netdev - Re: [PATCH net-next 1/3] netdevsim: allow two netdevsim ports to be

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Message-ID: <54f9c382-f38b-4847-909a-2f9b122ab6d2@davidwei.uk>
Date: Fri, 8 Dec 2023 14:04:36 -0800
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next 1/3] netdevsim: allow two netdevsim ports to be

On 2023-12-08 09:58, Jakub Kicinski wrote:
> On Thu,  7 Dec 2023 09:21:15 -0800 David Wei wrote:
>> +	ret = copy_from_user(buf, data, count);
>> +	if (ret)
>> +		return -EFAULT;
>> +	buf[count] = '\0';
>> +
>> +	cur = buf;
>> +	token = strsep(&cur, " ");
>> +	if (!token)
>> +		return -EINVAL;
>> +	ret = kstrtouint(token, 10, &id);
>> +	if (ret)
>> +		return ret;
>> +
>> +	token = strsep(&cur, " ");
>> +	if (!token)
>> +		return -EINVAL;
>> +	ret = kstrtouint(token, 10, &port);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* too many args */
>> +	if (strsep(&cur, " "))
>> +		return -E2BIG;
> 
> What's wrong with scanf?

Also responded to Jiri:

I went with strstep() instead of sscanf() because sscanf("%u %u", ...)
does not fail with echo "1 2 3 4". I'm happy to use sscanf() though if
this is not an issue.