On Wed, Feb 14, 2018 at 04:24:16PM -0200, Geraldo Netto wrote:
> Dear Friends,
>
> I was playing with musl and I think I may have found an issue on fwrite():
>
> This is the original code:
>
> size_t fwrite(const void *restrict src, size_t size, size_t nmemb,
> FILE *restrict f)
> {
>     size_t k, l = size*nmemb;
>     if (!size) nmemb = 0;
>     FLOCK(f);
>     k = __fwritex(src, l, f);
>     FUNLOCK(f);
>     return k==l ? nmemb : k/size;
> }
>

If size is zero, then l is zero. So __fwritex will be called with l as
zero. Which means, if you read that code, that it will have to return
zero.