enum tui_win_type type)
 tui_data_window::tui_data_window ()
   : tui_win_info (DATA_WIN)
 {
-  detail.data_display_info.data_content = (tui_win_content) NULL;
-  detail.data_display_info.data_content_count = 0;
-  detail.data_display_info.regs_content = (tui_win_content) NULL;
-  detail.data_display_info.regs_content_count = 0;
-  detail.data_display_info.regs_column_count = 1;
-  detail.data_display_info.display_regs = FALSE;
-  detail.data_display_info.current_group = 0;
+  data_content = NULL;
+  data_content_count = 0;
+  regs_content = NULL;
+  regs_content_count = 0;
+  regs_column_count = 1;
+  display_regs = FALSE;
+  current_group = 0;
 }
 
 tui_cmd_window::tui_cmd_window ()
@@ -614,16 +614,14 @@ tui_data_window::~tui_data_window ()
 {
   if (generic.content != NULL)
     {
-      tui_free_data_content (detail.data_display_info.regs_content,
-			     detail.data_display_info.regs_content_count);
-      detail.data_display_info.regs_content = NULL;
-      detail.data_display_info.regs_content_count = 0;
-      tui_free_data_content (detail.data_display_info.data_content,
-			     detail.data_display_info.data_content_count);
-      detail.data_display_info.data_content = NULL;
-      detail.data_display_info.data_content_count = 0;
-      detail.data_display_info.regs_column_count = 1;
-      detail.data_display_info.display_regs = FALSE;
+      tui_free_data_content (regs_content, regs_content_count);
+      regs_content = NULL;
+      regs_content_count = 0;
+      tui_free_data_content (data_content, data_content_count);
+      data_content = NULL;
+      data_content_count = 0;
+      regs_column_count = 1;
+      display_regs = FALSE;
       generic.content = NULL;
       generic.content_size = 0;
     }
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index 4ca3a89b74e..6e50601dd9a 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -224,20 +224,6 @@ struct tui_win_element
   union tui_which_element which_element;
 };
 
-/* This struct defines the specific information about a data display
-   window.  */
-struct tui_data_info
-{
-  tui_win_content data_content;	/* Start of data display content.  */
-  int data_content_count;
-  tui_win_content regs_content;	/* Start of regs display content.  */
-  int regs_content_count;
-  int regs_column_count;
-  int display_regs;		/* Should regs be displayed at all?  */
-  struct reggroup *current_group;
-};
-
-
 /* This defines information about each logical window.  */
 struct tui_win_info
 {
@@ -278,11 +264,6 @@ public:
   void right_scroll (int num_to_scroll);
 
   struct tui_gen_win_info generic;	/* General window information.  */
-  union
-  {
-    struct tui_data_info data_display_info;
-  }
-  detail;
 
   /* Can this window ever be highlighted?  */
   int can_highlight = 0;
@@ -371,6 +352,14 @@ struct tui_data_window : public tui_win_info
 
   void clear_detail () override;
 
+  tui_win_content data_content;	/* Start of data display content.  */
+  int data_content_count;
+  tui_win_content regs_content;	/* Start of regs display content.  */
+  int regs_content_count;
+  int regs_column_count;
+  int display_regs;		/* Should regs be displayed at all?  */
+  struct reggroup *current_group;
+
 protected:
 
   void do_scroll_vertical (enum tui_scroll_direction,
@@ -414,7 +403,7 @@ extern struct tui_win_info *tui_win_list[MAX_MAJOR_WINDOWS];
 
 #define TUI_SRC_WIN     ((tui_source_window_base *) tui_win_list[SRC_WIN])
 #define TUI_DISASM_WIN	((tui_source_window_base *) tui_win_list[DISASSEM_WIN])
-#define TUI_DATA_WIN    tui_win_list[DATA_WIN]
+#define TUI_DATA_WIN    ((tui_data_window *) tui_win_list[DATA_WIN])
 #define TUI_CMD_WIN     ((tui_cmd_window *) tui_win_list[CMD_WIN])
 
