--- lbbs/src/screen.c	2004/10/22 18:47:51	1.2
+++ lbbs/src/screen.c	2025/06/11 10:44:33	1.92
@@ -1,148 +1,682 @@
 /***************************************************************************
-                          screen.c  -  description
-                             -------------------
-    begin                : Mon Oct 18 2004
-    copyright            : (C) 2004 by Leaflet
-    email                : leaflet@leafok.com
+						  screen.c  -  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 2 of the License, or     *
+ *   the Free Software Foundation; either version 3 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
 
+#include "screen.h"
+#include "bbs.h"
+#include "common.h"
+#include "str_process.h"
+#include "log.h"
 #include "io.h"
+#include "editor.h"
+#include "file_loader.h"
+#include <fcntl.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <sys/shm.h>
+
+#define _POSIX_C_SOURCE 200809L
+#include <string.h>
+
+#define ACTIVE_BOARD_HEIGHT 8
+
+#define STR_TOP_LEFT_MAX_LEN 40
+#define STR_TOP_MIDDLE_MAX_LEN 20
+#define STR_TOP_RIGHT_MAX_LEN 20
 
-void
-moveto (int row, int col)
+void moveto(int row, int col)
 {
-  if (row >= 0)
-    {
-      prints ("\033[%d;%dH", row, col);
-    }
-  else
-    {
-      prints ("\r");
-    }
-  iflush();
+	if (row >= 0)
+	{
+		prints("\033[%d;%dH", row, col);
+	}
+	else
+	{
+		prints("\r");
+	}
 }
 
-void
-clrtoeol ()
+void clrtoeol()
 {
-  prints ("\033[K");
-  iflush();
+	prints(CTRL_SEQ_CLR_LINE);
 }
 
-void
-clearscr()
+void clrline(int line_begin, int line_end)
 {
-  prints ("\33[2J");
-  moveto (0,0);
-  iflush();
+	int i;
+
+	for (i = line_begin; i <= line_end; i++)
+	{
+		moveto(i, 0);
+		prints(CTRL_SEQ_CLR_LINE);
+	}
 }
 
-int
-str_input (char *buffer, int buffer_length, int echo_mode)
+void clrtobot(int line_begin)
 {
-  char buf[256], ch;
-  int c, offset = 0, len, loop = 1, i, hz = 0;
+	moveto(line_begin, 0);
+	prints("\033[J");
+	moveto(line_begin, 0);
+}
 
-  memset (buffer, '\0', buffer_length);
+void clearscr()
+{
+	prints("\033[2J");
+	moveto(0, 0);
+}
 
