Allocate screen memory on change of window size instead of one static…

… huge allocation.

display.c

@@ -28,7 +28,6 @@
 #include "termio.h"
 #include "terminal.h"
 #include "version.h"
-//#include "wrapper.h"
 #include "utf8.h"
 #include "window.h"
 
@@ -122,41 +121,49 @@ static void *xmalloc( size_t size) {
    compile time.  The original window has "WFCHG" set, so that it will get
    completely redrawn on the first call to "update".
  */
-void vtinit( void) {
-#ifdef SIGWINCH
-	signal( SIGWINCH, sizesignal) ;
-#endif
 
-	setlocale( LC_CTYPE, "") ; /* expects $LANG like en_GB.UTF-8 */
-	TTopen() ;		/* open the screen */
-	TTkopen() ;		/* open the keyboard */
-	TTrev( FALSE) ;
-	vscreen = xmalloc( term.t_maxrow * sizeof( video_p )) ;
+static int lastmrow ;		/* remember mrow for later free */
+
+static void vtalloc( int maxrow, int maxcol) {
+	lastmrow = maxrow ;		/* remember mrow for later free */
+	vscreen = xmalloc( maxrow * sizeof( video_p )) ;
 
 #if	MEMMAP == 0 || SCROLLCODE
-	pscreen = xmalloc( term.t_maxrow * sizeof( video_p )) ;
+	pscreen = xmalloc( maxrow * sizeof( video_p )) ;
 #endif
-	for( int i = 0 ; i < term.t_maxrow ; ++i) {
-		video_p vp = xmalloc( sizeof *vp + term.t_maxcol * sizeof( unicode_t)) ;
+	for( int i = 0 ; i < maxrow ; ++i) {
+		video_p vp = xmalloc( sizeof *vp + maxcol * sizeof( unicode_t)) ;
 		vp->v_flag = 0 ;
 #if	COLOR
 		vp->v_rfcolor = 7 ;
 		vp->v_rbcolor = 0 ;
 #endif
 		vscreen[ i] = vp ;
 #if	MEMMAP == 0 || SCROLLCODE
-		vp = xmalloc( sizeof *vp + term.t_maxcol * sizeof( unicode_t)) ;
+		vp = xmalloc( sizeof *vp + maxcol * sizeof( unicode_t)) ;
 		vp->v_flag = 0 ;
 		pscreen[ i] = vp ;
 #endif
 	}
 }
 
-#if	CLEAN
-/* free up all the dynamically allocated video structures */
+void vtinit( void) {
+#ifdef SIGWINCH
+	signal( SIGWINCH, sizesignal) ;
+#endif
+
+	setlocale( LC_CTYPE, "") ; /* expects $LANG like en_GB.UTF-8 */
+	TTopen() ;		/* open the screen */
+	TTkopen() ;		/* open the keyboard */
+	TTrev( FALSE) ;
+	vtalloc( term.t_mrow, term.t_mcol) ;
+}
+
+
+/* free up all the dynamically video structures allocated by vtalloc */
 void vtfree( void) {
 /* as xmalloc bypass the malloc macro, we need bypass the free macro too */
-	for( int i = 0 ; i < term.t_maxrow ; ++i ) {
+	for( int i = 0 ; i < lastmrow ; ++i ) {
 		(free)( vscreen[ i]) ;
 #if	MEMMAP == 0 || SCROLLCODE
 		(free)( pscreen[ i]) ;
@@ -168,7 +175,7 @@ void vtfree( void) {
 	(free)( pscreen) ;
 #endif
 }
-#endif
+
 
 
 /* Clean up the virtual terminal system, in anticipation for a return to
@@ -1455,6 +1462,8 @@ static int newscreensize( int h, int w) {
 	}
 
 	chg_width = chg_height = 0 ;
+	vtfree() ;
+	vtalloc( h, w) ;
 	if( h <= term.t_mrow)
 		newsize( TRUE, h) ;