--- lbbs/src/screen.c	2004/10/23 08:22:25	1.5
+++ lbbs/src/screen.c	2025/05/11 11:50:03	1.46
@@ -1,190 +1,544 @@
 /***************************************************************************
-                          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 "bbs.h"
+#include "common.h"
+#include "str_process.h"
+#include "log.h"
 #include "io.h"
+#include "screen.h"
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
 
-int screen_lines = 24;
+#define ACTIVE_BOARD_HEIGHT 8
 
-void
-moveto (int row, int col)
+int screen_rows = 24;
+int screen_cols = 80;
+
+void moveto(int row, int col)
+{
+	if (row >= 0)
+	{
+		prints("\033[%d;%dH", row, col);
+	}
+	else
+	{
+		prints("\r");
+	}
+}
+
+void clrtoeol()
+{
+	prints("\033[K");
+}
+
+void clrline(int line_begin, int line_end)
+{
+	int i;
+
+	for (i = line_begin; i <= line_end; i++)
+	{
+		moveto(i, 0);
+		prints("\033[K");
+	}
+}
+
+void clrtobot(int line_begin)
+{
+	moveto(line_begin, 0);
+	prints("\033[J");
+	moveto(line_begin, 0);
+}
+
+void clearscr()
+{
+	prints("\033[2J");
+	moveto(0, 0);
+}
+
+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)
+	{
+		outc('\x83'); // ASCII code 131
+		iflush();
+	}
+	else
+	{
+		//    outc ('\x85'); // ASCII code 133
+		prints("\xff\xfb\x01\xff\xfb\x03");
+		iflush();
+		igetch(0);
+		igetch(1);
+	}
+}
+
+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++)
+		;
+
+	while (!SYS_server_exit && (c = igetch_t(MIN(MAX_DELAY_TIME, 60))))
+	{
+		if (c == CR)
+		{
+			igetch(1); // Cleanup remaining '\n' in the buffer
+			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(1); // Cleanup remaining input
+				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();
+		}
+	}
+
+	return offset;
+}
+
+int str_input(char *buffer, int buf_size, int echo_mode)
 {
-  if (row >= 0)
-    {
-      prints ("\033[%d;%dH", row, col);
-    }
-  else
-    {
-      prints ("\r");
-    }
-  iflush();
-}
-
-void
-clrtoeol ()
-{
-  prints ("\033[K");
-  iflush();
-}
-
-void
-clrline (int line_begin, int line_end)
-{
-  int i;
-  
-  for (i = line_begin; i <= line_end; i++)
-  {
-    moveto (i, 0);
-    prints ("\033[K");
-  }
-
-  iflush();
-}
-
-void
-clearscr()
-{
-  prints ("\33[2J");
-  moveto (0,0);
-  iflush();
-}
-
-int
-str_input (char *buffer, int buffer_length, int echo_mode)
-{
-  char buf[256], ch;
-  int c, offset = 0, len, loop = 1, i, hz = 0;
-
-  memset (buffer, '\0', buffer_length);
-
-  while (c = igetch ())
-    {
-      if (c == CR || c == LF)
-	break;
-      if (c == BACKSPACE)
-	{
-	  if (offset > 0)
-	    {
-	      buffer[--offset] = '\0';
-	      prints ("\b \b");
-//            clrtoeol ();
-	      iflush ();
-	    }
-	  continue;
-	}
-      if (c > 255 || iscntrl (c))
-	{
-	  continue;
-	}
-      if (c > 127 && c <= 255)
-        {
-          hz = (!hz);
-        }
-      if (offset >= buffer_length)
-	{
-	  outc ('\a');
-	  continue;
-	}
-      buffer[offset++] = (char) c;
-      buffer[offset] = '\0';
-      switch (echo_mode)
-	{
-	case 0:
-	  outc ((char) c);
-	  break;
-	case 1:
-	  outc ('*');
-	  break;
-	}
-      if (!hz)
-        {
-          iflush ();
-        }
-    }
-
-  prints ("\r\n");
-  iflush ();
-
-  return offset;
-}
-
-int
-display_file(const char* filename, int clear, int begin_line)
-{
-  char buffer[260];
-  FILE *fin;
-  int i, line;
-  
-  if (clear)
-  {
-    clrline(begin_line, screen_lines - 1);
-    line = begin_line;
-    moveto (line, 0);
-  }
-  
-  if ((fin = fopen(filename, "r")) != NULL)
-  {
-    while (fgets(buffer, 255, fin))
-    {
-      if (line == screen_lines - 1)
-      {
-      	moveto (screen_lines - 1, 0);
-      	press_any_key();
-      	clrline(begin_line, screen_lines - 1);
-      	line = begin_line;
-      	moveto (line, 0);
-      }
-
-      i = strlen(buffer);
-      if (buffer[i-1] == '\n' && buffer[i-2] != '\r')
-      {
-      	 buffer[i-1] = '\r';
