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-rw-r--r--src/findkey.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/src/findkey.c b/src/findkey.c
index 7638b04..bd9fd83 100644
--- a/src/findkey.c
+++ b/src/findkey.c
@@ -1,65 +1,85 @@
1/* findkey.c - The routine that finds a key entry in the file. */ 1/* findkey.c - The routine that finds a key entry in the file. */
2 2
3/* This file is part of GDBM, the GNU data base manager. 3/* This file is part of GDBM, the GNU data base manager.
4 Copyright (C) 1990-1991, 1993, 2007, 2011, 2013, 2016-2018 Free 4 Copyright (C) 1990-1991, 1993, 2007, 2011, 2013, 2016-2018 Free
5 Software Foundation, Inc. 5 Software Foundation, Inc.
6 6
7 GDBM is free software; you can redistribute it and/or modify 7 GDBM is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option) 9 the Free Software Foundation; either version 3, or (at your option)
10 any later version. 10 any later version.
11 11
12 GDBM is distributed in the hope that it will be useful, 12 GDBM is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details. 15 GNU General Public License for more details.
16 16
17 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License
18 along with GDBM. If not, see <http://www.gnu.org/licenses/>. */ 18 along with GDBM. If not, see <http://www.gnu.org/licenses/>. */
19 19
20/* Include system configuration before all else. */ 20/* Include system configuration before all else. */
21#include "autoconf.h" 21#include "autoconf.h"
22 22
23#include "gdbmdefs.h" 23#include "gdbmdefs.h"
24 24
25int
26gdbm_bucket_element_valid_p (GDBM_FILE dbf, int elem_loc)
27{
28 return
29 elem_loc < dbf->header->bucket_elems
30 && dbf->bucket->h_table[elem_loc].hash_value != -1
31 && dbf->bucket->h_table[elem_loc].key_size >= 0
32 && off_t_sum_ok (dbf->bucket->h_table[elem_loc].data_pointer,
33 dbf->bucket->h_table[elem_loc].key_size)
34 && dbf->bucket->h_table[elem_loc].data_size >= 0
35 && off_t_sum_ok (dbf->bucket->h_table[elem_loc].data_pointer
36 + dbf->bucket->h_table[elem_loc].key_size,
37 dbf->bucket->h_table[elem_loc].data_size);
38}
25 39
26/* Read the data found in bucket entry ELEM_LOC in file DBF and 40/* Read the data found in bucket entry ELEM_LOC in file DBF and
27 return a pointer to it. Also, cache the read value. */ 41 return a pointer to it. Also, cache the read value. */
28 42
29char * 43char *
30_gdbm_read_entry (GDBM_FILE dbf, int elem_loc) 44_gdbm_read_entry (GDBM_FILE dbf, int elem_loc)
31{ 45{
32 int rc; 46 int rc;
33 int key_size; 47 int key_size;
34 int data_size; 48 int data_size;
35 off_t file_pos; 49 off_t file_pos;
36 data_cache_elem *data_ca; 50 data_cache_elem *data_ca;
37 51
38 /* Is it already in the cache? */ 52 /* Is it already in the cache? */
39 if (dbf->cache_entry->ca_data.elem_loc == elem_loc) 53 if (dbf->cache_entry->ca_data.elem_loc == elem_loc)
40 return dbf->cache_entry->ca_data.dptr; 54 return dbf->cache_entry->ca_data.dptr;
41 55
56 if (!gdbm_bucket_element_valid_p (dbf, elem_loc))
57 {
58 GDBM_SET_ERRNO (dbf, GDBM_BAD_HASH_TABLE, TRUE);
59 return NULL;
60 }
61
42 /* Set sizes and pointers. */ 62 /* Set sizes and pointers. */
43 key_size = dbf->bucket->h_table[elem_loc].key_size; 63 key_size = dbf->bucket->h_table[elem_loc].key_size;
44 data_size = dbf->bucket->h_table[elem_loc].data_size; 64 data_size = dbf->bucket->h_table[elem_loc].data_size;
45 data_ca = &dbf->cache_entry->ca_data; 65 data_ca = &dbf->cache_entry->ca_data;
46 66
47 /* Set up the cache. */ 67 /* Set up the cache. */
48 if (data_ca->dptr != NULL) free (data_ca->dptr); 68 if (data_ca->dptr != NULL) free (data_ca->dptr);
49 data_ca->key_size = key_size; 69 data_ca->key_size = key_size;
50 data_ca->data_size = data_size; 70 data_ca->data_size = data_size;
51 data_ca->elem_loc = elem_loc; 71 data_ca->elem_loc = elem_loc;
52 data_ca->hash_val = dbf->bucket->h_table[elem_loc].hash_value; 72 data_ca->hash_val = dbf->bucket->h_table[elem_loc].hash_value;
53 73
54 if (GDBM_DEBUG_HOOK ("_gdbm_read_entry:malloc-failure")) 74 if (GDBM_DEBUG_HOOK ("_gdbm_read_entry:malloc-failure"))
55 data_ca->dptr = NULL; 75 data_ca->dptr = NULL;
56 else if (key_size + data_size == 0) 76 else if (key_size + data_size == 0)
57 data_ca->dptr = (char *) malloc (1); 77 data_ca->dptr = (char *) malloc (1);
58 else 78 else
59 data_ca->dptr = (char *) malloc (key_size + data_size); 79 data_ca->dptr = (char *) malloc (key_size + data_size);
60 if (data_ca->dptr == NULL) 80 if (data_ca->dptr == NULL)
61 { 81 {
62 GDBM_SET_ERRNO2 (dbf, GDBM_MALLOC_ERROR, FALSE, GDBM_DEBUG_LOOKUP); 82 GDBM_SET_ERRNO2 (dbf, GDBM_MALLOC_ERROR, FALSE, GDBM_DEBUG_LOOKUP);
63 _gdbm_fatal (dbf, _("malloc error")); 83 _gdbm_fatal (dbf, _("malloc error"));
64 return NULL; 84 return NULL;
65 } 85 }

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