linux-kernel - Re: [PATCH 3/3] viafb: use read-only mode parsing

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Date:	Sun, 13 Sep 2009 21:04:58 +0200
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	JosephChan@....com.tw, ScottFang@...tech.com.cn
Subject: Re: [PATCH 3/3] viafb: use read-only mode parsing

Andrew Morton schrieb:
> On Mon,  7 Sep 2009 02:24:44 +0000
> Florian Tobias Schandinat <FlorianSchandinat@....de> wrote:
> 
>> +static void parse_mode(const char *str, u32 *xres, u32 *yres)
>> +{
>> +	char *ptr;
>> +
>> +	*xres = simple_strtoul(str, &ptr, 10);
>> +	if (ptr[0] != 'x')
>> +		goto out_default;
>> +
>> +	*yres = simple_strtoul(&ptr[1], &ptr, 10);
>> +	if (ptr[0])
>> +		goto out_default;
>> +
>> +	return;
>> +
>> +out_default:
>> +	printk(KERN_WARNING "viafb received invalid mode string: %s\n", str);
>> +	*xres = 640;
>> +	*yres = 480;
>> +}
> 
> One wonders if we could use sscanf here?

You're right.
But I am planning to add the optional arguments -<bpp> and @<refresh> to 
make it easier to select a mode and slowly move towards generic modedb 
format. I think that can be done easier with pointer handling than 
sscanf usage but I don't have a strong opinion about it so feel free to 
request me to change it.

Example: (new format)
viafb_mode=800x480-16@60
instead (old format)
viafb_mode=800x480 viafb_bpp=16 viafb_refresh=60

> The second simple_strtoul() could use strict_strtoul(), but that's not
> obviously superior IMO.

True.


Thanks,

Florian Tobias Schandinat
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