Various code and documentation cleanups for res_config_sqlite

(closes issue #10711, rbraun_proformatique)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@82321 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_config_sqlite.c

@@ -5,7 +5,7 @@
  *
  * Written by Richard Braun <rbraun@proformatique.com>
  *
- * Based on res_sqlite3 by Anthony Minessale II, 
+ * Based on res_sqlite3 by Anthony Minessale II,
  * and res_config_mysql by Matthew Boehm
  *
  * See http://www.asterisk.org for more information about
@@ -21,75 +21,60 @@
 
 /*!
  * \page res_config_sqlite
- * 
+ *
  * \section intro_sec Presentation
- * 
- * res_config_sqlite is a module for the Asterisk Open Source PBX to 
- * support SQLite 2 databases. It can be used to fetch configuration 
- * from a database (static configuration files and/or using the Asterisk 
+ *
+ * res_config_sqlite is a module for the Asterisk Open Source PBX to
+ * support SQLite 2 databases. It can be used to fetch configuration
+ * from a database (static configuration files and/or using the Asterisk
  * RealTime Architecture - ARA).
  * It can also be used to log CDR entries. Finally, it can be used for simple
  * queries in the Dialplan. Note that Asterisk already comes with a module
- * named cdr_sqlite. There are two reasons for including it in res_sqlite:
+ * named cdr_sqlite. There are two reasons for including it in res_config_sqlite:
  * the first is that rewriting it was a training to learn how to write a
  * simple module for Asterisk, the other is to have the same database open for
  * all kinds of operations, which improves reliability and performance.
- * 
+ *
  * There is already a module for SQLite 3 (named res_sqlite3) in the Asterisk
- * addons. res_sqlite was developed because we, at Proformatique, are using
+ * addons. res_config_sqlite was developed because we, at Proformatique, are using
  * PHP 4 in our embedded systems, and PHP 4 has no stable support for SQLite 3
  * at this time. We also needed RealTime support.
- * 
+ *
  * \section conf_sec Configuration
- * 
+ *
  * The main configuration file is res_config_sqlite.conf. It must be readable or
- * res_sqlite will fail to start. It is suggested to use the sample file
+ * res_config_sqlite will fail to start. It is suggested to use the sample file
  * in this package as a starting point. The file has only one section
  * named <code>general</code>. Here are the supported parameters :
- * 
+ *
  * <dl>
  *	<dt><code>dbfile</code></dt>
  *	<dd>The absolute path to the SQLite database (the file can be non existent,
- *			res_sqlite will create it if is has the appropriate rights)</dd>
+ *			res_config_sqlite will create it if it has the appropriate rights)</dd>
  *	<dt><code>config_table</code></dt>
  *	<dd>The table used for static configuration</dd>
  *	<dt><code>cdr_table</code></dt>
  *	<dd>The table used to store CDR entries (if ommitted, CDR support is
  *			disabled)</dd>
  * </dl>
- * 
- * To use res_sqlite for static and/or RealTime configuration, refer to the
+ *
+ * To use res_config_sqlite for static and/or RealTime configuration, refer to the
  * Asterisk documentation. The file tables.sql can be used to create the
  * needed tables.
- * 
- * The SQLITE() application is very similar to the MYSQL() application. You
- * can find more details at
- * <a href="http://voip-info.org/wiki/view/Asterisk+cmd+MYSQL">http://voip-info.org/wiki/view/Asterisk+cmd+MYSQL</a>.
- * The main difference is that you cannot choose your database - it's the
- * file set in the <code>dbfile</code> parameter. As a result, there is no
- * Connect or Disconnect command, and there is no connid variable.
- * 
+ *
  * \section status_sec Driver status
- * 
+ *
  * The CLI command <code>show sqlite status</code> returns status information
- * about the running driver. One information is more important than others:
- * the number of registered virtual machines. A SQLite virtual machine is
- * created each time a SQLITE() query command is used. If the number of
- * registered virtual machines isn't 0 (or near 0, since one or more SQLITE()
- * commands can be running when requesting the module status) and increases
- * over time, this probably means that you're badly using the application
- * and you're creating resource leaks. You should check your Dialplan and
- * reload res_sqlite (by unloading and then loading again - reloading isn't
- * supported)
- * 
+ * about the running driver.
+ *
  * \section credits_sec Credits
- * 
+ *
  * res_config_sqlite was developed by Richard Braun at the Proformatique company.
  */
 
 /*!
- * \file 
- * \brief res_sqlite module.
+ * \file
+ * \brief res_config_sqlite module.
  */
 
 /*** MODULEINFO
@@ -114,94 +99,85 @@
 #include "asterisk/options.h"
 #include "asterisk/linkedlists.h"
 
