--- lbbs/src/editor.c	2025/06/08 09:25:53	1.1
+++ lbbs/src/editor.c	2025/11/08 08:21:31	1.55
@@ -1,91 +1,142 @@
-/***************************************************************************
-						   editor.h  -  description
-							 -------------------
-	copyright            : (C) 2004-2025 by Leaflet
-	email                : leaflet@leafok.com
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 3 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * editor
+ *   - user interactive full-screen text editor
+ *
+ * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
+ */
 
-#include "editor.h"
 #include "bbs.h"
+#include "common.h"
+#include "editor.h"
 #include "io.h"
 #include "log.h"
-#include "common.h"
+#include "login.h"
+#include "memory_pool.h"
 #include "str_process.h"
 #include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
 #include <sys/param.h>
 
-#define _POSIX_C_SOURCE 200809L
-#include <string.h>
+enum _editor_constant_t
+{
+	EDITOR_MEM_POOL_LINE_PER_CHUNK = 1000,
+	EDITOR_MEM_POOL_CHUNK_LIMIT = (MAX_EDITOR_DATA_LINES / EDITOR_MEM_POOL_LINE_PER_CHUNK + 1),
+};
+
+static const char EDITOR_ESC_DISPLAY_STR[] = "\033[32m*\033[m";
+
+static MEMORY_POOL *p_mp_data_line;
+static MEMORY_POOL *p_mp_editor_data;
+
+int editor_memory_pool_init(void)
+{
+	if (p_mp_data_line != NULL || p_mp_editor_data != NULL)
+	{
+		log_error("Editor mem pool already initialized\n");
+		return -1;
+	}
+
+	p_mp_data_line = memory_pool_init(MAX_EDITOR_DATA_LINE_LENGTH, EDITOR_MEM_POOL_LINE_PER_CHUNK, EDITOR_MEM_POOL_CHUNK_LIMIT);
+	if (p_mp_data_line == NULL)
+	{
+		log_error("Memory pool init error\n");
+		return -2;
+	}
+
+	p_mp_editor_data = memory_pool_init(sizeof(EDITOR_DATA), 1, 1);
+	if (p_mp_editor_data == NULL)
+	{
+		log_error("Memory pool init error\n");
+		return -3;
+	}
+
+	return 0;
+}
+
+void editor_memory_pool_cleanup(void)
+{
+	if (p_mp_data_line != NULL)
+	{
+		memory_pool_cleanup(p_mp_data_line);
+		p_mp_data_line = NULL;
+	}
+
+	if (p_mp_editor_data != NULL)
+	{
+		memory_pool_cleanup(p_mp_editor_data);
+		p_mp_editor_data = NULL;
+	}
+}
 
 EDITOR_DATA *editor_data_load(const char *p_data)
 {
 	EDITOR_DATA *p_editor_data;
-	long line_offsets[MAX_EDITOR_DATA_LINES];
+	char *p_data_line = NULL;
+	long line_offsets[MAX_EDITOR_DATA_LINES + 1];
 	long current_data_line_length = 0;
-	long i, j;
+	long i;
 
 	if (p_data == NULL)
 	{
-		log_error("editor_data_load() error: NULL pointer\n");
+		log_error("NULL pointer error\n");
 		return NULL;
 	}
 
-	p_editor_data = malloc(sizeof(EDITOR_DATA));
+	p_editor_data = memory_pool_alloc(p_mp_editor_data);
 	if (p_editor_data == NULL)
 	{
-		log_error("malloc(EDITOR_DATA) error: OOM\n");
+		log_error("memory_pool_alloc() error\n");
 		return NULL;
 	}
 
-	p_editor_data->data_line_total = 0;
-	p_editor_data->display_line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_EDITOR_DATA_LINES);
+	p_editor_data->display_line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_EDITOR_DATA_LINES + 1,
+														 0, p_editor_data->display_line_widths);
 
 	for (i = 0; i < p_editor_data->display_line_total; i++)
 	{
 		p_editor_data->display_line_lengths[i] = line_offsets[i + 1] - line_offsets[i];
 
 		if (i == 0 ||
-			(current_data_line_length + p_editor_data->display_line_lengths[i] + 1) >= MAX_EDITOR_DATA_LINE_LENGTH ||
+			current_data_line_length + p_editor_data->display_line_lengths[i] + 1 > MAX_EDITOR_DATA_LINE_LENGTH ||
 			(p_editor_data->display_line_lengths[i - 1] > 0 && p_data[line_offsets[i - 1] + p_editor_data->display_line_lengths[i - 1] - 1] == '\n'))
 		{
 			// Allocate new data line
-			p_editor_data->p_data_lines[p_editor_data->data_line_total] = malloc(MAX_EDITOR_DATA_LINE_LENGTH);
-			if (p_editor_data->p_data_lines[p_editor_data->data_line_total] == NULL)
+			p_data_line = memory_pool_alloc(p_mp_data_line);
+			if (p_data_line == NULL)
 			{
-				log_error("malloc(MAX_EDITOR_DATA_LINE_LENGTH * %d) error: OOM\n", i);
+				log_error("memory_pool_alloc() error: i = %d\n", i);
 				// Cleanup
-				for (j = p_editor_data->data_line_total - 1; j >= 0; j--)
-				{
-					free(p_editor_data->p_data_lines[j]);
-				}
-				free(p_editor_data);
+				editor_data_cleanup(p_editor_data);
 				return NULL;
 			}
 
-			p_editor_data->p_display_lines[i] = p_editor_data->p_data_lines[p_editor_data->data_line_total];
-			(p_editor_data->data_line_total)++;
+			p_editor_data->p_display_lines[i] = p_data_line;
+			current_data_line_length = 0;
 		}
 		else
 		{
 			p_editor_data->p_display_lines[i] = p_editor_data->p_display_lines[i - 1] + p_editor_data->display_line_lengths[i - 1];
-			current_data_line_length = 0;
 		}
 
 		memcpy(p_editor_data->p_display_lines[i], p_data + line_offsets[i], (size_t)p_editor_data->display_line_lengths[i]);
-		p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i]] = '\0';
-
 		current_data_line_length += p_editor_data->display_line_lengths[i];
+
+		// Trim \n from last line
+		if (i + 1 == p_editor_data->display_line_total &&
+			p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n')
+		{
+			p_editor_data->display_line_lengths[i]--;
+			p_editor_data->display_line_widths[i]--;
+			current_data_line_length--;
+		}
+		p_data_line[current_data_line_length] = '\0';
 	}
 
