bluelib/term/sys/linux/print.c

#include "../../print.h"

#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>

int z__b_stream_is_tty(FILE *fp)
{
	return isatty(fileno(fp));
}

int z__b_stream_dimensions(FILE *fp, unsigned int *w, unsigned int *h)
{
	if (!isatty(fileno(fp))) {
		return -1;
	}

	struct winsize ws;
	if (ioctl(fileno(fp), TIOCGWINSZ, &ws) == -1) {
		return -1;
	}

	if (w) {
		*w = ws.ws_col;
	}

	if (h) {
		*h = ws.ws_row;
	}

	return 0;
}

int z__b_stream_cursorpos(FILE *in, FILE *out, unsigned int *x, unsigned int *y)
{
	if (!isatty(fileno(in)) || !isatty(fileno(out))) {
		return -1;
	}

	struct termios term, restore;

	tcgetattr(fileno(in), &term);
	tcgetattr(fileno(in), &restore);
	term.c_lflag &= ~(ICANON | ECHO);
	tcsetattr(fileno(in), TCSANOW, &term);

	const char *cmd = "\033[6n";
	write(fileno(out), cmd, strlen(cmd));

	char buf[64];
	read(fileno(in), buf, sizeof buf);

	tcsetattr(fileno(in), TCSANOW, &restore);

	unsigned int row, col;
	int r = sscanf(buf, "\033[%u;%uR", &row, &col);
	if (r != 2) {
		return -1;
	}

	*x = col - 1;
	*y = row - 1;

	return 0;
}

int z__b_stream_set_modifier(FILE *fp, enum z__b_stream_modifier mod)
{
	char buf[128];
	int buf_i = 0;
	int nr_codes = 0;

	buf[buf_i++] = '\033';
	buf[buf_i++] = '[';

	if (mod & Z__B_STREAM_MOD_RESET) {
		buf[buf_i++] = '0';
		buf[buf_i++] = 'm';
		buf[buf_i++] = '\0';
		fputs(buf, fp);

		return 0;
	}

	if (mod & Z__B_STREAM_MOD_BOLD) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		buf[buf_i++] = '1';
		nr_codes++;
	}

	if (mod & Z__B_STREAM_MOD_ITALIC) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		buf[buf_i++] = '3';
		nr_codes++;
	}

	if (mod & Z__B_STREAM_MOD_ULINE) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		buf[buf_i++] = '4';
		nr_codes++;
	}

	if (mod & Z__B_STREAM_MOD_INVERT) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		buf[buf_i++] = '7';
		nr_codes++;
	}

	if (Z__B_STREAM_MOD_GET_FG_COLOUR(mod) != 0) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		buf[buf_i++] = mod & Z__B_STREAM_MOD_BRIGHT ? '9' : '3';
	}

	switch (Z__B_STREAM_MOD_GET_FG_COLOUR(mod)) {
	case Z__B_STREAM_MOD_BLACK:
		buf[buf_i++] = '0';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_RED:
		buf[buf_i++] = '1';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_GREEN:
		buf[buf_i++] = '2';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BLUE:
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_RED | Z__B_STREAM_MOD_GREEN:
		buf[buf_i++] = '3';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_RED | Z__B_STREAM_MOD_BLUE:
		buf[buf_i++] = '5';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_GREEN | Z__B_STREAM_MOD_BLUE:
		buf[buf_i++] = '6';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_RED | Z__B_STREAM_MOD_GREEN | Z__B_STREAM_MOD_BLUE:
		buf[buf_i++] = '7';
		nr_codes++;
		break;
	default:
		break;
	}

	if (Z__B_STREAM_MOD_GET_BG_COLOUR(mod) != 0) {
		if (nr_codes > 0) {
			buf[buf_i++] = ';';
		}

		if (mod & Z__B_STREAM_MOD_BG_BRIGHT) {
			buf[buf_i++] = '1';
			buf[buf_i++] = '0';
		} else {
			buf[buf_i++] = '9';
		}
	}

	switch (Z__B_STREAM_MOD_GET_BG_COLOUR(mod)) {
	case Z__B_STREAM_MOD_BG_BLACK:
		buf[buf_i++] = '0';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_RED:
		buf[buf_i++] = '1';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_GREEN:
		buf[buf_i++] = '2';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_BLUE:
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_RED | Z__B_STREAM_MOD_BG_GREEN:
		buf[buf_i++] = '3';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_RED | Z__B_STREAM_MOD_BG_BLUE:
		buf[buf_i++] = '5';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_GREEN | Z__B_STREAM_MOD_BG_BLUE:
		buf[buf_i++] = '6';
		nr_codes++;
		break;
	case Z__B_STREAM_MOD_BG_RED | Z__B_STREAM_MOD_BG_GREEN
		| Z__B_STREAM_MOD_BG_BLUE:
		buf[buf_i++] = '7';
		nr_codes++;
		break;
	default:
		break;
	}

	buf[buf_i++] = 'm';
	buf[buf_i++] = '\0';
	fputs(buf, fp);

	return 0;
}