lbbs/src/screen.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * screen
 *   - advanced telnet-based user interactive input / output features
 *
 * Copyright (C) 2004-2026  Leaflet <leaflet@leafok.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "bbs.h"
#include "common.h"
#include "editor.h"
#include "file_loader.h"
#include "io.h"
#include "log.h"
#include "login.h"
#include "screen.h"
#include "str_process.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>

const char CTRL_SEQ_CLR_LINE[] = "\033[K";

static const int ACTIVE_BOARD_HEIGHT = 8;

static const int STR_TOP_LEFT_MAX_LEN = 80;
static const int STR_TOP_MIDDLE_MAX_LEN = 40;
static const int STR_TOP_RIGHT_MAX_LEN = 80;

static size_t get_time_str(char *s, size_t len)
{
        time_t curtime;
        struct tm local_tm;

        time(&curtime);
        localtime_r(&curtime, &local_tm);
        size_t j = strftime(s, len, "%m/%d %H:%M %Z", &local_tm);

        return j;
}

void moveto(int row, int col)
{
        if (row >= 0)
        {
                prints("\033[%d;%dH", row, col);
        }
        else
        {
                prints("\r");
        }
}

void clrtoeol()
{
        prints(CTRL_SEQ_CLR_LINE);
}

void clrline(int line_begin, int line_end)
{
        int i;

        for (i = line_begin; i <= line_end; i++)
        {
                moveto(i, 0);
                prints(CTRL_SEQ_CLR_LINE);
        }
}

void clrtobot(int line_begin)
{
        moveto(line_begin, 0);
        prints("\033[J");
        moveto(line_begin, 0);
}

void clearscr()
{
        prints("\033[2J");
        moveto(1, 1);
}

inline int press_any_key()
{
        return press_any_key_ex("                           \033[1;33m按任意键继续...\033[m", 60);
}

int press_any_key_ex(const char *msg, int sec)
{
        moveto(SCREEN_ROWS, 0);
        clrtoeol();

        prints(msg);
        iflush();

        return press_any_key_no_prompt(sec);
}

inline int press_any_key_no_prompt(int sec)
{
        int ch = 0;
        int duration = 0;
        time_t t_begin = time(NULL);

        igetch_reset();

        do
        {
                ch = igetch_t(sec - duration);
                duration = (int)(time(NULL) - t_begin);
        } while (!SYS_server_exit && ch == 0 && duration < 60);

        return ch;
}

void set_input_echo(int echo)
{
        if (echo)
        {
                outc('\x83'); // ASCII code 131
        }
        else
        {
                // outc ('\x85'); // ASCII code 133
                prints("\xff\xfb\x01\xff\xfb\x03");
        }
        iflush();
}

static int _str_input(char *buffer, int buf_size, int max_display_len, enum io_echo_t echo_mode)
{
        int ch;
        int offset = 0;
        int eol;
        int display_len;
        char input_str[5];
        int str_len = 0;
        wchar_t wcs[2];
        char c;

        buffer[buf_size - 1] = '\0';
        offset = split_line(buffer, max_display_len, &eol, &display_len, 0);

        igetch_reset();

        while (!SYS_server_exit)
        {
                ch = igetch_t(MIN(BBS_max_user_idle_time, 60));

                if (ch == CR)
                {
                        break;
                }
                else if (ch == KEY_TIMEOUT || ch == KEY_NULL) // timeout or broken pipe
                {
                        return -1;
                }
                else if (ch == LF || ch == '\0')
                {
                        continue;
                }
                else if (ch == BACKSPACE || ch == KEY_DEL)
                {
                        if (offset > 0)
                        {
                                offset--;
                                if (buffer[offset] < 0 || buffer[offset] > 127) // UTF8
                                {
                                        while (offset > 0 && (buffer[offset] & 0xc0) != 0xc0)
                                        {
                                                offset--;
                                        }
                                        display_len--;
                                        prints("\033[D \033[D");
                                }
                                buffer[offset] = '\0';
                                display_len--;
                                prints("\033[D \033[D");
                                iflush();
                        }
                        continue;
                }
                else if (ch > 255 || iscntrl(ch))
                {
                        continue;
                }
                else if ((ch & 0xff80) == 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
                                {
                                        log_debug("Ignore %d bytes of incomplete UTF8 character", str_len);
                                        str_len = 0;
                                        break;
                                }
                        }
                        input_str[str_len] = '\0';

