linux-kernel - Re: [PATCH] lib: vsprintf: add printf format conversion %M for errno strings

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Message-ID: <37d0f40f-2ea8-1fad-2cc7-2d8d45b1a43f@infradead.org>
Date:   Sun, 25 Jun 2017 10:24:14 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Enrico Weigelt, metux IT consult" <enrico.weigelt@...3.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: vsprintf: add printf format conversion %M for errno
 strings

On 06/25/2017 10:12 AM, Enrico Weigelt, metux IT consult wrote:
> Adding a new format conversion for *printf() and friends.
> 
> If CONFIG_ERRNO_PRINTF_VERBOSE is enabled, prints human-readable
> strerror()-like texts, otherwise just the number.
> ---
>  lib/Kconfig    |  19 +++++++
>  lib/vsprintf.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 189 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 0c8b78a9ae2e..b28ab2162435 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -7,6 +7,25 @@ config BINARY_PRINTF
>  
>  menu "Library routines"
>  
> +config ERRNO_PRINTF
> +	bool "printf conversion %M for errno codes"
> +	default n
> +	help
> +	  This option adds an %M modifier for *printf() for errno values.
> +	  (and callers like printk() etc)
> +
> +	  In conjunction with ERRNO_PRINTF_VERBOSE, it prints human readable
> +	  strerror()-like textsm, otherwise just numeric values

	                  text,                          values.

> +
> +config ERRNO_PRINTF_VERBOSE
> +	bool "Verbose errno strings"
> +	default y
> +	depends on ERRNO_PRINTF
> +	help
> +	  Enable verbose error strings for ERRNO_PRINTF.
> +
> +	  Small embedded systems might disable it for reducing kernel size.
> +
>  config RAID6_PQ
>  	tristate
>  


-- 
~Randy