 /* Data Manipulation Functions.  */
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 95b89f8583a..72ec924f72c 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -227,11 +227,7 @@ tui_set_layout (enum tui_layout_type layout_type)
 	  tui_update_source_windows_with_addr (gdbarch, addr);
 
 	  if (regs_populate)
-	    {
-	      struct reggroup *group =
-		TUI_DATA_WIN->detail.data_display_info.current_group;
-	      tui_show_registers (group);
-	    }
+	    tui_show_registers (TUI_DATA_WIN->current_group);
 	}
     }
   else
@@ -726,7 +722,7 @@ show_data (enum tui_layout_type new_layout)
   src_height = total_height - data_height;
   tui_make_all_invisible ();
   tui_make_invisible (locator);
-  make_data_window (&TUI_DATA_WIN, data_height, 0);
+  make_data_window (&tui_win_list[DATA_WIN], data_height, 0);
   TUI_DATA_WIN->can_highlight = TRUE;
   if (new_layout == SRC_DATA_COMMAND)
     win_type = SRC_WIN;
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index b3456113369..451bcdfb364 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -72,12 +72,11 @@ tui_last_regs_line_no (void)
 {
   int num_lines = (-1);
 
-  if (TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
+  if (TUI_DATA_WIN->regs_content_count > 0)
     {
-      num_lines = (TUI_DATA_WIN->detail.data_display_info.regs_content_count /
-		  TUI_DATA_WIN->detail.data_display_info.regs_column_count);
-      if (TUI_DATA_WIN->detail.data_display_info.regs_content_count %
-	  TUI_DATA_WIN->detail.data_display_info.regs_column_count)
+      num_lines = (TUI_DATA_WIN->regs_content_count
+		   / TUI_DATA_WIN->regs_column_count);
+      if (TUI_DATA_WIN->regs_content_count % TUI_DATA_WIN->regs_column_count)
 	num_lines++;
     }
   return num_lines;
@@ -90,15 +89,14 @@ tui_last_regs_line_no (void)
 int
 tui_line_from_reg_element_no (int element_no)
 {
-  if (element_no < TUI_DATA_WIN->detail.data_display_info.regs_content_count)
+  if (element_no < TUI_DATA_WIN->regs_content_count)
     {
       int i, line = (-1);
 
       i = 1;
       while (line == (-1))
 	{
-	  if (element_no <
-	      (TUI_DATA_WIN->detail.data_display_info.regs_column_count * i))
+	  if (element_no < TUI_DATA_WIN->regs_column_count * i)
 	    line = i - 1;
 	  else
 	    i++;
@@ -116,11 +114,10 @@ tui_line_from_reg_element_no (int element_no)
 int
 tui_first_reg_element_no_inline (int line_no)
 {
-  if ((line_no * TUI_DATA_WIN->detail.data_display_info.regs_column_count)
-      <= TUI_DATA_WIN->detail.data_display_info.regs_content_count)
-    return ((line_no + 1) *
-	    TUI_DATA_WIN->detail.data_display_info.regs_column_count) -
-      TUI_DATA_WIN->detail.data_display_info.regs_column_count;
+  if ((line_no * TUI_DATA_WIN->regs_column_count)
+      <= TUI_DATA_WIN->regs_content_count)
+    return (((line_no + 1) * TUI_DATA_WIN->regs_column_count) 
+	    - TUI_DATA_WIN->regs_column_count);
   else
     return (-1);
 }
@@ -132,7 +129,6 @@ void
 tui_show_registers (struct reggroup *group)
 {
   enum tui_status ret = TUI_FAILURE;
-  struct tui_data_info *display_info;
 
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -142,22 +138,21 @@ tui_show_registers (struct reggroup *group)
   if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->generic.is_visible)
     tui_set_layout_by_name (DATA_NAME);
 
-  display_info = &TUI_DATA_WIN->detail.data_display_info;
   if (group == 0)
     group = general_reggroup;
 
   /* Say that registers should be displayed, even if there is a
      problem.  */
-  display_info->display_regs = TRUE;
+  TUI_DATA_WIN->display_regs = TRUE;
 
   if (target_has_registers && target_has_stack && target_has_memory)
     {
       ret = tui_show_register_group (group, get_selected_frame (NULL),
-                                     group == display_info->current_group);
+                                     group == TUI_DATA_WIN->current_group);
     }
   if (ret == TUI_FAILURE)
     {
-      display_info->current_group = 0;
+      TUI_DATA_WIN->current_group = 0;
       tui_erase_data_content (NO_REGS_STRING);
     }
   else
@@ -165,17 +160,17 @@ tui_show_registers (struct reggroup *group)
       int i;
 
