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Subject: Re: scanf and m modifier
To: cygwin@cygwin.com
References: <768145014.4380137.1467998182030.JavaMail.yahoo.ref@mail.yahoo.com> <768145014.4380137.1467998182030.JavaMail.yahoo@mail.yahoo.com> <fdf60e4f-656c-01a9-91ef-35cc5e496a78@cs.umass.edu>
From: Eric Blake <eblake@redhat.com>
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Date: Fri, 8 Jul 2016 11:42:40 -0600
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From: Eric Blake <eblake@redhat.com>
To: cygwin@cygwin.com
Message-ID: <577FE610.30204@redhat.com>
Subject: Re: scanf and m modifier
References: <768145014.4380137.1467998182030.JavaMail.yahoo.ref@mail.yahoo.com>
 <768145014.4380137.1467998182030.JavaMail.yahoo@mail.yahoo.com>
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On 07/08/2016 11:22 AM, Eliot Moss wrote:
> On 7/8/2016 1:16 PM, Owen Leibman wrote:
>> The m modifier is handled just fine by the compiler, but
>> the results of using it are different on Cygwin than on several other
>> systems
>> I've tried. Here is a sample program:
>=20
> Dear Owen -- The first question I'd ask is: What versions of gcc
> and C libraries are we talking about?  IIRC, the m feature is
> relatively new (relative being, umm, relative), so which gcc you're
> using, and the libraries, too, may matter.

scanf("%ms") is a POSIX extension, not required by C99.  I suspect the
answer is that no one has implemented it in newlib yet; patches welcome.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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