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Date: Wed, 11 Aug 2004 18:24:02 -0600 (MDT)
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To: thib@mi.is
From: "M. Warner Losh" <imp@bsdimp.com>
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cc: freebsd-hackers@freebsd.org
Subject: Re: Where is strnlen() ?
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In message: <20040811193254.6f0be2c2.thib@mi.is>
            "Thordur Ivar B." <thib@mi.is> writes:
: While porting software from a friend wich was developed under Linux, I stumbled
: upon an error: src/socket.c:236: warning: implicit declaration of function
: `strnlen'
: 
: Now my programming experience is nothing to brag about but I wonder why strnlen
: is not a part of FreeBSD's libc. I think that the use of strlen() insted of
: strnlen() could resault in buffer-overflow risks and my fellows (most of them
: are more experienced in the art of programming say that bounds checking is
: always good.) 
: 
: I have not found anything on google about this subject and if there is something
: that i overlooked then I'm real sorry for spamming this list.

strnlen() isn't a standardized function.  It is a linuxism.  Generally
FreeBSD only includes functions in libc that are part of Posix (or
traditionally been in BSD) to prevent namespace pollution.

Warner