xurses/xurses.c

/*
 * Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
 *
 * Xurses is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
 * And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
 * It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
 */

#ifndef XURSES_SOURCE
#define XURSES_SOURCE

#include <xolatile/xurses.h>

int    curses_active        = 1;
int    curses_cursor        = 0;
char   curses_signal        = '\0';
int    curses_screen_width  = 0;
int    curses_screen_height = 0;
int    curses_screen_size   = 0;
char * curses_screen        = NULL;

void (* curses_action ['~' - ' ']) (void) = { 0 };

struct termios curses_old_terminal;
struct termios curses_new_terminal;

void curses_initialize (void) {
	char key;

	struct winsize screen_dimension;

	fatal_failure (ioctl (STDOUT_FILENO, TIOCGWINSZ, & screen_dimension) == -1, "[!] ioctl: Failed to get terminal size.");

	curses_screen_width  = (int) screen_dimension.ws_col;
	curses_screen_height = (int) screen_dimension.ws_row;

	fatal_failure (tcgetattr (STDIN_FILENO, & curses_old_terminal) == -1, "[!] tcgetattr: Failed to get terminal attributes.");

	curses_new_terminal = curses_old_terminal;

	curses_new_terminal.c_cc [VMIN]  = (unsigned char) 0;
	curses_new_terminal.c_cc [VTIME] = (unsigned char) 1;

	curses_new_terminal.c_iflag &= (unsigned int) ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
	curses_new_terminal.c_oflag &= (unsigned int) ~(OPOST);
	curses_new_terminal.c_cflag |= (unsigned int)  (CS8);
	curses_new_terminal.c_lflag &= (unsigned int) ~(ECHO | ICANON | IEXTEN | ISIG);

	fatal_failure (tcsetattr (STDIN_FILENO, TCSAFLUSH, & curses_new_terminal) == -1, "[!] tcsetattr: Failed to set raw terminal attributes.");

	curses_screen = allocate (12 * (curses_screen_width + 2) * curses_screen_height + 8);

	for (key = ' '; key != '~'; ++key) {
		curses_unbind (key);
	}
}

void curses_deinitialize (void) {
	curses_screen = deallocate (curses_screen);

	out ("\033[2J\033[H", 7);

	fatal_failure (tcsetattr (STDIN_FILENO, TCSAFLUSH, & curses_old_terminal) == -1, "[!] tcsetattr: Failed to set terminal attributes.");
}

void curses_synchronize (void) {
	curses_signal = '\0';

	out (curses_screen, curses_screen_size);

	in (& curses_signal, 1);

	curses_screen_size = 0;

	if ((curses_signal >= ' ') && (curses_signal <= '~')) {
		curses_action [curses_signal - ' '] ();
	}

	string_copy_limit (& curses_screen [curses_screen_size], "\033[H", 3);
	curses_screen_size += 3;
}

void curses_blank (void) {
	int i, j;

	for (i = 0; i != curses_screen_height; ++i) {
		for (j = 0; j != curses_screen_width; ++j) {
			curses_character (' ', EFFECT_NORMAL, COLOUR_WHITE, j, i);
		}
	}
}

void curses_character (char character, int effect, int colour, int x, int y) {
	char format [13] = "\033[ ;3 m \033[0m";

	format [2] = (char) effect + '0';
	format [5] = (char) colour + '0';
	format [7] = character;

	string_copy_limit (& curses_screen [(y * (curses_screen_width + 2) + x) * 12 + 3], format, 12);

	curses_screen_size += 12;
}

void curses_append_character (char character, int effect, int colour) {
	char format [13] = "\033[ ;3 m \033[0m";

	format [2] = (char) effect + '0';
	format [5] = (char) colour + '0';
	format [7] = character;

	string_copy_limit (& curses_screen [curses_screen_size], format, 12);

	curses_screen_size += 12;
}

void curses_append_string (char * string, int effect, int colour, int length) {
	char format [8] = "\033[ ;3 m";

	format [2] = (char) effect + '0';
	format [5] = (char) colour + '0';

	string_copy_limit (& curses_screen [curses_screen_size], format, 7);
	curses_screen_size += 7;
	string_copy_limit (& curses_screen [curses_screen_size], string, length);
	curses_screen_size += length;
	string_copy_limit (& curses_screen [curses_screen_size], "\033[0m", 4);
	curses_screen_size += 4;
}

void curses_append_cursor (int cursor_x, int cursor_y) {
	char format [11] = "\033[000;000H";

	format [4] = (char) (cursor_y /   1) % 10 + '0';
	format [3] = (char) (cursor_y /  10) % 10 + '0';
	format [2] = (char) (cursor_y / 100) % 10 + '0';
	format [8] = (char) (cursor_x /   1) % 10 + '0';
	format [7] = (char) (cursor_x /  10) % 10 + '0';
	format [6] = (char) (cursor_x / 100) % 10 + '0';

	string_copy_limit (& curses_screen [curses_screen_size], format, 10);
	curses_screen_size += 10;
}

void curses_style (int effect, int colour) {
	char format [8] = "\033[ ;3 m";

	if ((effect == -1) || (colour == -1)) {
		out ("\033[0m", 4);
	} else {
		format [2] = (char) effect + '0';
		format [5] = (char) colour + '0';

		out (format, 7);
	}
}

void curses_clear (void) {
	out ("\033[2J", 4);
}

void curses_show_cursor (int show) {
	if (show != 0) {
		out ("\033[?25h", 6);
	} else {
		out ("\033[?25l", 6);
	}
}

void curses_bind (char key, void (* action) (void)) {
	curses_action [key - ' '] = action;
}

void curses_unbind (char key) {
	curses_action [key - ' '] = curses_idle;
}

void curses_idle (void) {
	return;
}

void curses_exit (void) {
	curses_active = 0;
}

#endif