RE: [avr-chat] Printf with leading zeros?

[Weddington, Eric]

Please open a bug report on the avr-libc project on Savannah, with a 
reproducible test case.

Thanks,
Eric

> -----Original Message-----
> From: address@hidden [mailto:avr-
> address@hidden On Behalf Of Rick Mann
> Sent: Tuesday, February 01, 2011 3:43 PM
> To: Andy Warner
> Cc: address@hidden
> Subject: Re: [avr-chat] Printf with leading zeros?
> 
> 
> Thanks for that, but I'm still seeing issues. Note that in my last email,
> I mentioned that the behavior I'm seeing is *with* the floating-point
> version of the library.
> 
> Moreover, the docs you quoted say "but only the # additional option can be
> specified," although I don't know what that means, exactly. It seems to
> say that "#" can be used, but other flags cannot (including width
> specifiers). However, later on the page, under "Notes," it says "For
> default version the width field and the "pad to left" ( symbol minus )
> option will work in this case," suggesting that the field width and pad-
> to-left flags work (in the case of floating point conversions, which
> render as question marks). This suggests that even in the default version
> of the library, field width specification should work.
> 
> None of that explains why some *values* result in different behavior.
> 
> Note that I don't mind losing the "#" flag, but that specifying zero-
> padding and field minimum width is required, and I don't get that with
> even the floating point version of the library.
> 
> --
> Rick
> 
> 
> On Feb 1, 2011, at 10:53:04, Andy Warner wrote:
> 
> > On Tue, Feb 1, 2011 at 12:32 PM, Rick Mann <address@hidden>
> wrote:
> >> [...]
> >> There is clearly something broken in the library.
> >
> > Are you falling foul of the default stripped-down vfprintf()
> implementation.
> > From the vfprintf docs @
> > http://www.nongnu.org/avr-libc/user-
> manual/group__avr__stdio.html#gaa3b98c0d17b35642c0f3e4649092b9f1
> > (scroll down a bit..)
> >
> > ...
> > Since the full implementation of all the mentioned features becomes
> > fairly large, three different flavours of vfprintf() can be selected
> > using linker options. The default vfprintf() implements all the
> > mentioned functionality except floating point conversions. A minimized
> > version of vfprintf() is available that only implements the very basic
> > integer and string conversion facilities, but only the # additional
> > option can be specified using conversion flags (these flags are parsed
> > correctly from the format specification, but then simply ignored).
> > This version can be requested using the following compiler options:
> >
> >   -Wl,-u,vfprintf -lprintf_min
> >
> > If the full functionality including the floating point conversions is
> > required, the following options should be used:
> >
> >   -Wl,-u,vfprintf -lprintf_flt -lm
> >
> > ...
> >
> > --
> > Andy
> >
> > _______________________________________________
> > AVR-chat mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/avr-chat
> 
> 
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