+	memset(p_editor_data->p_display_lines + p_editor_data->display_line_total, 0, MAX_EDITOR_DATA_LINES - (size_t)p_editor_data->display_line_total);
+
 	return p_editor_data;
 }
 
@@ -96,7 +147,7 @@ long editor_data_save(const EDITOR_DATA
 
 	if (p_editor_data == NULL || p_data == NULL)
 	{
-		log_error("editor_data_save() error: NULL pointer\n");
+		log_error("NULL pointer error\n");
 		return -1;
 	}
 
@@ -120,6 +171,7 @@ long editor_data_save(const EDITOR_DATA
 
 void editor_data_cleanup(EDITOR_DATA *p_editor_data)
 {
+	char *p_data_line = NULL;
 	long i;
 
 	if (p_editor_data == NULL)
@@ -127,23 +179,461 @@ void editor_data_cleanup(EDITOR_DATA *p_
 		return;
 	}
 
-	for (i = p_editor_data->data_line_total - 1; i >= 0; i--)
+	for (i = 0; i < p_editor_data->display_line_total; i++)
+	{
+		if (p_data_line == NULL)
+		{
+			p_data_line = p_editor_data->p_display_lines[i];
+		}
+
+		if (p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n')
+		{
+			memory_pool_free(p_mp_data_line, p_data_line);
+			p_data_line = NULL;
+		}
+	}
+
+	if (p_data_line != NULL)
+	{
+		memory_pool_free(p_mp_data_line, p_data_line);
+	}
+
+	memory_pool_free(p_mp_editor_data, p_editor_data);
+}
+
+int editor_data_insert(EDITOR_DATA *p_editor_data, long *p_display_line, long *p_offset,
+					   const char *str, int str_len, long *p_last_updated_line)
+{
+	long display_line = *p_display_line;
+	long offset = *p_offset;
+	char *p_data_line = NULL;
+	long len_data_line;
+	long offset_data_line;
+	long last_display_line; // of data line
+	long line_offsets[MAX_EDITOR_DATA_LINE_LENGTH + 1];
+	int line_widths[MAX_EDITOR_DATA_LINE_LENGTH + 1];
+	long split_line_total;
+	long i;
+	int len;
+	int eol;
+	int display_len;
+
+	if (p_editor_data == NULL || p_last_updated_line == NULL)
+	{
+		log_error("NULL pointer error\n");
+		return -1;
+	}
+
+	// Get length of current data line
+	len_data_line = 0;
+	p_data_line = p_editor_data->p_display_lines[display_line];
+	for (i = display_line - 1; i >= 0; i--)
+	{
+		if (p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n') // reach end of prior data line
+		{
+			break;
+		}
+
+		len_data_line += p_editor_data->display_line_lengths[i];
+		p_data_line = p_editor_data->p_display_lines[i];
+	}
+	offset_data_line = len_data_line + offset;
+	last_display_line = p_editor_data->display_line_total - 1;
+	for (i = display_line; i < p_editor_data->display_line_total; i++)
+	{
+		len_data_line += p_editor_data->display_line_lengths[i];
+
+		if (p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n') // reach end of current data line
+		{
+			last_display_line = i;
+			break;
+		}
+	}
+
+	// Split current data line if over-length
+	if (len_data_line + str_len + 2 > MAX_EDITOR_DATA_LINE_LENGTH || str[0] == CR)
+	{
+		if (p_editor_data->display_line_total >= MAX_EDITOR_DATA_LINES)
+		{
+#ifdef _DEBUG
+			log_error("Split line error, display_line_total(%ld) reach limit(%d)\n",
+					  p_editor_data->display_line_total, MAX_EDITOR_DATA_LINES);
+#endif
+
+			return -2;
+		}
+
+		// Allocate new data line
+		p_data_line = memory_pool_alloc(p_mp_data_line);
+		if (p_data_line == NULL)
+		{
+			log_error("memory_pool_alloc() error\n");
+			return -2;
+		}
+
+		if (offset_data_line + str_len + 2 >= MAX_EDITOR_DATA_LINE_LENGTH || str[0] == CR)
+		{
+			if (str[0] == CR)
+			{
+				str_len = 0;
+			}
+
+			// Copy str to new data line
+			memcpy(p_data_line, str, (size_t)str_len);
+
+			// Copy rest part of current data line to new data line
+			memcpy(p_data_line + str_len,
+				   p_editor_data->p_display_lines[display_line] + offset,
+				   (size_t)(len_data_line - offset_data_line));
+
+			p_data_line[str_len + len_data_line - offset_data_line] = '\0';
+
+			// Add line ending to current display line (data line)
+			p_editor_data->p_display_lines[display_line][offset] = '\n';
+			p_editor_data->p_display_lines[display_line][offset + 1] = '\0';
+			p_editor_data->display_line_lengths[display_line] = offset + 1;
+
+			*p_display_line = display_line + 1;
+			*p_offset = str_len;
+		}
+		else
+		{
+			// Copy rest part of current data line to new data line
+			memcpy(p_data_line,
+				   p_editor_data->p_display_lines[display_line] + offset,
+				   (size_t)(len_data_line - offset_data_line));
+
+			p_data_line[len_data_line - offset_data_line] = '\0';
+
+			// Append str to current display line
+			memcpy(p_editor_data->p_display_lines[display_line] + offset, str, (size_t)str_len);
+
+			// Add line ending to current display line (data line)
+			p_editor_data->p_display_lines[display_line][offset + str_len] = '\n';
+			p_editor_data->p_display_lines[display_line][offset + str_len + 1] = '\0';
+			p_editor_data->display_line_lengths[display_line] = offset + str_len + 1;
+
+			*p_display_line = display_line;
+			*p_offset = offset + str_len;
+		}
+
+		// Update display width of current display line
+		len = split_line(p_editor_data->p_display_lines[display_line], SCREEN_COLS, &eol, &display_len, 0);
+		p_editor_data->display_line_widths[display_line] = display_len;
+
+		split_line_total = last_display_line - display_line + 3;
+
+		// Set start display_line for spliting new data line
+		display_line++;
+
+		*p_last_updated_line = p_editor_data->display_line_total;
+	}
+	else // insert str into current data line at offset_data_line
+	{
+		memmove(p_data_line + offset_data_line + str_len, p_data_line + offset_data_line, (size_t)(len_data_line - offset_data_line));
+		memcpy(p_data_line + offset_data_line, str, (size_t)str_len);
+		p_data_line[len_data_line + str_len] = '\0';
+
+		// Set p_data_line to head of current display line
+		p_data_line = p_editor_data->p_display_lines[display_line];
+		split_line_total = last_display_line - display_line + 3;
+
+		*p_display_line = display_line;
+		*p_offset = offset + str_len;
+	}
+
+	// Split current data line since beginning of current display line
+	split_line_total = split_data_lines(p_data_line, SCREEN_COLS, line_offsets, split_line_total, 0, line_widths);
+
+	for (i = 0; i < split_line_total; i++)
+	{
+		if (display_line + i > last_display_line)
+		{
+			// Insert blank display line after last_display_line
+			if (p_editor_data->display_line_total >= MAX_EDITOR_DATA_LINES)