                        if (str_len == 0) // Incomplete input
                        {
                                continue;
                        }

                        if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
                        {
                                log_error("mbstowcs() error");
                        }
                        if (offset + str_len > buf_size - 1 || display_len + (UTF8_fixed_width ? 2 : wcwidth(wcs[0])) > max_display_len) // No enough space for Chinese character
                        {
                                outc('\a');
                                iflush();
                                continue;
                        }

                        memcpy(buffer + offset, input_str, (size_t)str_len);
                        offset += str_len;
                        buffer[offset] = '\0';
                        display_len += 2;

                        switch (echo_mode)
                        {
                        case DOECHO:
                                prints(input_str);
                                break;
                        case NOECHO:
                                prints("**");
                                break;
                        }
                }
                else if (ch >= 32 && ch < 127) // Printable character
                {
                        if (offset + 1 > buf_size - 1 || display_len + 1 > max_display_len)
                        {
                                outc('\a');
                                iflush();
                                continue;
                        }

                        buffer[offset++] = (char)ch;
                        buffer[offset] = '\0';
                        display_len++;

                        switch (echo_mode)
                        {
                        case DOECHO:
                                outc((char)ch);
                                break;
                        case NOECHO:
                                outc('*');
                                break;
                        }
                }
                else // Invalid character
                {
                        continue;
                }

                iflush();
        }

        return offset;
}

int str_input(char *buffer, int buf_size, enum io_echo_t echo_mode)
{
        int len;

        buffer[0] = '\0';

        len = _str_input(buffer, buf_size, 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 max_display_len)
{
        int len = 0;
        int col_cur = 0;
        int ch;
        int offset = 0;
        int eol;
        int display_len;
        char input_str[5];
        int str_len = 0;
        wchar_t wcs[2];
        int wc_len;
        char c;

        buffer[buf_size - 1] = '\0';
        offset = split_line(buffer, max_display_len, &eol, &display_len, 0);
        buffer[offset] = '\0';
        len = offset;
        col_cur = col + str_length(prompt, 1) + display_len;

        moveto(row, col);
        prints("%s", prompt);
        prints("%s", buffer);
        prints("%*s", max_display_len - display_len, "");
        moveto(row, col_cur);
        iflush();

        igetch_reset();

        while (!SYS_server_exit)
        {
                ch = igetch_t(MIN(BBS_max_user_idle_time, 60));

                if (ch == CR)
                {
                        break;
                }
                else if (ch == KEY_TIMEOUT || ch == KEY_NULL) // timeout or broken pipe
                {
                        return -1;
                }
                else if (ch == LF || ch == '\0')
                {
                        continue;
                }
                else if (ch == BACKSPACE)
                {
                        if (offset > 0)
                        {
                                str_len = 1;
                                offset--;
                                if (buffer[offset] < 0 || buffer[offset] > 127) // UTF8
                                {
                                        while (offset > 0 && (buffer[offset] & 0xc0) != 0xc0)
                                        {
                                                str_len++;
                                                offset--;
                                        }

                                        if (mbstowcs(wcs, buffer + offset, 1) == (size_t)-1)
                                        {
                                                log_error("mbstowcs() error");
                                        }
                                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));

                                        if (wc_len == 2)
                                        {
                                                display_len--;
                                                col_cur--;
                                        }
                                }

                                memmove(buffer + offset, buffer + offset + str_len, (size_t)(len - offset - str_len));
                                len -= str_len;
                                buffer[len] = '\0';
                                display_len--;
                                col_cur--;

