Document BUF_strnlen

 size_t BUF_strlcat(char *dst, const char *src, size_t size);

 size_t BUF_strnlen(const char *str, size_t maxlen);

=head1 DESCRIPTION

The buffer library handles simple character arrays. Buffers are used for

B<len>. Any data already in the buffer is preserved if it increases in

size.

BUF_strdup(), BUF_strndup(), BUF_memdup(), BUF_strlcpy() and

BUF_strlcat() are equivalents of the standard C library functions. The

dup() functions use OPENSSL_malloc() underneath and so should be used

in preference to the standard library for memory leak checking or

replacing the malloc() function.

BUF_strdup(), BUF_strndup(), BUF_memdup(), BUF_strlcpy(),

BUF_strlcat() and BUF_strnlen are equivalents of the standard C

library functions. The dup() functions use OPENSSL_malloc() underneath

and so should be used in preference to the standard library for memory

leak checking or replacing the malloc() function.

Memory allocated from these functions should be freed up using the

OPENSSL_free() function.