+			{
+#ifdef _DEBUG
+				log_error("display_line_total over limit %d >= %d\n", p_editor_data->display_line_total, MAX_EDITOR_DATA_LINES);
+#endif
+
+				// Terminate prior display line with \n, to avoid error on cleanup
+				if (display_line + i - 1 >= 0 && p_editor_data->display_line_lengths[display_line + i - 1] > 0)
+				{
+					len = split_line(p_editor_data->p_display_lines[display_line + i - 1], SCREEN_COLS - 1, &eol, &display_len, 0);
+					p_editor_data->p_display_lines[display_line + i - 1][len] = '\n';
+					p_editor_data->p_display_lines[display_line + i - 1][len + 1] = '\0';
+					p_editor_data->display_line_lengths[display_line + i - 1] = len + 1;
+					p_editor_data->display_line_widths[display_line + i - 1] = display_len;
+				}
+				if (*p_offset >= p_editor_data->display_line_lengths[*p_display_line])
+				{
+					*p_offset = p_editor_data->display_line_lengths[*p_display_line] - 1;
+				}
+				break;
+			}
+
+			// for (j = p_editor_data->display_line_total; j > last_display_line + 1; j--)
+			// {
+			// 	p_editor_data->p_display_lines[j] = p_editor_data->p_display_lines[j - 1];
+			// 	p_editor_data->display_line_lengths[j] = p_editor_data->display_line_lengths[j - 1];
+			// 	p_editor_data->display_line_widths[j] = p_editor_data->display_line_widths[j - 1];
+			// }
+			memmove(p_editor_data->p_display_lines + last_display_line + 2,
+					p_editor_data->p_display_lines + last_display_line + 1,
+					(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+						sizeof(p_editor_data->p_display_lines[last_display_line + 1]));
+			memmove(p_editor_data->display_line_lengths + last_display_line + 2,
+					p_editor_data->display_line_lengths + last_display_line + 1,
+					(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+						sizeof(p_editor_data->display_line_lengths[last_display_line + 1]));
+			memmove(p_editor_data->display_line_widths + last_display_line + 2,
+					p_editor_data->display_line_widths + last_display_line + 1,
+					(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+						sizeof(p_editor_data->display_line_widths[last_display_line + 1]));
+
+			last_display_line++;
+			*p_last_updated_line = p_editor_data->display_line_total;
+			(p_editor_data->display_line_total)++;
+		}
+
+		p_editor_data->display_line_lengths[display_line + i] = line_offsets[i + 1] - line_offsets[i];
+		p_editor_data->display_line_widths[display_line + i] = line_widths[i];
+		p_editor_data->p_display_lines[display_line + i] =
+			(i == 0
+				 ? p_data_line
+				 : (p_editor_data->p_display_lines[display_line + i - 1] + p_editor_data->display_line_lengths[display_line + i - 1]));
+
+		if (p_editor_data->display_line_lengths[display_line + i] > 0 &&
+			p_editor_data->p_display_lines[display_line + i][p_editor_data->display_line_lengths[display_line + i] - 1] == '\n')
+		{
+			break;
+		}
+	}
+
+	*p_last_updated_line = MAX(display_line + MIN(i, split_line_total - 1), *p_last_updated_line);
+
+	if (*p_offset >= p_editor_data->display_line_lengths[*p_display_line])
+	{
+		if (*p_display_line + 1 < p_editor_data->display_line_total)
+		{
+			*p_offset -= p_editor_data->display_line_lengths[*p_display_line];
+			(*p_display_line)++;
+		}
+	}
+
+	// Prevent the last display line from being over-length
+	if (p_editor_data->display_line_total == MAX_EDITOR_DATA_LINES)
+	{
+		len = split_line(p_editor_data->p_display_lines[p_editor_data->display_line_total - 1], SCREEN_COLS - 1, &eol, &display_len, 0);
+		p_editor_data->p_display_lines[p_editor_data->display_line_total - 1][len] = '\0';
+		p_editor_data->display_line_lengths[p_editor_data->display_line_total - 1] = len;
+		p_editor_data->display_line_widths[p_editor_data->display_line_total - 1] = display_len;
+		if (*p_display_line + 1 >= p_editor_data->display_line_total)
+		{
+			*p_offset = MIN(*p_offset, len);
+			*p_display_line = p_editor_data->display_line_total - 1;
+		}
+	}
+
+	return 0;
+}
+
+int editor_data_delete(EDITOR_DATA *p_editor_data, long *p_display_line, long *p_offset,
+					   long *p_last_updated_line, int del_line)
+{
+	long display_line = *p_display_line;
+	long offset = *p_offset;
+	char *p_data_line = NULL;
+	long len_data_line;
+	long offset_data_line;
+	long last_display_line; // of data line
+	long line_offsets[MAX_EDITOR_DATA_LINE_LENGTH + 1];
+	int line_widths[MAX_EDITOR_DATA_LINE_LENGTH + 1];
+	long split_line_total;
+	long i, j;
+	int str_len = 0;
+	char c;
+
+	if (p_editor_data == NULL || p_last_updated_line == NULL)
+	{
+		log_error("NULL pointer error\n");
+		return -1;
+	}
+
+	// Get length of current data line
+	len_data_line = 0;
+	p_data_line = p_editor_data->p_display_lines[display_line];
+	for (i = display_line - 1; i >= 0; i--)
+	{
+		if (p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n') // reach end of prior data line
+		{
+			break;
+		}
+
+		len_data_line += p_editor_data->display_line_lengths[i];
+		p_data_line = p_editor_data->p_display_lines[i];
+	}
+	offset_data_line = len_data_line + offset;
+	last_display_line = p_editor_data->display_line_total - 1;
+	for (i = display_line; i < p_editor_data->display_line_total; i++)
+	{
+		len_data_line += p_editor_data->display_line_lengths[i];
+
+		if (p_editor_data->display_line_lengths[i] > 0 &&
+			p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n') // reach end of current data line
+		{
+			last_display_line = i;
+			break;
+		}
+	}
+
+	if (offset_data_line >= len_data_line) // end-of-line
+	{
+		return 0;
+	}
+
+	// Check str to be deleted
+	if (del_line)
+	{
+		str_len = (int)(p_editor_data->display_line_lengths[display_line] - offset);
+	}
+	else if (p_data_line[offset_data_line] > 0 && p_data_line[offset_data_line] < 127)
+	{
+		str_len = 1;
+	}
+	else if (p_data_line[offset_data_line] & 0x80) // head of multi-byte character
+	{
+		str_len = 1;
+		c = (p_data_line[offset_data_line] & 0x70) << 1;
+		while (c & 0x80)
+		{
+			str_len++;
+			c = (c & 0x7f) << 1;
+		}
+	}
+	else
 	{
-		free(p_editor_data->p_data_lines[i]);
+		log_error("Some strange character at display_line %ld, offset %ld: %d %d\n",
+				  display_line, offset, p_data_line[offset_data_line], p_data_line[offset_data_line + 1]);
+		str_len = 1;
 	}
 
