From 99334c581349f27551f30082de9b0b8a7b9274af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Wed, 14 Jul 2021 10:23:03 +0200
Subject: rin.c: Improve

---
 rin.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 46 insertions(+), 20 deletions(-)

diff --git a/rin.c b/rin.c
index 72463d8..8d89bc6 100644
--- a/rin.c
+++ b/rin.c
@@ -1,34 +1,60 @@
+#include <curses.h>
 #include <err.h>
 #include <fcntl.h>
-#include <signal.h>
-#include <termios.h>
 #include <unistd.h>
+#include <sys/select.h>
 
 int
 main()
 {
-	int c, n, o, t;
-	struct termios orig, term;
+	fd_set rfds;
+	int c, in, n, out, startx, y;
+	struct timeval tv;
+	WINDOW *w;
 
-	t = 0;
+	w = initscr();
+	raw();
+	noecho();
+	timeout(1);
 
-	if((o = open("/var/tmp/r.in", O_RDWR)) == -1)
+	if((in = open("/var/tmp/r.in", O_RDWR)) == -1)
 		err(1, "/var/tmp/r.in");
+	if((out = open("/var/tmp/r.out", O_RDWR)) == -1)
+		err(1, "/var/tmp/r.out");
 
-        /* Enter "raw" terminal mode. */
-        tcgetattr(t, &orig);
-        tcgetattr(t, &term);
-        term.c_lflag &= ~(ICANON|ECHO|ISIG);
-        tcsetattr(t, TCSANOW, &term);
-
-	while((n = read(t, &c, 1)) > 0){
-		if(c == 26) /* ^Z */
-			break;
-		if(c != '\n')
-			write(t, &c, 1);
-		write(o, &c, 1);
+	tv.tv_sec = 0;
+	tv.tv_usec = 1;
+	FD_ZERO(&rfds);
+
+	startx = 0;
+
+	for(;;){
+		FD_SET(out, &rfds);
+		if(select(out+1, &rfds, NULL, NULL, &tv) > 0){
+			read(out, &c, 1);
+			printw("%c", c);
+
+			startx = -1;
+		}
+		if((c = getch()) != ERR){
+			if(startx == -1)
+				startx = getcurx(w);
+			if(c == 26) /* ^Z */
+				break;
+			if(c == 21){ /* ^U */
+move:				y = getcury(w);
+				move(y, startx);
+				continue;
+			}
+			if(c == '\n')
+				goto move;
+			else
+				printw("%c", c);
+			write(in, &c, 1);
+		}
 	}
 
-	/* Restore original terminal mode. */
-	tcsetattr(t, TCSANOW, &orig);
+	echo();
+	noraw();
+	endwin();
 }
-- 
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