-#define RES_SQLITE_NAME "res_sqlite"
-#define RES_SQLITE_DRIVER "sqlite"
-#define RES_SQLITE_APP_DRIVER "SQLITE"
-#define RES_SQLITE_DESCRIPTION "Resource Module for SQLite 2"
-#define RES_SQLITE_CONF_FILE "res_config_sqlite.conf"
-#define RES_SQLITE_APP_SYNOPSIS "Dialplan access to SQLite 2"
-#define RES_SQLITE_APP_DESCRIPTION \
-"SQLITE(): " RES_SQLITE_APP_SYNOPSIS "\n"
-#define RES_SQLITE_STATUS_SUMMARY \
-"Show status information about the SQLite 2 driver"
-#define RES_SQLITE_STATUS_USAGE \
-"Usage: show sqlite status\n" \
-"	" RES_SQLITE_STATUS_SUMMARY "\n"
+#define MACRO_BEGIN	do {
+#define MACRO_END	} while (0)
+
+#define RES_CONFIG_SQLITE_NAME "res_config_sqlite"
+#define RES_CONFIG_SQLITE_DRIVER "sqlite"
+#define RES_CONFIG_SQLITE_DESCRIPTION "Resource Module for SQLite 2"
+#define RES_CONFIG_SQLITE_CONF_FILE "res_config_sqlite.conf"
+#define RES_CONFIG_SQLITE_STATUS_SUMMARY "Show status information about the SQLite 2 driver"
+#define RES_CONFIG_SQLITE_STATUS_USAGE			\
+	"Usage: show sqlite status\n"			\
+	"	" RES_CONFIG_SQLITE_STATUS_SUMMARY "\n"
 
 enum {
-	RES_SQLITE_CONFIG_ID,
-	RES_SQLITE_CONFIG_COMMENTED,
-	RES_SQLITE_CONFIG_FILENAME,
-	RES_SQLITE_CONFIG_CATEGORY,
-	RES_SQLITE_CONFIG_VAR_NAME,
-	RES_SQLITE_CONFIG_VAR_VAL,
-	RES_SQLITE_CONFIG_COLUMNS,
+	RES_CONFIG_SQLITE_CONFIG_ID,
+	RES_CONFIG_SQLITE_CONFIG_COMMENTED,
+	RES_CONFIG_SQLITE_CONFIG_FILENAME,
+	RES_CONFIG_SQLITE_CONFIG_CATEGORY,
+	RES_CONFIG_SQLITE_CONFIG_VAR_NAME,
+	RES_CONFIG_SQLITE_CONFIG_VAR_VAL,
+	RES_CONFIG_SQLITE_CONFIG_COLUMNS,
 };
 
-/*!
- * Limit the number of maximum simultaneous registered SQLite VMs to avoid
- * a denial of service attack.
- */
-#define RES_SQLITE_VM_MAX 1024
-
-#define SET_VAR(config, to, from) \
-do \
-	{ \
-		int __error; \
-		__error = set_var(&to, #to, from->value); \
-		if (__error) \
-			{ \
-				ast_config_destroy(config); \
-				unload_config(); \
-				return 1; \
-			} \
-	} \
-while (0)
+#define SET_VAR(config, to, from)			\
+MACRO_BEGIN						\
+	int __error;					\
+							\
+	__error = set_var(&to, #to, from->value);	\
+							\
+	if (__error) {					\
+		ast_config_destroy(config);		\
+		unload_config();			\
+		return 1;				\
+	}						\
+MACRO_END
 
 /*!
  * Maximum number of loops before giving up executing a query. Calls to
  * sqlite_xxx() functions which can return SQLITE_BUSY or SQLITE_LOCKED
- * are enclosed by RES_SQLITE_BEGIN and RES_SQLITE_END, e.g.
+ * are enclosed by RES_CONFIG_SQLITE_BEGIN and RES_CONFIG_SQLITE_END, e.g.
  * <pre>
  * char *errormsg;
  * int error;
- * 
- * RES_SQLITE_BEGIN
+ *
+ * RES_CONFIG_SQLITE_BEGIN
  *	 error = sqlite_exec(db, query, NULL, NULL, &errormsg);
- * RES_SQLITE_END(error)
- * 
+ * RES_CONFIG_SQLITE_END(error)
+ *
  * if (error)
  *	 ...;
  * </pre>
  */
-#define RES_SQLITE_MAX_LOOPS 10
+#define RES_CONFIG_SQLITE_MAX_LOOPS 10
 
 /*!
  * Macro used before executing a query.
- * 
- * \see RES_SQLITE_MAX_LOOPS.
+ *
+ * \see RES_CONFIG_SQLITE_MAX_LOOPS.
  */
-#define RES_SQLITE_BEGIN \
-{ \
-	int __i; \
-	for (__i = 0; __i < RES_SQLITE_MAX_LOOPS; __i++) \
-		{
+#define RES_CONFIG_SQLITE_BEGIN						\
+MACRO_BEGIN								\
+	int __i;							\
+									\
+	for (__i = 0; __i < RES_CONFIG_SQLITE_MAX_LOOPS; __i++)	{
 
 /*!
  * Macro used after executing a query.
- * 
- * \see RES_SQLITE_MAX_LOOPS.
+ *
+ * \see RES_CONFIG_SQLITE_MAX_LOOPS.
  */
-#define RES_SQLITE_END(error) \
-			if (error != SQLITE_BUSY && error != SQLITE_LOCKED) \
-				break; \
-			usleep(1000); \
-		} \
-}
+#define RES_CONFIG_SQLITE_END(error)					\
+		if (error != SQLITE_BUSY && error != SQLITE_LOCKED)	\
+			break;						\
+		usleep(1000);						\
+	}								\
+MACRO_END;
 
