1 | #include "port_before.h" |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1990, 1993, 1994 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Mike Olson. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 4. Neither the name of the University nor the names of its contributors |
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19 | * may be used to endorse or promote products derived from this software |
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20 | * without specific prior written permission. |
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21 | * |
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22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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32 | * SUCH DAMAGE. |
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33 | */ |
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34 | |
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35 | #if defined(LIBC_SCCS) && !defined(lint) |
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36 | static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94"; |
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37 | #endif /* LIBC_SCCS and not lint */ |
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38 | #include <sys/cdefs.h> |
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39 | __FBSDID("$FreeBSD$"); |
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40 | |
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41 | #include <sys/types.h> |
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42 | |
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43 | #include <errno.h> |
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44 | #include <stddef.h> |
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45 | #include <stdio.h> |
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46 | |
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47 | #include <db.h> |
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48 | #include "btree.h" |
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49 | |
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50 | /* |
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51 | * __BT_GET -- Get a record from the btree. |
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52 | * |
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53 | * Parameters: |
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54 | * dbp: pointer to access method |
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55 | * key: key to find |
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56 | * data: data to return |
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57 | * flag: currently unused |
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58 | * |
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59 | * Returns: |
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60 | * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. |
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61 | */ |
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62 | int |
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63 | __bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags) |
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64 | { |
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65 | BTREE *t; |
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66 | EPG *e; |
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67 | int exact, status; |
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68 | |
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69 | t = dbp->internal; |
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70 | |
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71 | /* Toss any page pinned across calls. */ |
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72 | if (t->bt_pinned != NULL) { |
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73 | mpool_put(t->bt_mp, t->bt_pinned, 0); |
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74 | t->bt_pinned = NULL; |
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75 | } |
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76 | |
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77 | /* Get currently doesn't take any flags. */ |
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78 | if (flags) { |
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79 | errno = EINVAL; |
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80 | return (RET_ERROR); |
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81 | } |
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82 | |
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83 | if ((e = __bt_search(t, key, &exact)) == NULL) |
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84 | return (RET_ERROR); |
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85 | if (!exact) { |
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86 | mpool_put(t->bt_mp, e->page, 0); |
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87 | return (RET_SPECIAL); |
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88 | } |
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89 | |
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90 | status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); |
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91 | |
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92 | /* |
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93 | * If the user is doing concurrent access, we copied the |
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94 | * key/data, toss the page. |
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95 | */ |
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96 | if (F_ISSET(t, B_DB_LOCK)) |
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97 | mpool_put(t->bt_mp, e->page, 0); |
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98 | else |
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99 | t->bt_pinned = e->page; |
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100 | return (status); |
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101 | } |
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