Re: [PATCH v4 next 00/23] Enhance printf()

["Thomas Weißschuh" <linux@weissschuh.net>]

Hi David,

On 2026-03-02 10:17:52+0000, david.laight.linux@gmail.com wrote:
> From: David Laight <david.laight.linux@gmail.com>

(...)

I am happy with the patches of this series.

> David Laight (23):
>   tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h

>   tools/nolibc/printf: Move snprintf length check to callback
>   selftests/nolibc: Return correct value when printf test fails
>   selftests/nolibc: check vsnprintf() output buffer before the length
>   selftests/nolibc: Use length of 'expected' string to check snprintf() output
>   selftests/nolibc: Check that snprintf() doesn't write beyond the buffer end
>   selftests/nolibc: Let EXPECT_VFPRINTF() tests be skipped

>   selftests/nolibc: Rename w to written in expect_vfprintf()

Unfortunately b4 chokes on these patches because this patch is missing
the 'v4' tag in the subject prefix. Given that the one below needs some
changes anyways, I was lazy and applied the series only up until here.
(Patch 1 is also not applied, as there was no user yet for
_NOLIBC_OPTIMIZER_HIDE_VAR() ).

Could you rebase the series on nolibc-next, add the error handling
to strerror_r(), fix the wording nitpicks from Willy and resend the
patches? I can also try to fix this up locally, but that would be more
work on my side than it would be for you I reckon.
Let me know if this is an issue and I'll try to make it work.

Willy:

I interpreted your mail [0] as Acked-by for the whole series.

[0] https://lore.kernel.org/lkml/aawDlqLdpgsfGI4r@1wt.eu/

>   tools/nolibc: Implement strerror() in terms of strerror_r()
>   tools/nolibc: Rename the 'errnum' parameter to strerror()
>   tools/nolibc/printf: Output pad characters in 16 byte chunks
>   tools/nolibc/printf: Simplify __nolibc_printf()
>   tools/nolibc/printf: Use goto and reduce indentation
>   tools/nolibc/printf: Use bit-masks to hold requested  flag, length and conversion chars
>   tools/nolibc/printf: Add support for length modifiers tzqL and formats iX
>   tools/nolibc/printf: Handle "%s" with the numeric formats
>   tools/nolibc/printf: Prepend sign to converted number
>   tools/nolibc/printf: Add support for conversion flags space and plus
>   tools/nolibc/printf: Special case 0 and add support for %#x
>   tools/nolibc/printf: Add support for left aligning fields
>   tools/nolibc/printf: Add support for zero padding and field precision
>   tools/nolibc/printf: Add support for octal output
>   selftests/nolibc: Use printf variable field widths and precisions
> 
>  tools/include/nolibc/compiler.h              |   3 +
>  tools/include/nolibc/stdio.h                 | 501 ++++++++++++++-----
>  tools/testing/selftests/nolibc/nolibc-test.c | 157 +++---
>  3 files changed, 469 insertions(+), 192 deletions(-)