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Message-Id: <20220906141311.b8650027f3499c080f45b4fd@zhasha.com>
Date: Tue, 6 Sep 2022 14:13:11 +0200
From: Joakim Sindholt <opensource@...sha.com>
To: musl@...ts.openwall.com
Subject: Re: ecvt(0, 0, ...) is broken
On Tue, 6 Sep 2022 12:12:48 +0200, Gabriel Ravier <gabravier@...il.com> wrote:
> Executing ecvt(0, 0, &decpt, &sign) results in musl returning
> "000000000000000".
>
> This seems highly likely to be a bug considering that glibc returns ""
> and I see no plausible reasoning for musl's behavior that could be
> justified by the standard.
POSIX.1-2001 said:
> The ecvt() function shall convert value to a null-terminated string of
> ndigit digits (where ndigit is reduced to an unspecified limit
> determined by the precision of a double) and return a pointer to the
> string. The high-order digit shall be non-zero, unless the value is 0.
The first part would imply that ndigit=0 should return the string "" but
the second part makes no provision for a zero-digit-long string.
I would say ndigit=0 is UB.
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