-  while (c = igetch ())
-    {
-      if (c == CR || c == LF)
-	break;
-      if (c == BACKSPACE)
+int press_any_key()
+{
+	moveto(SCREEN_ROWS, 0);
+	clrtoeol();
+
+	prints("                           \033[1;33m按任意键继续...\033[0;37m");
+	iflush();
+
+	return igetch_t(MIN(MAX_DELAY_TIME, 60));
+}
+
+void set_input_echo(int echo)
+{
+	if (echo)
 	{
-	  if (offset > 0)
-	    {
-	      buffer[--offset] = '\0';
-	      prints ("\b \b");
-//            clrtoeol ();
-	      iflush ();
-	    }
-	  continue;
+		outc('\x83'); // ASCII code 131
+		iflush();
 	}
-      if (c > 255 || iscntrl (c))
+	else
 	{
-	  continue;
+		//    outc ('\x85'); // ASCII code 133
+		prints("\xff\xfb\x01\xff\xfb\x03");
+		iflush();
+		igetch(0);
+		igetch_reset();
 	}
-      if (c > 127 && c <= 255)
-        {
-          hz = (!hz);
-        }
-      if (offset >= buffer_length)
+}
+
+static int _str_input(char *buffer, int buf_size, int echo_mode)
+{
+	int c;
+	int offset = 0;
+	int hz = 0;
+
+	buffer[buf_size - 1] = '\0';
+	for (offset = 0; offset < buf_size - 1 && buffer[offset] != '\0'; offset++)
+		;
+
+	igetch_reset();
+
+	while (!SYS_server_exit)
 	{
-	  outc ('\a');
-	  continue;
+		c = igetch_t(MIN(MAX_DELAY_TIME, 60));
+
+		if (c == CR)
+		{
+			igetch_reset();
+			break;
+		}
+		else if (c == KEY_TIMEOUT || c == KEY_NULL) // timeout or broken pipe
+		{
+			return -1;
+		}
+		else if (c == LF || c == '\0')
+		{
+			continue;
+		}
+		else if (c == BACKSPACE)
+		{
+			if (offset > 0)
+			{
+				offset--;
+				if (buffer[offset] < 0 || buffer[offset] > 127)
+				{
+					prints("\033[D \033[D");
+					offset--;
+					if (offset < 0) // should not happen
+					{
+						log_error("Offset of buffer is negative\n");
+						offset = 0;
+					}
+				}
+				buffer[offset] = '\0';
+				prints("\033[D \033[D");
+				iflush();
+			}
+			continue;
+		}
+		else if (c > 255 || iscntrl(c))
+		{
+			continue;
+		}
+		else if (c > 127 && c <= 255)
+		{
+			if (!hz && offset + 2 > buf_size - 1) // No enough space for Chinese character
+			{
+				igetch(0); // Ignore 1 character
+				outc('\a');
+				iflush();
+				continue;
+			}
+			hz = (!hz);
+		}
+
+		if (offset + 1 > buf_size - 1)
+		{
+			outc('\a');
+			iflush();
+			continue;
+		}
+
+		buffer[offset++] = (char)c;
+		buffer[offset] = '\0';
+
+		switch (echo_mode)
+		{
+		case DOECHO:
+			outc((char)c);
+			break;
+		case NOECHO:
+			outc('*');
+			break;
+		}
+		if (!hz)
+		{
+			iflush();
+		}
 	}
-      buffer[offset++] = (char) c;
-      buffer[offset] = '\0';
-      switch (echo_mode)
+
+	return offset;
+}
+
+int str_input(char *buffer, int buf_size, int echo_mode)
+{
+	int len;
+
+	buffer[0] = '\0';
+
+	len = _str_input(buffer, buf_size, echo_mode);
+
+	prints("\r\n");
+	iflush();
+
+	return len;
+};
+
+int get_data(int row, int col, char *prompt, char *buffer, int buf_size, int echo_mode)
+{
+	int len;
+
+	moveto(row, col);
+	prints("%s", prompt);
+	prints("%s", buffer);
+	iflush();
+
+	len = _str_input(buffer, buf_size, echo_mode);
+
+	return len;
+}
+
+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)
+{
+	static int show_help = 1;
+	char buffer[LINE_BUFFER_LEN];
+	DISPLAY_CTX ctx;
+	int ch = 0;
+	int input_ok;
+	int screen_current_row;
+	const int screen_begin_row = 1;
+	int screen_end_row = SCREEN_ROWS - 1;
+	const int screen_row_total = screen_end_row - screen_begin_row + 1;
+	long int line_current = 0;
+	long int len;
+	long int percentile;
+	int loop;
+	int eol, display_len;
+
+	clrline(screen_begin_row, SCREEN_ROWS);
+	screen_current_row = screen_begin_row;
+
+	// update msg_ext with extended key handler
+	if (key_handler(&ch, &ctx) != 0)
 	{
-	case 0:
-	  outc ((char) c);
-	  break;
-	case 1:
-	  outc ('*');
-	  break;
+		return ch;
 	}
-      if (!hz)
-        {
-          iflush ();
-        }
-    }
 
