From 016d38f42584cf2e54de279e4948a9168028aff2 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sun, 29 May 2022 16:37:06 -0700
Subject: Tweak con script to do CRLF translation on received stream.

---
 tool/con.c | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

(limited to 'tool/con.c')

diff --git a/tool/con.c b/tool/con.c
index 8522786..92014e5 100644
--- a/tool/con.c
+++ b/tool/con.c
@@ -1,4 +1,5 @@
 /* con device */
+/* vim: set noexpandtab sw=8 : */
 
 #include <signal.h>
 #include <stdio.h>
@@ -14,24 +15,27 @@ void
 host(int fd)
 {
 	int cc;
-	char buf[128];
+	char buf;
+#ifndef HEX
+	char last = '\r';
+#endif
 
 	for (;;) {
-		cc = read(fd, buf, sizeof buf);
-#ifdef HEX
+		cc = read(fd, &buf, 1);
 		if (cc < 0)
 			break;
-		for (int i = 0; i < cc; ++i) {
+		if (cc) {
+#ifdef HEX
 			char hex[3];
-			sprintf(hex, "%02X", (unsigned char) buf[i]);
+			sprintf(hex, "%02X", (unsigned char) buf);
 			write(1, hex, 2);
-		}
 #else
-		if (cc > 0)
-			write(1, buf, cc);
-		else if (cc < 0)
-			break;
+			if (buf == '\n' && last != '\r')
+				write(1, "\r", 1);
+			write(1, &buf, 1);
+			last = buf;
 #endif
+		}
 	}
 }
 
@@ -57,6 +61,15 @@ user(int fd)
 				if (c == '.')
 					return;
 			}
+#ifdef HEX
+			char hex[5];
+			sprintf(hex, "<%02X>", (unsigned char) c);
+			write(1, hex, 4);
+#endif
+#ifdef SEND_CRLF
+			if (c == '\n' && last != '\r')
+				write(fd, "\r", 1);
+#endif
 			write(fd, &c, 1);
 			last = c;
 		}
-- 
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