                                moveto(row, col_cur);
                                prints("%s", buffer + offset);
                                prints("%*s", max_display_len - display_len, "");
                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch == KEY_DEL)
                {
                        if (offset < len)
                        {
                                if ((buffer[offset] & 0x80) == 0x80) // head of multi-byte character
                                {
                                        str_len = 0;
                                        c = (char)(buffer[offset] & 0xf0);
                                        while (c & 0x80)
                                        {
                                                str_len++;
                                                c = (c & 0x7f) << 1;
                                        }
                                        display_len--;
                                }
                                else
                                {
                                        str_len = 1;
                                }

                                memmove(buffer + offset, buffer + offset + str_len, (size_t)(len - offset - str_len));
                                len -= str_len;
                                buffer[len] = '\0';
                                display_len--;

                                moveto(row, col_cur);
                                prints("%s", buffer + offset);
                                prints("%*s", max_display_len - display_len, "");
                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch == KEY_LEFT)
                {
                        if (offset > 0)
                        {
                                str_len = 1;
                                offset--;
                                if (buffer[offset] < 0 || buffer[offset] > 127) // UTF8
                                {
                                        while (offset > 0 && (buffer[offset] & 0xc0) != 0xc0)
                                        {
                                                str_len++;
                                                offset--;
                                        }

                                        if (mbstowcs(wcs, buffer + offset, 1) == (size_t)-1)
                                        {
                                                log_error("mbstowcs() error");
                                        }
                                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));

                                        if (wc_len == 2)
                                        {
                                                col_cur--;
                                        }
                                }
                                col_cur--;

                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch == KEY_RIGHT)
                {
                        if (offset < len)
                        {
                                str_len = 0;
                                if ((buffer[offset] & 0x80) == 0x80) // head of multi-byte character
                                {
                                        c = (char)(buffer[offset] & 0xf0);
                                        while (c & 0x80)
                                        {
                                                str_len++;
                                                c = (c & 0x7f) << 1;
                                        }

                                        if (mbstowcs(wcs, buffer + offset, 1) == (size_t)-1)
                                        {
                                                log_error("mbstowcs() error");
                                        }
                                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));

                                        if (wc_len == 2)
                                        {
                                                col_cur++;
                                        }
                                }
                                else
                                {
                                        str_len = 1;
                                }

                                col_cur++;
                                offset += str_len;

                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch == KEY_HOME || ch == KEY_UP)
                {
                        if (offset > 0)
                        {
                                offset = 0;
                                col_cur = col + str_length(prompt, 1);

                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch == KEY_END || ch == KEY_DOWN)
                {
                        if (offset < len)
                        {
                                offset = len;
                                col_cur = col + str_length(prompt, 1) + display_len;

                                moveto(row, col_cur);
                                iflush();
                        }
                        continue;
                }
                else if (ch > 255 || iscntrl(ch))
                {
                        continue;
                }
                else if ((ch & 0xff80) == 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
                                {
                                        log_debug("Ignore %d bytes of incomplete UTF8 character", str_len);
                                        str_len = 0;
                                        break;
                                }
                        }
                        input_str[str_len] = '\0';

                        if (str_len == 0) // Incomplete input
                        {
                                continue;
                        }

                        if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
                        {
                                log_error("mbstowcs() error");
                        }
                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));

                        if (len + str_len > buf_size - 1 ||
                                display_len + wc_len > max_display_len) // No enough space for Chinese character
                        {
                                outc('\a');
                                iflush();
                                continue;
                        }

                        memmove(buffer + offset + str_len, buffer + offset, (size_t)(len - offset));
                        memcpy(buffer + offset, input_str, (size_t)str_len);
                        len += str_len;
                        buffer[len] = '\0';
                        display_len += wc_len;

                        moveto(row, col_cur);
                        prints("%s", buffer + offset);
                        prints("%*s", max_display_len - display_len, "");

                        col_cur += wc_len;

                        moveto(row, col_cur);
                        iflush();

                        offset += str_len;
                }
                else if (ch >= 32 && ch < 127) // Printable character
                {
                        if (len + 1 > buf_size - 1 || display_len + 1 > max_display_len)
                        {
                                outc('\a');
                                iflush();
                                continue;
                        }

