[ECOS] Bug/missing feature in sscanf

[ECOS] Bug/missing feature in sscanf

[Øyvind Harboe]

%llu is not supported and gives no warning...




	unsigned long long cval;
	sscanf ("401", "%llu", &cval);
	if (cval == 401)
	{
		diag_printf("sscanf OK\n");
	} else
	{
		diag_printf("sscanf FAIL\n");
	}


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[ECOS] Re: Bug/missing feature in sscanf

[Øyvind Harboe]

Turns out there was a patch on this that was never followed up on
from 2004(!!):


http://sourceware.org/ml/ecos-patches/2004-02/msg00044.html




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Re: [ECOS] Bug/missing feature in sscanf

[Bart Veer]

>>>>> "Oyvind" == =?UTF-8?Q?=C3=98yvind Harboe?= <oyvind.harboe@zylin.com> writes:

    Oyvind> %llu is not supported and gives no warning...
    Oyvind> 	unsigned long long cval;
    Oyvind> 	sscanf ("401", "%llu", &cval);
    Oyvind> 	if (cval == 401)
    Oyvind> 	{
    Oyvind> 		diag_printf("sscanf OK\n");
    Oyvind> 	} else
    Oyvind> 	{
    Oyvind> 		diag_printf("sscanf FAIL\n");
    Oyvind> 	}

    >>>>> "Oyvind" == =?UTF-8?Q?=C3=98yvind Harboe?= <oyvind.harboe@zylin.com> writes:

    Oyvind> Turns out there was a patch on this that was never followed up on
    Oyvind> from 2004(!!):

    Oyvind> http://sourceware.org/ml/ecos-patches/2004-02/msg00044.html

Looking at the ChangeLog in language/c/libc/stdio, I see:

  2004-08-18  Fredrik Hederstierna  <fredrik@wespot.com>
  2004-08-18  Jonathan Larmour  <jifl@eCosCentric.com>

	* src/input/vfscanf.cxx (vfscanf): Add long long and long double
	support.
	* cdl/stdio.cdl (CYGFUN_LIBC_STDIO_LONGLONG): Make it a new option.

And looking at the sources I see code related to long longs in
vfscanf(). So at first glance the patch was incorporated, and jifl did
additional work on it to allow the long long support to be suppressed
via a CDL option to reduce code size. I assume you have not disabled
CYGFUN_LIBC_STDIO_LONGLONG in your configuration.

What I don't see, unfortunately, is an addition to tests/sscanf.c
(conditional on CYGFUN_LIBC_STDIO_LONGLONG, obviously) to verify that
the code actually works. Hence the relevant code may have been broken
at some point, or there may be a toolchain issue with long longs on
whatever architecture you are using.

Bart

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Re: [ECOS] Bug/missing feature in sscanf

[Øyvind Harboe]

Ahem... right... I didn't know about that option and I jumped to
conclusions after seeing the patch posting on the web that was
committed, but didn't have any response to it in the mailing list...

Configuration with eCos is necessarily trick: enable all
options default and you get code bloat, disable them all
by default and you have to find the missing option that
stops your app from working...

> I assume you have not disabled
> CYGFUN_LIBC_STDIO_LONGLONG in your configuration.

The inferred value was 0. I don't know why the inferred value was 0,
but the default value was 1...

Works fine now! Thanks!

-- 
Øyvind Harboe
http://www.zylin.com/zy1000.html
ARM7 ARM9 ARM11 XScale Cortex
JTAG debugger and flash programmer

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