Mon May 14 04:42:55 2007

Asterisk developer's documentation


config.h

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  * \brief Configuration File Parser
00021  */
00022 
00023 #ifndef _ASTERISK_CONFIG_H
00024 #define _ASTERISK_CONFIG_H
00025 
00026 #if defined(__cplusplus) || defined(c_plusplus)
00027 extern "C" {
00028 #endif
00029 
00030 #include <stdarg.h>
00031 
00032 struct ast_config;
00033 
00034 struct ast_category;
00035 
00036 struct ast_variable {
00037    char *name;
00038    char *value;
00039    int lineno;
00040    int object;    /*!< 0 for variable, 1 for object */
00041    int blanklines;   /*!< Number of blanklines following entry */
00042    struct ast_comment *precomments;
00043    struct ast_comment *sameline;
00044    struct ast_variable *next;
00045    char stuff[0];
00046 };
00047 
00048 typedef struct ast_config *config_load_func(const char *database, const char *table, const char *configfile, struct ast_config *config, int withcomments);
00049 typedef struct ast_variable *realtime_var_get(const char *database, const char *table, va_list ap);
00050 typedef struct ast_config *realtime_multi_get(const char *database, const char *table, va_list ap);
00051 typedef int realtime_update(const char *database, const char *table, const char *keyfield, const char *entity, va_list ap);
00052 
00053 struct ast_config_engine {
00054    char *name;
00055    config_load_func *load_func;
00056    realtime_var_get *realtime_func;
00057    realtime_multi_get *realtime_multi_func;
00058    realtime_update *update_func;
00059    struct ast_config_engine *next;
00060 };
00061 
00062 /*! \brief Load a config file 
00063  * \param filename path of file to open.  If no preceding '/' character, path is considered relative to AST_CONFIG_DIR
00064  * Create a config structure from a given configuration file.
00065  *
00066  * Returns NULL on error, or an ast_config data structure on success
00067  */
00068 struct ast_config *ast_config_load(const char *filename);
00069 struct ast_config *ast_config_load_with_comments(const char *filename);
00070 
00071 /*! \brief Destroys a config 
00072  * \param config pointer to config data structure
00073  * Free memory associated with a given config
00074  *
00075  */
00076 void ast_config_destroy(struct ast_config *config);
00077 
00078 /*! \brief Goes through categories 
00079  * \param config Which config structure you wish to "browse"
00080  * \param prev A pointer to a previous category.
00081  * This funtion is kind of non-intuitive in it's use.  To begin, one passes NULL as the second arguement.  It will return a pointer to the string of the first category in the file.  From here on after, one must then pass the previous usage's return value as the second pointer, and it will return a pointer to the category name afterwards.
00082  *
00083  * Returns a category on success, or NULL on failure/no-more-categories
00084  */
00085 char *ast_category_browse(struct ast_config *config, const char *prev);
00086 
00087 /*! \brief Goes through variables
00088  * Somewhat similar in intent as the ast_category_browse.
00089  * List variables of config file category
00090  *
00091  * Returns ast_variable list on success, or NULL on failure
00092  */
00093 struct ast_variable *ast_variable_browse(const struct ast_config *config, const char *category);
00094 
00095 /*! \brief Gets a variable 
00096  * \param config which (opened) config to use
00097  * \param category category under which the variable lies
00098  * \param variable which variable you wish to get the data for
00099  * Goes through a given config file in the given category and searches for the given variable
00100  *
00101  * Returns the variable value on success, or NULL if unable to find it.
00102  */
00103 const char *ast_variable_retrieve(const struct ast_config *config, const char *category, const char *variable);
00104 
00105 /*! \brief Retrieve a category if it exists
00106  * \param config which config to use
00107  * \param category_name name of the category you're looking for
00108  * This will search through the categories within a given config file for a match.
00109  *
00110  * Returns pointer to category if found, NULL if not.
00111  */
00112 struct ast_category *ast_category_get(const struct ast_config *config, const char *category_name);
00113 
