Kernel: Fix termios and enter key handling

Enter key now produces expected \r which gets converted to \n by default
by the ICRNL input flag.

Also input flags are now handled always, not just when ICANON is set.
I don't know why I though ICANON should disable input handling

kernel/kernel/Terminal/PseudoTerminal.cpp

@@ -165,7 +165,7 @@ namespace Kernel
 
 	PseudoTerminalSlave::PseudoTerminalSlave(BAN::String&& name, uint32_t number, mode_t mode, uid_t uid, gid_t gid)
 		: TTY({
-			.c_iflag = 0,
+			.c_iflag = ICRNL,
 			.c_oflag = 0,
 			.c_cflag = CS8,
 			.c_lflag = ECHO | ECHOE | ECHOK | ICANON | ISIG,

kernel/kernel/Terminal/TTY.cpp

@@ -243,19 +243,14 @@ namespace Kernel
 
 		LockGuard _(m_mutex);
 
-		if (m_termios.c_lflag & ICANON)
-		{
-			if ((m_termios.c_iflag & ISTRIP))
-				ch &= 0x7F;
-			if ((m_termios.c_iflag & IGNCR) && ch == CR)
-				return;
-			uint8_t conv = ch;
-			if ((m_termios.c_iflag & ICRNL) && ch == CR)
-				conv = NL;
-			if ((m_termios.c_iflag & INLCR) && ch == NL)
-				conv = CR;
-			ch = conv;
-		}
+		if ((m_termios.c_iflag & ISTRIP))
+			ch &= 0x7F;
+		if ((m_termios.c_iflag & IGNCR) && ch == CR)
+			return;
+		if ((m_termios.c_iflag & ICRNL) && ch == CR)
+			ch = NL;
+		else if ((m_termios.c_iflag & INLCR) && ch == NL)
+			ch = CR;
 
 		if (m_termios.c_lflag & ISIG)
 		{
@@ -298,11 +293,10 @@ namespace Kernel
 				should_flush = true;
 			}
 
-			if (ch == NL || ch == m_termios.c_cc[VEOL])
+			if (ch == NL || ch == CR || ch == m_termios.c_cc[VEOL])
 			{
 				should_flush = true;
 				force_echo = !!(m_termios.c_lflag & ECHONL);
-				ch = NL;
 			}
 		}
 

kernel/kernel/Terminal/VirtualTTY.cpp

@@ -37,7 +37,7 @@ namespace Kernel
 
 	VirtualTTY::VirtualTTY(BAN::RefPtr<TerminalDriver> driver)
 		: TTY({
-			.c_iflag = 0,
+			.c_iflag = ICRNL,
 			.c_oflag = 0,
 			.c_cflag = CS8,
 			.c_lflag = ECHO | ECHOE | ECHOK  | ICANON | ISIG,