306 lines
7.1 KiB
C
306 lines
7.1 KiB
C
/* $NetBSD: rec_get.c,v 1.16 2008/09/11 12:58:00 joerg Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1990, 1993, 1994
|
|
* 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. 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 HAVE_NBTOOL_CONFIG_H
|
|
#include "nbtool_config.h"
|
|
#endif
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef __minix
|
|
__RCSID("$NetBSD: rec_get.c,v 1.16 2008/09/11 12:58:00 joerg Exp $");
|
|
#endif
|
|
|
|
#ifndef __minix
|
|
#include "namespace.h"
|
|
#endif
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <db.h>
|
|
#include "recno.h"
|
|
|
|
/*
|
|
* __REC_GET -- Get a record from the btree.
|
|
*
|
|
* Parameters:
|
|
* dbp: pointer to access method
|
|
* key: key to find
|
|
* data: data to return
|
|
* flag: currently unused
|
|
*
|
|
* Returns:
|
|
* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
|
|
*/
|
|
int
|
|
__rec_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
|
|
{
|
|
BTREE *t;
|
|
EPG *e;
|
|
recno_t nrec;
|
|
int status;
|
|
|
|
t = dbp->internal;
|
|
|
|
/* Toss any page pinned across calls. */
|
|
if (t->bt_pinned != NULL) {
|
|
mpool_put(t->bt_mp, t->bt_pinned, 0);
|
|
t->bt_pinned = NULL;
|
|
}
|
|
|
|
/* Get currently doesn't take any flags, and keys of 0 are illegal. */
|
|
if (flags || (nrec = *(recno_t *)key->data) == 0) {
|
|
errno = EINVAL;
|
|
return (RET_ERROR);
|
|
}
|
|
|
|
/*
|
|
* If we haven't seen this record yet, try to find it in the
|
|
* original file.
|
|
*/
|
|
if (nrec > t->bt_nrecs) {
|
|
if (F_ISSET(t, R_EOF | R_INMEM))
|
|
return (RET_SPECIAL);
|
|
if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
|
|
return (status);
|
|
}
|
|
|
|
--nrec;
|
|
if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
|
|
return (RET_ERROR);
|
|
|
|
status = __rec_ret(t, e, 0, NULL, data);
|
|
if (F_ISSET(t, B_DB_LOCK))
|
|
mpool_put(t->bt_mp, e->page, 0);
|
|
else
|
|
t->bt_pinned = e->page;
|
|
return (status);
|
|
}
|
|
|
|
/*
|
|
* __REC_FPIPE -- Get fixed length records from a pipe.
|
|
*
|
|
* Parameters:
|
|
* t: tree
|
|
* cnt: records to read
|
|
*
|
|
* Returns:
|
|
* RET_ERROR, RET_SUCCESS
|
|
*/
|
|
int
|
|
__rec_fpipe(BTREE *t, recno_t top)
|
|
{
|
|
DBT data;
|
|
recno_t nrec;
|
|
size_t len;
|
|
int ch;
|
|
uint8_t *p;
|
|
|
|
if (t->bt_rdata.size < t->bt_reclen) {
|
|
t->bt_rdata.data = t->bt_rdata.data == NULL ?
|
|
malloc(t->bt_reclen) :
|
|
realloc(t->bt_rdata.data, t->bt_reclen);
|
|
if (t->bt_rdata.data == NULL)
|
|
return (RET_ERROR);
|
|
t->bt_rdata.size = t->bt_reclen;
|
|
}
|
|
data.data = t->bt_rdata.data;
|
|
data.size = t->bt_reclen;
|
|
|
|
for (nrec = t->bt_nrecs; nrec < top;) {
|
|
len = t->bt_reclen;
|
|
for (p = t->bt_rdata.data;; *p++ = ch)
|
|
if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
|
|
if (ch != EOF)
|
|
*p = ch;
|
|
if (len != 0)
|
|
memset(p, t->bt_bval, len);
|
|
if (__rec_iput(t,
|
|
nrec, &data, 0) != RET_SUCCESS)
|
|
return (RET_ERROR);
|
|
++nrec;
|
|
break;
|
|
}
|
|
if (ch == EOF)
|
|
break;
|
|
}
|
|
if (nrec < top) {
|
|
F_SET(t, R_EOF);
|
|
return (RET_SPECIAL);
|
|
}
|
|
return (RET_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* __REC_VPIPE -- Get variable length records from a pipe.