-  prints ("\r\n");
-  iflush ();
+	loop = 1;
+	while (!SYS_server_exit && loop)
+	{
+		if (eof_exit > 0 && line_current >= display_line_total && display_line_total <= screen_row_total)
+		{
+			if (eof_exit == 1)
+			{
+				ch = press_any_key();
+			}
+			else // if (eof_exit == 2)
+			{
+				iflush();
+			}
+
+			loop = 0;
+			break;
+		}
+
+		if (line_current >= display_line_total || screen_current_row > screen_end_row)
+		{
+			ctx.reach_begin = (line_current < screen_current_row ? 1 : 0);
+
+			if (line_current - (screen_current_row - screen_begin_row) + screen_row_total < display_line_total)
+			{
+				percentile = (line_current - (screen_current_row - screen_begin_row) + screen_row_total) * 100 / display_line_total;
+				ctx.reach_end = 0;
+			}
+			else
+			{
+				percentile = 100;
+				ctx.reach_end = 1;
+			}
+
+			ctx.line_top = line_current - (screen_current_row - screen_begin_row) + 1;
+			ctx.line_bottom = MIN(line_current - (screen_current_row - screen_begin_row) + screen_row_total, display_line_total);
+
+			snprintf(buffer, sizeof(buffer),
+					 "\033[1;44;33m第\033[32m%ld\033[33m-\033[32m%ld\033[33m行 (\033[32m%ld%%\033[33m) %s",
+					 ctx.line_top,
+					 ctx.line_bottom,
+					 percentile,
+					 ctx.msg);
+
+			len = split_line(buffer, SCREEN_COLS, &eol, &display_len);
+			for (; display_len < SCREEN_COLS; display_len++)
+			{
+				buffer[len++] = ' ';
+			}
+			buffer[len] = '\0';
+			strncat(buffer, "\033[m", sizeof(buffer) - 1 - strnlen(buffer, sizeof(buffer)));
+
+			moveto(SCREEN_ROWS, 0);
+			prints("%s", buffer);
+			iflush();
+
+			input_ok = 0;
+			while (!SYS_server_exit && !input_ok)
+			{
+				ch = igetch_t(MAX_DELAY_TIME);
+				input_ok = 1;
+
+				// extended key handler
+				if (key_handler(&ch, &ctx) != 0)
+				{
+					goto cleanup;
+				}
+
+				switch (ch)
+				{
+				case KEY_NULL:
+				case KEY_TIMEOUT:
+					goto cleanup;
+				case KEY_HOME:
+					if (line_current - screen_current_row < 0) // Reach begin
+					{
+						break;
+					}
+					line_current = 0;
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case KEY_END:
+					if (display_line_total < screen_row_total)
+					{
+						break;
+					}
+					line_current = display_line_total - screen_row_total;
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case KEY_UP:
+					if (line_current - screen_current_row < 0) // Reach begin
+					{
+						break;
+					}
+					line_current -= screen_current_row;
+					screen_current_row = screen_begin_row;
+					// screen_end_line = screen_begin_line;
+					// prints("\033[T"); // Scroll down 1 line
+					screen_end_row = SCREEN_ROWS - 1; // Legacy Fterm only works with this line
+					break;
+				case CR:
+					igetch_reset();
+				case KEY_SPACE:
+				case KEY_DOWN:
+					if (line_current + (screen_row_total - (screen_current_row - screen_begin_row)) >= display_line_total) // Reach end
+					{
+						break;
+					}
+					line_current += (screen_row_total - (screen_current_row - screen_begin_row));
+					screen_current_row = screen_row_total;
+					screen_end_row = SCREEN_ROWS - 1;
+					moveto(SCREEN_ROWS, 0);
+					clrtoeol();
+					prints("\033[S"); // Scroll up 1 line
+					break;
+				case KEY_PGUP:
+					if (line_current - screen_current_row < 0) // Reach begin
+					{
+						break;
+					}
+					line_current -= ((screen_row_total - 1) + (screen_current_row - screen_begin_row));
+					if (line_current < 0)
+					{
+						line_current = 0;
+					}
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case KEY_PGDN:
+					if (line_current + screen_row_total - (screen_current_row - screen_begin_row) >= display_line_total) // Reach end
+					{
+						break;
+					}
+					line_current += (screen_row_total - 1) - (screen_current_row - screen_begin_row);
+					if (line_current + screen_row_total > display_line_total) // No enough lines to display
+					{
+						line_current = display_line_total - screen_row_total;
+					}
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case KEY_ESC:
+				case KEY_LEFT:
+					loop = 0;
+					break;
+				case 'h':
+					if (!show_help) // Not reentrant
+					{
+						break;
+					}
+					// Display help information
+					show_help = 0;
+					display_file(help_filename, 1);
+					show_help = 1;
+				case KEY_F5:
+					// Refresh after display help information
+					line_current -= (screen_current_row - screen_begin_row);
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case KEY_F2: // For test only
+					EDITOR_DATA *p_editor_data;
+					size_t data_new_len = strlen(p_data) + LINE_BUFFER_LEN;
+
+					char *p_data_new = malloc(data_new_len);
+					if (p_data_new == NULL)
+					{
+						break;
+					}
+					p_editor_data = editor_data_load(p_data);
+					if (p_editor_data == NULL)
+					{
+						free(p_data_new);
+						break;
+					}
+
+					editor_display(p_editor_data);
+					editor_data_save(p_editor_data, p_data_new, data_new_len);
+					editor_data_cleanup(p_editor_data);
+					p_editor_data = NULL;
+					free(p_data_new);
+					p_data_new = NULL;
+
+					// Refresh after display editor
+					line_current -= (screen_current_row - screen_begin_row);
+					screen_current_row = screen_begin_row;
+					screen_end_row = SCREEN_ROWS - 1;
+					clrline(screen_begin_row, SCREEN_ROWS);
+					break;
+				case 0: // Refresh bottom line
+					break;
+				default:
+					input_ok = 0;
+					break;
+				}
+
+				BBS_last_access_tm = time(0);
+			}
+
+			continue;
+		}
+
+		len = p_line_offsets[line_current + 1] - p_line_offsets[line_current];
+		if (len >= sizeof(buffer))
+		{
+			log_error("Buffer overflow: len=%ld(%ld - %ld) line=%ld \n",
+					  len, p_line_offsets[line_current + 1], p_line_offsets[line_current], line_current);
+			len = sizeof(buffer) - 1;
+		}
+		else if (len < 0)
+		{
+			log_error("Incorrect line offsets: len=%ld(%ld - %ld) line=%ld \n",
+					  len, p_line_offsets[line_current + 1], p_line_offsets[line_current], line_current);
+			len = 0;
+		}
+
+		memcpy(buffer, (const char *)p_data + p_line_offsets[line_current], (size_t)len);
+		buffer[len] = '\0';
+
+		moveto(screen_current_row, 0);
+		clrtoeol();
+		prints("%s", buffer);
+		line_current++;
+		screen_current_row++;
+	}
+
+cleanup:
+	return ch;
+}
+
+static int display_file_key_handler(int *p_key, DISPLAY_CTX *p_ctx)
+{
+	switch (*p_key)
+	{
+	case 0: // Set msg
+		snprintf(p_ctx->msg, sizeof(p_ctx->msg),
+				 "| 返回[\033[32m←\033[33m,\033[32mESC\033[33m] | "
+				 "移动[\033[32m↑\033[33m/\033[32m↓\033[33m/\033[32mPgUp\033[33m/\033[32mPgDn\033[33m] | "
+				 "帮助[\033[32mh\033[33m] |");
+		break;
+	}
 