-	free(p_editor_data);
+	// Current display line is (almost) empty
+	if (offset_data_line + str_len > len_data_line ||
+		(offset_data_line + str_len == len_data_line &&
+		 p_data_line[del_line ? len_data_line - 1 : offset_data_line] == '\n'))
+	{
+		if (display_line + 1 >= p_editor_data->display_line_total) // No additional display line (data line)
+		{
+			return 0;
+		}
+
+		len_data_line = 0; // Next data line
+		last_display_line = p_editor_data->display_line_total - 1;
+		for (i = display_line + 1; i < p_editor_data->display_line_total; i++)
+		{
+			len_data_line += p_editor_data->display_line_lengths[i];
+
+			if (p_editor_data->display_line_lengths[i] > 0 &&
+				p_editor_data->p_display_lines[i][p_editor_data->display_line_lengths[i] - 1] == '\n') // reach end of current data line
+			{
+				last_display_line = i;
+				break;
+			}
+		}
+
+		if (offset_data_line + len_data_line + 1 > MAX_EDITOR_DATA_LINE_LENGTH) // No enough buffer to merge current data line with next data line
+		{
+			return 0;
+		}
+
+		// Append next data line to current one
+		memcpy(p_data_line + offset_data_line, p_editor_data->p_display_lines[display_line + 1], (size_t)len_data_line);
+		p_data_line[offset_data_line + len_data_line] = '\0';
+
+		// Recycle next data line
+		memory_pool_free(p_mp_data_line, p_editor_data->p_display_lines[display_line + 1]);
+	}
+	else
+	{
+		memmove(p_data_line + offset_data_line, p_data_line + offset_data_line + str_len, (size_t)(len_data_line - offset_data_line - str_len));
+		p_data_line[len_data_line - str_len] = '\0';
+		len_data_line -= str_len;
+	}
+
+	// Set p_data_line to head of current display line
+	p_data_line = p_editor_data->p_display_lines[display_line];
+	split_line_total = last_display_line - display_line + 2;
+
+	// Split current data line since beginning of current display line
+	split_line_total = split_data_lines(p_data_line, SCREEN_COLS, line_offsets, split_line_total, 0, line_widths);
+
+	for (i = 0; i < split_line_total; i++)
+	{
+		p_editor_data->display_line_lengths[display_line + i] = line_offsets[i + 1] - line_offsets[i];
+		p_editor_data->display_line_widths[display_line + i] = line_widths[i];
+		p_editor_data->p_display_lines[display_line + i] =
+			(i == 0
+				 ? p_data_line
+				 : (p_editor_data->p_display_lines[display_line + i - 1] + p_editor_data->display_line_lengths[display_line + i - 1]));
+
+		if (p_editor_data->display_line_lengths[display_line + i] > 0 &&
+			p_editor_data->p_display_lines[display_line + i][p_editor_data->display_line_lengths[display_line + i] - 1] == '\n')
+		{
+			break;
+		}
+	}
+
+	*p_last_updated_line = display_line + MIN(i, split_line_total - 1);
+
+	if (*p_last_updated_line < last_display_line)
+	{
+		// Remove redundant display line after last_display_line
+		// for (j = last_display_line + 1; j < p_editor_data->display_line_total; j++)
+		// {
+		// 	p_editor_data->p_display_lines[j - (last_display_line - *p_last_updated_line)] = p_editor_data->p_display_lines[j];
+		// 	p_editor_data->display_line_lengths[j - (last_display_line - *p_last_updated_line)] = p_editor_data->display_line_lengths[j];
+		// 	p_editor_data->display_line_widths[j - (last_display_line - *p_last_updated_line)] = p_editor_data->display_line_widths[j];
+		// }
+		memmove(p_editor_data->p_display_lines + *p_last_updated_line + 1,
+				p_editor_data->p_display_lines + last_display_line + 1,
+				(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+					sizeof(p_editor_data->p_display_lines[last_display_line + 1]));
+		memmove(p_editor_data->display_line_lengths + *p_last_updated_line + 1,
+				p_editor_data->display_line_lengths + last_display_line + 1,
+				(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+					sizeof(p_editor_data->display_line_lengths[last_display_line + 1]));
+		memmove(p_editor_data->display_line_widths + *p_last_updated_line + 1,
+				p_editor_data->display_line_widths + last_display_line + 1,
+				(size_t)(p_editor_data->display_line_total - last_display_line - 1) *
+					sizeof(p_editor_data->display_line_widths[last_display_line + 1]));
+
+		j = p_editor_data->display_line_total;
+		(p_editor_data->display_line_total) -= (last_display_line - *p_last_updated_line);
+		*p_last_updated_line = MAX(j - 1, *p_last_updated_line);
+	}
+
+	// Return real offset
+	*p_offset = offset;
+
+	return str_len;
 }
 
