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Message-ID: <20230224180018.7d58ea44@inria.fr>
Date: Fri, 24 Feb 2023 18:00:18 +0100
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Tamir Duberstein <tamird@...gle.com>
Cc: musl@...ts.openwall.com, NRK <nrk@...root.org>, Rich Felker
<dalias@...c.org>
Subject: Re: undefined behavior in fread.c
Tamir,
on Fri, 24 Feb 2023 11:42:30 -0500 you (Tamir Duberstein
<tamird@...gle.com>) wrote:
> Internal UB means "applying zero offset to null pointer" when the
> caller passes (NULL, _, 0, _).
So you mean internal misbehavior?
> Does such an attribute exist?
Yes, gcc has the nonnull old-style attribute, and I think that the C23
versions of gcc and clang will have something like `[[gnu::nonnull]]`.
Having this as attribute of the function and not of the pointer is a
bit unfortunate. For non-void pointers you could also use the `[static
1]` array parameter notation instead of a pointer.
Jₑₙₛ
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