linux-kernel - Re: [PATCH v2 0/5] [RFC] copy_strtok_from

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Date:	Thu, 26 Feb 2009 07:48:22 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 0/5] [RFC] copy_strtok_from_user


On Thu, 26 Feb 2009, Steven Rostedt wrote:
> 
> not really. strsep stops at the first delimiter. strtok skips multiple 

I may have read the man page wrong. It does stop at the token not the 
delimiter.

Never mind :-p

-- Steve

> delimiters. I could implement the copy_strtok_from_user with a 
> copy_from_user (all of read), and then use strtok_r (reentrant version) to 
> find the next token. This would require implementing strtok_r for the 
> kernel.
> 
> Having the copy_strtok_from_user will handle the copying and the caller 
> would not need to worry about having a big enough buffer to hold 
> delimiters and tokens. The copy_strtok_from_user would copy first to an 
> internal buffer, then scan for tokens to copy into the callers buffer. 
> Then repeat until read or copy limits have been hit.
> 
> -- Steve
> 
> 
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