       /* Clear all notation of changed values.  */
-      for (i = 0; i < display_info->regs_content_count; i++)
+      for (i = 0; i < TUI_DATA_WIN->regs_content_count; i++)
 	{
 	  struct tui_gen_win_info *data_item_win;
           struct tui_win_element *win;
 
-	  data_item_win = &display_info->regs_content[i]
+	  data_item_win = &TUI_DATA_WIN->regs_content[i]
             ->which_element.data_window;
           win = data_item_win->content[0];
           win->which_element.data.highlight = FALSE;
 	}
-      display_info->current_group = group;
+      TUI_DATA_WIN->current_group = group;
       tui_display_all_data ();
     }
 }
@@ -196,7 +191,6 @@ tui_show_register_group (struct reggroup *group,
   int allocated_here = FALSE;
   int regnum, pos;
   char title[80];
-  struct tui_data_info *display_info = &TUI_DATA_WIN->detail.data_display_info;
 
   /* Make a new title showing which group we display.  */
   snprintf (title, sizeof (title) - 1, "Register group: %s",
@@ -223,29 +217,29 @@ tui_show_register_group (struct reggroup *group,
       nr_regs++;
     }
 
-  if (display_info->regs_content_count > 0 && !refresh_values_only)
+  if (TUI_DATA_WIN->regs_content_count > 0 && !refresh_values_only)
     {
-      tui_free_data_content (display_info->regs_content,
-                             display_info->regs_content_count);
-      display_info->regs_content_count = 0;
+      tui_free_data_content (TUI_DATA_WIN->regs_content,
+                             TUI_DATA_WIN->regs_content_count);
+      TUI_DATA_WIN->regs_content_count = 0;
     }
 
-  if (display_info->regs_content_count <= 0)
+  if (TUI_DATA_WIN->regs_content_count <= 0)
     {
-      display_info->regs_content = tui_alloc_content (nr_regs, DATA_WIN);
+      TUI_DATA_WIN->regs_content = tui_alloc_content (nr_regs, DATA_WIN);
       allocated_here = TRUE;
       refresh_values_only = FALSE;
     }
 
-  if (display_info->regs_content != NULL)
+  if (TUI_DATA_WIN->regs_content != NULL)
     {
       if (!refresh_values_only || allocated_here)
 	{
 	  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 = TUI_DATA_WIN->generic.content;
-	  display_info->regs_content_count = nr_regs;
+	  TUI_DATA_WIN->regs_content = TUI_DATA_WIN->generic.content;
+	  TUI_DATA_WIN->regs_content_count = nr_regs;
 	}
 
       /* Now set the register names and values.  */
@@ -267,7 +261,7 @@ tui_show_register_group (struct reggroup *group,
 	    continue;
 
 	  data_item_win =
-            &display_info->regs_content[pos]->which_element.data_window;
+            &TUI_DATA_WIN->regs_content[pos]->which_element.data_window;
           data = &data_item_win->content[0]->which_element.data;
           if (data)
             {
@@ -283,7 +277,7 @@ tui_show_register_group (struct reggroup *group,
 	}
 
       TUI_DATA_WIN->generic.content_size =
-	display_info->regs_content_count + display_info->data_content_count;
+	TUI_DATA_WIN->regs_content_count + TUI_DATA_WIN->data_content_count;
       ret = TUI_SUCCESS;
     }
 
@@ -297,16 +291,14 @@ tui_show_register_group (struct reggroup *group,
 void
 tui_display_registers_from (int start_element_no)
 {
-  struct tui_data_info *display_info = &TUI_DATA_WIN->detail.data_display_info;
-
-  if (display_info->regs_content != NULL
-      && display_info->regs_content_count > 0)
+  if (TUI_DATA_WIN->regs_content != NULL
+      && TUI_DATA_WIN->regs_content_count > 0)
     {
       int i = start_element_no;
       int j, item_win_width, cur_y;
 
       int max_len = 0;
-      for (i = 0; i < display_info->regs_content_count; i++)
+      for (i = 0; i < TUI_DATA_WIN->regs_content_count; i++)
         {
           struct tui_data_element *data;
           struct tui_gen_win_info *data_item_win;
@@ -314,7 +306,7 @@ tui_display_registers_from (int start_element_no)
           int len;
 
           data_item_win
-	    = &display_info->regs_content[i]->which_element.data_window;
+	    = &TUI_DATA_WIN->regs_content[i]->which_element.data_window;
           data = &data_item_win->content[0]->which_element.data;
           len = 0;
           p = data->content;
@@ -333,29 +325,29 @@ tui_display_registers_from (int start_element_no)
       item_win_width = max_len + 1;
       i = start_element_no;
 
