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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/db/recno/rec_delete.c	Lines:	0	47	0.0 %
Date:	2017-11-07	Branches:	0	31	0.0 %


/*	$OpenBSD: rec_delete.c,v 1.10 2005/08/05 13:03:00 espie Exp $	*/

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Olson.
 *
 * 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.
 */

#include <sys/types.h>

#include <errno.h>
#include <stdio.h>
#include <string.h>

#include <db.h>
#include "recno.h"

static int rec_rdelete(BTREE *, recno_t);

/*
 * __REC_DELETE -- Delete the item(s) referenced by a key.
 *
 * Parameters:
 *	dbp:	pointer to access method
 *	key:	key to delete
 *	flags:	R_CURSOR if deleting what the cursor references
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
 */
int
__rec_delete(const DB *dbp, const DBT *key, u_int flags)
{
	BTREE *t;
	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;
	}

	switch(flags) {
	case 0:
		if ((nrec = *(recno_t *)key->data) == 0)
			goto einval;
		if (nrec > t->bt_nrecs)
			return (RET_SPECIAL);
		--nrec;
		status = rec_rdelete(t, nrec);
		break;
	case R_CURSOR:
		if (!F_ISSET(&t->bt_cursor, CURS_INIT))
			goto einval;
		if (t->bt_nrecs == 0)
			return (RET_SPECIAL);
		status = rec_rdelete(t, t->bt_cursor.rcursor - 1);
		if (status == RET_SUCCESS)
			--t->bt_cursor.rcursor;
		break;
	default:
einval:		errno = EINVAL;
		return (RET_ERROR);
	}

	if (status == RET_SUCCESS)
		F_SET(t, B_MODIFIED | R_MODIFIED);
	return (status);
}

/*
 * REC_RDELETE -- Delete the data matching the specified key.
 *
 * Parameters:
 *	tree:	tree
 *	nrec:	record to delete
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
 */
static int
rec_rdelete(BTREE *t, recno_t nrec)
{
	EPG *e;
	PAGE *h;
	int status;

	/* Find the record; __rec_search pins the page. */
	if ((e = __rec_search(t, nrec, SDELETE)) == NULL)
		return (RET_ERROR);

	/* Delete the record. */
	h = e->page;
	status = __rec_dleaf(t, h, e->index);
	if (status != RET_SUCCESS) {
		mpool_put(t->bt_mp, h, 0);
		return (status);
	}
	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
	return (RET_SUCCESS);
}

/*
 * __REC_DLEAF -- Delete a single record from a recno leaf page.
 *
 * Parameters:
 *	t:	tree
 *	idx:	index on current page to delete
 *
 * Returns:
 *	RET_SUCCESS, RET_ERROR.
 */
int
__rec_dleaf(BTREE *t, PAGE *h, u_int32_t idx)
{
	RLEAF *rl;
	indx_t *ip, cnt, offset;
	u_int32_t nbytes;
	char *from;
	void *to;

	/*
	 * Delete a record from a recno leaf page.  Internal records are never
	 * deleted from internal pages, regardless of the records that caused
	 * them to be added being deleted.  Pages made empty by deletion are
	 * not reclaimed.  They are, however, made available for reuse.
	 *
	 * Pack the remaining entries at the end of the page, shift the indices
	 * down, overwriting the deleted record and its index.  If the record
	 * uses overflow pages, make them available for reuse.
	 */
	to = rl = GETRLEAF(h, idx);
	if (rl->flags & P_BIGDATA && __ovfl_delete(t, rl->bytes) == RET_ERROR)
		return (RET_ERROR);
	nbytes = NRLEAF(rl);

	/*
	 * Compress the key/data pairs.  Compress and adjust the [BR]LEAF
	 * offsets.  Reset the headers.
	 */
	from = (char *)h + h->upper;
	memmove(from + nbytes, from, (char *)to - from);
	h->upper += nbytes;

