Terminal: Set terminal size with TIOCSWINSZ when starting

This actually fixes the very broken vim port

kernel/include/kernel/Terminal/PseudoTerminal.h

@@ -30,6 +30,8 @@ namespace Kernel
 		bool can_write_impl() const override { SpinLockGuard _(m_buffer_lock); return m_buffer_size < m_buffer->size(); }
 		bool has_error_impl() const override { return false; }
 
+		BAN::ErrorOr<long> ioctl_impl(int, void*) override;
+
 	private:
 		PseudoTerminalMaster(BAN::UniqPtr<VirtualRange>, mode_t, uid_t, gid_t);
 		~PseudoTerminalMaster();
@@ -61,6 +63,8 @@ namespace Kernel
 	protected:
 		void putchar_impl(uint8_t ch) override;
 
+		BAN::ErrorOr<long> ioctl_impl(int, void*) override;
+
 	private:
 		PseudoTerminalSlave(BAN::String&& name, uint32_t number, mode_t, uid_t, gid_t);
 		~PseudoTerminalSlave();

kernel/kernel/Terminal/PseudoTerminal.cpp

@@ -4,6 +4,7 @@
 
 #include <BAN/ScopeGuard.h>
 
+#include <sys/ioctl.h>
 #include <sys/sysmacros.h>
 
 namespace Kernel
@@ -139,6 +140,14 @@ namespace Kernel
 		return buffer.size();
 	}
 
+	BAN::ErrorOr<long> PseudoTerminalMaster::ioctl_impl(int request, void* argument)
+	{
+		auto slave = m_slave.lock();
+		if (!slave)
+			return BAN::Error::from_errno(ENODEV);
+		return slave->ioctl(request, argument);
+	}
+
 	PseudoTerminalSlave::PseudoTerminalSlave(BAN::String&& name, uint32_t number, mode_t mode, uid_t uid, gid_t gid)
 		: TTY(mode, uid, gid)
 		, m_name(BAN::move(name))
@@ -163,4 +172,20 @@ namespace Kernel
 			master->putchar(ch);
 	}
 
+	BAN::ErrorOr<long> PseudoTerminalSlave::ioctl_impl(int request, void* argument)
+	{
+		switch (request)
+		{
+			case TIOCSWINSZ:
+			{
+				const auto* winsize = static_cast<struct winsize*>(argument);
+				m_width = winsize->ws_col;
+				m_height = winsize->ws_row;
+				return 0;
+			}
+		}
+
+		return TTY::ioctl_impl(request, argument);
+	}
+
 }

userspace/programs/Terminal/Terminal.cpp

@@ -6,6 +6,7 @@
 #include <ctype.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#include <sys/ioctl.h>
 #include <sys/select.h>
 #include <unistd.h>
 
@@ -119,6 +120,14 @@ void Terminal::run()
 
 	m_font = MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv));
 
+	{
+		winsize winsize;
+		winsize.ws_col = cols();
+		winsize.ws_row = rows();
+		if (ioctl(m_shell_info.pts_master, TIOCSWINSZ, &winsize) == -1)
+			perror("ioctl");
+	}
+
 	{
 		timespec ts;
 		clock_gettime(CLOCK_MONOTONIC, &ts);