From 2b3c3a85ec8aa8b4b94c0e594c32449dd70b4d26 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john.hawthorn@gmail.com>
Date: Sat, 21 May 2016 14:56:03 -0700
Subject: Move sources into src directory

---
 src/tty.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 src/tty.c

(limited to 'src/tty.c')

diff --git a/src/tty.c b/src/tty.c
new file mode 100644
index 0000000..bf2bc83
--- /dev/null
+++ b/src/tty.c
@@ -0,0 +1,142 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+#include "tty.h"
+
+void tty_reset(tty_t *tty) {
+	tcsetattr(tty->fdin, TCSANOW, &tty->original_termios);
+}
+
+void tty_close(tty_t *tty) {
+	tty_reset(tty);
+	fclose(tty->fout);
+	close(tty->fdin);
+}
+
+void tty_init(tty_t *tty, const char *tty_filename) {
+	tty->fdin = open(tty_filename, O_RDONLY);
+	if (tty->fdin < 0) {
+		perror("Failed to open tty");
+		exit(EXIT_FAILURE);
+	}
+
+	tty->fout = fopen(tty_filename, "w");
+	if (!tty->fout) {
+		perror("Failed to open tty");
+		exit(EXIT_FAILURE);
+	}
+
+	if (setvbuf(tty->fout, NULL, _IOFBF, 4096)) {
+		perror("setvbuf");
+		exit(EXIT_FAILURE);
+	}
+
+	if (tcgetattr(tty->fdin, &tty->original_termios)) {
+		perror("tcgetattr");
+		exit(EXIT_FAILURE);
+	}
+
+	struct termios new_termios = tty->original_termios;
+
+	/*
+	 * Disable all of
+	 * ICANON  Canonical input (erase and kill processing).
+	 * ECHO    Echo.
+	 * ISIG    Signals from control characters
+	 * ICRNL   Conversion of CR characters into NL
+	 */
+	new_termios.c_iflag &= ~(ICRNL);
+	new_termios.c_lflag &= ~(ICANON | ECHO | ISIG);
+
+	if (tcsetattr(tty->fdin, TCSANOW, &new_termios))
+		perror("tcsetattr");
+
+	tty_getwinsz(tty);
+
+	tty_setnormal(tty);
+}
+
+void tty_getwinsz(tty_t *tty) {
+	struct winsize ws;
+	if (ioctl(fileno(tty->fout), TIOCGWINSZ, &ws) == -1) {
+		tty->maxwidth = 80;
+		tty->maxheight = 25;
+	} else {
+		tty->maxwidth = ws.ws_col;
+		tty->maxheight = ws.ws_row;
+	}
+}
+
+char tty_getchar(tty_t *tty) {
+	char ch;
+	int size = read(tty->fdin, &ch, 1);
+	if (size < 0) {
+		perror("error reading from tty");
+		exit(EXIT_FAILURE);
+	} else if (size == 0) {
+		/* EOF */
+		exit(EXIT_FAILURE);
+	} else {
+		return ch;
+	}
+}
+
+static void tty_sgr(tty_t *tty, int code) {
+	tty_printf(tty, "%c%c%im", 0x1b, '[', code);
+}
+
+void tty_setfg(tty_t *tty, int fg) {
+	if (tty->fgcolor != fg) {
+		tty_sgr(tty, 30 + fg);
+		tty->fgcolor = fg;
+	}
+}
+
+void tty_setinvert(tty_t *tty) {
+	tty_sgr(tty, 7);
+}
+
+void tty_setnormal(tty_t *tty) {
+	tty_sgr(tty, 0);
+	tty->fgcolor = 9;
+}
+
+void tty_newline(tty_t *tty) {
+	tty_printf(tty, "%c%cK\n", 0x1b, '[');
+}
+
+void tty_clearline(tty_t *tty) {
+	tty_printf(tty, "%c%cK", 0x1b, '[');
+}
+
+void tty_setcol(tty_t *tty, int col) {
+	tty_printf(tty, "%c%c%iG", 0x1b, '[', col + 1);
+}
+
+void tty_moveup(tty_t *tty, int i) {
+	tty_printf(tty, "%c%c%iA", 0x1b, '[', i);
+}
+
+void tty_printf(tty_t *tty, const char *fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	vfprintf(tty->fout, fmt, args);
+	va_end(args);
+}
+
+void tty_flush(tty_t *tty) {
+	fflush(tty->fout);
+}
+
+size_t tty_getwidth(tty_t *tty) {
+	return tty->maxwidth;
+}
+
+size_t tty_getheight(tty_t *tty) {
+	return tty->maxheight;
+}
-- 
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