diff to make caesar(1) to accept negative arguments

[Dieter Rauschenberger]

Hi,

the attached diff makes caesar(1) to accept negative arguments, so one
may type:

$ echo IBM | caesar -1 
HAL

$ echo HAL | caesar 1  
IBM

$ echo IBM | caesar -1 | caesar 1
IBM

Maybe this is more expected then just

$ echo IBM | caesar 25
HAL

Regards
  Dieter
Index: caesar.c
===================================================================
RCS file: /cvs/src/games/caesar/caesar.c,v
retrieving revision 1.13
diff -u -p -r1.13 caesar.c
--- caesar.c    9 Jul 2004 15:59:26 -0000       1.13
+++ caesar.c    25 Oct 2008 17:39:39 -0000
@@ -150,9 +150,12 @@ printit(int rot)
 {
        int ch;
 
-       if ((rot < 0) || ( rot >= 26))
+       if ((rot < -25) || ( rot >= 26))
                errx(1, "bad rotation value");
        
+       if ( rot < 0 )
+               rot += 26;
+
        while ((ch = getchar()) != EOF)
                putchar(ROTATE(ch, rot));
        exit(0);