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Date: Thu, 31 May 2018 14:20:19 +0000
From: "Laurent Bercot" <ska-dietlibc@...rnet.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] scanf: handle the L modifier for integers

>Without this patch, ret will be 1 and mask will be 0. It is obviously
>incorrect. According to the man page, L should work like ll:
>
>L Indicates that the conversion will be either e, f, or g and the
>   next pointer is a pointer to long double or the conversion will
>   be d, i, o, u, or x and the next pointer is a pointer to long
>   long.

  This is a GNU extension. POSIX states that L is only valid before
a floating-point conversion specifier:

L
     Specifies that a following a, A, e, E, f, F, g, or G conversion 
specifier
     applies to an argument with type pointer to long double.

  from 
http://pubs.opengroup.org/onlinepubs/9699919799/functions/scanf.html

  So, it is valid for musl not to accept %Lx.
  Now, the argument that it's a good idea to align musl's behaviour to
glibc's whenever possible is a sensible one. But it's a decision for
the musl authors to make, and the pros and cons need to be carefully
balanced; musl's current behaviour is not _incorrect_.

--
  Laurent

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