 /*!
  * Structure sent to the SQLite callback function for static configuration.
- * 
+ *
  * \see add_cfg_entry()
  */
 struct cfg_entry_args {
@@ -212,7 +188,7 @@ struct cfg_entry_args {
 
 /*!
  * Structure sent to the SQLite callback function for RealTime configuration.
- * 
+ *
  * \see add_rt_cfg_entry()
  */
 struct rt_cfg_entry_args {
@@ -223,7 +199,7 @@ struct rt_cfg_entry_args {
 /*!
  * Structure sent to the SQLite callback function for RealTime configuration
  * (realtime_multi_handler()).
- * 
+ *
  * \see add_rt_multi_cfg_entry()
  */
 struct rt_multi_cfg_entry_args {
@@ -244,10 +220,10 @@ static int set_var(char **var, char *name, char *value);
 /*!
  * \brief Load the configuration file.
  * \see unload_config()
- * 
+ *
  * This function sets dbfile, config_table, and cdr_table. It calls
  * check_vars() before returning, and unload_config() if an error occurred.
- * 
+ *
  * \retval 0 on success
  * \retval 1 if an error occurred
  */
@@ -262,10 +238,10 @@ static void unload_config(void);
 /*!
  * \brief Asterisk callback function for CDR support.
  * \param cdr the CDR entry Asterisk sends us.
- * 
+ *
  * Asterisk will call this function each time a CDR entry must be logged if
  * CDR support is enabled.
- * 
+ *
  * \retval 0 on success
  * \retval 1 if an error occurred
  */
@@ -273,11 +249,11 @@ static int cdr_handler(struct ast_cdr *cdr);
 
 /*!
  * \brief SQLite callback function for static configuration.
- * 
+ *
  * This function is passed to the SQLite engine as a callback function to
  * parse a row and store it in a struct ast_config object. It relies on
- * resulting rows	being sorted by category.
- * 
+ * resulting rows being sorted by category.
+ *
  * \param arg a pointer to a struct cfg_entry_args object
  * \param argc number of columns
  * \param argv values in the row
@@ -292,10 +268,10 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames);
 
 /*!
  * \brief Asterisk callback function for static configuration.
- * 
+ *
  * Asterisk will call this function when it loads its static configuration,
  * which usually happens at startup and reload.
- * 
+ *
  * \param database the database to use (ignored)
  * \param table the table to use
  * \param file the file to load from the database
@@ -307,24 +283,24 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames);
  * \see add_cfg_entry()
  */
 static struct ast_config * config_handler(const char *database, const char *table, const char *file,
-struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl);
+	struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl);
 
 /*!
  * \brief Helper function to parse a va_list object into 2 dynamic arrays of
  * strings, parameters and values.
- * 
+ *
  * ap must have the following format : param1 val1 param2 val2 param3 val3 ...
  * arguments will be extracted to create 2 arrays:
- * 
+ *
  * <ul>
  *	<li>params : param1 param2 param3 ...</li>
  *	<li>vals : val1 val2 val3 ...</li>
  * </ul>
- * 
+ *
  * The address of these arrays are stored in params_ptr and vals_ptr. It
  * is the responsibility of the caller to release the memory of these arrays.
  * It is considered an error that va_list has a null or odd number of strings.
- * 
+ *
  * \param ap the va_list object to parse
  * \param params_ptr where the address of the params array is stored
  * \param vals_ptr where the address of the vals array is stored
@@ -336,10 +312,10 @@ static size_t get_params(va_list ap, const char ***params_ptr,
 
 /*!
  * \brief SQLite callback function for RealTime configuration.
- * 
+ *
  * This function is passed to the SQLite engine as a callback function to
  * parse a row and store it in a linked list of struct ast_variable objects.
- * 
+ *
  * \param arg a pointer to a struct rt_cfg_entry_args object
  * \param argc number of columns
  * \param argv values in the row
@@ -354,16 +330,16 @@ static int add_rt_cfg_entry(void *arg, int argc, char **argv,
 
 /*!
  * Asterisk callback function for RealTime configuration.
- * 
+ *
  * Asterisk will call this function each time it requires a variable
  * through the RealTime architecture. ap is a list of parameters and
  * values used to find a specific row, e.g one parameter "name" and
  * one value "123" so that the SQL query becomes <code>SELECT * FROM
  * table WHERE name = '123';</code>.
- * 
+ *
  * \param database the database to use (ignored)
- * \param table		the table to use
- * \param ap			 list of parameters and values to match
+ * \param table the table to use
+ * \param ap list of parameters and values to match
  *
  * \retval a linked list of struct ast_variable objects
  * \retval NULL if an error occurred
@@ -374,11 +350,11 @@ static struct ast_variable * realtime_handler(const char *database,
 
