Date: Thu, 27 Aug 1998 09:50:13 -0700 From: John Polstra <jdp@polstra.com> To: Bruce Evans <bde@zeta.org.au> Cc: dmm125@bellatlantic.net, bugs@FreeBSD.ORG Subject: Re: error in libcompat (2.2.7) Message-ID: <199808271650.JAA12805@austin.polstra.com> In-Reply-To: Your message of "Thu, 27 Aug 1998 17:57:23 %2B1000." <199808270757.RAA07536@godzilla.zeta.org.au>
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> >True, that's a bug. I don't think it has any actual effect, since
> >the function definition has the old pre-ANSI form:
> >
> > key_t
> > ftok(path, id)
> > const char *path;
> > char id;
> >
> >which means that "id" is assumed to be passed as an int, even though
> >only the low-order byte of it is used. But it should be fixed.
>
> Not a bug. The prototype must declare the arg as an int to match the
> old-style-but-still-ANSI definition. The definition uses char for
> historical reasons. Changing it would be incompatible. See rev.1.4
> of ftok.3 for some notes about this.
I don't agree. If the prototype says it's an int, then it should be
declared as int in the definition too. The definition should look
like this:
key_t
ftok(path, id)
const char *path;
int id;
{
struct stat st;
if (stat(path, &st) < 0)
return (key_t)-1;
return (key_t) ((char)id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xffff));
}
Here, I changed the type of "id" to int, and added a (char) cast in
front of its only use.
John
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