-      display_info->regs_column_count =
+      TUI_DATA_WIN->regs_column_count =
         (TUI_DATA_WIN->generic.width - 2) / item_win_width;
-      if (display_info->regs_column_count == 0)
-        display_info->regs_column_count = 1;
+      if (TUI_DATA_WIN->regs_column_count == 0)
+        TUI_DATA_WIN->regs_column_count = 1;
       item_win_width =
-        (TUI_DATA_WIN->generic.width - 2) / display_info->regs_column_count;
+        (TUI_DATA_WIN->generic.width - 2) / TUI_DATA_WIN->regs_column_count;
 
       /* Now create each data "sub" window, and write the display into
 	 it.  */
       cur_y = 1;
-      while (i < display_info->regs_content_count 
+      while (i < TUI_DATA_WIN->regs_content_count 
 	     && cur_y <= TUI_DATA_WIN->generic.viewport_height)
 	{
 	  for (j = 0;
-	       j < display_info->regs_column_count
-		 && i < display_info->regs_content_count;
+	       j < TUI_DATA_WIN->regs_column_count
+		 && i < TUI_DATA_WIN->regs_content_count;
 	       j++)
 	    {
 	      struct tui_gen_win_info *data_item_win;
 	      struct tui_data_element *data_element_ptr;
 
 	      /* Create the window if necessary.  */
-	      data_item_win = &display_info->regs_content[i]
+	      data_item_win = &TUI_DATA_WIN->regs_content[i]
                 ->which_element.data_window;
 	      data_element_ptr = &data_item_win->content[0]->which_element.data;
               if (data_item_win->handle != NULL
@@ -398,8 +390,8 @@ static void
 tui_display_reg_element_at_line (int start_element_no,
 				 int start_line_no)
 {
-  if (TUI_DATA_WIN->detail.data_display_info.regs_content != NULL
-      && TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
+  if (TUI_DATA_WIN->regs_content != NULL
+      && TUI_DATA_WIN->regs_content_count > 0)
     {
       int element_no = start_element_no;
 
@@ -417,7 +409,7 @@ tui_display_reg_element_at_line (int start_element_no,
 	     the element_no causes us to scroll past the end of the
 	     registers, adjust what element to really start the
 	     display at.  */
-	  if (TUI_DATA_WIN->detail.data_display_info.data_content_count <= 0
+	  if (TUI_DATA_WIN->data_content_count <= 0
 	      && start_line_no > first_line_on_last_page)
 	    element_no
 	      = tui_first_reg_element_no_inline (first_line_on_last_page);
@@ -435,7 +427,7 @@ int
 tui_display_registers_from_line (int line_no, 
 				 int force_display)
 {
-  if (TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
+  if (TUI_DATA_WIN->regs_content_count > 0)
     {
       int line, element_no;
 
@@ -448,7 +440,7 @@ tui_display_registers_from_line (int line_no,
 	  if (line_no >= tui_last_regs_line_no ())
 	    {
 	      if ((line = tui_line_from_reg_element_no (
-		 TUI_DATA_WIN->detail.data_display_info.regs_content_count - 1)) < 0)
+		 TUI_DATA_WIN->regs_content_count - 1)) < 0)
 		line = 0;
 	    }
 	  else
@@ -459,7 +451,7 @@ tui_display_registers_from_line (int line_no,
 
       element_no = tui_first_reg_element_no_inline (line);
       if (element_no
-	  < TUI_DATA_WIN->detail.data_display_info.regs_content_count)
+	  < TUI_DATA_WIN->regs_content_count)
 	tui_display_reg_element_at_line (element_no, line);
       else
 	line = (-1);
@@ -480,23 +472,20 @@ tui_check_register_values (struct frame_info *frame)
   if (TUI_DATA_WIN != NULL
       && TUI_DATA_WIN->generic.is_visible)
     {
-      struct tui_data_info *display_info
-        = &TUI_DATA_WIN->detail.data_display_info;
-
-      if (display_info->regs_content_count <= 0 
-	  && display_info->display_regs)
-	tui_show_registers (display_info->current_group);
+      if (TUI_DATA_WIN->regs_content_count <= 0 
+	  && TUI_DATA_WIN->display_regs)
+	tui_show_registers (TUI_DATA_WIN->current_group);
       else
 	{
 	  int i;
 
