Added support for %s (sysname) %m (machine) %r (release) and %v (version)

prompt macros to agree with getty(8).

libexec/telnetd/utility.c

@@ -39,6 +39,7 @@ static char sccsid[] = "@(#)utility.c	8.2 (Berkeley) 12/15/93";
 
 #ifdef __FreeBSD__
 #include <locale.h>
+#include <sys/utsname.h>
 #endif
 #define PRINTOPTIONS
 #include "telnetd.h"
@@ -429,6 +430,12 @@ putf(cp, where)
 #else
 	extern char *rindex();
 #endif
+#ifdef __FreeBSD__
+	static struct utsname kerninfo;
+
+	if (!*kerninfo.sysname)
+		uname(&kerninfo);
+#endif
 
 	putlocation = where;
 
@@ -465,6 +472,24 @@ putf(cp, where)
 			putstr(db);
 			break;
 
+#ifdef __FreeBSD__
+		case 's':
+			putstr(kerninfo.sysname);
+			break;
+
+		case 'm':
+			putstr(kerninfo.machine);
+			break;
+
+		case 'r':
+			putstr(kerninfo.release);
+			break;
+
+		case 'v':
+			putstr(kerninfo.version);
+			break;
+#endif
+
 		case '%':
 			putchr('%');
 			break;