[PATCH v3 6/8] t0021/rot13-filter: refactor checking final lf

[Christian Couder <christian.couder@gmail.com>]

As checking for a lf character at the end of a buffer
will be useful in another function, let's refactor this
functionality into a small remove_final_lf_or_die()
helper function.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 t/t0021/rot13-filter.pl | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/t/t0021/rot13-filter.pl b/t/t0021/rot13-filter.pl
index 9e18be66b6..8f255b6131 100644
--- a/t/t0021/rot13-filter.pl
+++ b/t/t0021/rot13-filter.pl
@@ -93,15 +93,23 @@ sub packet_bin_read {
 	}
 }
 
-sub packet_txt_read {
-	my ( $res, $buf ) = packet_bin_read();
-	if ( $res == -1 or $buf eq '' or $buf =~ s/\n$// ) {
-		return ( $res, $buf );
+sub remove_final_lf_or_die {
+	my $buf = shift;
+	if ( $buf =~ s/\n$// ) {
+		return $buf;
 	}
 	die "A non-binary line MUST be terminated by an LF.\n"
 	    . "Received: '$buf'";
 }
 
+sub packet_txt_read {
+	my ( $res, $buf ) = packet_bin_read();
+	if ( $res != -1 and $buf ne '' ) {
+		$buf = remove_final_lf_or_die($buf);
+	}
+	return ( $res, $buf );
+}
+
 # Read a text line and check that it is in the form "key=value"
 sub packet_key_val_read {
 	my ( $key ) = @_;
-- 
2.15.0.132.g7ad97d78be