 /*!
  * \brief SQLite callback function for RealTime configuration.
- * 
+ *
  * This function performs the same actions as add_rt_cfg_entry() except
  * that the rt_multi_cfg_entry_args structure is designed to store
- * categories in addition of variables.
- * 
+ * categories in addition to variables.
+ *
  * \param arg a pointer to a struct rt_multi_cfg_entry_args object
  * \param argc number of columns
  * \param argv values in the row
@@ -393,11 +369,11 @@ static int add_rt_multi_cfg_entry(void *arg, int argc, char **argv,
 
 /*!
  * \brief Asterisk callback function for RealTime configuration.
- * 
+ *
  * This function performs the same actions as realtime_handler() except
  * that it can store variables per category, and can return several
  * categories.
- * 
+ *
  * \param database the database to use (ignored)
  * \param table the table to use
  * \param ap list of parameters and values to match
@@ -407,19 +383,18 @@ static int add_rt_multi_cfg_entry(void *arg, int argc, char **argv,
  * \see add_rt_multi_cfg_entry()
  */
 static struct ast_config * realtime_multi_handler(const char *database,
-	const char *table,
-	va_list ap);
+	const char *table, va_list ap);
 
 /*!
  * \brief Asterisk callback function for RealTime configuration (variable
  * update).
- * 
+ *
  * Asterisk will call this function each time a variable has been modified
  * internally and must be updated in the backend engine. keyfield and entity
  * are used to find the row to update, e.g. <code>UPDATE table SET ... WHERE
  * keyfield = 'entity';</code>. ap is a list of parameters and values with the
  * same format as the other realtime functions.
- * 
+ *
  * \param database the database to use (ignored)
  * \param table the table to use
  * \param keyfield the column of the matching cell
@@ -429,18 +404,17 @@ static struct ast_config * realtime_multi_handler(const char *database,
  * \retval -1 if an error occurred.
  */
 static int realtime_update_handler(const char *database, const char *table,
-	const char *keyfield, const char *entity,
-	va_list ap);
+	const char *keyfield, const char *entity, va_list ap);
 
 /*!
  * \brief Asterisk callback function for RealTime configuration (variable
  * create/store).
- * 
+ *
  * Asterisk will call this function each time a variable has been created
- * internally and must be stored in the backend engine. 
- * are used to find the row to update, e.g. ap is a list of parameters and 
+ * internally and must be stored in the backend engine.
+ * are used to find the row to update, e.g. ap is a list of parameters and
  * values with the same format as the other realtime functions.
- * 
+ *
  * \param database the database to use (ignored)
  * \param table the table to use
  * \param ap list of parameters and new values to insert into the database
@@ -451,15 +425,15 @@ static int realtime_store_handler(const char *database, const char *table,
 	va_list ap);
 
 /*!
- * \brief Asterisk callback function for RealTime configuration (destroys 
+ * \brief Asterisk callback function for RealTime configuration (destroys
  * variable).
- * 
+ *
  * Asterisk will call this function each time a variable has been destroyed
  * internally and must be removed from the backend engine. keyfield and entity
  * are used to find the row to delete, e.g. <code>DELETE FROM table WHERE
  * keyfield = 'entity';</code>. ap is a list of parameters and values with the
  * same format as the other realtime functions.
- * 
+ *
  * \param database the database to use (ignored)
  * \param table the table to use
  * \param keyfield the column of the matching cell
@@ -469,12 +443,11 @@ static int realtime_store_handler(const char *database, const char *table,
  * \retval -1 if an error occurred.
  */
 static int realtime_destroy_handler(const char *database, const char *table,
-	const char *keyfield, const char *entity,
-	va_list ap);
+	const char *keyfield, const char *entity, va_list ap);
 
 /*!
  * \brief Asterisk callback function for the CLI status command.
- * 
+ *
  * \param fd file descriptor provided by Asterisk to use with ast_cli()
  * \param argc number of arguments
  * \param argv arguments list
@@ -503,16 +476,13 @@ static char *config_table;
 /*! The name of the table used to store CDR entries. */
 static char *cdr_table;
 
-/*! The number of registered virtual machines. */
-static int vm_count;
-
 /*!
  * The structure specifying all callback functions used by Asterisk for static
  * and RealTime configuration.
  */
 static struct ast_config_engine sqlite_engine =
 {
-	.name = RES_SQLITE_DRIVER,
+	.name = RES_CONFIG_SQLITE_DRIVER,
 	.load_func = config_handler,
 	.realtime_func = realtime_handler,
 	.realtime_multi_func = realtime_multi_handler,
@@ -523,7 +493,6 @@ static struct ast_config_engine sqlite_engine =
 
 /*!
  * The mutex used to prevent simultaneous access to the SQLite database.
- * SQLite isn't always compiled with thread safety.
  */
 AST_MUTEX_DEFINE_STATIC(mutex);
 
