298 lines
6.7 KiB
C
298 lines
6.7 KiB
C
/*-
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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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* 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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#if defined(LIBC_SCCS) && !defined(lint)
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/* from: static char sccsid[] = "@(#)rec_get.c 8.2 (Berkeley) 9/7/93"; */
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static char *rcsid = "$Id: rec_get.c,v 1.4 1993/09/09 02:42:23 cgd Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <db.h>
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#include "recno.h"
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/*
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* __REC_GET -- Get a record from the btree.
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*
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* Parameters:
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* dbp: pointer to access method
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* key: key to find
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* data: data to return
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* flag: currently unused
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
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*/
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int
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__rec_get(dbp, key, data, flags)
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const DB *dbp;
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const DBT *key;
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DBT *data;
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u_int flags;
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{
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BTREE *t;
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EPG *e;
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recno_t nrec;
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int status;
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t = dbp->internal;
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/* Toss any page pinned across calls. */
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if (t->bt_pinned != NULL) {
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mpool_put(t->bt_mp, t->bt_pinned, 0);
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t->bt_pinned = NULL;
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}
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/* Get currently doesn't take any flags, and keys of 0 are illegal. */
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if (flags || (nrec = *(recno_t *)key->data) == 0) {
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errno = EINVAL;
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return (RET_ERROR);
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}
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/*
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* If we haven't seen this record yet, try to find it in the
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* original file.
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*/
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if (nrec > t->bt_nrecs) {
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if (ISSET(t, R_EOF | R_INMEM))
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return (RET_SPECIAL);
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if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
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return (status);
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}
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--nrec;
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if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
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return (RET_ERROR);
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status = __rec_ret(t, e, 0, NULL, data);
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if (ISSET(t, B_DB_LOCK))
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mpool_put(t->bt_mp, e->page, 0);
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else
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t->bt_pinned = e->page;
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return (status);
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}
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/*
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* __REC_FPIPE -- Get fixed length records from a pipe.
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*
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* Parameters:
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* t: tree
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* cnt: records to read
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__rec_fpipe(t, top)
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BTREE *t;
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recno_t top;
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{
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DBT data;
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recno_t nrec;
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size_t len;
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int ch;
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char *p;
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data.data = t->bt_dbuf;
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data.size = t->bt_reclen;
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if (t->bt_dbufsz < t->bt_reclen) {
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if ((t->bt_dbuf = realloc(t->bt_dbuf, t->bt_reclen)) == NULL)
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return (RET_ERROR);
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t->bt_dbufsz = t->bt_reclen;
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}
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for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
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len = t->bt_reclen;
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for (p = t->bt_dbuf;; *p++ = ch)
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if ((ch = getc(t->bt_rfp)) == EOF || !len--) {
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if (__rec_iput(t, nrec, &data, 0)
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!= RET_SUCCESS)
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return (RET_ERROR);
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break;
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}
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if (ch == EOF)
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break;
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}
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if (nrec < top) {
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SET(t, R_EOF);
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return (RET_SPECIAL);
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}
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return (RET_SUCCESS);
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}
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/*
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* __REC_VPIPE -- Get variable length records from a pipe.
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*
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* Parameters:
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* t: tree
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* cnt: records to read
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__rec_vpipe(t, top)
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BTREE *t;
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recno_t top;
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{
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DBT data;
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recno_t nrec;
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indx_t len;
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size_t sz;
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int bval, ch;
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char *p;
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bval = t->bt_bval;
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for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
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for (p = t->bt_dbuf, sz = t->bt_dbufsz;; *p++ = ch, --sz) {
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if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
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data.data = t->bt_dbuf;
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data.size = p - t->bt_dbuf;
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if (ch == EOF && data.size == 0)
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break;
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if (__rec_iput(t, nrec, &data, 0)
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!= RET_SUCCESS)
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return (RET_ERROR);
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break;
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}
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if (sz == 0) {
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len = p - t->bt_dbuf;
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t->bt_dbufsz += (sz = 256);
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if ((t->bt_dbuf =
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realloc(t->bt_dbuf, t->bt_dbufsz)) == NULL)
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return (RET_ERROR);
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p = t->bt_dbuf + len;
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}
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}
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if (ch == EOF)
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break;
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}
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if (nrec < top) {
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SET(t, R_EOF);
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return (RET_SPECIAL);
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}
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return (RET_SUCCESS);
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}
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/*
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* __REC_FMAP -- Get fixed length records from a file.
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*
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* Parameters:
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* t: tree
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* cnt: records to read
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__rec_fmap(t, top)
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BTREE *t;
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recno_t top;
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{
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DBT data;
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recno_t nrec;
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caddr_t sp, ep;
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size_t len;
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char *p;
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sp = t->bt_cmap;
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ep = t->bt_emap;
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data.data = t->bt_dbuf;
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data.size = t->bt_reclen;
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if (t->bt_dbufsz < t->bt_reclen) {
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if ((t->bt_dbuf = realloc(t->bt_dbuf, t->bt_reclen)) == NULL)
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return (RET_ERROR);
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t->bt_dbufsz = t->bt_reclen;
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}
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for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
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if (sp >= ep) {
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SET(t, R_EOF);
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return (RET_SPECIAL);
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}
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len = t->bt_reclen;
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for (p = t->bt_dbuf; sp < ep && len--; *p++ = *sp++);
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memset(p, t->bt_bval, len);
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if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
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return (RET_ERROR);
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}
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t->bt_cmap = sp;
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return (RET_SUCCESS);
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}
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/*
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* __REC_VMAP -- Get variable length records from a file.
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*
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* Parameters:
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* t: tree
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* cnt: records to read
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__rec_vmap(t, top)
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BTREE *t;
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recno_t top;
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{
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DBT data;
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caddr_t sp, ep;
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recno_t nrec;
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int bval;
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sp = t->bt_cmap;
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ep = t->bt_emap;
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bval = t->bt_bval;
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for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
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if (sp >= ep) {
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SET(t, R_EOF);
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return (RET_SPECIAL);
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}
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for (data.data = sp; sp < ep && *sp != bval; ++sp);
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data.size = sp - (caddr_t)data.data;
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if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
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return (RET_ERROR);
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++sp;
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}
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t->bt_cmap = sp;
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return (RET_SUCCESS);
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}
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