-  return offset;
+	return 0;
 }
 
-int
-display_file(const char* filename)
+int display_file(const char *filename, int eof_exit)
 {
-  char buffer[256];
-  FILE *fin;
-  
-  if ((fin = fopen(filename, "r")) != NULL)
-  {
-    while (fgets(buffer, 255, fin))
-    {
-      prints (buffer);
-      iflush ();
-    }
-    fclose (fin);
+	int ret;
+	const void *p_shm;
+	size_t data_len;
+	long line_total;
+	const void *p_data;
+	const long *p_line_offsets;
+
+	if ((p_shm = get_file_shm_readonly(filename, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+	{
+		log_error("get_file_shm(%s) error\n", filename);
+		return KEY_NULL;
+	}
+
+	ret = display_data(p_data, line_total, p_line_offsets, eof_exit, display_file_key_handler, DATA_READ_HELP);
+
+	if (detach_file_shm(p_shm) < 0)
+	{
+		log_error("detach_file_shm(%s) error\n", filename);
+	}
 
-    return 0;
-  }
-  
-  return -1;
+	return ret;
 }
 
-int
-show_top()
+int show_top(const char *str_left, const char *str_middle, const char *str_right)
 {
-  return 0;
+	char str_left_f[STR_TOP_LEFT_MAX_LEN + 1];
+	char str_middle_f[STR_TOP_MIDDLE_MAX_LEN + 1];
+	char str_right_f[STR_TOP_RIGHT_MAX_LEN + 1];
+	int str_left_len;
+	int str_middle_len;
+	int str_right_len;
+	int eol;
+	int len;
+
+	strncpy(str_left_f, str_left, sizeof(str_left_f) - 1);
+	str_left_f[sizeof(str_left_f) - 1] = '\0';
+	len = split_line(str_left_f, STR_TOP_LEFT_MAX_LEN, &eol, &str_left_len);
+	str_left_f[len] = '\0';
+
+	strncpy(str_middle_f, str_middle, sizeof(str_middle_f) - 1);
+	str_middle_f[sizeof(str_middle_f) - 1] = '\0';
+	len = split_line(str_middle, STR_TOP_MIDDLE_MAX_LEN, &eol, &str_middle_len);
+	str_middle_f[len] = '\0';
+
+	strncpy(str_right_f, str_right, sizeof(str_right_f) - 1);
+	str_right_f[sizeof(str_right_f) - 1] = '\0';
+	len = split_line(str_right, STR_TOP_RIGHT_MAX_LEN, &eol, &str_right_len);
+	str_right_f[len] = '\0';
+
+	moveto(1, 0);
+	clrtoeol();
+	prints("\033[1;44;33m%s\033[37m%*s\033[33m%*s\033[m",
+		   str_left_f, 44 - str_left_len, str_middle_f, 36, str_right_f);
+
+	return 0;
 }
 
