[18019] | 1 | /* gdbmreorg.c - Reorganize the database file. */
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| 2 |
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| 3 | /* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
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| 4 | Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
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| 5 |
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| 6 | GDBM is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GDBM is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GDBM; see the file COPYING. If not, write to
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| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 |
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| 20 | You may contact the author by:
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| 21 | e-mail: [email protected]
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| 22 | us-mail: Philip A. Nelson
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| 23 | Computer Science Department
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| 24 | Western Washington University
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| 25 | Bellingham, WA 98226
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| 26 |
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| 27 | ************************************************************************/
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| 28 |
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| 29 |
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| 30 | /* include system configuration before all else. */
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| 31 | #include "autoconf.h"
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| 32 |
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| 33 | #include "gdbmdefs.h"
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| 34 | #include "gdbmerrno.h"
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| 35 | #include "extern.h"
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| 36 |
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| 37 | #if !HAVE_RENAME
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| 38 |
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| 39 | /* Rename takes OLD_NAME and renames it as NEW_NAME. If it can not rename
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| 40 | the file a non-zero value is returned. OLD_NAME is guaranteed to
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| 41 | remain if it can't be renamed. It assumes NEW_NAME always exists (due
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| 42 | to being used in gdbm). */
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| 43 |
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| 44 | static int
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| 45 | _gdbm_rename (old_name, new_name)
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| 46 | char* old_name;
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| 47 | char* new_name;
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| 48 | {
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| 49 | if (unlink (new_name) != 0)
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| 50 | return -1;
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| 51 |
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| 52 | if (link (old_name, new_name) != 0)
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| 53 | return -1;
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| 54 |
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| 55 | unlink (old_name);
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| 56 | return 0;
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| 57 |
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| 58 | }
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| 59 |
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| 60 | #define rename _gdbm_rename
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| 61 | #endif
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| 62 |
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| 63 |
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| 64 |
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| 65 | /* Reorganize the database. This requires creating a new file and inserting
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| 66 | all the elements in the old file DBF into the new file. The new file
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| 67 | is then renamed to the same name as the old file and DBF is updated to
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| 68 | contain all the correct information about the new file. If an error
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| 69 | is detected, the return value is negative. The value zero is returned
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| 70 | after a successful reorganization. */
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| 71 |
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| 72 | int
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| 73 | gdbm_reorganize (dbf)
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| 74 | gdbm_file_info *dbf;
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| 75 |
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| 76 | {
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| 77 | gdbm_file_info *new_dbf; /* The new file. */
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| 78 | char *new_name; /* A temporary name. */
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| 79 | int len; /* Used in new_name construction. */
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| 80 | datum key, nextkey, data; /* For the sequential sweep. */
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| 81 | struct stat fileinfo; /* Information about the file. */
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| 82 | int index; /* Use in moving the bucket cache. */
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| 83 |
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| 84 |
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| 85 | /* Readers can not reorganize! */
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| 86 | if (dbf->read_write == GDBM_READER)
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| 87 | {
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| 88 | gdbm_errno = GDBM_READER_CANT_REORGANIZE;
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| 89 | return -1;
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| 90 | }
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| 91 |
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| 92 | /* Initialize the gdbm_errno variable. */
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| 93 | gdbm_errno = GDBM_NO_ERROR;
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| 94 |
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| 95 | /* Construct new name for temporary file. */
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| 96 | len = strlen (dbf->name);
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| 97 | new_name = (char *) malloc (len + 3);
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| 98 | if (new_name == NULL)
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| 99 | {
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| 100 | gdbm_errno = GDBM_MALLOC_ERROR;
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| 101 | return -1;
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| 102 | }
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| 103 | strcpy (&new_name[0], dbf->name);
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| 104 | new_name[len+2] = 0;
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| 105 | new_name[len+1] = '#';
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| 106 | while ( (len > 0) && new_name[len-1] != '/')
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| 107 | {
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| 108 | new_name[len] = new_name[len-1];
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| 109 | len -= 1;
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| 110 | }
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| 111 | new_name[len] = '#';
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| 112 |
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| 113 | /* Get the mode for the old file and open the new database. */
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| 114 | fstat (dbf->desc, &fileinfo);
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[22259] | 115 | #ifdef MSDOS
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| 116 | /* Not clear if final argument for Windows should be to obtain a
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| 117 | file lock or not. Play it safe for now and ask for a lock
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| 118 | */
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[18019] | 119 | new_dbf = gdbm_open (new_name, dbf->header->block_size, GDBM_WRCREAT,
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[22259] | 120 | fileinfo.st_mode, dbf->fatal_err,dbf->need_filelock);
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| 121 | #else
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| 122 | new_dbf = gdbm_open (new_name, dbf->header->block_size, GDBM_WRCREAT,
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[18019] | 123 | fileinfo.st_mode, dbf->fatal_err);
