Date: Tue, 31 Jul 2001 09:07:01 -0700 From: "David O'Brien" <obrien@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org, Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Subject: Re: cvs commit: src/usr.sbin/newsyslog Makefile newsyslog.c Message-ID: <20010731090701.A70277@dragon.nuxi.com> In-Reply-To: <XFMail.010731084518.jhb@FreeBSD.org>; from jhb@FreeBSD.org on Tue, Jul 31, 2001 at 08:45:18AM -0700 References: <20010730163112.A83693@dragon.nuxi.com> <XFMail.010731084518.jhb@FreeBSD.org>
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On Tue, Jul 31, 2001 at 08:45:18AM -0700, John Baldwin wrote:
> It only returns ULONG_MAX if the original value would overflow.
>
> strtoul() of '-4' will return -4:
Lets fix this program first:
#include <stdio.h>
#include <stdlib.h>
> const char *s = "-4";
>
> int
> main()
> {
> int x;
unsigned long x;
> x = strtoul(s, NULL, 0);
> printf("s = \"%s\", x = %d\n", s, x);
printf("s = \"%s\", x = %lu\n", s, x);
> return 0;
> }
> s = "-4", x = -4
Now you get the correct answer:
> Granted, when x is unsigned, you get:
>
> s = "-4", x = 4294967292
And unsigned *is* what the strtoul is defined to return. With you
assigning the return of strtoul() to something else, and printing it as
something else than %ul; all bets are off.
--
-- David (obrien@FreeBSD.org)
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