-      	 buffer[i] = '\n';
-      	 buffer[i+1] = '\0';
-      }
-      prints (buffer);
-      iflush ();
-      
-      line ++;
-    }
-    fclose (fin);
-
-    return 0;
-  }
-  
-  return -1;
-}
-
-int
-show_top()
-{
-  return 0;
-}
-
-int
-show_bottom()
-{
-  return 0;
+	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;
+
+	igetch(1); // Cleanup input buffer
+
+	moveto(row, col);
+	prints(prompt);
+	prints(buffer);
+	iflush();
+
+	len = _str_input(buffer, buf_size, echo_mode);
+
+	return len;
 }
 
-int
-press_any_key()
+int display_file(const char *filename)
 {
-  prints ("                          \033[1;33m按任意键盘继续...\033[0;37m");
-  iflush();
+	char buffer[LINE_BUFFER_LEN];
+	FILE *fin;
+	size_t i;
+
+	if ((fin = fopen(filename, "r")) == NULL)
+	{
+		return -1;
+	}
+
+	while (fgets(buffer, sizeof(buffer) - 1, fin))
+	{
+		i = strnlen(buffer, sizeof(buffer) - 1);
+		if (buffer[i - 1] == '\n' && buffer[i - 2] != '\r')
+		{
+			buffer[i - 1] = '\r';
+			buffer[i] = '\n';
+			buffer[i + 1] = '\0';
+		}
+		prints(buffer);
+		iflush();
+	}
+	fclose(fin);
+
+	return 0;
+}
+
+int display_file_ex(const char *filename, int begin_line, int wait)
+{
+	static int show_help = 1;
+	char buffer[LINE_BUFFER_LEN];
+	int ch = 0;
+	int input_ok, line, max_lines;
+	long int c_line_current = 0;
+	long int c_line_total = 0;
+	FILE *fin;
+	long *p_line_offsets;
+	long int len;
+	long int percentile;
+	int loop = 1;
+
+	if ((fin = fopen(filename, "r")) == NULL)
+	{
+		log_error("Unable to open file %s\n", filename);
+		return -1;
+	}
+
+	p_line_offsets = (long *)malloc(sizeof(long) * MAX_FILE_LINES);
+
+	c_line_total = split_file_lines(fin, screen_cols, p_line_offsets, MAX_FILE_LINES);
+
+	clrline(begin_line, screen_rows);
+	line = begin_line;
+	max_lines = screen_rows - 1;
+
+	while (!SYS_server_exit && loop)
+	{
+		if (c_line_current >= c_line_total && c_line_total <= screen_rows - 2)
+		{
+			if (wait)
+			{
+				ch = press_any_key();
+			}
+			else
+			{
+				iflush();
+			}
+
+			loop = 0;
+			break;
+		}
+
+		if (c_line_current >= c_line_total || line >= max_lines)
+		{
+			if (c_line_current - (line - 1) + (screen_rows - 2) < c_line_total)
+			{
+				percentile = (c_line_current - (line - 1) + (screen_rows - 2)) * 100 / c_line_total;
+			}
+			else
+			{
+				percentile = 100;
+			}
+
+			moveto(screen_rows, 0);
+			prints("\033[1;44;32m%s (%d%%)%s\033[33m          │ 结束 ← <q> │ ↑/↓/PgUp/PgDn 移动 │ ? 辅助说明 │     \033[m",
+				   (percentile < 100 ? "下面还有喔" : "没有更多了"), percentile,
+				   (percentile < 10 ? "  " : (percentile < 100 ? " " : "")));
+			iflush();
+
+			input_ok = 0;
+			while (!SYS_server_exit && !input_ok)
+			{
+				ch = igetch_t(MAX_DELAY_TIME);
+				input_ok = 1;
+				switch (ch)
+				{
+				case KEY_NULL:
+				case KEY_TIMEOUT:
+					goto cleanup;
+				case KEY_UP:
+					if (c_line_current - line < 0) // Reach top
+					{
+						break;
+					}
+					c_line_current -= line;
+					line = begin_line;
+					// max_lines = begin_line + 1;
+					// prints("\033[T"); // Scroll down 1 line
+					max_lines = screen_rows - 1; // Legacy Fterm only works with this line
+					break;
+				case KEY_DOWN:
+				case CR:
+					if (c_line_current + ((screen_rows - 2) - (line - 1)) >= c_line_total) // Reach bottom
+					{
+						break;
+					}
+					c_line_current += ((screen_rows - 2) - (line - 1));
+					line = screen_rows - 2;
+					max_lines = screen_rows - 1;
+					moveto(screen_rows, 0);
+					clrtoeol();
+					prints("\033[S"); // Scroll up 1 line
+					break;
+				case KEY_PGUP:
+				case Ctrl('B'):
+					if (c_line_current - line < 0) // Reach top
+					{
+						break;
+					}
+					c_line_current -= ((screen_rows - 3) + (line - 1));
+					if (c_line_current < 0)
+					{
+						c_line_current = 0;
+					}
+					line = begin_line;
+					max_lines = screen_rows - 1;
+					clrline(begin_line, screen_rows);
+					break;
+				case KEY_RIGHT:
+				case KEY_PGDN:
+				case Ctrl('F'):
+				case KEY_SPACE:
+					if (c_line_current + (screen_rows - 2) - (line - 1) >= c_line_total) // Reach bottom
+					{
+						break;
+					}
+					c_line_current += (screen_rows - 3) - (line - 1);
+					if (c_line_current + screen_rows - 2 > c_line_total) // No enough lines to display
+					{
+						c_line_current = c_line_total - (screen_rows - 2);
+					}
+					line = begin_line;
+					max_lines = screen_rows - 1;
+					clrline(begin_line, screen_rows);
+					break;
+				case KEY_LEFT:
+				case 'q':
+				case 'Q':
+					loop = 0;
+					break;
+				case '?':
+				case 'h':
+				case 'H':
+					if (!show_help)
+					{
+						break;
+					}
+
+					// Display help information
+					show_help = 0;
+					display_file_ex(DATA_READ_HELP, begin_line, 1);
+					show_help = 1;
+
+					// Refresh after display help information
+					c_line_current -= (line - 1);
+					line = begin_line;
+					max_lines = screen_rows - 1;
+					clrline(begin_line, screen_rows);
+					break;
+				default:
+					input_ok = 0;
+					break;
+				}
+
+				BBS_last_access_tm = time(0);
+			}
+
+			continue;
+		}
+
+		fseek(fin, p_line_offsets[c_line_current], SEEK_SET);
+		len = p_line_offsets[c_line_current + 1] - p_line_offsets[c_line_current];
+		if (len >= LINE_BUFFER_LEN)
+		{
+			log_error("Error length exceeds buffer size: %d\n", len);
+			len = LINE_BUFFER_LEN - 1;
+		}
+		if (fgets(buffer, (int)len + 1, fin) == NULL)
+		{
+			log_error("Reach EOF\n");
+			break;
+		}
+		moveto(line, 0);
+		clrtoeol();
+		prints("%s", buffer);
+		c_line_current++;
+		line++;
+	}
+
+cleanup:
+	free(p_line_offsets);
+	fclose(fin);
+
+	return ch;
+}
+
+int show_top(char *status)
+{
+	int end_of_line;
+	int display_len;
+	unsigned int len;
+
+	char space1[LINE_BUFFER_LEN];
+	char space2[LINE_BUFFER_LEN];
+
+	len = split_line(status, 20, &end_of_line, &display_len);
+	if (end_of_line)
+	{
+		status[len] = '\0';
+	}
+	str_space(space1, 31 - display_len);
+
+	len = split_line(BBS_current_section_name, 20, &end_of_line, &display_len);
+	if (end_of_line)
+	{
+		status[len] = '\0';
+	}
+	str_space(space2, 30 - display_len);
+
+	moveto(1, 0);
+	clrtoeol();
+	prints("\033[1;44;33m%s \033[37m%s%s%s\033[33m 讨论区 [%s]\033[m",
+		   status, space1, BBS_name, space2, BBS_current_section_name);
+	iflush();
+
+	return 0;
+}
+
+int show_bottom(char *msg)
+{
+	char str_time[LINE_BUFFER_LEN];
+	char space[LINE_BUFFER_LEN];
+	time_t time_online;
+	struct tm *tm_online;
+
+	get_time_str(str_time, sizeof(str_time));
+	str_space(space, 34 - (int)strnlen(BBS_username, sizeof(BBS_username)));
+
+	time_online = time(0) - BBS_login_tm;
+	tm_online = gmtime(&time_online);
+
+	moveto(screen_rows, 0);
+	clrtoeol();
+	prints("\033[1;44;33m[\033[36m%s\033[33m]%s帐号[\033[36m%s\033[33m]"
+		   "[\033[36m%1d\033[33m:\033[36m%2d\033[33m:\033[36m%2d\033[33m]\033[m",
+		   str_time, space, BBS_username, tm_online->tm_mday - 1,
+		   tm_online->tm_hour, tm_online->tm_min);
+	iflush();
+
+	return 0;
+}
+
+int show_active_board()
+{
+	char filename[FILE_PATH_LEN];
+	char buffer[LINE_BUFFER_LEN];
+	FILE *fin;
+	static int line;
+	unsigned int len;
+	int end_of_line;
+	int display_len;
+
+	clrline(3, 2 + ACTIVE_BOARD_HEIGHT);
+
+	if ((fin = fopen(DATA_ACTIVE_BOARD, "r")) == NULL)
+	{
+		log_error("Unable to open file %s\n", filename);
+		return -1;
+	}
+
+	for (int i = 0; i < line; i++)
+	{
+		if (fgets(buffer, sizeof(buffer), fin) == NULL)
+		{
+			line = 0;
+			rewind(fin);
+			break;
+		}
+	}
+
+	for (int i = 0; i < ACTIVE_BOARD_HEIGHT; i++)
+	{
+		if (fgets(buffer, sizeof(buffer), fin) == NULL)
+		{
+			line = 0;
+			break;
+		}
+		line++;
+		len = split_line(buffer, screen_cols, &end_of_line, &display_len);
+		buffer[len] = '\0'; // Truncate over-length line
+		moveto(3 + i, 0);
+		prints("%s", buffer);
+	}
+	iflush();
+
+	fclose(fin);
 
-  return igetch ();
+	return 0;
 }