-	  for (i = 0; (i < display_info->regs_content_count); i++)
+	  for (i = 0; (i < TUI_DATA_WIN->regs_content_count); i++)
 	    {
 	      struct tui_data_element *data;
 	      struct tui_gen_win_info *data_item_win_ptr;
 	      int was_hilighted;
 
-	      data_item_win_ptr = &display_info->regs_content[i]->
+	      data_item_win_ptr = &TUI_DATA_WIN->regs_content[i]->
                 which_element.data_window;
 	      data = &data_item_win_ptr->content[0]->which_element.data;
 	      was_hilighted = data->highlight;
@@ -560,7 +549,7 @@ tui_reg_next (struct gdbarch *gdbarch)
 
   if (TUI_DATA_WIN != NULL)
     {
-      group = TUI_DATA_WIN->detail.data_display_info.current_group;
+      group = TUI_DATA_WIN->current_group;
       group = reggroup_next (gdbarch, group);
       if (group == NULL)
         group = reggroup_next (gdbarch, NULL);
@@ -579,7 +568,7 @@ tui_reg_prev (struct gdbarch *gdbarch)
 
   if (TUI_DATA_WIN != NULL)
     {
-      group = TUI_DATA_WIN->detail.data_display_info.current_group;
+      group = TUI_DATA_WIN->current_group;
       group = reggroup_prev (gdbarch, group);
       if (group == NULL)
 	group = reggroup_prev (gdbarch, NULL);
diff --git a/gdb/tui/tui-windata.c b/gdb/tui/tui-windata.c
index 0c9661f1cbe..a0f20c309e1 100644
--- a/gdb/tui/tui-windata.c
+++ b/gdb/tui/tui-windata.c
@@ -121,8 +121,8 @@ tui_display_all_data (void)
       tui_display_registers_from (0);
 
       /* Then display the other data.  */
-      if (TUI_DATA_WIN->detail.data_display_info.data_content != NULL
-	  && TUI_DATA_WIN->detail.data_display_info.data_content_count > 0)
+      if (TUI_DATA_WIN->data_content != NULL
+	  && TUI_DATA_WIN->data_content_count > 0)
 	{
 	}
     }
@@ -143,7 +143,7 @@ tui_display_data_from_line (int line_no)
 
   /* There is no general data, force regs to display (if there are
      any).  */
-  if (TUI_DATA_WIN->detail.data_display_info.data_content_count <= 0)
+  if (TUI_DATA_WIN->data_content_count <= 0)
     tui_display_registers_from_line (_line_no, TRUE);
   else
     {
@@ -175,7 +175,7 @@ tui_display_data_from (int element_no, int reuse_windows)
 {
   int first_line = (-1);
 
-  if (element_no < TUI_DATA_WIN->detail.data_display_info.regs_content_count)
+  if (element_no < TUI_DATA_WIN->regs_content_count)
     first_line = tui_line_from_reg_element_no (element_no);
   else
     { /* Calculate the first_line from the element number.  */
@@ -218,16 +218,14 @@ tui_check_data_values (struct frame_info *frame)
     {
       int i;
 
-      for (i = 0; 
-	   TUI_DATA_WIN->detail.data_display_info.data_content_count; 
-	   i++)
+      for (i = 0; TUI_DATA_WIN->data_content_count; i++)
 	{
 #ifdef LATER
 	  tui_data_element_ptr data_element_ptr;
 	  struct tui_gen_win_info *data_item_win_ptr;
 	  Opaque new_value;
 
-	  data_item_ptr = &TUI_DATA_WIN->detail.data_display_info.
+	  data_item_ptr = &TUI_DATA_WIN->
 	    data_content[i]->which_element.data_window;
 	  data_element_ptr = &((tui_win_content)
 			       data_item_win_ptr->content)[0]->which_element.data;
@@ -252,8 +250,7 @@ tui_data_window::do_scroll_vertical
   int first_line = (-1);
 
   first_element_no = tui_first_data_item_displayed ();
-  if (first_element_no 
-      < detail.data_display_info.regs_content_count)
+  if (first_element_no < regs_content_count)
     first_line = tui_line_from_reg_element_no (first_element_no);
   else
     { /* Calculate the first line from the element number which is in
-- 
2.17.2