Need strnlen().

[Stephen J. Muir]

I think that there should be a function called "strnlen" as follows:

int strnlen (string, size)
	char	*string;
	int	size;

where "size" is the maximum number of bytes in "string".

The reason is that, if a character array is passed as argument, and it is not
terminated with a null byte, then "strlen" will keep going, possibly hitting an
unallocated piece of memory.
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