linux-kernel - Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

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Message-ID: <CAKwiHFi_nngthth0wZkaPviVeS+8SWDtTw6gJcDAHCqiwXAG2A@mail.gmail.com>
Date: Fri, 21 Feb 2025 12:54:57 +0100
From: Rasmus Villemoes <linux@...musvillemoes.dk>
To: Aditya Garg <gargaditya08@...e.com>
Cc: "pmladek@...e.com" <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, 
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	Sven Peter <sven@...npeter.dev>, Janne Grunau <j@...nau.net>
Subject: Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by
 extending %p4cc

On Fri, 21 Feb 2025 at 12:37, Aditya Garg <gargaditya08@...e.com> wrote:
>
> From: Hector Martin <marcan@...can.st>
>
> %p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
> it's useful to be able to print generic 4-character codes formatted as
> an integer. Extend it to add format specifiers for printing generic
> 32-bit FOURCCs with various endian semantics:
>
> %p4ch   Host-endian
> %p4cl   Little-endian
> %p4cb   Big-endian
> %p4cr   Reverse-endian
>
> The endianness determines how bytes are interpreted as a u32, and the
> FOURCC is then always printed MSByte-first (this is the opposite of
> V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
> allow printing LSByte-first FOURCCs stored in host endian order
> (other than the hex form being in character order, not the integer
> value).
>
> Signed-off-by: Hector Martin <marcan@...can.st>
> Signed-off-by: Aditya Garg <gargaditya08@...e.com>

Acked-by: Rasmus Villemoes <linux@...musvillemoes.dk>