Re: [PATCH next] ACPICA: AML Parser: Remove spurious precision from format used to dump parse trees

[David Laight]

On Fri, 27 Mar 2026 11:28:26 +0200
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:

> On Thu, Mar 26, 2026 at 08:18:30PM +0000, david.laight.linux@xxxxxxxxx wrote:
> 
> > The debug code in acpi_ps_delete_parse_tree() uses ("%*.s", level * 4, " ")
> > to indent traces.
> > POSIX requires the empty precision be treated as zero, but the kernel treats
> > is as 'no precision specified'.
> > Change to ("%*s", level * 4, "") since there is additional whitespace and no
> > reason to indent by one space when level is zero.  
> 
> This is cross-platform code. Does the same applies to MS VC compiler, for
> example?
> 

Everything except the linux kernel will treat "%*.s" as "%*.0s".

Regardless of anything else specifying a 'precision' when printing
a constant string is entirely pointless - it limits the number of
characters copied from the string.

Basically "%*.s" is always a typo, either for "%.*s" or "%*s".

	David