There is a bug on sprintf newlib when using specifier %-*.llu
Richard Damon
Richard@Damon-Family.org
Sat Mar 7 11:39:33 GMT 2020
On 3/7/20 3:30 AM, ng boon khai wrote:
> Hi,
>
> I found a bug when using the newlib sprinf using the spcifier %-*.llu
>
> Below is the code snippet
>
> function (){
> int64_t longval;
> longval=(int64_t)(1);
> char comparebuf[2000];
> sprintf(comparebuf, "testing string! arg1=%-*.llu, arg2=%-*.llu",1,longval,1,longval);
> printf(comparebuf);
> }
>
> And i get this outcome
> testing string! arg1=499644, arg2=
>
> Expected outcome should be
> testing string! arg1=1, arg2=1
>
> Regards,
> Ng Boon Khai.
>
One issue with your program is that you have a variable of type int64_t
but using a format that expects an unsigned long long.
In some implementations, long long might be 64 bits, but in others long
long will be 128 bits.
If you want to print an int64_t, you should be using the format
specified from the macro PRId64
If you want to use llu, you should be using a variable of type unsigned
long long
--
Richard Damon
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