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rec_utils.c revision 1.7 
      1 /*	$NetBSD: rec_utils.c,v 1.7 1996/05/03 21:38:54 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)rec_utils.c	8.6 (Berkeley) 7/16/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: rec_utils.c,v 1.7 1996/05/03 21:38:54 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/param.h>
     45 
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <string.h>
     49 
     50 #include <db.h>
     51 #include "recno.h"
     52 
     53 /*
     54  * __rec_ret --
     55  *	Build return data.
     56  *
     57  * Parameters:
     58  *	t:	tree
     59  *	e:	key/data pair to be returned
     60  *   nrec:	record number
     61  *    key:	user's key structure
     62  *	data:	user's data structure
     63  *
     64  * Returns:
     65  *	RET_SUCCESS, RET_ERROR.
     66  */
     67 int
     68 __rec_ret(t, e, nrec, key, data)
     69 	BTREE *t;
     70 	EPG *e;
     71 	recno_t nrec;
     72 	DBT *key, *data;
     73 {
     74 	RLEAF *rl;
     75 	void *p;
     76 
     77 	if (key == NULL)
     78 		goto dataonly;
     79 
     80 	/* We have to copy the key, it's not on the page. */
     81 	if (sizeof(recno_t) > t->bt_rkey.size) {
     82 		p = (void *)(t->bt_rkey.data == NULL ?
     83 		    malloc(sizeof(recno_t)) :
     84 		    realloc(t->bt_rkey.data, sizeof(recno_t)));
     85 		if (p == NULL)
     86 			return (RET_ERROR);
     87 		t->bt_rkey.data = p;
     88 		t->bt_rkey.size = sizeof(recno_t);
     89 	}
     90 	memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
     91 	key->size = sizeof(recno_t);
     92 	key->data = t->bt_rkey.data;
     93 
     94 dataonly:
     95 	if (data == NULL)
     96 		return (RET_SUCCESS);
     97 
     98 	/*
     99 	 * We must copy big keys/data to make them contigous.  Otherwise,
    100 	 * leave the page pinned and don't copy unless the user specified
    101 	 * concurrent access.
    102 	 */
    103 	rl = GETRLEAF(e->page, e->index);
    104 	if (rl->flags & P_BIGDATA) {
    105 		if (__ovfl_get(t, rl->bytes,
    106 		    &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
    107 			return (RET_ERROR);
    108 		data->data = t->bt_rdata.data;
    109 	} else if (F_ISSET(t, B_DB_LOCK)) {
    110 		/* Use +1 in case the first record retrieved is 0 length. */
    111 		if (rl->dsize + 1 > t->bt_rdata.size) {
    112 			p = (void *)(t->bt_rdata.data == NULL ?
    113 			    malloc(rl->dsize + 1) :
    114 			    realloc(t->bt_rdata.data, rl->dsize + 1));
    115 			if (p == NULL)
    116 				return (RET_ERROR);
    117 			t->bt_rdata.data = p;
    118 			t->bt_rdata.size = rl->dsize + 1;
    119 		}
    120 		memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
    121 		data->size = rl->dsize;
    122 		data->data = t->bt_rdata.data;
    123 	} else {
    124 		data->size = rl->dsize;
    125 		data->data = rl->bytes;
    126 	}
    127 	return (RET_SUCCESS);
    128 }
    129