-static int editor_display_key_handler(int *p_key, DISPLAY_CTX *p_ctx)
+static int editor_display_key_handler(int *p_key, EDITOR_CTX *p_ctx)
 {
 	switch (*p_key)
 	{
 	case 0: // Set msg
 		snprintf(p_ctx->msg, sizeof(p_ctx->msg),
-				 "| ����[\033[32m��\033[33m,\033[32mESC\033[33m] | "
-				 "�ƶ�[\033[32m��\033[33m/\033[32m��\033[33m/\033[32mPgUp\033[33m/\033[32mPgDn\033[33m] | "
-				 "����[\033[32mh\033[33m] |");
+				 "| 退出[\033[32mCtrl-W\033[33m] | [\033[32m%s\033[33m]",
+				 (UTF8_fixed_width ? "定宽" : "变宽"));
+		break;
+	case KEY_CSI:
+		*p_key = KEY_ESC;
 		break;
 	}
 
@@ -154,21 +644,32 @@ int editor_display(EDITOR_DATA *p_editor
 {
 	static int show_help = 1;
 	char buffer[MAX_EDITOR_DATA_LINE_LENGTH];
-	DISPLAY_CTX ctx;
+	EDITOR_CTX ctx;
 	int ch = 0;
-	int input_ok, screen_current_line;
-	const int screen_begin_line = 1;
-	int screen_end_line = SCREEN_ROWS - 1;
-	const int screen_line_total = screen_end_line - screen_begin_line + 1;
+	char input_str[5];
+	wchar_t wcs[2];
+	char c;
+	int str_len = 0;
+	int input_ok;
+	const int screen_begin_row = 1;
+	const int screen_row_total = SCREEN_ROWS - screen_begin_row;
+	int output_current_row = screen_begin_row;
+	int output_end_row = SCREEN_ROWS - 1;
 	long int line_current = 0;
 	long int len;
-	long int percentile;
 	int loop;
 	int eol, display_len;
 	long row_pos = 1, col_pos = 1;
+	long display_line_in, offset_in;
+	long display_line_out, offset_out;
+	int scroll_rows;
+	long last_updated_line = 0;
+	int key_insert = 1;
+	int i, j;
+	char *p_str;
+	int del_line;
 
-	screen_current_line = screen_begin_line;
-	clrline(screen_begin_line, SCREEN_ROWS);
+	clrline(output_current_row, SCREEN_ROWS);
 
 	// update msg_ext with extended key handler
 	if (editor_display_key_handler(&ch, &ctx) != 0)
@@ -176,35 +677,22 @@ int editor_display(EDITOR_DATA *p_editor
 		return ch;
 	}
 
-	loop = 1;
-	while (!SYS_server_exit && loop)
+	for (loop = 1; !SYS_server_exit && loop;)
 	{
-		if (line_current >= p_editor_data->display_line_total || screen_current_line > screen_end_line)
+		if (line_current >= p_editor_data->display_line_total || output_current_row > output_end_row)
 		{
-			ctx.reach_begin = (line_current < screen_current_line ? 1 : 0);
-
-			if (line_current - (screen_current_line - screen_begin_line) + screen_line_total < p_editor_data->display_line_total)
-			{
-				percentile = (line_current - (screen_current_line - screen_begin_line) + screen_line_total) * 100 / p_editor_data->display_line_total;
-				ctx.reach_end = 0;
-			}
-			else
-			{
-				percentile = 100;
-				ctx.reach_end = 1;
-			}
-
-			ctx.line_top = line_current - (screen_current_line - screen_begin_line) + 1;
-			ctx.line_bottom = MIN(line_current - (screen_current_line - screen_begin_line) + screen_line_total, p_editor_data->display_line_total);
+			ctx.line_cursor = line_current - output_current_row + row_pos + 1;
 
 			snprintf(buffer, sizeof(buffer),
-					 "\033[1;44;33m��\033[32m%ld\033[33m-\033[32m%ld\033[33m�� (\033[32m%ld%%\033[33m) %s",
-					 ctx.line_top,
-					 ctx.line_bottom,
-					 percentile,
+					 "\033[1;44;33m[\033[32m%ld\033[33m;\033[32m%ld\033[33m] "
+					 "第\033[32m%ld\033[33m/\033[32m%ld\033[33m行 [\033[32m%s\033[33m] "
+					 "%s",
+					 row_pos, col_pos,
+					 ctx.line_cursor, p_editor_data->display_line_total,
+					 key_insert ? "插入" : "替换",
 					 ctx.msg);
 
-			len = split_line(buffer, SCREEN_COLS, &eol, &display_len);
+			len = split_line(buffer, SCREEN_COLS, &eol, &display_len, 1);
 			for (; display_len < SCREEN_COLS; display_len++)
 			{
 				buffer[len++] = ' ';
@@ -218,11 +706,14 @@ int editor_display(EDITOR_DATA *p_editor
 			moveto((int)row_pos, (int)col_pos);
 			iflush();
 
-			input_ok = 0;
-			while (!SYS_server_exit && !input_ok)
+			str_len = 0;
+			ch = igetch_t(BBS_max_user_idle_time);
+			while (!SYS_server_exit)
 			{
-				ch = igetch_t(MAX_DELAY_TIME);
-				input_ok = 1;
+				if (ch != KEY_NULL && ch != KEY_TIMEOUT)
+				{
+					BBS_last_access_tm = time(NULL);
+				}
 
 				// extended key handler
 				if (editor_display_key_handler(&ch, &ctx) != 0)
@@ -230,150 +721,430 @@ int editor_display(EDITOR_DATA *p_editor
 					goto cleanup;
 				}
 
