/* $OpenBSD: hashed_db.c,v 1.1 2010/01/12 23:22:06 nicm Exp $ */ /**************************************************************************** * Copyright (c) 2006 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ****************************************************************************/ /**************************************************************************** * Author: Thomas E. Dickey 2006 * ****************************************************************************/ #include #include #include #if USE_HASHED_DB MODULE_ID("$Id: hashed_db.c,v 1.1 2010/01/12 23:22:06 nicm Exp $") #if HASHED_DB_API >= 2 static DBC *cursor; #endif /* * Open the database. */ NCURSES_EXPORT(DB *) _nc_db_open(const char *path, bool modify) { DB *result = 0; #if HASHED_DB_API >= 4 db_create(&result, NULL, 0); result->open(result, NULL, path, NULL, DB_HASH, modify ? DB_CREATE : DB_RDONLY, 0644); #elif HASHED_DB_API >= 3 db_create(&result, NULL, 0); result->open(result, path, NULL, DB_HASH, modify ? DB_CREATE : DB_RDONLY, 0644); #elif HASHED_DB_API >= 2 int code; if ((code = db_open(path, DB_HASH, modify ? DB_CREATE : DB_RDONLY, 0644, (DB_ENV *) 0, (DB_INFO *) 0, &result)) != 0) { T(("cannot open %s: %s", path, strerror(code))); result = 0; } else { T(("opened %s", path)); } #else result = dbopen(path, modify ? (O_CREAT | O_RDWR) : O_RDONLY, 0644, DB_HASH, NULL); if (result != 0) { T(("opened %s", path)); } #endif return result; } /* * Close the database. Do not attempt to use the 'db' handle after this call. */ NCURSES_EXPORT(int) _nc_db_close(DB * db) { int result; #if HASHED_DB_API >= 2 result = db->close(db, 0); #else result = db->close(db); #endif return result; } /* * Write a record to the database. * * Returns 0 on success. * * FIXME: the FreeBSD cap_mkdb program assumes the database could have * duplicates. There appears to be no good reason for that (review/fix). */ NCURSES_EXPORT(int) _nc_db_put(DB * db, DBT * key, DBT * data) { int result; #if HASHED_DB_API >= 2 /* remove any pre-existing value, since we do not want duplicates */ (void) db->del(db, NULL, key, 0); result = db->put(db, NULL, key, data, DB_NOOVERWRITE); #else result = db->put(db, key, data, R_NOOVERWRITE); #endif return result; } /* * Read a record from the database. * * Returns 0 on success. */ NCURSES_EXPORT(int) _nc_db_get(DB * db, DBT * key, DBT * data) { int result; memset(data, 0, sizeof(*data)); #if HASHED_DB_API >= 2 result = db->get(db, NULL, key, data, 0); #else result = db->get(db, key, data, 0); #endif return result; } /* * Read the first record from the database, ignoring order. * * Returns 0 on success. */ NCURSES_EXPORT(int) _nc_db_first(DB * db, DBT * key, DBT * data) { int result; memset(key, 0, sizeof(*key)); memset(data, 0, sizeof(*data)); #if HASHED_DB_API >= 2 if ((result = db->cursor(db, NULL, &cursor, 0)) == 0) { result = cursor->c_get(cursor, key, data, DB_FIRST); } #else result = db->seq(db, key, data, 0); #endif return result; } /* * Read the next record from the database, ignoring order. * * Returns 0 on success. */ NCURSES_EXPORT(int) _nc_db_next(DB * db, DBT * key, DBT * data) { int result; #if HASHED_DB_API >= 2 (void) db; if (cursor != 0) { result = cursor->c_get(cursor, key, data, DB_NEXT); } else { result = -1; } #else result = db->seq(db, key, data, 0); #endif return result; } /* * Check if a record is a terminfo index record. Index records are those that * contain only an alias pointing to a list of aliases. */ NCURSES_EXPORT(bool) _nc_db_have_index(DBT * key, DBT * data, char **buffer, int *size) { bool result = FALSE; int used = data->size - 1; char *have = (char *) data->data; (void) key; if (*have++ == 2) { result = TRUE; } /* * Update params in any case for consistency with _nc_db_have_data(). */ *buffer = have; *size = used; return result; } /* * Check if a record is the terminfo data record. Ignore index records, e.g., * those that contain only an alias pointing to a list of aliases. */ NCURSES_EXPORT(bool) _nc_db_have_data(DBT * key, DBT * data, char **buffer, int *size) { bool result = FALSE; int used = data->size - 1; char *have = (char *) data->data; if (*have++ == 0) { if (data->size > key->size && IS_TIC_MAGIC(have)) { result = TRUE; } } /* * Update params in any case to make it simple to follow a index record * to the data record. */ *buffer = have; *size = used; return result; } #else extern NCURSES_EXPORT(void) _nc_hashed_db(void); NCURSES_EXPORT(void) _nc_hashed_db(void) { } #endif /* USE_HASHED_DB */