Date: Mon, 17 Jul 2000 16:50:07 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/19994: sscanf() fails on 64-bit operations Message-ID: <200007172350.QAA80903@freefall.freebsd.org>
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The following reply was made to PR misc/19994; it has been noted by GNATS.
From: Bruce Evans <bde@zeta.org.au>
To: j_guojun@lbl.gov
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: misc/19994: sscanf() fails on 64-bit operations
Date: Tue, 18 Jul 2000 09:41:10 +1000 (EST)
On Mon, 17 Jul 2000, Jin Guojun wrote:
> >How-To-Repeat:
>
> main(argc, argv)
> {
> int rev, i = 1;
> if (!strcmp(argv[i], "-r")) {
> rev = 1;
> i++;
> } else rev = 0;
> {
> int64_t h;
> rev ? sscanf(argv[i], "%lld", &h) : sscanf(argv[i], "%llx", &h);
> printf(rev ? "0x%016llX\n": "%lld\n", h);
> }
> }
64-bit types are unportable. FreeBSD's scanf only supports reading "quad"
types using %qd format.
FreeBSD's scanf also has some overflow handling bugs from misusing strtoq
to handle non-quads.
Bruce
Bruce
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