Date: Tue, 08 Aug 2000 18:34:46 -0400 From: "Thomas M. Sommers" <tms2@mail.ptd.net> To: Alfred Perlstein <bright@wintelcom.net> Cc: Mark Ovens <marko@FreeBSD.ORG>, chat@FreeBSD.ORG Subject: Re: C time functions - problem Message-ID: <39908B06.D1238928@mail.ptd.net> References: <20000808201807.H250@parish> <20000808122832.I4854@fw.wintelcom.net>
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Alfred Perlstein wrote:
>
> * 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.
Or just use 0.
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