forgot to actually remove file, thanks jmc

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-.\"	$OpenBSD: hash.9,v 1.7 2013/06/04 19:27:07 schwarze Exp $
-.\"
-.\" Copyright (c) 2001 Tobias Weingartner
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: June 4 2013 $
-.Dt HASH 9
-.Os
-.Sh NAME
-.Nm hash
-.\" XXX - Should all these be .Nm as well?
-.\" .Nm hash32 ,
-.\" .Nm hash32_buf ,
-.\" .Nm hash32_str ,
-.\" .Nm hash32_strn ,
-.\" .Nm hash32_stre ,
-.\" .Nm hash32_strne
-.Nd general kernel hashing functions
-.Sh SYNOPSIS
-.In sys/hash.h
-.Ft uint32_t
-.Fn hash32_buf "void *buf" "size_t len" "uint32_t hash"
-.Ft uint32_t
-.Fn hash32_str "void *buf" "uint32_t hash"
-.Ft uint32_t
-.Fn hash32_strn "void *buf" "size_t len" "uint32_t hash"
-.Ft uint32_t
-.Fn hash32_stre "void *buf" "int end" "char **ep" "uint32_t hash"
-.Ft uint32_t
-.Fn hash32_strne "void *buf" "size_t len" "int end" "char **ep" "uint32_t hash"
-.Sh DESCRIPTION
-The
-.Fn hash32
-functions are used to give a consistent and general interface to
-a decent hashing algorithm within the kernel.
-These functions can be used to hash ASCII
-.Dv NUL
-terminated strings, as well as blocks of memory.
-.Pp
-The
-.Fn hash32_buf
-function is used as a general buffer hashing function.
-The argument
-.Fa buf
-is used to pass in the location, and
-.Fa len
-is the length of the buffer.
-The argument
-.Fa hash
-is used to extend an existing hash, or is passed the initial value
-.Dv HASHINIT
-to start a new hash.
-.Pp
-The
-.Fn hash32_str
-function is used to hash a
-.Dv NUL
-terminated string passed in
-.Fa buf
-with initial hash value given in
-.Fa hash .
-.Pp
-The
-.Fn hash32_strn
-function is like the
-.Fn hash32_str
-function, except it also takes a
-.Fa len
-argument, which is the maximal length of the expected string.
-.Pp
-The
-.Fn hash32_stre
-and
-.Fn hash32_strne
-functions are helper functions used by the kernel to hash pathname
-components.
-These functions have the additional termination condition
-of terminating when they find a character given by
-.Fa end
-in the string to be hashed.
-If the argument
-.Fa ep
-is not
-.Dv NULL ,
-it is set to the point in the buffer at which the hash function
-terminated hashing.
-.Sh RETURN VALUES
-The
-.Fn hash32
-functions return a 32 bit hash value of the buffer or string.
-.Sh EXAMPLES
-.Bd -literal -offset indent
-LIST_HEAD(head, cache) *hashtbl = NULL;
-u_long mask = 0;
-
-void
-sample_init(void)
-{
-	hashtbl = hashinit(numwanted, type, flags, &mask);
-}
-
-void
-sample_use(char *str, int len)
-{
-	uint32_t hash;
-
-	hash = hash32_str(str, HASHINIT);
-	hash = hash32_buf(&len, sizeof(len), hash);
-	hashtbl[hash & mask] = len;
-}
-.Ed
-.Sh SEE ALSO
-.Xr free 9 ,
-.Xr hashinit 9 ,
-.Xr malloc 9
-.Sh LIMITATIONS
-The
-.Fn hash32
-functions are only 32 bit functions.
-They will prove to give poor 64 bit performance, especially for the
-top 32 bits.
-At the current time, this is not seen as a great limitation, as these
-hash values are usually used to index into an array.
-Should these hash values be used for other means, this limitation should
-be revisited.
-.Sh HISTORY
-The
-.Nm
-functions were first committed to
-.Nx 1.6 .
-The
-.Ox
-versions were written and massaged for
-.Ox 2.3
-by Tobias Weingartner,
-and finally committed for
-.Ox 3.2 .