@@ -535,8 +504,8 @@ static struct ast_cli_entry cli_status_cmd =
 {
 	.cmda = {"show", "sqlite", "status", NULL},
 	.handler = cli_status,
-	.summary = RES_SQLITE_STATUS_SUMMARY,
-	.usage = RES_SQLITE_STATUS_USAGE
+	.summary = RES_CONFIG_SQLITE_STATUS_SUMMARY,
+	.usage = RES_CONFIG_SQLITE_STATUS_USAGE
 };
 
 /*
@@ -545,32 +514,33 @@ static struct ast_cli_entry cli_status_cmd =
 
 /*! SQL query format to create the CDR table if non existent. */
 static char *sql_create_cdr_table =
-"CREATE TABLE '%q' ("
-"	id		INTEGER PRIMARY KEY,"
-"	clid		VARCHAR(80) NOT NULL DEFAULT '',"
-"	src		VARCHAR(80) NOT NULL DEFAULT '',"
-"	dst		VARCHAR(80) NOT NULL DEFAULT '',"
-"	dcontext	VARCHAR(80) NOT NULL DEFAULT '',"
-"	channel		VARCHAR(80) NOT NULL DEFAULT '',"
-"	dstchannel	VARCHAR(80) NOT NULL DEFAULT '',"
-"	lastapp		VARCHAR(80) NOT NULL DEFAULT '',"
-"	lastdata	VARCHAR(80) NOT NULL DEFAULT '',"
-"	start		CHAR(19) NOT NULL DEFAULT '0000-00-00 00:00:00',"
-"	answer		CHAR(19) NOT NULL DEFAULT '0000-00-00 00:00:00',"
-"	end		CHAR(19) NOT NULL DEFAULT '0000-00-00 00:00:00',"
-"	duration	INT(11) NOT NULL DEFAULT '0',"
-"	billsec		INT(11) NOT NULL DEFAULT '0',"
-"	disposition	INT(11) NOT NULL DEFAULT '0',"
-"	amaflags	INT(11) NOT NULL DEFAULT '0',"
-"	accountcode	VARCHAR(20) NOT NULL DEFAULT '',"
-"	uniqueid	VARCHAR(32) NOT NULL DEFAULT '',"
-"	userfield	VARCHAR(255) NOT NULL DEFAULT ''"
+"CREATE TABLE '%q' (\n"
+"	id		INTEGER,\n"
+"	clid		VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	src		VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	dst		VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	dcontext	VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	channel		VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	dstchannel	VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	lastapp		VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	lastdata	VARCHAR(80)	NOT NULL	DEFAULT '',\n"
+"	start		DATETIME	NOT NULL	DEFAULT '0000-00-00 00:00:00',\n"
+"	answer		DATETIME	NOT NULL	DEFAULT '0000-00-00 00:00:00',\n"
+"	end		DATETIME	NOT NULL	DEFAULT '0000-00-00 00:00:00',\n"
+"	duration	INT(11)		NOT NULL	DEFAULT 0,\n"
+"	billsec		INT(11)		NOT NULL	DEFAULT 0,\n"
+"	disposition	VARCHAR(45)	NOT NULL	DEFAULT '',\n"
+"	amaflags	INT(11)		NOT NULL	DEFAULT 0,\n"
+"	accountcode	VARCHAR(20)	NOT NULL	DEFAULT '',\n"
+"	uniqueid	VARCHAR(32)	NOT NULL	DEFAULT '',\n"
+"	userfield	VARCHAR(255)	NOT NULL	DEFAULT '',\n"
+"	PRIMARY KEY	(id)\n"
 ");";
 
 /*! SQL query format to insert a CDR entry. */
 static char *sql_add_cdr_entry =
 "INSERT INTO '%q' ("
-"			 clid,"
+"	clid,"
 "	src,"
 "	dst,"
 "	dcontext,"
@@ -612,7 +582,7 @@ static char *sql_add_cdr_entry =
 /*!
  * SQL query format to fetch the static configuration of a file.
  * Rows must be sorted by category.
- * 
+ *
  * \see add_cfg_entry()
  */
 static char *sql_get_config_table =
@@ -655,10 +625,10 @@ static int load_config(void)
 	int error;
 	struct ast_flags config_flags = { 0 };
 
-	config = ast_config_load(RES_SQLITE_CONF_FILE, config_flags);
+	config = ast_config_load(RES_CONFIG_SQLITE_CONF_FILE, config_flags);
 
 	if (!config) {
-		ast_log(LOG_ERROR, "Unable to load " RES_SQLITE_CONF_FILE "\n");
+		ast_log(LOG_ERROR, "Unable to load " RES_CONFIG_SQLITE_CONF_FILE "\n");
 		return 1;
 	}
 
@@ -696,27 +666,37 @@ static void unload_config(void)
 
 static int cdr_handler(struct ast_cdr *cdr)
 {
-	char *errormsg;
+	char *query, *errormsg;
 	int error;
 
