Re: [PATCH v2 09/10] efi/libstub: Add efi_snprintf() to construct wide strings

[Vincent Mailhol <mailhol@kernel.org>]

On 9/9/26 13:55, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@kernel.org>
> 
> The native EFI character set is UTF-16 (or in practice, UCS-2).
> Implement efi_snprintf() to construct UTF-16 strings using printf style
> templates. This will be used in a subsequent patch to set the
> LoaderDevicePartUUID EFI variable.
> 
> Link: https://lore.kernel.org/all/20260903-efi_stub_bli-v2-1-dbf7ba915117@kernel.org/
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  drivers/firmware/efi/libstub/efistub.h  |  1 +
>  drivers/firmware/efi/libstub/vsprintf.c | 11 +++++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
> index 36056c624782..880c1d0c464b 100644
> --- a/drivers/firmware/efi/libstub/efistub.h
> +++ b/drivers/firmware/efi/libstub/efistub.h
> @@ -1084,6 +1084,7 @@ int efi_vsnprintf(efi_char16_t *buf, size_t size, const char *fmt, va_list ap,
>  		  bool crlf);
>  
>  __printf(1, 2) int efi_printk(char const *fmt, ...);
> +__printf(3, 4) int efi_snprintf(efi_char16_t *buf, size_t size, const char *fmt, ...);
>  
>  void efi_free(unsigned long size, unsigned long addr);
>  DEFINE_FREE(efi_pool, void *, if (_T) efi_bs_call(free_pool, _T));
> diff --git a/drivers/firmware/efi/libstub/vsprintf.c b/drivers/firmware/efi/libstub/vsprintf.c
> index 7f6b891a338a..34a19495dace 100644
> --- a/drivers/firmware/efi/libstub/vsprintf.c
> +++ b/drivers/firmware/efi/libstub/vsprintf.c
> @@ -509,3 +509,14 @@ int efi_vsnprintf(efi_char16_t *buf, size_t size, const char *fmt, va_list ap,
>  
>  	return pos;
>  }
> +
> +int efi_snprintf(efi_char16_t *buf, size_t size, const char *fmt, ...)
> +{
> +       va_list args;
> +       int i;
> +
> +       va_start(args, fmt);
> +       i = efi_vsnprintf(buf, size, fmt, args, false);
> +       va_end(args);
> +       return i;


checkpatch.pl is complaining about the use of spaces instead of tabulations:

  WARNING: please, no spaces at the start of a line
  #41: FILE: drivers/firmware/efi/libstub/vsprintf.c:515:
  +       va_list args;$

  WARNING: please, no spaces at the start of a line
  #42: FILE: drivers/firmware/efi/libstub/vsprintf.c:516:
  +       int i;$

  WARNING: please, no spaces at the start of a line
  #44: FILE: drivers/firmware/efi/libstub/vsprintf.c:518:
  +       va_start(args, fmt);$

  WARNING: please, no spaces at the start of a line
  #45: FILE: drivers/firmware/efi/libstub/vsprintf.c:519:
  +       i = efi_vsnprintf(buf, size, fmt, args, false);$

  WARNING: please, no spaces at the start of a line
  #46: FILE: drivers/firmware/efi/libstub/vsprintf.c:520:
  +       va_end(args);$

  WARNING: please, no spaces at the start of a line
  #47: FILE: drivers/firmware/efi/libstub/vsprintf.c:521:
  +       return i;$


> +}


Yours sincerely,
Vincent Mailhol