cdebd14937
libopenbsd is an internal library which to bring in compatibility stuff from OpenBSD. This will allow us to bring in more OpenBSD utilities into the FreeBSD base system. We similarly use libnetbsd for bringing in stuff from NetBSD. Reviewed by: bapt Differential Revision: https://reviews.freebsd.org/D4078
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* $OpenBSD: src/lib/libutil/ohash.h,v 1.2 2014/06/02 18:52:03 deraadt Exp $ */
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/* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $FreeBSD$
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*/
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#ifndef OHASH_H
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#define OHASH_H
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#include <stddef.h>
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/* Open hashing support.
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* Open hashing was chosen because it is much lighter than other hash
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* techniques, and more efficient in most cases.
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*/
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/* user-visible data structure */
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struct ohash_info {
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ptrdiff_t key_offset;
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void *data; /* user data */
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void *(*calloc)(size_t, size_t, void *);
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void (*free)(void *, void *);
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void *(*alloc)(size_t, void *);
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};
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struct _ohash_record;
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/* private structure. It's there just so you can do a sizeof */
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struct ohash {
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struct _ohash_record *t;
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struct ohash_info info;
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unsigned int size;
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unsigned int total;
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unsigned int deleted;
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};
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/* For this to be tweakable, we use small primitives, and leave part of the
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* logic to the client application. e.g., hashing is left to the client
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* application. We also provide a simple table entry lookup that yields
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* a hashing table index (opaque) to be used in find/insert/remove.
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* The keys are stored at a known position in the client data.
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*/
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__BEGIN_DECLS
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void ohash_init(struct ohash *, unsigned, struct ohash_info *);
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void ohash_delete(struct ohash *);
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unsigned int ohash_lookup_interval(struct ohash *, const char *,
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const char *, uint32_t);
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unsigned int ohash_lookup_memory(struct ohash *, const char *,
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size_t, uint32_t);
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void *ohash_find(struct ohash *, unsigned int);
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void *ohash_remove(struct ohash *, unsigned int);
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void *ohash_insert(struct ohash *, unsigned int, void *);
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void *ohash_first(struct ohash *, unsigned int *);
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void *ohash_next(struct ohash *, unsigned int *);
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unsigned int ohash_entries(struct ohash *);
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void *ohash_create_entry(struct ohash_info *, const char *, const char **);
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uint32_t ohash_interval(const char *, const char **);
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unsigned int ohash_qlookupi(struct ohash *, const char *, const char **);
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unsigned int ohash_qlookup(struct ohash *, const char *);
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__END_DECLS
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#endif
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