+	query = sqlite_mprintf(sql_add_cdr_entry, cdr_table, cdr->clid,
+			cdr->src, cdr->dst, cdr->dcontext, cdr->channel,
+			cdr->dstchannel, cdr->lastapp, cdr->lastdata,
+			cdr->start.tv_sec, cdr->answer.tv_sec,
+			cdr->end.tv_sec, cdr->duration, cdr->billsec,
+			cdr->disposition, cdr->amaflags, cdr->accountcode,
+			cdr->uniqueid, cdr->userfield);
+
+	if (!query) {
+		ast_log(LOG_WARNING, "Unable to allocate SQL query\n");
+		return 1;
+	}
+
+	ast_debug(1, "SQL query: %s\n", query);
+
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
-		error = sqlite_exec_printf(db, sql_add_cdr_entry, NULL, NULL, &errormsg,
-					 cdr_table, cdr->clid, cdr->src, cdr->dst,
-					 cdr->dcontext, cdr->channel, cdr->dstchannel,
-					 cdr->lastapp, cdr->lastdata, cdr->start.tv_sec,
-					 cdr->answer.tv_sec, cdr->end.tv_sec,
-					 cdr->duration, cdr->billsec, cdr->disposition,
-					 cdr->amaflags, cdr->accountcode, cdr->uniqueid,
-					 cdr->userfield);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_BEGIN
+		error = sqlite_exec(db, query, NULL, NULL, &errormsg);
+	RES_CONFIG_SQLITE_END(error)
 
 	ast_mutex_unlock(&mutex);
 
+	sqlite_freemem(query);
+
 	if (error) {
 		ast_log(LOG_ERROR, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 		return 1;
 	}
 
@@ -728,15 +708,15 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames)
 	struct cfg_entry_args *args;
 	struct ast_variable *var;
 
-	if (argc != RES_SQLITE_CONFIG_COLUMNS) {
+	if (argc != RES_CONFIG_SQLITE_CONFIG_COLUMNS) {
 		ast_log(LOG_WARNING, "Corrupt table\n");
 		return 1;
 	}
 
 	args = arg;
 
-	if (!args->cat_name || strcmp(args->cat_name, argv[RES_SQLITE_CONFIG_CATEGORY])) {
-		args->cat = ast_category_new(argv[RES_SQLITE_CONFIG_CATEGORY], "", 99999);
+	if (!args->cat_name || strcmp(args->cat_name, argv[RES_CONFIG_SQLITE_CONFIG_CATEGORY])) {
+		args->cat = ast_category_new(argv[RES_CONFIG_SQLITE_CONFIG_CATEGORY], "", 99999);
 
 		if (!args->cat) {
 			ast_log(LOG_WARNING, "Unable to allocate category\n");
@@ -744,7 +724,7 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames)
 		}
 
 		ast_free(args->cat_name);
-		args->cat_name = ast_strdup(argv[RES_SQLITE_CONFIG_CATEGORY]);
+		args->cat_name = ast_strdup(argv[RES_CONFIG_SQLITE_CONFIG_CATEGORY]);
 
 		if (!args->cat_name) {
 			ast_category_destroy(args->cat);
@@ -754,8 +734,7 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames)
 		ast_category_append(args->cfg, args->cat);
 	}
 
-	var = ast_variable_new(argv[RES_SQLITE_CONFIG_VAR_NAME],
-						   argv[RES_SQLITE_CONFIG_VAR_VAL], "");
+	var = ast_variable_new(argv[RES_CONFIG_SQLITE_CONFIG_VAR_NAME], argv[RES_CONFIG_SQLITE_CONFIG_VAR_VAL], "");
 
 	if (!var) {
 		ast_log(LOG_WARNING, "Unable to allocate variable");
@@ -763,15 +742,15 @@ static int add_cfg_entry(void *arg, int argc, char **argv, char **columnNames)
 	}
 
 	ast_variable_append(args->cat, var);
-	
+
 	return 0;
 }
 
 static struct ast_config *config_handler(const char *database,	const char *table, const char *file,
-struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl)
+	struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl)
 {
 	struct cfg_entry_args args;
-	char *errormsg;
+	char *query, *errormsg;
 	int error;
 
 	if (!config_table) {
@@ -782,24 +761,32 @@ struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl)
 	} else
 		table = config_table;
 
+	query = sqlite_mprintf(sql_get_config_table, table, file);
+
+	if (!query) {
+		ast_log(LOG_WARNING, "Unable to allocate SQL query\n");
+		return NULL;
+	}
+
+	ast_debug(1, "SQL query: %s\n", query);
 	args.cfg = cfg;
 	args.cat = NULL;
 	args.cat_name = NULL;
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
-		error = sqlite_exec_printf(db, sql_get_config_table, add_cfg_entry,
-					&args, &errormsg, table, file);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_BEGIN
+		error = sqlite_exec(db, query, add_cfg_entry, &args, &errormsg);
+	RES_CONFIG_SQLITE_END(error)
 
 	ast_mutex_unlock(&mutex);
 
 	ast_free(args.cat_name);
+	sqlite_freemem(query);
 
 	if (error) {
 		ast_log(LOG_ERROR, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 		return NULL;
 	}
 
@@ -873,8 +860,7 @@ static int add_rt_cfg_entry(void *arg, int argc, char **argv, char **columnNames
 	return 0;
 }
 
