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Date: Tue, 13 Jul 1999 03:50:02 -0700 (PDT)
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From: Sheldon Hearn <sheldonh@uunet.co.za>
Subject: Re: bin/12611: /usr/bin/jot crashes with floating point exception 
Reply-To: Sheldon Hearn <sheldonh@uunet.co.za>
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The following reply was made to PR bin/12611; it has been noted by GNATS.

From: Sheldon Hearn <sheldonh@uunet.co.za>
To: frodef@acm.org
Cc: freebsd-gnats-submit@freebsd.org
Subject: Re: bin/12611: /usr/bin/jot crashes with floating point exception 
Date: Tue, 13 Jul 1999 12:46:45 +0200

 On Mon, 12 Jul 1999 11:05:07 MST, frodef@acm.org wrote:
 
 > >How-To-Repeat:
 > % jot -r 1 -p 4294967296
 > zsh: floating point exception (core dumped)  jot -r 1 -p 4294967296
 
 It's not always reproducible because it relies on a random number, which
 might be small on any given run. However, when it does fail, I get the
 following:
 
 | (gdb) set args -r 1 -p 4294967296
 | (gdb) run
 | Starting program: /usr/bin/jot -r 1 -p 4294967296
 | 
 | Program received signal SIGFPE, Arithmetic exception.
 | 0x804918b in putdata (x=4058183150.1194973, notlast=0)
 |     at /usr/src/usr.bin/jot/jot.c:313
 | 313             long            d = x;
 | (gdb) back
 | #0  0x804918b in putdata (x=4058183150.1194973, notlast=0)
 |     at /usr/src/usr.bin/jot/jot.c:313
 | #1  0x804881e in main (argc=5, argv=0xbfbfd680)
 |     at /usr/src/usr.bin/jot/jot.c:106
 | #2  0x80486d1 in _start ()
 
 It looks like a simple assignment from a long to a double. Try the
 following patch.
 
 Ciao,
 Sheldon.
 
 Index: jot.c
 ===================================================================
 RCS file: /home/ncvs/src/usr.bin/jot/jot.c,v
 retrieving revision 1.9
 diff -u -d -r1.9 jot.c
 --- jot.c	1999/05/13 12:18:24	1.9
 +++ jot.c	1999/07/13 10:42:06
 @@ -310,8 +310,8 @@
  	double x;
  	long notlast;
  {
 -	long		d = x;
 -	register long	*dp = &d;
 +	double		d = x;
 +	register double	*dp = &d;
  
  	if (boring)				/* repeated word */
  		printf(format);
 


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