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From: walter harms <wharms@bfs.de>
To: kernel-janitors@vger.kernel.org
Subject: Re: [KJ] critical bug in strncpy() - solved
Date: Tue, 29 Mar 2005 07:19:44 +0000	[thread overview]
Message-ID: <42490190.5090703@bfs.de> (raw)

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mea culpa,
for some odd reason i did not see "the dest will be padded with nulls."
i will send a fix for the documentation to the mainling list.

re,
walter


Matthew Wilcox wrote:
> There is no bug in lib/string.c's implementation of strncpy().
> Most people do not realise that strncpy is a stupid function that is
> almost impossible to use correctly.  Read the manpage:
> 
>        The strncpy() function is similar, except that not more than n bytes of
>        src  are copied. Thus, if there is no null byte among the first n bytes
>        of src, the result will not be null-terminated.
> 
>        In the case where the length of src is less than that of n, the remain-
>        der of dest will be padded with nulls.
> 
> This agrees with POSIX, ANSI C and Single Unix, fwiw.
> 

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                 reply	other threads:[~2005-03-29  7:19 UTC|newest]

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