mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 03:10:05 +00:00
71733723fb
(hurd_preempt_signals, hurd_unpreempt_signals): Decls removed. * hurd/hurd/sigpreempt.h: New file. * hurd/preempt-sig.c: Rewritten with new interface. * sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Remove local signal preempters being unwound past. * db: New directory, 4.4 BSD db package incorporated from BSD db-1.85 release. * sysdeps/unix/sysv/linux/sys/param.h: Several new macros for BSD compatibility.
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*-
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)rec_search.c 8.4 (Berkeley) 7/14/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
|
|
#include <db.h>
|
|
#include "recno.h"
|
|
|
|
/*
|
|
* __REC_SEARCH -- Search a btree for a key.
|
|
*
|
|
* Parameters:
|
|
* t: tree to search
|
|
* recno: key to find
|
|
* op: search operation
|
|
*
|
|
* Returns:
|
|
* EPG for matching record, if any, or the EPG for the location of the
|
|
* key, if it were inserted into the tree.
|
|
*
|
|
* Returns:
|
|
* The EPG for matching record, if any, or the EPG for the location
|
|
* of the key, if it were inserted into the tree, is entered into
|
|
* the bt_cur field of the tree. A pointer to the field is returned.
|
|
*/
|
|
EPG *
|
|
__rec_search(t, recno, op)
|
|
BTREE *t;
|
|
recno_t recno;
|
|
enum SRCHOP op;
|
|
{
|
|
register indx_t index;
|
|
register PAGE *h;
|
|
EPGNO *parent;
|
|
RINTERNAL *r;
|
|
pgno_t pg;
|
|
indx_t top;
|
|
recno_t total;
|
|
int sverrno;
|
|
|
|
BT_CLR(t);
|
|
for (pg = P_ROOT, total = 0;;) {
|
|
if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
|
|
goto err;
|
|
if (h->flags & P_RLEAF) {
|
|
t->bt_cur.page = h;
|
|
t->bt_cur.index = recno - total;
|
|
return (&t->bt_cur);
|
|
}
|
|
for (index = 0, top = NEXTINDEX(h);;) {
|
|
r = GETRINTERNAL(h, index);
|
|
if (++index == top || total + r->nrecs > recno)
|
|
break;
|
|
total += r->nrecs;
|
|
}
|
|
|
|
BT_PUSH(t, pg, index - 1);
|
|
|
|
pg = r->pgno;
|
|
switch (op) {
|
|
case SDELETE:
|
|
--GETRINTERNAL(h, (index - 1))->nrecs;
|
|
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
|
|
break;
|
|
case SINSERT:
|
|
++GETRINTERNAL(h, (index - 1))->nrecs;
|
|
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
|
|
break;
|
|
case SEARCH:
|
|
mpool_put(t->bt_mp, h, 0);
|
|
break;
|
|
}
|
|
|
|
}
|
|
/* Try and recover the tree. */
|
|
err: sverrno = errno;
|
|
if (op != SEARCH)
|
|
while ((parent = BT_POP(t)) != NULL) {
|
|
if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
|
|
break;
|
|
if (op == SINSERT)
|
|
--GETRINTERNAL(h, parent->index)->nrecs;
|
|
else
|
|
++GETRINTERNAL(h, parent->index)->nrecs;
|
|
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
|
|
}
|
|
errno = sverrno;
|
|
return (NULL);
|
|
}
|