LibC: Implement tc{get,set}winsize functions

We already support the operation with ioctl, these functions are simply
the POSIX-compatible way of doing it. They were added in POSIX 2024.

Userland/Libraries/LibC/termios.cpp

@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <sys/ioctl.h>
 #include <termios.h>
+#include <unistd.h>
 
 extern "C" {
 
@@ -154,4 +155,16 @@ void cfmakeraw(struct termios* tp)
     termios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
     termios.c_cflag |= CS8;
 }
+
+// https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcgetwinsize.html
+int tcgetwinsize(int fildes, winsize* winsize_p)
+{
+    return ioctl(fildes, TIOCGWINSZ, winsize_p);
+}
+
+// https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcsetwinsize.html
+int tcsetwinsize(int fildes, winsize const* winsize_p)
+{
+    return ioctl(fildes, TIOCSWINSZ, winsize_p);
+}
 }

Userland/Libraries/LibC/termios.h

@@ -18,6 +18,9 @@ int tcsendbreak(int fd, int duration);
 int tcflow(int fd, int action);
 int tcflush(int fd, int queue_selector);
 
+int tcgetwinsize(int fildes, struct winsize* winsize_p);
+int tcsetwinsize(int fildes, const struct winsize* winsize_p);
+
 speed_t cfgetispeed(const struct termios*);
 speed_t cfgetospeed(const struct termios*);
 int cfsetispeed(struct termios*, speed_t);