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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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