-static struct ast_variable *
-realtime_handler(const char *database, const char *table, va_list ap)
+static struct ast_variable * realtime_handler(const char *database, const char *table, va_list ap)
 {
 	char *query, *errormsg, *op, *tmp_str;
 	struct rt_cfg_entry_args args;
@@ -913,8 +899,7 @@ realtime_handler(const char *database, const char *table, va_list ap)
 
 		for (i = 1; i < params_count; i++) {
 			op = (strchr(params[i], ' ') == NULL) ? " =" : "";
-			tmp_str = sqlite_mprintf("%s AND %q%s '%q'", query, params[i], op,
-															 vals[i]);
+			tmp_str = sqlite_mprintf("%s AND %q%s '%q'", query, params[i], op, vals[i]);
 			sqlite_freemem(query);
 
 			if (!tmp_str) {
@@ -946,9 +931,9 @@ realtime_handler(const char *database, const char *table, va_list ap)
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
+	RES_CONFIG_SQLITE_BEGIN
 		error = sqlite_exec(db, query, add_rt_cfg_entry, &args, &errormsg);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_END(error)
 
 	ast_mutex_unlock(&mutex);
 
@@ -956,7 +941,7 @@ realtime_handler(const char *database, const char *table, va_list ap)
 
 	if (error) {
 		ast_log(LOG_WARNING, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 		ast_variables_destroy(args.var);
 		return NULL;
 	}
@@ -972,7 +957,7 @@ static int add_rt_multi_cfg_entry(void *arg, int argc, char **argv, char **colum
 	char *cat_name;
 	size_t i;
 
-	args = (struct rt_multi_cfg_entry_args *)arg;
+	args = arg;
 	cat_name = NULL;
 
 	/*
@@ -1012,7 +997,7 @@ static int add_rt_multi_cfg_entry(void *arg, int argc, char **argv, char **colum
 	return 0;
 }
 
-static struct ast_config *realtime_multi_handler(const char *database, 
+static struct ast_config *realtime_multi_handler(const char *database,
 	const char *table, va_list ap)
 {
 	char *query, *errormsg, *op, *tmp_str, *initfield;
@@ -1076,8 +1061,7 @@ static struct ast_config *realtime_multi_handler(const char *database,
 
 		for (i = 1; i < params_count; i++) {
 			op = (!strchr(params[i], ' ')) ? " =" : "";
-			tmp_str = sqlite_mprintf("%s AND %q%s '%q'", query, params[i], op,
-															 vals[i]);
+			tmp_str = sqlite_mprintf("%s AND %q%s '%q'", query, params[i], op, vals[i]);
 			sqlite_freemem(query);
 
 			if (!tmp_str) {
@@ -1111,9 +1095,9 @@ static struct ast_config *realtime_multi_handler(const char *database,
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
+	RES_CONFIG_SQLITE_BEGIN
 		error = sqlite_exec(db, query, add_rt_multi_cfg_entry, &args, &errormsg);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_END(error)
 
 	ast_mutex_unlock(&mutex);
 
@@ -1122,7 +1106,7 @@ static struct ast_config *realtime_multi_handler(const char *database,
 
 	if (error) {
 		ast_log(LOG_WARNING, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 		ast_config_destroy(cfg);
 		return NULL;
 	}
@@ -1131,8 +1115,7 @@ static struct ast_config *realtime_multi_handler(const char *database,
 }
 
 static int realtime_update_handler(const char *database, const char *table,
-	const char *keyfield, const char *entity,
-	va_list ap)
+	const char *keyfield, const char *entity, va_list ap)
 {
 	char *query, *errormsg, *tmp_str;
 	const char **params, **vals;
@@ -1163,8 +1146,7 @@ static int realtime_update_handler(const char *database, const char *table,
 		size_t i;
 
 		for (i = 1; i < params_count; i++) {
-			tmp_str = sqlite_mprintf("%s, %q = '%q'", query, params[i],
-															 vals[i]);
+			tmp_str = sqlite_mprintf("%s, %q = '%q'", query, params[i], vals[i]);
 			sqlite_freemem(query);
 
 			if (!tmp_str) {
@@ -1192,9 +1174,9 @@ static int realtime_update_handler(const char *database, const char *table,
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
+	RES_CONFIG_SQLITE_BEGIN
 		error = sqlite_exec(db, query, NULL, NULL, &errormsg);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_END(error)
 
 	if (!error)
 		rows_num = sqlite_changes(db);
@@ -1207,7 +1189,7 @@ static int realtime_update_handler(const char *database, const char *table,
 
 	if (error) {
 		ast_log(LOG_WARNING, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 	}
 
 	return rows_num;
@@ -1282,9 +1264,9 @@ static int realtime_store_handler(const char *database, const char *table, va_li
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
+	RES_CONFIG_SQLITE_BEGIN
 		error = sqlite_exec(db, tmp_str, NULL, NULL, &errormsg);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_END(error)
 
 	if (!error) {
 		rows_id = sqlite_last_insert_rowid(db);
@@ -1298,15 +1280,14 @@ static int realtime_store_handler(const char *database, const char *table, va_li
 
 	if (error) {
 		ast_log(LOG_WARNING, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 	}
 
 	return rows_id;
 }
 
 static int realtime_destroy_handler(const char *database, const char *table,
-	const char *keyfield, const char *entity,
-	va_list ap)
+	const char *keyfield, const char *entity, va_list ap)
 {
 	char *query, *errormsg, *tmp_str;
 	const char **params, **vals;
@@ -1356,14 +1337,13 @@ static int realtime_destroy_handler(const char *database, const char *table,
 	}
 	sqlite_freemem(query);
 	query = tmp_str;
-
 	ast_debug(1, "SQL query: %s\n", query);
 
 	ast_mutex_lock(&mutex);
 
