Date: Sun, 24 Sep 2000 15:47:40 +1100 From: "Jan Mikkelsen" <janm@transactionsite.com> To: "BSD" <bsd@shell-server.com> Cc: <stable@FreeBSD.ORG> Subject: Re: Constant panics on 4.1-STABLE! Message-ID: <002101c025e2$92868560$0901a8c0@haym.transactionsite.com>
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BSD <bsd@shell-server.com> wrote:
>On Wed, 20 Sep 2000, Michael Allman wrote:
>> 132 /*
>> 133 * Look up the address in the table for that Address Family
>> 134 */
>> 135 if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) &&
>> 136 ((rn->rn_flags & RNF_ROOT) == 0)) {
>
> C doesn't guarantee order of execution in if ( bleh && bleh &&
>bleh). It may very well evaluate it backwards, or from the inside out if
>it wants. No?
No. The fact that the expression is used in an if statement doesn't change
the order in which the expression is evalutated. The && operator groups
left to right, and the second operand is not evalutated if the first is
false.
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