+				if (ch < 256 && (ch & 0x80)) // head of multi-byte character
+				{
+					str_len = 0;
+					c = (char)(ch & 0xf0);
+					while (c & 0x80)
+					{
+						input_str[str_len] = (char)(ch - 256);
+						str_len++;
+						c = (c & 0x7f) << 1;
+
+						if ((c & 0x80) == 0) // Input completed
+						{
+							break;
+						}
+
+						// Expect additional bytes of input
+						ch = igetch(100);						 // 0.1 second
+						if (ch == KEY_NULL || ch == KEY_TIMEOUT) // Ignore received bytes if no futher input
+						{
+#ifdef _DEBUG
+							log_error("Ignore %d bytes of incomplete UTF8 character\n", str_len);
+#endif
+							str_len = 0;
+							break;
+						}
+					}
+					input_str[str_len] = '\0';
+				}
+
+				if ((ch >= 32 && ch < 127) || str_len >= 2 || // Printable character or multi-byte character
+					ch == CR || ch == KEY_ESC)				  // Special character
+				{
+					// Refresh current action while user input
+					if (user_online_update(NULL) < 0)
+					{
+						log_error("user_online_update(NULL) error\n");
+					}
+
+					if (str_len == 0) // ch >= 32 && ch < 127
+					{
+						input_str[0] = (char)ch;
+						str_len = 1;
+					}
+
+					display_line_in = line_current - output_current_row + row_pos;
+					offset_in = split_line(p_editor_data->p_display_lines[display_line_in], (int)col_pos - 1, &eol, &display_len, 0);
+					display_line_out = display_line_in;
+					offset_out = offset_in;
+
+					last_updated_line = display_line_in;
+
+					if (!key_insert) // overwrite
+					{
+						if (editor_data_delete(p_editor_data, &display_line_out, &offset_out,
+											   &last_updated_line, 0) < 0)
+						{
+							log_error("editor_data_delete() error\n");
+						}
+					}
+
+					if (editor_data_insert(p_editor_data, &display_line_out, &offset_out,
+										   input_str, str_len, &last_updated_line) < 0)
+					{
+						log_error("editor_data_insert(str_len=%d) error\n", str_len);
+					}
+					else
+					{
+						output_end_row = MIN(SCREEN_ROWS - 1, output_current_row + (int)(last_updated_line - line_current));
+						line_current -= (output_current_row - row_pos);
+						output_current_row = (int)row_pos;
+
+						scroll_rows = MAX(0, (int)(display_line_out - display_line_in) - (output_end_row - output_current_row));
+
+						if (scroll_rows > 0)
+						{
+							moveto(SCREEN_ROWS, 0);
+							clrtoeol();
+							for (i = 0; i < scroll_rows; i++)
+							{
+								// prints("\033[S"); // Scroll up 1 line
+								prints("\n"); // Legacy Cterm only works with this line
+							}
+
+							output_current_row -= scroll_rows;
+							if (output_current_row < screen_begin_row)
+							{
+								line_current += (screen_begin_row - output_current_row);
+								output_current_row = screen_begin_row;
+							}
+							row_pos = output_end_row;
+						}
+						else // if (scroll_lines == 0)
+						{
+							row_pos += (display_line_out - display_line_in);
+						}
+
+						if (offset_out != offset_in)
+						{
+							if (display_line_out != display_line_in)
+							{
+								col_pos = 1;
+							}
+							if (offset_out > 0)
+							{
+								if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
+								{
+									log_error("mbstowcs() error\n");
+								}
+								col_pos += (str_len == 1 ? 1 : (UTF8_fixed_width ? 2 : wcwidth(wcs[0])));
+							}
+						}
+					}
+
+					if (display_line_out != display_line_in) // Output on line change
+					{
+						break;
+					}
+
+					ch = igetch(0);
+					if (ch == KEY_NULL || ch == KEY_TIMEOUT) // Output if no futher input
+					{
+						break;
+					}
+
+					str_len = 0;
+					continue;
+				}
+				else if (ch == KEY_DEL || ch == BACKSPACE || ch == Ctrl('K') || ch == Ctrl('Y')) // Del
+				{
+					// Refresh current action while user input
+					if (user_online_update(NULL) < 0)
+					{
+						log_error("user_online_update(NULL) error\n");
+					}
+
+					del_line = 0;
+
+					if (ch == BACKSPACE)
+					{
+						if (line_current - output_current_row + row_pos <= 0 && col_pos <= 1) // Forbidden
+						{
+							break; // force output prior operation result if any
+						}
+
+						offset_in = split_line(p_editor_data->p_display_lines[line_current - output_current_row + row_pos],
+											   (int)col_pos - 1, &eol, &display_len, 0);
+						col_pos = display_len;
+						if (col_pos < 1 && line_current - output_current_row + row_pos >= 0)
+						{
+							row_pos--;
+							col_pos = MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]);
+						}
+					}
+					else if (ch == Ctrl('K'))
+					{
+						del_line = 1;
+					}
+					else if (ch == Ctrl('Y'))
+					{
+						col_pos = 1;
+						del_line = 1;
+					}
+
+					display_line_in = line_current - output_current_row + row_pos;
+					offset_in = split_line(p_editor_data->p_display_lines[display_line_in], (int)col_pos - 1, &eol, &display_len, 0);
+					display_line_out = display_line_in;
+					offset_out = offset_in;
+
+					if ((str_len = editor_data_delete(p_editor_data, &display_line_out, &offset_out,
+													  &last_updated_line, del_line)) < 0)
+					{
+						log_error("editor_data_delete() error: %d\n", str_len);
+					}
+					else
+					{
+						col_pos = display_len + 1; // Set col_pos to accurate pos
+
+						output_end_row = MIN(SCREEN_ROWS - 1, output_current_row + (int)(last_updated_line - line_current));
+						line_current -= (output_current_row - row_pos);
+						output_current_row = (int)row_pos;
+
+						if (output_current_row < screen_begin_row) // row_pos <= 0
+						{
+							output_current_row = screen_begin_row;
+							row_pos = screen_begin_row;
+							output_end_row = SCREEN_ROWS - 1;
+						}
+
+						// Exceed end
+						if (line_current + (screen_row_total - output_current_row) >= p_editor_data->display_line_total &&
+							p_editor_data->display_line_total > screen_row_total)
+						{
+							scroll_rows = (int)((line_current - (output_current_row - screen_begin_row)) -
+												(p_editor_data->display_line_total - screen_row_total));
+
+							line_current = p_editor_data->display_line_total - screen_row_total;
+							row_pos += scroll_rows;
+							output_current_row = screen_begin_row;
+							output_end_row = SCREEN_ROWS - 1;
+						}
+
+						clrline(output_current_row, output_end_row);
+					}
+
+					if (display_line_out != display_line_in) // Output on line change
+					{
+						break;
+					}
+
+					ch = igetch(0);
+					if (ch == KEY_NULL || ch == KEY_TIMEOUT) // Output if no futher input
+					{
+						break;
+					}
+
+					str_len = 0;
+					continue;
+				}
+
+				input_ok = 1;
 				switch (ch)
 				{
 				case KEY_NULL:
+					log_error("KEY_NULL\n");
+					goto cleanup;
 				case KEY_TIMEOUT:
+					log_error("User input timeout\n");
 					goto cleanup;
-				case Ctrl('C'):
+				case Ctrl('W'):
+				case Ctrl('X'):
 					loop = 0;
 					break;
-				case Ctrl('H'):
+				case Ctrl('S'): // Start of line
+				case KEY_CTRL_LEFT:
 					col_pos = 1;
 					break;
-				case Ctrl('E'):
-					col_pos = MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]);
+				case Ctrl('E'): // End of line
+				case KEY_CTRL_RIGHT:
+					if (line_current - output_current_row + row_pos == p_editor_data->display_line_total - 1) // row_pos at end line
+					{
+						// last display line does NOT have \n in the end
+						col_pos = p_editor_data->display_line_widths[line_current - output_current_row + row_pos] + 1;
+						break;
+					}
+					col_pos = MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]);
+					break;
+				case Ctrl('T'): // Top of screen
+				case KEY_CTRL_UP:
+					row_pos = screen_begin_row;
+					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
+					break;
+				case Ctrl('B'): // Bottom of screen
+				case KEY_CTRL_DOWN:
+					if (p_editor_data->display_line_total < screen_row_total)
+					{
+						row_pos = p_editor_data->display_line_total;
+					}
+					else
+					{
+						row_pos = SCREEN_ROWS - 1;
+					}
+					if (line_current + (screen_row_total - (output_current_row - screen_begin_row)) >= p_editor_data->display_line_total) // Reach end
+					{
+						// last display line does NOT have \n in the end
+						col_pos = MIN(col_pos, p_editor_data->display_line_widths[line_current - output_current_row + row_pos] + 1);
+					}
+					else
+					{
+						col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
+					}
+					break;
+				case KEY_INS:
+					key_insert = !key_insert;
 					break;
 				case KEY_HOME:
 					row_pos = 1;
 					col_pos = 1;
-					if (line_current - screen_current_line < 0) // Reach begin
+					if (line_current - output_current_row < 0) // Reach begin
 					{
 						break;
 					}
 					line_current = 0;
-					screen_current_line = screen_begin_line;
-					screen_end_line = SCREEN_ROWS - 1;
-					clrline(screen_begin_line, SCREEN_ROWS);