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[22259] | 124 | #endif
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[18019] | 125 |
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| 126 | if (new_dbf == NULL)
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| 127 | {
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| 128 | free (new_name);
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| 129 | gdbm_errno = GDBM_REORGANIZE_FAILED;
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| 130 | return -1;
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| 131 | }
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| 132 |
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| 133 |
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| 134 | /* For each item in the old database, add an entry in the new. */
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| 135 | key = gdbm_firstkey (dbf);
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| 136 |
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| 137 | while (key.dptr != NULL)
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| 138 | {
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| 139 | data = gdbm_fetch (dbf, key);
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| 140 | if (data.dptr != NULL)
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| 141 | {
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| 142 | /* Add the data to the new file. */
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| 143 | if (gdbm_store (new_dbf, key, data, GDBM_INSERT) != 0)
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| 144 | {
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| 145 | gdbm_close (new_dbf);
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| 146 | gdbm_errno = GDBM_REORGANIZE_FAILED;
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| 147 | unlink (new_name);
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| 148 | free (new_name);
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| 149 | return -1;
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| 150 | }
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| 151 | }
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| 152 | else
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| 153 | {
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| 154 | /* ERROR! Abort and don't finish reorganize. */
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| 155 | gdbm_close (new_dbf);
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| 156 | gdbm_errno = GDBM_REORGANIZE_FAILED;
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| 157 | unlink (new_name);
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| 158 | free (new_name);
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| 159 | return -1;
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| 160 | }
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| 161 | nextkey = gdbm_nextkey (dbf, key);
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| 162 | free (key.dptr);
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| 163 | free (data.dptr);
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| 164 | key = nextkey;
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| 165 | }
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| 166 |
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| 167 | /* Write everything. */
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| 168 | _gdbm_end_update (new_dbf);
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| 169 | gdbm_sync (new_dbf);
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| 170 |
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| 171 |
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| 172 | /* Move the new file to old name. */
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| 173 |
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[18060] | 174 | #ifdef MSDOS
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| 175 | if (close (new_dbf->desc)
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| 176 | || unlink (dbf->name)
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| 177 | || rename (new_name, dbf->name)
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| 178 | || (new_dbf->desc = open (dbf->name, O_RDWR|O_BINARY)) < 0)
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| 179 | #else /* not MSDOS */
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[18019] | 180 | if (rename (new_name, dbf->name) != 0)
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[18060] | 181 | #endif /* not MSDOS */
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[18019] | 182 | {
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| 183 | gdbm_errno = GDBM_REORGANIZE_FAILED;
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| 184 | gdbm_close (new_dbf);
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| 185 | free (new_name);
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| 186 | return -1;
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| 187 | }
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| 188 |
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| 189 | /* Fix up DBF to have the correct information for the new file. */
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| 190 | if (dbf->file_locking)
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| 191 | {
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[18074] | 192 | #ifdef MSDOS
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| 193 | if (dbf->need_filelock) {
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| 194 | UNLOCK_FILE(dbf);
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| 195 | }
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| 196 | #else
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[18019] | 197 | UNLOCK_FILE(dbf);
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[18074] | 198 | #endif
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[18019] | 199 | }
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| 200 | close (dbf->desc);
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| 201 | free (dbf->header);
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| 202 | free (dbf->dir);
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| 203 |
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| 204 | if (dbf->bucket_cache != NULL) {
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| 205 | for (index = 0; index < dbf->cache_size; index++) {
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| 206 | if (dbf->bucket_cache[index].ca_bucket != NULL)
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| 207 | free (dbf->bucket_cache[index].ca_bucket);
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| 208 | if (dbf->bucket_cache[index].ca_data.dptr != NULL)
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| 209 | free (dbf->bucket_cache[index].ca_data.dptr);
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| 210 | }
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| 211 | free (dbf->bucket_cache);
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| 212 | }
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| 213 |
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| 214 | dbf->desc = new_dbf->desc;
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| 215 | dbf->header = new_dbf->header;
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| 216 | dbf->dir = new_dbf->dir;
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| 217 | dbf->bucket = new_dbf->bucket;
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| 218 | dbf->bucket_dir = new_dbf->bucket_dir;
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| 219 | dbf->last_read = new_dbf->last_read;
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| 220 | dbf->bucket_cache = new_dbf->bucket_cache;
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| 221 | dbf->cache_size = new_dbf->cache_size;
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| 222 | dbf->header_changed = new_dbf->header_changed;
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| 223 | dbf->directory_changed = new_dbf->directory_changed;
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| 224 | dbf->bucket_changed = new_dbf->bucket_changed;
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| 225 | dbf->second_changed = new_dbf->second_changed;
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| 226 |
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| 227 | free (new_dbf->name);
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| 228 | free (new_dbf);
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| 229 | free (new_name);
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| 230 |
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| 231 | /* Make sure the new database is all on disk. */
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| 232 | fsync (dbf->desc);
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| 233 |
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| 234 | /* Force the right stuff for a correct bucket cache. */
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| 235 | dbf->cache_entry = &dbf->bucket_cache[0];
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| 236 | _gdbm_get_bucket (dbf, 0);
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| 237 |
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| 238 | return 0;
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| 239 | }
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