зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
3.8 KiB
C
143 строки
3.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993
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* Margo Seltzer. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Margo Seltzer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)hsearch.c 10.9 (Sleepycat) 4/18/98";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#endif
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#define DB_DBM_HSEARCH 1
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#include "db_int.h"
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static DB *dbp;
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static ENTRY retval;
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int
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__db_hcreate(nel)
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size_t nel;
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{
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DB_INFO dbinfo;
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memset(&dbinfo, 0, sizeof(dbinfo));
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dbinfo.db_pagesize = 512;
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dbinfo.h_ffactor = 16;
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dbinfo.h_nelem = (u_int32_t)nel; /* XXX: Possible overflow. */
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errno = db_open(NULL,
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DB_HASH, DB_CREATE, __db_omode("rw----"), NULL, &dbinfo, &dbp);
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return (errno == 0 ? 1 : 0);
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}
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ENTRY *
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__db_hsearch(item, action)
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ENTRY item;
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ACTION action;
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{
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DBT key, val;
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if (dbp == NULL) {
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errno = EINVAL;
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return (NULL);
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}
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memset(&key, 0, sizeof(key));
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memset(&val, 0, sizeof(val));
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key.data = item.key;
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key.size = strlen(item.key) + 1;
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switch (action) {
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case ENTER:
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val.data = item.data;
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val.size = strlen(item.data) + 1;
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/*
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* Try and add the key to the database. If we fail because
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* the key already exists, return the existing key.
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*/
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if ((errno =
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dbp->put(dbp, NULL, &key, &val, DB_NOOVERWRITE)) == 0)
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break;
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if (errno != DB_KEYEXIST)
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return (NULL);
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if ((errno = dbp->get(dbp, NULL, &key, &val, 0)) == 0)
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break;
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if (errno == DB_NOTFOUND) /* XXX: can't happen. */
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errno = EINVAL;
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break;
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case FIND:
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if ((errno = dbp->get(dbp, NULL, &key, &val, 0)) != 0) {
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if (errno == DB_NOTFOUND)
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errno = 0;
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return (NULL);
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}
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item.data = (char *)val.data;
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break;
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default:
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errno = EINVAL;
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return (NULL);
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}
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retval.key = item.key;
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retval.data = item.data;
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return (&retval);
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}
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void
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__db_hdestroy()
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{
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if (dbp != NULL) {
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(void)dbp->close(dbp, 0);
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dbp = NULL;
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}
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}
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