Date: Sat, 29 Jul 2000 11:51:53 +0100 From: Mark Ovens <marko@freebsd.org> To: hackers@freebsd.org Subject: ANSI compliance, gcc(1) and FreeBSD Message-ID: <20000729115153.C236@parish>
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Apologies if this is the wrong list for this question but it seems the
best place to get a *definitive* answer.
In the ANSI Standard (K&R 2e, A7.14 & A7.15) it states that, in the
case of the ``&&'' operator, the right operand is evaluated only if
the left operand evaluates to non-zero, and, for ``||'', the right
operand is evaluated only if the left operand evaluates to zero.
My questions are: does gcc(1) honour this, and is it permitted to rely
on this behaviour in FreeBSD (base system)?, e.g., would the following
be acceptable if we wanted to guarantee that foobar was set to BAR
*only* if FOO was unset or NULL?
char *foobar;
if ((foobar = getenv("FOO")) != NULL || (foobar = getenv("BAR")) != NULL)
I couldn't find the answer in style(9).
Please Cc: me as I'm not subscribed to -hackers.
TIA
--
If I buy a copy of WinDelete, and it doesn't delete Windows,
am I entitled to my money back?
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