--- lbbs/include/screen.h	2025/05/28 01:04:23	1.8
+++ lbbs/include/screen.h	2025/06/08 09:25:24	1.14
@@ -17,16 +17,27 @@
 #ifndef _SCREEN_H_
 #define _SCREEN_H_
 
+#include <stddef.h>
+
 #define CTRL_SEQ_CLR_LINE "\033[K"
+#define MSG_EXT_MAX_LEN 200
 
-extern void moveto(int row, int col);
+struct display_ctx_t
+{
+	int reach_begin; // of data
+	int reach_end; // of data
+   long line_top; // current screen
+   long line_bottom; // current screen
+   char msg[MSG_EXT_MAX_LEN];
+};
+typedef struct display_ctx_t DISPLAY_CTX;
 
-extern void clrtoeol();
+typedef int (*display_data_key_handler)(int *p_key, DISPLAY_CTX *p_ctx);
 
+extern void moveto(int row, int col);
+extern void clrtoeol();
 extern void clrline(int line_begin, int line_end);
-
 extern void clrtobot(int line_begin);
-
 extern void clearscr();
 
 extern int press_any_key();
@@ -34,13 +45,16 @@ extern int press_any_key();
 extern void set_input_echo(int echo);
 
 extern int str_input(char *buffer, int buffer_length, int echo_mode);
-
 extern int get_data(int row, int col, char *prompt, char *buffer, int buffer_length, int echo_mode);
 
-extern int display_file_ex(const char *filename, int begin_line, int wait);
-
-extern int show_top(const char *str_left, const char *str_center);
+// eof_exit = 0 : Do not exit at EOF
+//            1 : Prompt for any key at EOF, then exit
+//            2 : Exit at EOF without prompt
+extern int display_data(const void *p_data, long display_line_total, const long *p_line_offsets, int eof_exit,
+                        display_data_key_handler key_handler, const char *help_filename);
+extern int display_file(const char *filename, int eof_exit);
 
+extern int show_top(const char *str_left, const char *str_center, const char *str_right);
 extern int show_bottom(const char *msg);
 
 extern int show_active_board();