# Re: \[PATCH v3 3/7\] lib/hexdump.c: Optionally suppress lines of repeated bytes

- From: Alastair D'Silva \<hidden\>
- Date: 2019-06-17 04:07:51 
- List: netdev
- Page: https://ratatoskr.run/netdev/2019/06/157365
- Thread: https://ratatoskr.run/intel-gfx/2019/06/157354/t.md

```text
On Mon, 2019-06-17 at 12:04 +1000, Alastair D'Silva wrote:
> From: Alastair D'Silva <redacted>
> 
> Some buffers may only be partially filled with useful data, while the
> rest
> is padded (typically with 0x00 or 0xff).
> 
> This patch introduces a flag to allow the supression of lines of
> repeated
> bytes, which are replaced with '** Skipped %u bytes of value 0x%x **'
> 
> An inline wrapper function is provided for backwards compatibility
> with
> existing code, which maintains the original behaviour.
> 
> Signed-off-by: Alastair D'Silva <redacted>
> ---
>  include/linux/printk.h | 25 +++++++++---
>  lib/hexdump.c          | 91 ++++++++++++++++++++++++++++++++++++--
> ----
>  2 files changed, 99 insertions(+), 17 deletions(-)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index cefd374c47b1..d7754799cfe0 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -481,13 +481,18 @@ enum {
>  	DUMP_PREFIX_ADDRESS,
>  	DUMP_PREFIX_OFFSET
>  };
> +
>  extern int hex_dump_to_buffer(const void *buf, size_t len, int
> rowsize,
>  			      int groupsize, char *linebuf, size_t
> linebuflen,
>  			      bool ascii);
> +
> +#define HEXDUMP_ASCII			BIT(0)
> +#define HEXDUMP_SUPPRESS_REPEATED	BIT(1)
> +

This is missing the include of linux/bits.h, I'll fix this in the next
version.

-- 
Alastair D'Silva           mob: 0423 762 819
skype: alastair_dsilva    
Twitter: @EvilDeece
blog: http://alastair.d-silva.org


```