                        memmove(buffer + offset + 1, buffer + offset, (size_t)(len - offset));
                        buffer[offset] = (char)ch;
                        len++;
                        buffer[len] = '\0';
                        display_len++;

                        moveto(row, col_cur);
                        prints("%s", buffer + offset);
                        prints("%*s", max_display_len - display_len, "");

                        col_cur++;

                        moveto(row, col_cur);
                        iflush();

                        offset++;
                }
                else // Invalid character
                {
                        continue;
                }
        }

        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;
        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;

        clrline(output_current_row, SCREEN_ROWS);

        // update msg_ext with extended key handler
        if (key_handler(&ch, &ctx) != 0)
        {
                return ch;
        }

        loop = 1;
        while (!SYS_server_exit && loop)
        {
                if (eof_exit > 0 && line_current >= display_line_total)
                {
                        if (eof_exit == 1)
                        {
                                ch = press_any_key();
                        }
                        else // if (eof_exit == 2)
                        {
                                iflush();
                        }

                        loop = 0;
                        break;
                }

                if (line_current >= display_line_total || output_current_row > output_end_row)
                {
                        ctx.reach_begin = (line_current < output_current_row ? 1 : 0);

                        if (line_current - (output_current_row - screen_begin_row) + screen_row_total < display_line_total)
                        {
                                percentile = (line_current - (output_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 - (output_current_row - screen_begin_row) + 1;
                        ctx.line_bottom = MIN(line_current - (output_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, 1);
                        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(BBS_max_user_idle_time);
                                input_ok = 1;

                                if (ch != KEY_NULL && ch != KEY_TIMEOUT)
                                {
                                        BBS_last_access_tm = time(NULL);

                                        // Refresh current action
                                        if (user_online_update(NULL) < 0)
                                        {
                                                log_error("user_online_update(NULL) error");
                                        }
                                }

                                // extended key handler
                                if (key_handler(&ch, &ctx) != 0)
                                {
                                        goto cleanup;
                                }

                                switch (ch)
                                {
                                case KEY_NULL:
                                        log_debug("KEY_NULL");
                                        goto cleanup;
                                case KEY_TIMEOUT:
                                        log_debug("User input timeout");
                                        goto cleanup;
                                case KEY_HOME:
                                        if (line_current - output_current_row < 0) // Reach begin
                                        {
                                                break;
                                        }
                                        line_current = 0;
                                        output_current_row = screen_begin_row;
                                        output_end_row = SCREEN_ROWS - 1;
                                        clrline(output_current_row, SCREEN_ROWS);
                                        break;
                                case KEY_END:
                                        if (display_line_total < screen_row_total)
                                        {
                                                break;
                                        }
                                        line_current = display_line_total - screen_row_total;
                                        output_current_row = screen_begin_row;
                                        output_end_row = SCREEN_ROWS - 1;
                                        clrline(output_current_row, SCREEN_ROWS);
                                        break;
                                case KEY_UP:
                                        if (line_current - output_current_row < 0) // Reach begin
                                        {
                                                break;
                                        }
                                        line_current -= output_current_row;
                                        output_current_row = screen_begin_row;
                                        // screen_end_line = screen_begin_line;
                                        // prints("\033[T"); // Scroll down 1 line
                                        output_end_row = SCREEN_ROWS - 1; // Legacy Fterm only works with this line
                                        break;
                                case CR:
                                case KEY_DOWN:
                                        if (line_current + (screen_row_total - (output_current_row - screen_begin_row)) >= display_line_total) // Reach end
                                        {
                                                break;
                                        }
                                        line_current += (screen_row_total - (output_current_row - screen_begin_row));
                                        output_current_row = screen_row_total;
                                        output_end_row = SCREEN_ROWS - 1;
                                        moveto(SCREEN_ROWS, 0);
                                        clrtoeol();
                                        // prints("\033[S"); // Scroll up 1 line
                                        prints("\n"); // Legacy Cterm only works with this line
                                        break;
                                case KEY_PGUP:
                                        if (line_current - output_current_row < 0) // Reach begin
                                        {
                                                break;
                                        }
                                        line_current -= ((screen_row_total - 1) + (output_current_row - screen_begin_row));
                                        if (line_current < 0)
                                        {
                                                line_current = 0;
                                        }
                                        output_current_row = screen_begin_row;
                                        output_end_row = SCREEN_ROWS - 1;
                                        clrline(output_current_row, SCREEN_ROWS);
                                        break;
                                case KEY_SPACE:
                                case KEY_PGDN:
                                        if (line_current + screen_row_total - (output_current_row - screen_begin_row) >= display_line_total) // Reach end
                                        {
                                                break;
                                        }
                                        line_current += (screen_row_total - 1) - (output_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;
                                        }
                                        output_current_row = screen_begin_row;
                                        output_end_row = SCREEN_ROWS - 1;
                                        clrline(output_current_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 -= (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;
                                default:
                                        input_ok = 0;
                                        break;
                                }
                        }

