1*4afad3d8SPeter Avalos #ifndef OHASH_H 2*4afad3d8SPeter Avalos #define OHASH_H 3*4afad3d8SPeter Avalos /* $OpenBSD: ohash.h,v 1.8 2005/12/29 18:54:47 jaredy Exp $ */ 4*4afad3d8SPeter Avalos /* ex:ts=8 sw=4: 5*4afad3d8SPeter Avalos */ 6*4afad3d8SPeter Avalos 7*4afad3d8SPeter Avalos /* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org> 8*4afad3d8SPeter Avalos * 9*4afad3d8SPeter Avalos * Permission to use, copy, modify, and distribute this software for any 10*4afad3d8SPeter Avalos * purpose with or without fee is hereby granted, provided that the above 11*4afad3d8SPeter Avalos * copyright notice and this permission notice appear in all copies. 12*4afad3d8SPeter Avalos * 13*4afad3d8SPeter Avalos * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14*4afad3d8SPeter Avalos * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15*4afad3d8SPeter Avalos * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16*4afad3d8SPeter Avalos * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17*4afad3d8SPeter Avalos * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18*4afad3d8SPeter Avalos * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19*4afad3d8SPeter Avalos * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20*4afad3d8SPeter Avalos * 21*4afad3d8SPeter Avalos * $FreeBSD: src/usr.bin/m4/lib/ohash.h,v 1.2 2012/11/17 01:54:24 svnexp Exp $ 22*4afad3d8SPeter Avalos */ 23*4afad3d8SPeter Avalos 24*4afad3d8SPeter Avalos /* Open hashing support. 25*4afad3d8SPeter Avalos * Open hashing was chosen because it is much lighter than other hash 26*4afad3d8SPeter Avalos * techniques, and more efficient in most cases. 27*4afad3d8SPeter Avalos */ 28*4afad3d8SPeter Avalos 29*4afad3d8SPeter Avalos struct ohash_info { 30*4afad3d8SPeter Avalos ptrdiff_t key_offset; 31*4afad3d8SPeter Avalos void *data; /* user data */ 32*4afad3d8SPeter Avalos void *(*halloc)(size_t, void *); 33*4afad3d8SPeter Avalos void (*hfree)(void *, size_t, void *); 34*4afad3d8SPeter Avalos void *(*alloc)(size_t, void *); 35*4afad3d8SPeter Avalos }; 36*4afad3d8SPeter Avalos 37*4afad3d8SPeter Avalos struct _ohash_record; 38*4afad3d8SPeter Avalos 39*4afad3d8SPeter Avalos struct ohash { 40*4afad3d8SPeter Avalos struct _ohash_record *t; 41*4afad3d8SPeter Avalos struct ohash_info info; 42*4afad3d8SPeter Avalos unsigned int size; 43*4afad3d8SPeter Avalos unsigned int total; 44*4afad3d8SPeter Avalos unsigned int deleted; 45*4afad3d8SPeter Avalos }; 46*4afad3d8SPeter Avalos 47*4afad3d8SPeter Avalos /* For this to be tweakable, we use small primitives, and leave part of the 48*4afad3d8SPeter Avalos * logic to the client application. e.g., hashing is left to the client 49*4afad3d8SPeter Avalos * application. We also provide a simple table entry lookup that yields 50*4afad3d8SPeter Avalos * a hashing table index (opaque) to be used in find/insert/remove. 51*4afad3d8SPeter Avalos * The keys are stored at a known position in the client data. 52*4afad3d8SPeter Avalos */ 53*4afad3d8SPeter Avalos __BEGIN_DECLS 54*4afad3d8SPeter Avalos void ohash_init(struct ohash *, unsigned, struct ohash_info *); 55*4afad3d8SPeter Avalos void ohash_delete(struct ohash *); 56*4afad3d8SPeter Avalos 57*4afad3d8SPeter Avalos unsigned int ohash_lookup_interval(struct ohash *, const char *, 58*4afad3d8SPeter Avalos const char *, uint32_t); 59*4afad3d8SPeter Avalos unsigned int ohash_lookup_memory(struct ohash *, const char *, 60*4afad3d8SPeter Avalos size_t, uint32_t); 61*4afad3d8SPeter Avalos void *ohash_find(struct ohash *, unsigned int); 62*4afad3d8SPeter Avalos void *ohash_remove(struct ohash *, unsigned int); 63*4afad3d8SPeter Avalos void *ohash_insert(struct ohash *, unsigned int, void *); 64*4afad3d8SPeter Avalos void *ohash_first(struct ohash *, unsigned int *); 65*4afad3d8SPeter Avalos void *ohash_next(struct ohash *, unsigned int *); 66*4afad3d8SPeter Avalos unsigned int ohash_entries(struct ohash *); 67*4afad3d8SPeter Avalos 68*4afad3d8SPeter Avalos void *ohash_create_entry(struct ohash_info *, const char *, const char **); 69*4afad3d8SPeter Avalos uint32_t ohash_interval(const char *, const char **); 70*4afad3d8SPeter Avalos 71*4afad3d8SPeter Avalos unsigned int ohash_qlookupi(struct ohash *, const char *, const char **); 72*4afad3d8SPeter Avalos unsigned int ohash_qlookup(struct ohash *, const char *); 73*4afad3d8SPeter Avalos __END_DECLS 74*4afad3d8SPeter Avalos #endif 75