133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/**
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* Copyright 2021 Johannes Marbach
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include "terminal.h"
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#include "../shared/log.h"
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#include <fcntl.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <linux/kd.h>
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#include <sys/ioctl.h>
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/**
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* Static variables
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*/
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static int current_fd = -1;
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static int original_mode = -1;
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static long original_kb_mode = -1;
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/**
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* Static prototypes
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*/
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/**
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* Close the current file descriptor and reopen /dev/tty0.
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*
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* @return true if opening was successful, false otherwise
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*/
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static bool reopen_current_terminal(void);
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/**
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* Close the current file descriptor.
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*/
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static void close_current_terminal(void);
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/**
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* Static functions
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*/
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static bool reopen_current_terminal(void) {
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close_current_terminal();
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current_fd = open("/dev/tty0", O_RDWR);
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if (current_fd < 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not open /dev/tty0");
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return false;
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}
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return true;
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}
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static void close_current_terminal(void) {
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if (current_fd < 0) {
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return;
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}
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close(current_fd);
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current_fd = -1;
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}
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/**
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* Public functions
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*/
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void ul_terminal_prepare_current_terminal(bool enable_graphics_mode, bool disable_keyboard_input) {
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/* Exit early if there is nothing to do */
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if (!enable_graphics_mode && !disable_keyboard_input) {
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return;
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}
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/* Reopen the current terminal */
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reopen_current_terminal();
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if (current_fd < 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not prepare current terminal");
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return;
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}
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/* Disable terminal keyboard input (hides entered text) */
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if (disable_keyboard_input) {
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if (ioctl(current_fd, KDGKBMODE, &original_kb_mode) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not get terminal keyboard mode");
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}
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if (ioctl(current_fd, KDSKBMODE, K_OFF) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not set terminal keyboard mode to off");
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}
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}
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/* Switch terminal into graphics mode (hides command prompt) */
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if (enable_graphics_mode) {
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if (ioctl(current_fd, KDGETMODE, &original_mode) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not get terminal mode");
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}
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if (ioctl(current_fd, KDSETMODE, KD_GRAPHICS) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not set terminal mode to graphics");
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}
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}
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}
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void ul_terminal_reset_current_terminal(void) {
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/* If we haven't previously opened the current terminal, exit */
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if (current_fd < 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not reset current terminal");
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return;
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}
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/* Reset terminal mode if needed */
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if (original_mode >= 0 && ioctl(current_fd, KDSETMODE, original_mode) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not reset terminal mode");
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}
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/* Reset terminal keyboard mode if needed */
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if (original_kb_mode >= 0 && ioctl(current_fd, KDSKBMODE, original_kb_mode) != 0) {
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bbx_log(BBX_LOG_LEVEL_WARNING, "Could not reset terminal keyboard mode");
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}
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close_current_terminal();
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}
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