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Message-ID: <ZkB1pX8wTRe-4lhV@album.bayer.uni.cx>
Date: Sun, 12 May 2024 09:54:13 +0200
From: Petr Pisar <petr.pisar@...as.cz>
To: musl@...ts.openwall.com
Subject: Re: strptime(s, "%Y-%j", &tm) does not update month and day
V Sat, May 11, 2024 at 05:28:54PM -0400, Rich Felker napsal(a):
> On Sat, May 11, 2024 at 05:24:59PM +0200, Petr Pisar wrote:
> > Hello,
> >
> > When debugging a libisds test failure with musl-1.2.5
> > <https://bugs.gentoo.org/show_bug.cgi?id=928107>, I found that musl's
> > strptime() does not handle "%Y-%j" properly. It accepts the format, it parses
> > the input string, it returns a correct pointer past the input string, but it
> > does not update tm.tm_mon and tm.tm_mday fileds of the third argument.
>
> This is behaving as specified. Previously, the behavior was
> unspecified. POSIX has amended it for future issues as the resolution
> of https://austingroupbugs.net/view.php?id=1727 to read:
>
> The tm_yday member of the tm structure pointed to by tm shall be
> set to this number minus 1.
>
> strptime generally does not behave like mktime, doing
> normalizations/conversions.
>
I see. I thought that strptime() does the normalization. Reading
mktime() specification reveals it has a side effect of normalizing tm_yday
from tm_year, tm_mon, and tm_mday.
However, I need the oposite and I cannot find any standard library function
for that. I will probaly resort to my own implementation with the drawback
of assumption that rules for leap years in Gregorian calendar won't change.
-- Petr
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