https://www.bennee.com/~alex/2009-11-20T17:54:00+00:00the wanderings of a supposed digital native2009-11-20T17:54:00+00:002009-11-20T17:54:00+00:00alextag:www.bennee.com,2009-11-20:/~alex/blog/2009/11/20/would-you-accept-a-patch-like-this/

<p>Wow, I actually found something that netcat can't do.</p> <pre class="literal-block"> --- netcat-openbsd-1.89/netcat.c 2009-11-20 17:44:40.000000000 +0000 +++ netcat-openbsd-1.89.patched/netcat.c 2009-11-20 17:43:35.000000000 +0000 &#64;&#64; -74,6 +74,7 &#64;&#64; /* Command Line Options */ int Cflag = 0; /* CRLF line-ending */ +int cflag = 0; /* CR line-ending */ int dflag; /* detached …</pre>

<p>Wow, I actually found something that netcat can't do.</p> <pre class="literal-block"> --- netcat-openbsd-1.89/netcat.c 2009-11-20 17:44:40.000000000 +0000 +++ netcat-openbsd-1.89.patched/netcat.c 2009-11-20 17:43:35.000000000 +0000 &#64;&#64; -74,6 +74,7 &#64;&#64; /* Command Line Options */ int Cflag = 0; /* CRLF line-ending */ +int cflag = 0; /* CR line-ending */ int dflag; /* detached, no stdin */ int iflag; /* Interval Flag */ int jflag; /* use jumbo frames if we can */ &#64;&#64; -137,7 +138,7 &#64;&#64; sv = NULL; while ((ch = getopt(argc, argv, - &quot;46Ddhi:jklnP:p:rSs:tT:Uuvw:X:x:zC&quot;)) != -1) { + &quot;46Ddhi:jklnP:p:rSs:tT:Uuvw:X:x:zCc&quot;)) != -1) { switch (ch) { case '4': family = AF_INET; &#64;&#64; -230,6 +231,9 &#64;&#64; case 'C': Cflag = 1; break; + case 'c': + cflag = 1; + break; default: usage(1); } &#64;&#64; -748,6 +752,12 &#64;&#64; if (atomicio(vwrite, nfd, &quot;\r\n&quot;, 2) != 2) return; } + else if ((cflag) &amp;&amp; (buf[n-1]=='\n')) { + if (atomicio(vwrite, nfd, buf, n-1) != (n-1)) + return; + if (atomicio(vwrite, nfd, &quot;\r&quot;, 1) != 1) + return; + } else { if (atomicio(vwrite, nfd, buf, n) != n) return; </pre> <p>My dad has been experimenting with putting an old <a class="reference external" href="http://en.wikipedia.org/wiki/FLEX_%28operating_system%29">Flex</a> system on the net. I was having trouble talking to it with netcat. Using Telnet was a little better but still failing. It turns out some very old systems have different line termination sequences. I can now play the original <a class="reference external" href="http://en.wikipedia.org/wiki/Colossal_Cave_Adventure">Colossal Cave</a> :-)</p>