Date: Tue, 8 Aug 2000 12:28:32 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Mark Ovens <marko@FreeBSD.ORG> Cc: chat@FreeBSD.ORG Subject: Re: C time functions - problem Message-ID: <20000808122832.I4854@fw.wintelcom.net> In-Reply-To: <20000808201807.H250@parish>; from marko@FreeBSD.ORG on Tue, Aug 08, 2000 at 08:18:07PM %2B0100 References: <20000808201807.H250@parish>
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* Mark Ovens <marko@FreeBSD.ORG> [000808 12:21] wrote:
> Can anyone tell me why the call to localtime() in the code below
> should segfault in tzset()?
>
> Running it in the debugger shows that ``t'' is set to a sensible
> value.
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x280be4c8 in tzset () from /usr/lib/libc.so.4
>
>
> #include <stdio.h>
> #include <time.h>
>
> int main() {
> struct tm *timeptr;
> char buf[BUFSIZ];
> size_t size;
> time_t t;
>
> tzset;
>
> t = time((time_t *)0);
> timeptr = localtime((time_t *)t);
>
> .....
Please don't do disgusting things with casts.
Do not cast a time_t to a time_t *, they aren't the same.
Don't cast 0 to a pointer type, use NULL.
Remove the overzealous casting and your programming error should
become clear.
--
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."
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