                        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 ",
                                          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 ",
                                          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(output_current_row, 0);
                clrtoeol();
                prints("%s", buffer);
                line_current++;
                output_current_row++;
        }

cleanup:
        return ch;
}

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 0;
}

int display_file(const char *filename, int eof_exit)
{
        int ret;
        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", filename);
                return KEY_NULL;
        }

        if (user_online_update("VIEW_FILE") < 0)
        {
                log_error("user_online_update(VIEW_FILE) error");
        }

        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", filename);
        }

        return ret;
}

int show_top(const char *str_left, const char *str_middle, const char *str_right)
{
        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 / 2, &eol, &str_left_len, 1);
        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 / 2, &eol, &str_middle_len, 1);
        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 / 2, &eol, &str_right_len, 1);
        str_right_f[len] = '\0';

        moveto(1, 0);
        clrtoeol();
        prints("\033[1;44;33m%s\033[37m%*s%s\033[33m%*s%s\033[m",
                   str_left_f, 44 - str_left_len - str_middle_len, "",
                   str_middle_f, 36 - str_right_len, "", str_right_f);

        return 0;
}

int show_bottom(const char *msg)
{
        char str_time[LINE_BUFFER_LEN];
        int len_str_time;
        time_t time_online;
        struct tm *tm_online;
        char msg_f[LINE_BUFFER_LEN];
        int eol;
        int len_msg;
        int len;
        int len_username;
        char str_tm_online[LINE_BUFFER_LEN];
        int len_str_tm_online;

        len_str_time = (int)get_time_str(str_time, sizeof(str_time));

        msg_f[0] = '\0';
        len_msg = 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, &len_msg, 1);
                msg_f[len] = '\0';
        }

        len_username = (int)strnlen(BBS_username, sizeof(BBS_username));

        time_online = time(NULL) - BBS_login_tm;
        tm_online = gmtime(&time_online);
        if (tm_online->tm_mday > 1)
        {
                snprintf(str_tm_online, sizeof(str_tm_online),
                                 "\033[36m%d\033[33md \033[36m%d\033[33m:\033[36m%.2d",
                                 tm_online->tm_mday - 1, tm_online->tm_hour, tm_online->tm_min);
        }
        else
        {
                snprintf(str_tm_online, sizeof(str_tm_online),
                                 "\033[36m%d\033[33m:\033[36m%.2d",
                                 tm_online->tm_hour, tm_online->tm_min);
        }
        len_str_tm_online = str_length(str_tm_online, 1);

        moveto(SCREEN_ROWS, 0);
        clrtoeol();
        prints("\033[1;44;33m时间[\033[36m%s\033[33m]%s%*s \033[33m用户[\033[36m%s\033[33m][%s\033[33m]\033[m",
                   str_time, msg_f, 65 - len_str_time - len_msg - len_username - len_str_tm_online,
                   "", BBS_username, str_tm_online);

        return 0;
}

int show_active_board()
{
        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", DATA_ACTIVE_BOARD);
                        return KEY_NULL;
                }
        }

        if (time(NULL) - t_last_show >= 10)
        {
                line_last = line_current;
                t_last_show = time(NULL);
        }
        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 ",
                                          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 0;
}
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