On (22/01/29 15:53), Waiman Long wrote:
> For *scnprintf(), vsnprintf() is always called even if the input size is
> 0. That is a waste of time, so just return 0 in this case.
>
> Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
> +++ b/lib/vsprintf.c
> @@ -2895,13 +2895,15 @@ int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
> {
> int i;
>
> + if (!size)
> + return 0;
> +
> i = vsnprintf(buf, size, fmt, args);
>
> if (likely(i < size))
> return i;
> - if (size != 0)
> - return size - 1;
> - return 0;
> +
> + return size - 1;
> }
> EXPORT_SYMBOL(vscnprintf);
