app_read: Add an option to return terminator on empty digits.

Adds 'e' option to allow Read() to return the terminator as the
dialed digits in the case where only the terminator is entered.

ie; if "#" is entered, return "#" if the 'e' option is set and ""
if it is not.

ASTERISK-30411

Change-Id: I49f3221824330a193a20c660f99da0f1fc2cbbc5

apps/app_read.c

@@ -85,6 +85,13 @@
 						and you will need to rely on duration and max digits
 						for ending input.</para>
 					</option>
+					<option name="e">
+						<para>to read the terminator as the digit string if the
+						only digit read is the terminator. This is for cases
+						where the terminator is a valid digit, but only by itself.
+						ie; <literal>1234</literal> and <literal>#</literal> are
+						valid, but <literal>1234#</literal> is not.</para>
+					</option>
 				</optionlist>
 			</parameter>
 			<parameter name="attempts">
@@ -125,6 +132,7 @@ enum read_option_flags {
 	OPT_INDICATION = (1 << 1),
 	OPT_NOANSWER = (1 << 2),
 	OPT_TERMINATOR = (1 << 3),
+	OPT_KEEP_TERMINATOR = (1 << 4),
 };
 
 enum {
@@ -138,6 +146,7 @@ AST_APP_OPTIONS(read_app_options, {
 	AST_APP_OPTION('i', OPT_INDICATION),
 	AST_APP_OPTION('n', OPT_NOANSWER),
 	AST_APP_OPTION_ARG('t', OPT_TERMINATOR, OPT_ARG_TERMINATOR),
+	AST_APP_OPTION('e', OPT_KEEP_TERMINATOR),
 });
 
 static char *app = "Read";
@@ -261,12 +270,20 @@ static int read_exec(struct ast_channel *chan, const char *data)
 				}
 			} else {
 				res = ast_app_getdata_terminator(chan, arglist.filename, tmp, maxdigits, to, terminator);
-				if (res == AST_GETDATA_COMPLETE || res == AST_GETDATA_EMPTY_END_TERMINATED)
+				if (res == AST_GETDATA_COMPLETE) {
+					status = "OK";
+				} else if (res == AST_GETDATA_EMPTY_END_TERMINATED) {
+					if (ast_test_flag(&flags, OPT_KEEP_TERMINATOR)) {
+						/* if the option is set to do so, read the
+						   returned string as the terminator string */
+						ast_copy_string(tmp, terminator, sizeof(tmp));
+					}
 					status = "OK";
-				else if (res == AST_GETDATA_TIMEOUT)
+				} else if (res == AST_GETDATA_TIMEOUT) {
 					status = "TIMEOUT";
-				else if (res == AST_GETDATA_INTERRUPTED)
+				} else if (res == AST_GETDATA_INTERRUPTED) {
 					status = "INTERRUPTED";
+				}
 			}
 			if (res > -1) {
 				pbx_builtin_setvar_helper(chan, arglist.variable, tmp);

doc/CHANGES-staging/app_read_return_terminator.txt

+Subject: app_read
+
+A new option 'e' has been added to allow Read() to return the
+terminator as the dialed digits in the case where only the terminator
+is entered.