|
|
*
|
|
* Parameters:
|
|
* t: tree
|
|
* cnt: records to read
|
|
*
|
|
* Returns:
|
|
* RET_ERROR, RET_SUCCESS
|
|
*/
|
|
int
|
|
__rec_vpipe(BTREE *t, recno_t top)
|
|
{
|
|
DBT data;
|
|
recno_t nrec;
|
|
ptrdiff_t len;
|
|
size_t sz;
|
|
int bval, ch;
|
|
uint8_t *p;
|
|
|
|
bval = t->bt_bval;
|
|
for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
|
|
for (p = t->bt_rdata.data,
|
|
sz = t->bt_rdata.size;; *p++ = ch, --sz) {
|
|
if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
|
|
data.data = t->bt_rdata.data;
|
|
data.size = p - (uint8_t *)t->bt_rdata.data;
|
|
if (ch == EOF && data.size == 0)
|
|
break;
|
|
if (__rec_iput(t, nrec, &data, 0)
|
|
!= RET_SUCCESS)
|
|
return (RET_ERROR);
|
|
break;
|
|
}
|
|
if (sz == 0) {
|
|
len = p - (uint8_t *)t->bt_rdata.data;
|
|
t->bt_rdata.size += (sz = 256);
|
|
t->bt_rdata.data = t->bt_rdata.data == NULL ?
|
|
malloc(t->bt_rdata.size) :
|
|
realloc(t->bt_rdata.data, t->bt_rdata.size);
|
|
if (t->bt_rdata.data == NULL)
|
|
return (RET_ERROR);
|
|
p = (uint8_t *)t->bt_rdata.data + len;
|
|
}
|
|
}
|
|
if (ch == EOF)
|
|
break;
|
|
}
|
|
if (nrec < top) {
|
|
F_SET(t, R_EOF);
|
|
return (RET_SPECIAL);
|
|
}
|
|
return (RET_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* __REC_FMAP -- Get fixed length records from a file.
|
|
*
|
|
* Parameters:
|
|
* t: tree
|
|
* cnt: records to read
|
|
*
|
|
* Returns:
|
|
* RET_ERROR, RET_SUCCESS
|
|
*/
|
|
int
|
|
__rec_fmap(BTREE *t, recno_t top)
|
|
{
|
|
DBT data;
|
|
recno_t nrec;
|
|
uint8_t *sp, *ep, *p;
|
|
size_t len;
|
|
|
|
if (t->bt_rdata.size < t->bt_reclen) {
|
|
t->bt_rdata.data = t->bt_rdata.data == NULL ?
|
|
malloc(t->bt_reclen) :
|
|
realloc(t->bt_rdata.data, t->bt_reclen);
|
|
if (t->bt_rdata.data == NULL)
|
|
return (RET_ERROR);
|
|
t->bt_rdata.size = t->bt_reclen;
|
|
}
|
|
data.data = t->bt_rdata.data;
|
|
data.size = t->bt_reclen;
|
|
|
|
sp = (uint8_t *)t->bt_cmap;
|
|
ep = (uint8_t *)t->bt_emap;
|
|
for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
|
|
if (sp >= ep) {
|
|
F_SET(t, R_EOF);
|
|
return (RET_SPECIAL);
|
|
}
|
|
len = t->bt_reclen;
|
|
for (p = t->bt_rdata.data;
|
|
sp < ep && len > 0; *p++ = *sp++, --len);
|
|
if (len != 0)
|
|
memset(p, t->bt_bval, len);
|
|
if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
|
|
return (RET_ERROR);
|
|
}
|
|
t->bt_cmap = (caddr_t)sp;
|
|
return (RET_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* __REC_VMAP -- Get variable length records from a file.
|
|
*
|
|
* Parameters:
|
|
* t: tree
|
|
* cnt: records to read
|
|
*
|
|
* Returns:
|
|
* RET_ERROR, RET_SUCCESS
|
|
*/
|
|
int
|
|
__rec_vmap(BTREE *t, recno_t top)
|
|
{
|
|
DBT data;
|
|
uint8_t *sp, *ep;
|
|
recno_t nrec;
|
|
int bval;
|
|
|
|
sp = (uint8_t *)t->bt_cmap;
|
|
ep = (uint8_t *)t->bt_emap;
|
|
bval = t->bt_bval;
|
|
|
|
for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
|
|
if (sp >= ep) {
|
|
F_SET(t, R_EOF);
|
|
return (RET_SPECIAL);
|
|
}
|
|
for (data.data = sp; sp < ep && *sp != bval; ++sp);
|
|
data.size = sp - (uint8_t *)data.data;
|
|
if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
|
|
return (RET_ERROR);
|
|
++sp;
|
|
}
|
|
t->bt_cmap = (caddr_t)sp;
|
|
return (RET_SUCCESS);
|
|
}
|