+					output_current_row = screen_begin_row;
+					output_end_row = SCREEN_ROWS - 1;
+					clrline(output_current_row, SCREEN_ROWS);
 					break;
 				case KEY_END:
-					if (p_editor_data->display_line_total < screen_line_total)
+					if (p_editor_data->display_line_total < screen_row_total)
 					{
 						row_pos = p_editor_data->display_line_total;
-						col_pos = MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]);
+						col_pos = p_editor_data->display_line_widths[line_current - output_current_row + row_pos] + 1;
 						break;
 					}
-					line_current = p_editor_data->display_line_total - screen_line_total;
-					screen_current_line = screen_begin_line;
-					screen_end_line = SCREEN_ROWS - 1;
-					row_pos = screen_line_total;
-					col_pos = MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]);
-					clrline(screen_begin_line, SCREEN_ROWS);
+					line_current = p_editor_data->display_line_total - screen_row_total;
+					output_current_row = screen_begin_row;
+					output_end_row = SCREEN_ROWS - 1;
+					row_pos = SCREEN_ROWS - 1;
+					col_pos = p_editor_data->display_line_widths[line_current - output_current_row + row_pos] + 1;
+					clrline(output_current_row, SCREEN_ROWS);
 					break;
 				case KEY_LEFT:
-					if (col_pos > 1)
+					offset_in = split_line(p_editor_data->p_display_lines[line_current - output_current_row + row_pos],
+										   (int)col_pos - 1, &eol, &display_len, 0);
+					col_pos = display_len;
+					if (offset_in >= 1 && p_editor_data->p_display_lines[line_current - output_current_row + row_pos][offset_in - 1] < 0) // UTF8
+					{
+						split_line(p_editor_data->p_display_lines[line_current - output_current_row + row_pos],
+								   (int)col_pos - 1, &eol, &display_len, 0);
+						if (display_len == col_pos - 2)
+						{
+							col_pos--;
+						}
+					}
+					if (col_pos >= 1)
 					{
-						col_pos--;
 						break;
 					}
 					col_pos = SCREEN_COLS; // continue to KEY_UP
 				case KEY_UP:
-					if (row_pos > screen_begin_line)
+					if (row_pos > screen_begin_row)
 					{
 						row_pos--;
-						col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
+						col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
 						break;
 					}
-					if (line_current - screen_current_line < 0) // Reach begin
+					if (line_current - output_current_row < 0) // Reach begin
 					{
-						col_pos = MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]);
+						col_pos = 1;
 						break;
 					}
-					line_current -= screen_current_line;
-					screen_current_line = screen_begin_line;
+					line_current -= output_current_row;
+					output_current_row = screen_begin_row;
 					// screen_end_line = begin_line;
 					// prints("\033[T"); // Scroll down 1 line
-					screen_end_line = SCREEN_ROWS - 1; // Legacy Fterm only works with this line
-					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
-					break;
-				case CR:
-					break;
-				case KEY_SPACE:
+					output_end_row = SCREEN_ROWS - 1; // Legacy Fterm only works with this line
+					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
 					break;
 				case KEY_RIGHT:
-					if (col_pos < p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos])
+					offset_in = split_line(p_editor_data->p_display_lines[line_current - output_current_row + row_pos],
+										   (int)col_pos - 1, &eol, &display_len, 0);
+					col_pos = display_len + 2;
+					if (offset_in < p_editor_data->display_line_lengths[line_current - output_current_row + row_pos] &&
+						p_editor_data->p_display_lines[line_current - output_current_row + row_pos][offset_in] < 0) // UTF8
+					{
+						split_line(p_editor_data->p_display_lines[line_current - output_current_row + row_pos] + offset_in,
+								   1, &eol, &display_len, 0);
+						if (display_len == 0)
+						{
+							col_pos++;
+						}
+					}
+					if (col_pos <= p_editor_data->display_line_widths[line_current - output_current_row + row_pos])
 					{
-						col_pos++;
 						break;
 					}
 					col_pos = 1; // continue to KEY_DOWN
 				case KEY_DOWN:
-					if (row_pos < MIN(screen_line_total, p_editor_data->display_line_total))
+					if (row_pos < MIN(screen_row_total, p_editor_data->display_line_total))
 					{
 						row_pos++;
-						col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
+						col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
 						break;
 					}
-					if (line_current + (screen_line_total - (screen_current_line - screen_begin_line)) >= p_editor_data->display_line_total) // Reach end
+					if (line_current - output_current_row + row_pos == p_editor_data->display_line_total - 1) // row_pos at end line
 					{
-						col_pos = MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]);
+						// last display line does NOT have \n in the end
+						col_pos = p_editor_data->display_line_widths[line_current - output_current_row + row_pos] + 1;
 						break;
 					}
-					line_current += (screen_line_total - (screen_current_line - screen_begin_line));
-					screen_current_line = screen_line_total;
-					screen_end_line = SCREEN_ROWS - 1;
-					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
+					line_current += (screen_row_total - (output_current_row - screen_begin_row));
+					output_current_row = screen_row_total;
+					output_end_row = SCREEN_ROWS - 1;
+					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
 					moveto(SCREEN_ROWS, 0);
 					clrtoeol();
-					prints("\033[S"); // Scroll up 1 line
+					// prints("\033[S"); // Scroll up 1 line
+					prints("\n"); // Legacy Cterm only works with this line
 					break;
 				case KEY_PGUP:
-					if (line_current - screen_current_line < 0) // Reach begin
+					if (line_current - output_current_row < 0) // Reach begin
 					{
 						break;
 					}
-					line_current -= ((screen_line_total - 1) + (screen_current_line - screen_begin_line));
+					line_current -= ((screen_row_total - 1) + (output_current_row - screen_begin_row));
 					if (line_current < 0)
 					{
 						line_current = 0;
 					}
-					screen_current_line = screen_begin_line;
-					screen_end_line = SCREEN_ROWS - 1;
-					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
-					clrline(screen_begin_line, SCREEN_ROWS);
+					output_current_row = screen_begin_row;
+					output_end_row = SCREEN_ROWS - 1;
+					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
+					clrline(output_current_row, SCREEN_ROWS);
 					break;
 				case KEY_PGDN:
-					if (line_current + screen_line_total - (screen_current_line - screen_begin_line) >= p_editor_data->display_line_total) // Reach end
+					if (line_current + screen_row_total - (output_current_row - screen_begin_row) >= p_editor_data->display_line_total) // Reach end
 					{
 						break;
 					}
-					line_current += (screen_line_total - 1) - (screen_current_line - screen_begin_line);
-					if (line_current + screen_line_total > p_editor_data->display_line_total) // No enough lines to display
+					line_current += (screen_row_total - 1) - (output_current_row - screen_begin_row);
+					if (line_current + screen_row_total > p_editor_data->display_line_total) // No enough lines to display
 					{
-						line_current = p_editor_data->display_line_total - screen_line_total;
+						line_current = p_editor_data->display_line_total - screen_row_total;
 					}
-					screen_current_line = screen_begin_line;
-					screen_end_line = SCREEN_ROWS - 1;
-					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_lengths[line_current - screen_current_line + row_pos]));
-					clrline(screen_begin_line, SCREEN_ROWS);
-					break;
-				case KEY_ESC:
+					output_current_row = screen_begin_row;
+					output_end_row = SCREEN_ROWS - 1;
+					col_pos = MIN(col_pos, MAX(1, p_editor_data->display_line_widths[line_current - output_current_row + row_pos]));
+					clrline(output_current_row, SCREEN_ROWS);
 					break;
+				case Ctrl('Q'):
 				case KEY_F1:
-					if (!show_help) // Not reentrant
+					if (!show_help) // Not re-entrant
 					{
 						break;
 					}
 					// Display help information
 					show_help = 0;
-					display_file(DATA_READ_HELP, 1);
+					display_file(DATA_EDITOR_HELP, 1);
 					show_help = 1;
 				case KEY_F5:
 					// Refresh after display help information
-					line_current -= (screen_current_line - screen_begin_line);
-					screen_current_line = screen_begin_line;
-					screen_end_line = SCREEN_ROWS - 1;
-					clrline(screen_begin_line, SCREEN_ROWS);
+					line_current -= (output_current_row - screen_begin_row);
+					output_current_row = screen_begin_row;
+					output_end_row = SCREEN_ROWS - 1;
+					clrline(output_current_row, SCREEN_ROWS);
 					break;
 				case 0: // Refresh bottom line
 					break;
@@ -382,7 +1153,18 @@ int editor_display(EDITOR_DATA *p_editor
 					break;
 				}
 
