[PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Joe Perches]

[trivial notes]

On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:
> This allows user to print a given buffer as esaped string. The rules applied

as an escaped

> accordingly to the mix of the flags provided by additional format letters.

rules are applied according to an optional mix of flags

> For example, if the given buffer:
> 
> 	1b 62 20 5c 43 07 22 90 0d 5d
> 
> The result strings could be:

would be

> 	%*pE            "\eb \C\a"\220\r]"

Maybe say something about ssid's here.
or maybe add an %*pES just for the ssid type.

> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
[]
> @@ -70,6 +70,34 @@ DMA addresses types dma_addr_t:
>  	For printing a dma_addr_t type which can vary based on build options,
>  	regardless of the width of the CPU data path. Passed by reference.
>  
> +Raw buffer as an escaped string:
> +
> +	%*pE[achnops]
> +
> +	For printing raw buffer as an escaped string. For the following buffer
> +
> +		1b 62 20 5c 43 07 22 90 0d 5d
> +
> +	few examples show how the conversion could be done (the result string
> +	without embraced quotes):

'embraced' is a bit of an awkward word choice.  Maybe surrounding.

> +
> +		%*pE		"\eb \C\a"\220\r]"

Oh, the initial commit log comments above are really for this block

> +		%*pEhp		"\x1bb \C\x07"\x90\x0d]"
> +		%*pEa		"\e\142\040\\\103\a\042\220\r\135"
> +
> +	The converion rules are defined by combination of the following flags

conversion

> +	(see string_escape_mem() kernel documentation for the details):
> +		a - ESCAPE_ANY
> +		c - ESCAPE_SPECIAL
> +		h - ESCAPE_HEX
> +		n - ESCAPE_NULL
> +		o - ESCAPE_OCTAL
> +		p - ESCAPE_NP
> +		s - ESCAPE_SPACE
> +	By default ESCAPE_ANY_NP is used.
> +
> +	If field width is ommited the 1 byte only will be escaped.

omitted