	offset = h->linp[idx];
	for (cnt = &h->linp[idx] - (ip = &h->linp[0]); cnt--; ++ip)
		if (ip[0] < offset)
			ip[0] += nbytes;
	for (cnt = &h->linp[NEXTINDEX(h)] - ip; --cnt; ++ip)
		ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
	h->lower -= sizeof(indx_t);
	--t->bt_nrecs;
	return (RET_SUCCESS);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: rec_delete.c,v 1.10 2005/08/05 13:03:00 espie Exp $ */
2
3			/*-
4			* Copyright (c) 1990, 1993, 1994
5			* The Regents of the University of California. All rights reserved.
6			*
7			* This code is derived from software contributed to Berkeley by
8			* Mike Olson.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			* 3. Neither the name of the University nor the names of its contributors
19			* may be used to endorse or promote products derived from this software
20			* without specific prior written permission.
21			*
22			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32			* SUCH DAMAGE.
33			*/
34
35			#include <sys/types.h>
36
37			#include <errno.h>
38			#include <stdio.h>
39			#include <string.h>
40
41			#include <db.h>
42			#include "recno.h"
43
44			static int rec_rdelete(BTREE *, recno_t);
45
46			/*
47			* __REC_DELETE -- Delete the item(s) referenced by a key.
48			*
49			* Parameters:
50			* dbp: pointer to access method
51			* key: key to delete
52			* flags: R_CURSOR if deleting what the cursor references
53			*
54			* Returns:
55			* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
56			*/
57			int
58			__rec_delete(const DB dbp, const DBT key, u_int flags)
59			{
60			BTREE *t;
61			recno_t nrec;
62			int status;
63
64			t = dbp->internal;
65
66			/* Toss any page pinned across calls. */
67			if (t->bt_pinned != NULL) {
68			mpool_put(t->bt_mp, t->bt_pinned, 0);
69			t->bt_pinned = NULL;
70			}
71
72			switch(flags) {
73			case 0:
74			if ((nrec = (recno_t )key->data) == 0)
75			goto einval;
76			if (nrec > t->bt_nrecs)
77			return (RET_SPECIAL);
78			--nrec;
79			status = rec_rdelete(t, nrec);
80			break;
81			case R_CURSOR:
82			if (!F_ISSET(&t->bt_cursor, CURS_INIT))
83			goto einval;
84			if (t->bt_nrecs == 0)
85			return (RET_SPECIAL);
86			status = rec_rdelete(t, t->bt_cursor.rcursor - 1);
87			if (status == RET_SUCCESS)
88			--t->bt_cursor.rcursor;
89			break;
90			default:
91			einval: errno = EINVAL;
92			return (RET_ERROR);
93			}
94
95			if (status == RET_SUCCESS)
96			F_SET(t, B_MODIFIED \| R_MODIFIED);
97			return (status);
98			}
99
100			/*
101			* REC_RDELETE -- Delete the data matching the specified key.
102			*
103			* Parameters:
104			* tree: tree
105			* nrec: record to delete
106			*
107			* Returns:
108			* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
109			*/
110			static int
111			rec_rdelete(BTREE *t, recno_t nrec)
112			{
113			EPG *e;
114			PAGE *h;
115			int status;
116
117			/* Find the record; __rec_search pins the page. */
118			if ((e = __rec_search(t, nrec, SDELETE)) == NULL)
119			return (RET_ERROR);
120
121			/* Delete the record. */
122			h = e->page;
123			status = __rec_dleaf(t, h, e->index);
124			if (status != RET_SUCCESS) {
125			mpool_put(t->bt_mp, h, 0);
126			return (status);
127			}
128			mpool_put(t->bt_mp, h, MPOOL_DIRTY);
129			return (RET_SUCCESS);
130			}
131
132			/*
133			* __REC_DLEAF -- Delete a single record from a recno leaf page.
134			*
135			* Parameters:
136			* t: tree
137			* idx: index on current page to delete
138			*
139			* Returns:
140			* RET_SUCCESS, RET_ERROR.
141			*/
142			int
143			__rec_dleaf(BTREE t, PAGE h, u_int32_t idx)
144			{
145			RLEAF *rl;
146			indx_t *ip, cnt, offset;
147			u_int32_t nbytes;
148			char *from;
149			void *to;
150
151			/*
152			* Delete a record from a recno leaf page. Internal records are never
153			* deleted from internal pages, regardless of the records that caused
154			* them to be added being deleted. Pages made empty by deletion are
155			* not reclaimed. They are, however, made available for reuse.
156			*
157			* Pack the remaining entries at the end of the page, shift the indices
158			* down, overwriting the deleted record and its index. If the record
159			* uses overflow pages, make them available for reuse.
160			*/
161			to = rl = GETRLEAF(h, idx);
162			if (rl->flags & P_BIGDATA && __ovfl_delete(t, rl->bytes) == RET_ERROR)
163			return (RET_ERROR);
164			nbytes = NRLEAF(rl);
165
166			/*
167			* Compress the key/data pairs. Compress and adjust the [BR]LEAF
168			* offsets. Reset the headers.
169			*/
170			from = (char *)h + h->upper;
171			memmove(from + nbytes, from, (char *)to - from);
172			h->upper += nbytes;
173
174			offset = h->linp[idx];
175			for (cnt = &h->linp[idx] - (ip = &h->linp[0]); cnt--; ++ip)
176			if (ip[0] < offset)
177			ip[0] += nbytes;
178			for (cnt = &h->linp[NEXTINDEX(h)] - ip; --cnt; ++ip)
179			ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
180			h->lower -= sizeof(indx_t);
181			--t->bt_nrecs;
182			return (RET_SUCCESS);
183			}