-	RES_SQLITE_BEGIN
+	RES_CONFIG_SQLITE_BEGIN
 		error = sqlite_exec(db, query, NULL, NULL, &errormsg);
-	RES_SQLITE_END(error)
+	RES_CONFIG_SQLITE_END(error)
 
 	if (!error)
 		rows_num = sqlite_changes(db);
@@ -1376,7 +1356,7 @@ static int realtime_destroy_handler(const char *database, const char *table,
 
 	if (error) {
 		ast_log(LOG_WARNING, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 	}
 
 	return rows_num;
@@ -1409,7 +1389,7 @@ static int unload_module(void)
 		ast_cli_unregister(&cli_status_cmd);
 
 	if (cdr_registered)
-		ast_cdr_unregister(RES_SQLITE_NAME);
+		ast_cdr_unregister(RES_CONFIG_SQLITE_NAME);
 
 	ast_config_engine_deregister(&sqlite_engine);
 
@@ -1432,7 +1412,6 @@ static int load_module(void)
 	dbfile = NULL;
 	config_table = NULL;
 	cdr_table = NULL;
-	vm_count = 0;
 	error = load_config();
 
 	if (error)
@@ -1440,7 +1419,7 @@ static int load_module(void)
 
 	if (!(db = sqlite_open(dbfile, 0660, &errormsg))) {
 		ast_log(LOG_ERROR, "%s\n", errormsg);
-		ast_free(errormsg);
+		sqlite_freemem(errormsg);
 		unload_module();
 		return 1;
 	}
@@ -1448,10 +1427,28 @@ static int load_module(void)
 	ast_config_engine_register(&sqlite_engine);
 
 	if (use_cdr) {
-		RES_SQLITE_BEGIN
-			error = sqlite_exec_printf(db, "SELECT COUNT(id) FROM %Q;", NULL, NULL,
-																 &errormsg, cdr_table);
-		RES_SQLITE_END(error)
+		char *query;
+
+/* \cond DOXYGEN_CAN_PARSE_THIS */
+#undef QUERY
+#define QUERY "SELECT COUNT(id) FROM %Q;"
+/* \endcond */
+
+		query = sqlite_mprintf(QUERY, cdr_table);
+
+		if (!query) {
+			ast_log(LOG_ERROR, "Unable to allocate SQL query\n");
+			unload_module();
+			return 1;
+		}
+
+		ast_debug(1, "SQL query: %s\n", query);
+
+		RES_CONFIG_SQLITE_BEGIN
+			error = sqlite_exec(db, query, NULL, NULL, &errormsg);
+		RES_CONFIG_SQLITE_END(error)
+
+		sqlite_freemem(query);
 
 		if (error) {
 			/*
@@ -1459,26 +1456,37 @@ static int load_module(void)
 			 */
 			if (error != SQLITE_ERROR) {
 				ast_log(LOG_ERROR, "%s\n", errormsg);
-				ast_free(errormsg);
+				sqlite_freemem(errormsg);
 				unload_module();
 				return 1;
 			}
 
-			RES_SQLITE_BEGIN
-				error = sqlite_exec_printf(db, sql_create_cdr_table, NULL, NULL,
-								&errormsg, cdr_table);
-			RES_SQLITE_END(error)
+			sqlite_freemem(errormsg);
+			query = sqlite_mprintf(sql_create_cdr_table, cdr_table);
+
+			if (!query) {
+				ast_log(LOG_ERROR, "Unable to allocate SQL query\n");
+				unload_module();
+				return 1;
+			}
+
+			ast_debug(1, "SQL query: %s\n", query);
+
+			RES_CONFIG_SQLITE_BEGIN
+				error = sqlite_exec(db, query, NULL, NULL, &errormsg);
+			RES_CONFIG_SQLITE_END(error)
+
+			sqlite_freemem(query);
 
 			if (error) {
 				ast_log(LOG_ERROR, "%s\n", errormsg);
-				ast_free(errormsg);
+				sqlite_freemem(errormsg);
 				unload_module();
 				return 1;
 			}
 		}
 
-		error = ast_cdr_register(RES_SQLITE_NAME, RES_SQLITE_DESCRIPTION,
-														 cdr_handler);
+		error = ast_cdr_register(RES_CONFIG_SQLITE_NAME, RES_CONFIG_SQLITE_DESCRIPTION, cdr_handler);
 
 		if (error) {
 			unload_module();