Need strnlen() (???)

[Joseph S. D. Yao]

In article <715 at dedalus.UUCP> roger at dedalus.UUCP (Roger L. Cordes Jr.) writes:
>	What is the big deal here? How about:
>extern	int	strlen();
>static	int	_nstrnlen_;	/* to avoid two calls to strlen() */
>#define	strnlen(S,N)	( (_nstrnlen_=strlen(S)) > (N) ? (N) : _nstrnlen_ )

Once again:  doing a strlen() on something not guaranteed to be
NUL-terminated is guaranteed to net you a core dump sooner or later.
You can declare str to be char str[MAXSIZE+1] and always do a two-step:
str[MAXSIZE] = NUL; n = strlen(str); or you can use the deplorable
function I put on the net to try and end this line of discussion; or
you can give the people who use your code fun trying to figure out
"Oh no!  How did I break the computer?  Where did the core dump, and
can I sweep it under the rug before morning?"	;-)

Incidentally, Doug's suggestion to use memchr() is great, once we
all have ANSI compilers.	;-}
-- 

	Joe Yao		hadron!jsdy at seismo.{CSS.GOV,ARPA,UUCP}