-int
-show_bottom()
+int show_bottom(const char *msg)
 {
-  return 0;
+	char str_time[LINE_BUFFER_LEN];
+	time_t time_online;
+	struct tm *tm_online;
+	char msg_f[LINE_BUFFER_LEN];
+	int eol;
+	int msg_len;
+	int len;
+	int len_username;
+	char str_tm_online[LINE_BUFFER_LEN];
+
+	get_time_str(str_time, sizeof(str_time));
+
+	msg_f[0] = '\0';
+	msg_len = 0;
+	if (msg != NULL)
+	{
+		strncpy(msg_f, msg, sizeof(msg_f) - 1);
+		msg_f[sizeof(msg_f) - 1] = '\0';
+		len = split_line(msg_f, 23, &eol, &msg_len);
+		msg_f[len] = '\0';
+	}
+
+	len_username = (int)strnlen(BBS_username, sizeof(BBS_username));
+
+	time_online = time(0) - BBS_login_tm;
+	tm_online = gmtime(&time_online);
+	if (tm_online->tm_mday > 1)
+	{
+		snprintf(str_tm_online, sizeof(str_tm_online),
+				 "\033[36m%2d\033[33m天\033[36m%2d\033[33m时",
+				 tm_online->tm_mday - 1, tm_online->tm_hour);
+	}
+	else
+	{
+		snprintf(str_tm_online, sizeof(str_tm_online),
+				 "\033[36m%2d\033[33m时\033[36m%2d\033[33m分",
+				 tm_online->tm_hour, tm_online->tm_min);
+	}
+
+	moveto(SCREEN_ROWS, 0);
+	clrtoeol();
+	prints("\033[1;44;33m时间[\033[36m%s\033[33m]%s%*s \033[33m帐号[\033[36m%s\033[33m][%s\033[33m]\033[m",
+		   str_time, msg_f, 38 - msg_len - len_username, "", BBS_username, str_tm_online);
+
+	return 0;
 }
 
-int
-press_any_key()
+int show_active_board()
 {
-  prints ("                       \033[1;33m按任意键盘继续...\033[0;37m                       \r\n");
-  iflush();
+	static int line_current = 0;
+	static const void *p_shm = NULL;
+	static size_t data_len;
+	static long line_total;
+	static const void *p_data;
+	static const long *p_line_offsets;
+
+	static time_t t_last_show = 0;
+	static int line_last = 0;
+
+	char buffer[LINE_BUFFER_LEN];
+	long int len;
+
+	if (p_shm == NULL)
+	{
+		if ((p_shm = get_file_shm_readonly(DATA_ACTIVE_BOARD, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+		{
+			log_error("get_file_shm(%s) error\n", DATA_ACTIVE_BOARD);
+			return KEY_NULL;
+		}
+	}
+
+	if (time(0) - t_last_show >= 10)
+	{
+		line_last = line_current;
+		t_last_show = time(0);
+	}
+	else
+	{
+		line_current = line_last;
+	}
+
+	clrline(2, 2 + ACTIVE_BOARD_HEIGHT);
+
+	for (int i = 0; i < ACTIVE_BOARD_HEIGHT; i++)
+	{
+		len = p_line_offsets[line_current + 1] - p_line_offsets[line_current];
+		if (len >= LINE_BUFFER_LEN)
+		{
+			log_error("buffer overflow: len=%ld(%ld - %ld) line=%ld \n",
+					  len, p_line_offsets[line_current + 1], p_line_offsets[line_current], line_current);
+			len = LINE_BUFFER_LEN - 1;
+		}
+
+		memcpy(buffer, (const char *)p_data + p_line_offsets[line_current], (size_t)len);
+		buffer[len] = '\0';
+
+		moveto(3 + i, 0);
+		prints("%s", buffer);
+
+		line_current++;
+		if (line_current >= line_total)
+		{
+			line_current = 0;
+			break;
+		}
+	}
 
-  return igetch ();
+	return 0;
 }