Date: Tue, 10 Oct 1995 15:01:35 -0400 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Terry Lambert <terry@lambert.org> Cc: wollman@lcs.mit.edu (Garrett A. Wollman), ache@astral.msk.su, Kai.Vorma@hut.fi, current@freebsd.org Subject: Re: tail dumps core Message-ID: <9510101901.AA10410@halloran-eldar.lcs.mit.edu> In-Reply-To: <199510101836.LAA10827@phaeton.artisoft.com> References: <9510101735.AA10192@halloran-eldar.lcs.mit.edu> <199510101836.LAA10827@phaeton.artisoft.com>
next in thread | previous in thread | raw e-mail | index | archive | help
<<On Tue, 10 Oct 1995 11:36:34 -0700 (MST), Terry Lambert <terry@lambert.org> said:
>> Neither of these are portable unless the array being cleared is
>> composed of characters. There is almost never any reason to use
>> calloc(3).
> I don't understand where you see a non-portability. Can you please
> explain? Thanks.
#include <stdio.h>
#include <string.h>
int
main(void) {
foo *p;
double d;
int i;
memset(&p, 0, sizeof p);
if (p == 0) {
printf("an all-bits-zero foo * compares equal to NULL\n");
} else {
printf("an all-bits-zero foo * compares different to NULL\n):
}
memset(&d, 0, sizeof d);
if (d == 0) {
printf("an all-bits-zero double compares equal to 0\n");
} else {
printf("an all-bits-zero double compares different to 0\n");
}
memset(&i, 0, sizeof i);
if (i == 0) {
printf("your machine is normal\n");
} else {
printf("your machine is really weird, but allowed by the"
" C standard\n");
}
return 0;
}
-GAWollman
--
Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ...
wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence. We like people
MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9510101901.AA10410>