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apr_dbm.h
/* 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 */
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