VT in Windows : we can get the screen size via GetConsoleScreenBuffer…

…Info(). Thus far, this is only used at startup to detect the initial screen size, but at least in theory, we could use it to detect resizing.

vt/pdcscrn.c

@@ -33,6 +33,8 @@ int PDC_is_ansi = TRUE;
 int PDC_is_ansi = FALSE;
 #endif
 
+int PDC_rows = -1, PDC_cols = -1;
+
 #ifdef _WIN32
 
 #ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
@@ -57,6 +59,18 @@ support there.  On non-MS platforms,  PDC_is_ansi is always false...
 though that should be revisited for the Linux console,  and probably
 elsewhere.)  */
 
+static int PDC_get_screen_size( int *n_cols, int *n_rows)
+{
+    const HANDLE hOut = GetStdHandle( STD_OUTPUT_HANDLE);
+    CONSOLE_SCREEN_BUFFER_INFO ScreenBufferInfo;
+
+    assert( INVALID_HANDLE_VALUE != hOut);
+    GetConsoleScreenBufferInfo( hOut, &ScreenBufferInfo);
+    *n_cols = ScreenBufferInfo.srWindow.Right - ScreenBufferInfo.srWindow.Left + 1;
+    *n_rows = ScreenBufferInfo.srWindow.Bottom - ScreenBufferInfo.srWindow.Top + 1;
+    return( 0);
+}
+
 static int set_win10_for_vt_codes( const bool setting_mode)
 {
     const HANDLE hIn = GetStdHandle( STD_INPUT_HANDLE);
@@ -94,11 +108,12 @@ static int set_win10_for_vt_codes( const bool setting_mode)
               /* If we've gotten this far,  the terminal has been  */
               /* set up to process xterm-like sequences : */
     PDC_is_ansi = FALSE;
+    if( setting_mode)
+        PDC_get_screen_size( &PDC_cols, &PDC_rows);
     return( 0);
 }
 #endif
 
-int PDC_rows = -1, PDC_cols = -1;
 bool PDC_resize_occurred = FALSE;
 const int STDIN = 0;
 chtype PDC_capabilities = 0;
@@ -194,6 +209,7 @@ void PDC_scr_close( void)
    #endif
 #endif
    PDC_doupdate( );
+   PDC_flushinp( );
    PDC_puts_to_stdout( NULL);      /* free internal cache */
    return;
 }
@@ -308,9 +324,15 @@ int PDC_scr_open(void)
     {
         const char *env = getenv("PDC_LINES");
 
-        PDC_rows = (env ? atoi( env) : 25);
+        if( env)
+           PDC_rows = atoi( env);
+        if( PDC_rows < 2)
+           PDC_rows = 24;
         env = getenv( "PDC_COLS");
-        PDC_cols = (env ? atoi( env) : 80);
+        if( env)
+           PDC_cols = atoi( env);
+        if( PDC_cols < 2)
+           PDC_cols = 80;
     }
 #endif
     SP->mouse_wait = PDC_CLICK_PERIOD;