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| -rw-r--r-- | include/apr_dbm.h | 227 |
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diff --git a/include/apr_dbm.h b/include/apr_dbm.h new file mode 100644 index 0000000..ad1b4f3 --- /dev/null +++ b/include/apr_dbm.h @@ -0,0 +1,227 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef APR_DBM_H +#define APR_DBM_H + +#include "apu.h" +#include "apr.h" +#include "apr_errno.h" +#include "apr_pools.h" +#include "apr_file_info.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @file apr_dbm.h + * @brief APR-UTIL DBM library + */ +/** + * @defgroup APR_Util_DBM DBM routines + * @ingroup APR_Util + * @{ + */ +/** + * Structure for referencing a dbm + */ +typedef struct apr_dbm_t apr_dbm_t; + +/** + * Structure for referencing the datum record within a dbm + */ +typedef struct +{ + /** pointer to the 'data' to retrieve/store in the DBM */ + char *dptr; + /** size of the 'data' to retrieve/store in the DBM */ + apr_size_t dsize; +} apr_datum_t; + +/* modes to open the DB */ +#define APR_DBM_READONLY 1 /**< open for read-only access */ +#define APR_DBM_READWRITE 2 /**< open for read-write access */ +#define APR_DBM_RWCREATE 3 /**< open for r/w, create if needed */ +#define APR_DBM_RWTRUNC 4 /**< open for r/w, truncating an existing + DB if present */ +/** + * Open a dbm file by file name and type of DBM + * @param dbm The newly opened database + * @param type The type of the DBM (not all may be available at run time) + * <pre> + * db for Berkeley DB files + * gdbm for GDBM files + * ndbm for NDBM files + * sdbm for SDBM files (always available) + * default for the default DBM type + * </pre> + * @param name The dbm file name to open + * @param mode The flag value + * <PRE> + * APR_DBM_READONLY open for read-only access + * APR_DBM_READWRITE open for read-write access + * APR_DBM_RWCREATE open for r/w, create if needed + * APR_DBM_RWTRUNC open for r/w, truncate if already there + * </PRE> + * @param perm Permissions to apply to if created + * @param cntxt The pool to use when creating the dbm + * @remark The dbm name may not be a true file name, as many dbm packages + * append suffixes for seperate data and index files. + * @bug In apr-util 0.9 and 1.x, the type arg was case insensitive. This + * was highly inefficient, and as of 2.x the dbm name must be provided in + * the correct case (lower case for all bundled providers) + */ + +APU_DECLARE(apr_status_t) apr_dbm_open_ex(apr_dbm_t **dbm, const char* type, + const char *name, + apr_int32_t mode, apr_fileperms_t perm, + apr_pool_t *cntxt); + + +/** + * Open a dbm file by file name + * @param dbm The newly opened database + * @param name The dbm file name to open + * @param mode The flag value + * <PRE> + * APR_DBM_READONLY open for read-only access + * APR_DBM_READWRITE open for read-write access + * APR_DBM_RWCREATE open for r/w, create if needed + * APR_DBM_RWTRUNC open for r/w, truncate if already there + * </PRE> + * @param perm Permissions to apply to if created + * @param cntxt The pool to use when creating the dbm + * @remark The dbm name may not be a true file name, as many dbm packages + * append suffixes for seperate data and index files. + */ +APU_DECLARE(apr_status_t) apr_dbm_open(apr_dbm_t **dbm, const char *name, + apr_int32_t mode, apr_fileperms_t perm, + apr_pool_t *cntxt); + +/** + * Close a dbm file previously opened by apr_dbm_open + * @param dbm The database to close + */ +APU_DECLARE(void) apr_dbm_close(apr_dbm_t *dbm); + +/** + * Fetch a dbm record value by key + * @param dbm The database + * @param key The key datum to find this record + * @param pvalue The value datum retrieved for this record + */ +APU_DECLARE(apr_status_t) apr_dbm_fetch(apr_dbm_t *dbm, apr_datum_t key, + apr_datum_t *pvalue); +/** + * Store a dbm record value by key + * @param dbm The database + * @param key The key datum to store this record by + * @param value The value datum to store in this record + */ +APU_DECLARE(apr_status_t) apr_dbm_store(apr_dbm_t *dbm, apr_datum_t key, + apr_datum_t value); + +/** + * Delete a dbm record value by key + * @param dbm The database + * @param key The key datum of the record to delete + * @remark It is not an error to delete a non-existent record. + */ +APU_DECLARE(apr_status_t) apr_dbm_delete(apr_dbm_t *dbm, apr_datum_t key); + +/** + * Search for a key within the dbm + * @param dbm The database + * @param key The datum describing a key to test + */ +APU_DECLARE(int) apr_dbm_exists(apr_dbm_t *dbm, apr_datum_t key); + +/** + * Retrieve the first record key from a dbm + * @param dbm The database + * @param pkey The key datum of the first record + */ +APU_DECLARE(apr_status_t) apr_dbm_firstkey(apr_dbm_t *dbm, apr_datum_t *pkey); + +/** + * Retrieve the next record key from a dbm + * @param dbm The database + * @param pkey The key datum of the next record + */ +APU_DECLARE(apr_status_t) apr_dbm_nextkey(apr_dbm_t *dbm, apr_datum_t *pkey); + +/** + * Proactively toss any memory associated with the apr_datum_t. + * @param dbm The database + * @param data The datum to free. + */ +APU_DECLARE(void) apr_dbm_freedatum(apr_dbm_t *dbm, apr_datum_t data); + +/** + * Report more information when an apr_dbm function fails. + * @param dbm The database + * @param errcode A DBM-specific value for the error (for logging). If this + * isn't needed, it may be NULL. + * @param errbuf Location to store the error text + * @param errbufsize The size of the provided buffer + * @return The errbuf parameter, for convenience. + */ +APU_DECLARE(char *) apr_dbm_geterror(apr_dbm_t *dbm, int *errcode, + char *errbuf, apr_size_t errbufsize); +/** + * If the specified file/path were passed to apr_dbm_open(), return the + * actual file/path names which would be (created and) used. At most, two + * files may be used; used2 may be NULL if only one file is used. + * @param pool The pool for allocating used1 and used2. + * @param type The type of DBM you require info on @see apr_dbm_open_ex + * @param pathname The path name to generate used-names from. + * @param used1 The first pathname used by the apr_dbm implementation. + * @param used2 The second pathname used by apr_dbm. If only one file is + * used by the specific implementation, this will be set to NULL. + * @return An error if the specified type is invalid. + * @remark The dbm file(s) don't need to exist. This function only manipulates + * the pathnames. + */ +APU_DECLARE(apr_status_t) apr_dbm_get_usednames_ex(apr_pool_t *pool, + const char *type, + const char *pathname, + const char **used1, + const char **used2); + +/** + * If the specified file/path were passed to apr_dbm_open(), return the + * actual file/path names which would be (created and) used. At most, two + * files may be used; used2 may be NULL if only one file is used. + * @param pool The pool for allocating used1 and used2. + * @param pathname The path name to generate used-names from. + * @param used1 The first pathname used by the apr_dbm implementation. + * @param used2 The second pathname used by apr_dbm. If only one file is + * used by the specific implementation, this will be set to NULL. + * @remark The dbm file(s) don't need to exist. This function only manipulates + * the pathnames. + */ +APU_DECLARE(void) apr_dbm_get_usednames(apr_pool_t *pool, + const char *pathname, + const char **used1, + const char **used2); + +/** @} */ +#ifdef __cplusplus +} +#endif + +#endif /* !APR_DBM_H */ |