linux-kernel - Re: [PATCH v4 05/12] seq_file: provide an analogue of print_hex

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Date:	Tue, 16 Sep 2014 10:11:06 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Helge Deller <deller@....de>,
	Ingo Tuchscherer <ingo.tuchscherer@...ibm.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
	Marek Vasut <marex@...x.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>,
	Benjamin Romer <benjamin.romer@...sys.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v4 05/12] seq_file: provide an analogue of
 print_hex_dump()

On Thu, 2014-09-04 at 17:26 +0300, Andy Shevchenko wrote:
> The new seq_hex_dump() is a complete analogue of print_hex_dump().
> 
> We have few users of this functionality already. It allows to reduce their
> codebase.

Al, what do you think about this version?

> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  fs/seq_file.c            | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/seq_file.h |  4 ++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/fs/seq_file.c b/fs/seq_file.c
> index 3857b72..66c721f4 100644
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -12,6 +12,7 @@
>  #include <linux/slab.h>
>  #include <linux/cred.h>
>  #include <linux/mm.h>
> +#include <linux/printk.h>
>  
>  #include <asm/uaccess.h>
>  #include <asm/page.h>
> @@ -794,6 +795,55 @@ void seq_pad(struct seq_file *m, char c)
>  }
>  EXPORT_SYMBOL(seq_pad);
>  
> +/* Analogue of print_hex_dump() */
> +int seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
> +		 int rowsize, int groupsize, const void *buf, size_t len,
> +		 bool ascii)
> +{
> +	const u8 *ptr = buf;
> +	int i, linelen, remaining = len;
> +	int ret;
> +
> +	if (rowsize != 16 && rowsize != 32)
> +		rowsize = 16;
> +
> +	for (i = 0; i < len; i += rowsize) {
> +		linelen = min(remaining, rowsize);
> +		remaining -= rowsize;
> +
> +		/* Prefix string */
> +		ret = seq_printf(m, "%s", prefix_str);
> +		if (ret < 0)
> +			return ret;
> +
> +		/* Counter if asked */
> +		if (prefix_type == DUMP_PREFIX_ADDRESS)
> +			ret = seq_printf(m, "%p: ", ptr + i);
> +		else if (prefix_type == DUMP_PREFIX_OFFSET)
> +			ret = seq_printf(m, "%.8x: ", i);
> +		if (ret < 0)
> +			return ret;
> +
> +		/* Hex dump */
> +		ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
> +					 m->buf + m->count, m->size - m->count,
> +					 ascii);
> +		if (m->count + ret >= m->size) {
> +			seq_set_overflow(m);
> +			return -1;
> +		}
> +		m->count += ret;
> +
> +		/* EOL */
> +		ret = seq_putc(m, '\n');
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(seq_hex_dump);
> +
>  struct list_head *seq_list_start(struct list_head *head, loff_t pos)
>  {
>  	struct list_head *lh;
> diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
> index 52e0097..5de290c 100644
> --- a/include/linux/seq_file.h
> +++ b/include/linux/seq_file.h
> @@ -107,6 +107,10 @@ int seq_write(struct seq_file *seq, const void *data, size_t len);
>  __printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
>  __printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);
>  
> +int seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
> +		 int rowsize, int groupsize, const void *buf, size_t len,
> +		 bool ascii);
> +
>  int seq_path(struct seq_file *, const struct path *, const char *);
>  int seq_dentry(struct seq_file *, struct dentry *, const char *);
>  int seq_path_root(struct seq_file *m, const struct path *path,


-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy

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