added pinvoke functions to query terminal size

impl/pal.h

@@ -54,6 +54,7 @@
     typedef char BOOL;
 	typedef unsigned short WCHAR_T;
 	typedef unsigned int UINT32;
+    typedef int INT32;
     typedef unsigned long HRESULT;
     typedef const wchar_t *PCWSTR;
     typedef wchar_t *PWSTR;

impl/terminal.cpp

@@ -0,0 +1,21 @@
+#include "terminal.h"
+#include <sys/ioctl.h>
+
+INT32 GetTerminalWidth()
+{
+    struct winsize ws;
+    if (-1 == ioctl(0,TIOCGWINSZ,&ws))
+        return -1;
+
+    return ws.ws_col;
+}
+
+INT32 GetTerminalHeight()
+{
+    struct winsize ws;
+    if (-1 == ioctl(0,TIOCGWINSZ,&ws))
+        return -1;
+
+    return ws.ws_row;
+}
+

impl/terminal.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "pal.h"
+
+PAL_BEGIN_EXTERNC
+
+INT32 GetTerminalWidth();
+INT32 GetTerminalHeight();
+
+PAL_END_EXTERNC
+