Fix DOS line endings parsing

Previously we would fail to lex lines ending with CRLF properly.

.gitattributes

@@ -0,0 +1 @@
+testdata/dos-lines eol=crlf

AUTHORS.txt

@@ -1,2 +1,3 @@
+Eugene Terentev <eugene@terentev.net>
 Kevin Burke <kev@inburke.com>
 Sergey Lukjanov <me@slukjanov.name>

config_test.go

@@ -338,3 +338,27 @@ func TestIndexInRange(t *testing.T) {
 		t.Errorf("expected User to be %q, got %q", "root", user)
 	}
 }
+
+func TestDosLinesEndingsDecode(t *testing.T) {
+	us := &UserSettings{
+		userConfigFinder: testConfigFinder("testdata/dos-lines"),
+	}
+
+	user, err := us.GetStrict("wap", "User")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if user != "root" {
+		t.Errorf("expected User to be %q, got %q", "root", user)
+	}
+
+	host, err := us.GetStrict("wap2", "HostName")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if host != "8.8.8.8" {
+		t.Errorf("expected HostName to be %q, got %q", "8.8.8.8", host)
+	}
+}

lexer.go

@@ -86,6 +86,12 @@ func (s *sshLexer) lexRvalue() sshLexStateFn {
 	for {
 		next := s.peek()
 		switch next {
+		case '\r':
+			if s.follow("\r\n") {
+				s.emitWithValue(tokenString, growingString)
+				s.skip()
+				return s.lexVoid
+			}
 		case '\n':
 			s.emitWithValue(tokenString, growingString)
 			s.skip()

testdata/dos-lines

@@ -0,0 +1,10 @@
+# Config file with dos line endings
+Host wap
+  HostName wap.example.org	
+  Port 22
+  User root
+  KexAlgorithms diffie-hellman-group1-sha1
+
+Host wap2
+  HostName 8.8.8.8
+  User google