From 5d9b2527bc17daea3ec9eed74d80a76ec89e0f51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Wed, 14 Jul 2021 11:44:12 +0200
Subject: rtty.c: Ignore repetition of typed command

---
 rtty.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/rtty.c b/rtty.c
index 9118f79..42c9324 100644
--- a/rtty.c
+++ b/rtty.c
@@ -10,7 +10,7 @@
 int
 main()
 {
-	char bufin[MAXBUF], bufout[MAXBUF];
+	char bufin[MAXBUF], bufout[MAXBUF], *bi, *bo;
 	fd_set rfds0, rfds1;
 	int c, fdin, fdout, flags, i, nin, nout, state;
 	struct timeval tv;
@@ -31,15 +31,25 @@ main()
 		FD_SET(fdout, &rfds1);
 		if(select(fdout+1, &rfds1, NULL, NULL, &tv) > 0){
 			nout = read(fdout, bufout, MAXBUF);
+			if(!nout) continue;
 			bufout[nout] = 0;
 
 			/* Ignore repetition of typed command. */
-			if(strcmp(bufout, bufin) == 0)
-				bufin[0] = 0;
-			else{
-				printf("%s", bufout);
-				fflush(stdout);
+			for(bi = bufin, bo = bufout;;){
+				if(*bo == '\n')
+					break;
+				if(*bo == 13){
+					bo++;
+					continue;
+				}
+				if(*bi != *bo){
+					printf("%s", bufout);
+					fflush(stdout);
+					break;
+				}
+				bi++; bo++;
 			}
+			bufin[0] = 0;
 		}
 
 		/* Read from standard in and print on named pipe (in). */
-- 
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