From 91195d34e1f71246cadc41705004d66ab647087e Mon Sep 17 00:00:00 2001
From: cflip <cflip@cflip.net>
Date: Sun, 8 Jan 2023 14:15:01 -0700
Subject: Initial import of existing source code

This is based off of snaptoken's "Build Your Own Text Editor" tutorial
at https://viewsourcecode.org/snaptoken/kilo/.
---
 terminal.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 terminal.c

(limited to 'terminal.c')

diff --git a/terminal.c b/terminal.c
new file mode 100644
index 0000000..c24f46d
--- /dev/null
+++ b/terminal.c
@@ -0,0 +1,84 @@
+#include "terminal.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <unistd.h>
+
+static struct termios original_termios;
+
+void die(const char* message)
+{
+	/* Clear the screen */
+	write(STDOUT_FILENO, "\x1b[2J", 4);
+	write(STDOUT_FILENO, "\x1b[H", 3);
+
+	perror(message);
+	exit(1);
+}
+
+void disable_raw_mode()
+{
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &original_termios) == -1)
+		die("tcsetattr");
+}
+
+/* Disables any input and output processing from the terminal */
+void enable_raw_mode()
+{
+	if (tcgetattr(STDIN_FILENO, &original_termios) == -1)
+		die("tcgetattr");
+
+	atexit(disable_raw_mode);
+
+	struct termios raw = original_termios;
+	raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+	raw.c_oflag &= ~(OPOST);
+	raw.c_cflag |= (CS8);
+	raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+
+	raw.c_cc[VMIN] = 0;
+	raw.c_cc[VTIME] = 1;
+
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
+		die("tcsetattr");
+}
+
+int get_cursor_position(int* rows, int* cols)
+{
+	char buffer[32];
+	unsigned int i = 0;
+
+	if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
+		return -1;
+
+	while (i < sizeof(buffer) - 1) {
+		if (read(STDIN_FILENO, &buffer[i], 1) != 1) break;
+		if (buffer[i] == 'R') break;
+		i++;
+	}
+	buffer[i] = '\0';
+
+	printf("\r\n&buffer[1]: '%s'\r\n", &buffer[1]);
+
+	if (buffer[0] != '\x1b' || buffer[1] != '[') return -1;
+	if (sscanf(&buffer[2], "%d;%d", rows, cols) != 2) return -1;
+
+	return 0;
+}
+
+int get_window_size(int* rows, int* cols)
+{
+	struct winsize size;
+
+	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) == -1 || size.ws_col == 0) {
+		if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
+			return -1;
+		return get_cursor_position(rows, cols);
+	} else {
+		*cols = size.ws_col;
+		*rows = size.ws_row;
+		return 0;
+	}
+}
-- 
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