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Date: Wed, 3 Jan 2001 23:12:58 +0000
From: Tony Finch <dot@dotat.at>
To: Bruce Evans <bde@zeta.org.au>
Cc: Matthew Jacob <mjacob@feral.com>,
	=?iso-8859-1?Q?G=E9rard_Roudier?= <groudier@club-internet.fr>,
	Peter Wemm <peter@netplex.com.au>, cvs-committers@FreeBSD.org,
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Subject: Re: cvs commit: src/sys/dev/isp isp.c
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References: <20010102133120.M47732@hand.dotat.at> <Pine.BSF.4.21.0101031929540.13047-100000@besplex.bde.org>
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Bruce Evans <bde@zeta.org.au> wrote:
>
>Actually, literal strings are arrays of plain chars.

Gah!

>Their non-modifyability is specified explicitly since it doesn't
>follow from const'ness.

Why doesn't it follow? The C standard uses pretty much the same
language to say that string literals and const objects shouldn't be
modified ("behaviour is undefined"). [I'm looking at the C99 draft.]

>Enforcement of const'ness is also optional.  The non-const'ness of the
>chars in literal strings gives implementors even more freedom.  E.g.:
>
>---
>void foo(char *);
>char *bar;
>...
>	foo(bar);			/* Diagnostic required. */
>	foo("string literal");		/* Diagnostic not required. */
>---

Was there supposed to be a const in there somewhere?

>Use `gcc -Wwrite-strings' if you don't want warnings for possibly
>modifying string literals.

Surely "... if you do want ..."?

Tony.
-- 
f.a.n.finch    fanf@covalent.net    dot@dotat.at
"Plan 9 deals with the resurrection of the dead."


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