app_directory: add ability to specify configuration file

Adds option to app_directory to specify a filename from which to
read configuration instead of voicemail.conf ie;

same => n,Directory(,,c(directory.conf))

This configuration should contain a list of extensions using the
voicemail.conf format, ie;

2020=2020,Dog Dog,,,,attach=no|saycid=no|envelope=no|delete=no

ASTERISK-30404

Change-Id: Id58ccb1344ad1e563fa10db12f172fbd104a9d13

apps/app_directory.c

@@ -103,6 +103,10 @@
 						receiver to their ear while entering DTMF.</para>
 						<argument name="n" required="true" />
 					</option>
+					<option name="c">
+						<para>Load the specified config file instead of voicemail.conf</para>
+						<argument name="filename" required="true" />
+					</option>
 				</optionlist>
 				<note><para>Only one of the <replaceable>f</replaceable>, <replaceable>l</replaceable>, or <replaceable>b</replaceable>
 				options may be specified. <emphasis>If more than one is specified</emphasis>, then Directory will act as
@@ -114,7 +118,7 @@
 		<description>
 			<para>This application will present the calling channel with a directory of extensions from which they can search
 			by name. The list of names and corresponding extensions is retrieved from the
-			voicemail configuration file, <filename>voicemail.conf</filename>.</para>
+			voicemail configuration file, <filename>voicemail.conf</filename>, or from the specified filename.</para>
 			<para>This application will immediately exit if one of the following DTMF digits are
 			received and the extension to jump to exists:</para>
 			<para><literal>0</literal> - Jump to the 'o' extension, if it exists.</para>
@@ -153,6 +157,7 @@ enum {
 	OPT_PAUSE =           (1 << 5),
 	OPT_NOANSWER =        (1 << 6),
 	OPT_ALIAS =           (1 << 7),
+	OPT_CONFIG_FILE =     (1 << 8),
 };
 
 enum {
@@ -160,8 +165,9 @@ enum {
 	OPT_ARG_LASTNAME =    1,
 	OPT_ARG_EITHER =      2,
 	OPT_ARG_PAUSE =       3,
+	OPT_ARG_FILENAME =    4,
 	/* This *must* be the last value in this enum! */
-	OPT_ARG_ARRAY_SIZE =  4,
+	OPT_ARG_ARRAY_SIZE =  5,
 };
 
 struct directory_item {
@@ -183,6 +189,7 @@ AST_APP_OPTIONS(directory_app_options, {
 	AST_APP_OPTION('m', OPT_SELECTFROMMENU),
 	AST_APP_OPTION('n', OPT_NOANSWER),
 	AST_APP_OPTION('a', OPT_ALIAS),
+	AST_APP_OPTION_ARG('c', OPT_CONFIG_FILE, OPT_ARG_FILENAME),
 });
 
 static int compare(const char *text, const char *template)
@@ -458,7 +465,7 @@ static int select_item_menu(struct ast_channel *chan, struct directory_item **it
 
 AST_THREADSTORAGE(commonbuf);
 
-static struct ast_config *realtime_directory(char *context)
+static struct ast_config *realtime_directory(char *context, const char *filename)
 {
 	struct ast_config *cfg;
 	struct ast_config *rtdata = NULL;
@@ -475,14 +482,14 @@ static struct ast_config *realtime_directory(char *context)
 	}
 
 	/* Load flat file config. */
-	cfg = ast_config_load(VOICEMAIL_CONFIG, config_flags);
+	cfg = ast_config_load(filename, config_flags);
 
 	if (!cfg) {
 		/* Loading config failed. */
 		ast_log(LOG_WARNING, "Loading config failed.\n");
 		return NULL;
 	} else if (cfg == CONFIG_STATUS_FILEINVALID) {
-		ast_log(LOG_ERROR, "Config file %s is in an invalid format.  Aborting.\n", VOICEMAIL_CONFIG);
+		ast_log(LOG_ERROR, "Config file %s is in an invalid format.  Aborting.\n", filename);
 		return NULL;
 	}
 
@@ -867,7 +874,9 @@ static int directory_exec(struct ast_channel *chan, const char *data)
 	if (args.options && ast_app_parse_options(directory_app_options, &flags, opts, args.options))
 		return -1;
 
-	if (!(cfg = realtime_directory(args.vmcontext))) {
+	cfg = realtime_directory(args.vmcontext, S_OR(opts[OPT_ARG_FILENAME], VOICEMAIL_CONFIG));
+
+	if (!cfg) {
 		ast_log(LOG_ERROR, "Unable to read the configuration data!\n");
 		return -1;
 	}