00114 /*! \brief Check for category duplicates 
00115  * \param config which config to use
00116  * \param category_name name of the category you're looking for
00117  * This will search through the categories within a given config file for a match.
00118  *
00119  * Return non-zero if found
00120  */
00121 int ast_category_exist(const struct ast_config *config, const char *category_name);
00122 
00123 /*! \brief Retrieve realtime configuration 
00124  * \param family which family/config to lookup
00125  * This will use builtin configuration backends to look up a particular 
00126  * entity in realtime and return a variable list of its parameters.  Note
00127  * that unlike the variables in ast_config, the resulting list of variables
00128  * MUST be freed with ast_variables_destroy() as there is no container.
00129  */
00130 struct ast_variable *ast_load_realtime(const char *family, ...);
00131 
00132 /*! \brief Retrieve realtime configuration 
00133  * \param family which family/config to lookup
00134  * This will use builtin configuration backends to look up a particular 
00135  * entity in realtime and return a variable list of its parameters. Unlike
00136  * the ast_load_realtime, this function can return more than one entry and
00137  * is thus stored inside a taditional ast_config structure rather than 
00138  * just returning a linked list of variables.
00139  */
00140 struct ast_config *ast_load_realtime_multientry(const char *family, ...);
00141 
00142 /*! \brief Update realtime configuration 
00143  * \param family which family/config to be updated
00144  * \param keyfield which field to use as the key
00145  * \param lookup which value to look for in the key field to match the entry.
00146  * This function is used to update a parameter in realtime configuration space.
00147  *
00148  */
00149 int ast_update_realtime(const char *family, const char *keyfield, const char *lookup, ...);
00150 
00151 /*! \brief Check if realtime engine is configured for family 
00152  * returns 1 if family is configured in realtime and engine exists
00153  * \param family which family/config to be checked
00154 */
00155 int ast_check_realtime(const char *family);
00156 
00157 /*! \brief Free variable list 
00158  * \param var the linked list of variables to free
00159  * This function frees a list of variables.
00160  */
00161 void ast_variables_destroy(struct ast_variable *var);
00162 
00163 /*! \brief Register config engine */
00164 int ast_config_engine_register(struct ast_config_engine *newconfig);
00165 
00166 /*! \brief Deegister config engine */
00167 int ast_config_engine_deregister(struct ast_config_engine *del);
00168 
00169 int register_config_cli(void);
00170 int read_config_maps(void);
00171 
00172 struct ast_config *ast_config_new(void);
00173 struct ast_category *ast_config_get_current_category(const struct ast_config *cfg);
00174 void ast_config_set_current_category(struct ast_config *cfg, const struct ast_category *cat);
00175 const char *ast_config_option(struct ast_config *cfg, const char *cat, const char *var);
00176 
00177 struct ast_category *ast_category_new(const char *name);
00178 void ast_category_append(struct ast_config *config, struct ast_category *cat);
00179 int ast_category_delete(struct ast_config *cfg, char *category);
00180 void ast_category_destroy(struct ast_category *cat);
00181 struct ast_variable *ast_category_detach_variables(struct ast_category *cat);
00182 void ast_category_rename(struct ast_category *cat, const char *name);
00183 
00184 struct ast_variable *ast_variable_new(const char *name, const char *value);
00185 void ast_variable_append(struct ast_category *category, struct ast_variable *variable);
00186 int ast_variable_delete(struct ast_category *category, char *variable, char *match);
00187 int ast_variable_update(struct ast_category *category, const char *variable, 
00188    const char *value, const char *match, unsigned int object);
00189 
00190 int config_text_file_save(const char *filename, const struct ast_config *cfg, const char *generator);
00191 
00192 struct ast_config *ast_config_internal_load(const char *configfile, struct ast_config *cfg, int withcomments);
00193 
00194 #if defined(__cplusplus) || defined(c_plusplus)
00195 }
00196 #endif
00197 
00198 #endif /* _ASTERISK_CONFIG_H */

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