-				BBS_last_access_tm = time(0);
+				// Refresh current action while user input
+				if (user_online_update(NULL) < 0)
+				{
+					log_error("user_online_update(NULL) error\n");
+				}
+
+				if (input_ok)
+				{
+					break;
+				}
+
+				ch = igetch_t(BBS_max_user_idle_time);
 			}
 
 			continue;
@@ -400,14 +1182,29 @@ int editor_display(EDITOR_DATA *p_editor
 			len = 0;
 		}
 
-		memcpy(buffer, (const char *)p_editor_data->p_display_lines[line_current], (size_t)len);
-		buffer[len] = '\0';
+		// memcpy(buffer, p_editor_data->p_display_lines[line_current], (size_t)len);
+		// Replace '\033' with '*'
+		p_str = p_editor_data->p_display_lines[line_current];
+		for (i = 0, j = 0; i < len; i++)
+		{
+			if (p_str[i] == '\033')
+			{
+				memcpy(buffer + j, EDITOR_ESC_DISPLAY_STR, sizeof(EDITOR_ESC_DISPLAY_STR) - 1);
+				j += (int)(sizeof(EDITOR_ESC_DISPLAY_STR) - 1);
+			}
+			else
+			{
+				buffer[j] = p_str[i];
+				j++;
+			}
+		}
+		buffer[j] = '\0';
 
-		moveto(screen_current_line, 0);
+		moveto(output_current_row, 0);
 		clrtoeol();
 		prints("%s", buffer);
 		line_current++;
-		screen_current_line++;
+		output_current_row++;
 	}
 
 cleanup: