Fix terminal resizing when new postion of last modeline overlap top row of last window.

display.c

@@ -63,7 +63,6 @@ static int curcol ;		/* Cursor column                */
 static int vtrow = 0 ;	/* Row location of SW cursor */
 static int vtcol = 0 ;	/* Column location of SW cursor */
 static int lbound = 0 ;	/* leftmost column of current line being displayed */
-static int taboff = 0 ;	/* tab offset for display       */
 
 int mpresf = FALSE ;	/* TRUE if message in last line */
 int scrollcount = 1 ;	/* number of lines to scroll */
@@ -136,6 +135,14 @@ static void vtalloc( int maxrow, int maxcol) {
 	}
 }
 
+void updmargin( void) {
+	term.t_margin = term.t_ncol / 10 ;
+	if( term.t_margin < 3) /* t_margin - 1 enough for $ + prev before current */
+		term.t_margin = 3 ;
+
+	term.t_scrsiz = term.t_ncol - 2 * term.t_margin ;
+}
+
 void vtinit( void) {
 #ifdef SIGWINCH
 	signal( SIGWINCH, sizesignal) ;
@@ -143,6 +150,7 @@ void vtinit( void) {
 
 	setlocale( LC_CTYPE, "") ; /* expects $LANG like en_GB.UTF-8 */
 	TTopen() ;		/* open the screen */
+	updmargin() ;
 	TTkopen() ;		/* open the keyboard */
 	TTrev( FALSE) ;
 	vtalloc( term.t_mrow, term.t_mcol) ;
@@ -218,7 +226,7 @@ static void vtputuc( unicode_t c) {
 
 	if( c == '\t') {
 		sane_vtputc( viewtab ? 0xBB : ' ') ;	/* 0xBB: '»' */
-		while( ((vtcol + taboff) % tabwidth) != 0)
+		while( ((vtcol + lbound) % tabwidth) != 0)
 			sane_vtputc( ' ') ;
 	} else if( c < 0x20 || c == 0x7F) {
 		sane_vtputc( '^') ;
@@ -460,6 +468,8 @@ static void show_line( line_p lp) {
 		i += utf8_to_unicode( lp->l_text, i, len, &c) ;
 		vtputuc( c) ;
 	}
+
+	vteeol() ;
 }
 
 
@@ -469,9 +479,10 @@ static void show_line( line_p lp) {
  * window_p wp;		window to update current line in
  */
 static void updone( window_p wp) {
+	line_p lp ;
+
 /* search down the line we want */
 	int sline = wp->w_toprow ;	/* physical screen line to update */
-	line_p lp ;
 	for( lp = wp->w_linep ; lp != wp->w_dotp ; lp = lforw( lp))
 		++sline ;
 
@@ -484,7 +495,6 @@ static void updone( window_p wp) {
 	vscreen[ sline]->v_rfcolor = wp->w_fcolor ;
 	vscreen[ sline]->v_rbcolor = wp->w_bcolor ;
 #endif
-	vteeol() ;
 }
 
 
@@ -506,14 +516,14 @@ static void updall( window_p wp) {
 		/* if we are not at the end */
 			show_line( lp) ;
 			lp = lforw( lp) ;
-		}
+		} else
+			vteeol() ;
 
 	/* on to the next one */
 #if	COLOR
 		vscreen[ sline]->v_rfcolor = wp->w_fcolor ;
 		vscreen[ sline]->v_rbcolor = wp->w_bcolor ;
 #endif
-		vteeol() ;
 		++sline ;
 	}
 }
@@ -524,13 +534,12 @@ static void updall( window_p wp) {
     This is the only update for simple moves.
  */
 static void updpos( void) {
+	line_p lp ;
+
 /* find the current row */
-	line_p lp = curwp->w_linep ;
 	currow = curwp->w_toprow ;
-	while( lp != curwp->w_dotp) {
+	for( lp = curwp->w_linep ; lp != curwp->w_dotp ; lp = lforw( lp))
 		++currow ;
-		lp = lforw( lp) ;
-	}
 
 /* find the current column */
 	curcol = 0 ;
@@ -571,7 +580,6 @@ static void upddex( void) {
 				||  (curcol < term.t_ncol - 1)) {
 					vtmove( i, 0) ;
 					show_line( lp) ;
-					vteeol() ;
 
 				/* this line no longer is extended */
 					vscreen[ i]->v_flag &= ~VFEXT ;
@@ -798,30 +806,20 @@ static int endofline( unicode_t *s, int n) {
 
 
 /* updext:
- *	update the extended line which the cursor is currently
+   update the extended line which the cursor is currently on at a column
- *	on at a column greater than the terminal width. The line
+   greater than the terminal width.  The line will be scrolled right or
- *	will be scrolled right or left to let the user see where
+   left to let the user see where the cursor is.
- *	the cursor is
  */
 static void updext( void) {
-	int rcursor ;	/* real cursor location */
-	line_p lp ;	/* pointer to current line */
-
 	/* calculate what column the real cursor will end up in */
-	rcursor = ((curcol - term.t_ncol) % term.t_scrsiz) + term.t_margin ;
+	lbound = curcol - ((curcol - term.t_ncol) % term.t_scrsiz + term.t_margin) ;
-	taboff = lbound = curcol - rcursor + 1 ;
 
 	/* scan through the line outputing characters to the virtual screen */
 	/* once we reach the left edge                                  */
 	vtmove( currow, -lbound) ;	/* start scanning offscreen */
-	lp = curwp->w_dotp ;	/* line to output */
+	show_line( curwp->w_dotp) ;
-	show_line( lp) ;
 
-	/* truncate the virtual line, restore tab offset */
+	/* put a '$' in column 1 */
-	vteeol() ;
-	taboff = 0 ;
-
-	/* and put a '$' in column 1 */
 	vscreen[ currow]->v_text[ 0] = '$' ;
 }
 
@@ -1329,6 +1327,12 @@ static void sizesignal( int signr) {
 static void newscreensize( int h, int w) {
 	chg_width = chg_height = 0 ;
 	vtfree() ;
+	if( h < 3)
+		h = 3 ;
+
+	if( w < 10)
+		w = 10 ;
+
 	vtalloc( h, w) ;
 	if( h <= term.t_mrow)
 		newsize( TRUE, h) ;

display.h

@@ -25,6 +25,7 @@ void vtinit( void) ;
 void vtfree( void) ;
 void vttidy( void) ;
 void update( boolean force_f) ;
+void updmargin( void) ;
 void upmode( void) ;
 void movecursor( int row, int col) ;
 void mlerase( void) ;

names.c

@@ -50,8 +50,8 @@ const name_bind names[] = {
 	{"!case-word-lower", lowerword,					META | 'L'} ,
 	{"!case-word-upper", upperword,					META | 'U'} ,
 	{" change-file-name", filename,					CTLX | 'N'} ,
-	{" change-screen-size", newsize,				META | CTL_ | 'D'} , /* M^S */
+	{" change-screen-size", (fnp_t) newsize,		META | CTL_ | 'D'} , /* M^S */
-	{" change-screen-width", newwidth,				META | CTL_ | 'T'} ,
+	{" change-screen-width", (fnp_t) newwidth,		META | CTL_ | 'T'} ,
 	{" clear-and-redraw", (fnp_t) redraw,			CTL_ | 'L'} ,
 	{" clear-message-line", (fnp_t) clrmes, 		0} ,
 	{" copy-region", copyregion,					META | 'W'} ,

window.c

@@ -566,11 +566,8 @@ BINDABLE( restwnd) {
  * int f;	default flag
  * int n;	numeric argument
  */
-BINDABLE( newsize) {
+BBINDABLE( newsize) {
 	window_p wp ;		/* current window being examined */
-	window_p nextwp;	/* next window to scan */
-	window_p lastwp;	/* last window scanned */
-	int lastline;		/* screen line of last line of current window */
 
 	/* if the command defaults, assume the largest */
 	if( f == FALSE)
@@ -581,32 +578,33 @@ BINDABLE( newsize) {
 		return mloutfail( "%%Screen size out of range") ;
 
 	if( term.t_nrow == n - 1)
+	/* no change */
 		return TRUE ;
 	else if( term.t_nrow < n - 1) {
-
+	/* new size is bigger */
 		/* go to the last window */
-		wp = wheadp;
+		for( wp = wheadp ; wp->w_wndp != NULL ; wp = wp->w_wndp)
-		while (wp->w_wndp != NULL)
+			;
-			wp = wp->w_wndp;
 
 		/* and enlarge it as needed */
 		wp->w_ntrows = n - wp->w_toprow - 2 ;
 		wp->w_flag |= WFHARD | WFMODE ;
-
 	} else {
-
+	/* new size is smaller */
 		/* rebuild the window structure */
 		assert( wheadp->w_toprow == 0) ;	/* proves coverity wrong */
-		nextwp = wheadp;
+		window_p lastwp = NULL ;
-		wp = NULL;
+		for( window_p nextwp = wheadp ; nextwp != NULL ; ) {
-		lastwp = NULL;
-		while (nextwp != NULL) {
 			wp = nextwp ;
 			nextwp = wp->w_wndp ;
 
-			/* get rid of it if it is too low */
+			if( wp->w_toprow == n - 2) {
-			if (wp->w_toprow > n - 2) {
+				lastwp->w_ntrows = n - lastwp->w_toprow - 2 ;
+				lastwp->w_flag |= WFHARD | WFMODE ;
+			}
 
+			/* get rid of it if it is too low */
+			if( wp->w_toprow >= n - 2) {
 				/* save the point/mark if needed */
 				if( --wp->w_bufp->b_nwnd == 0) {
 					wp->w_bufp->b_dotp = wp->w_dotp ;
@@ -616,29 +614,27 @@ BINDABLE( newsize) {
 				}
 
 				/* update curwp and lastwp if needed */
-				if (wp == curwp)
+				if( wp == curwp) {
 					curwp = wheadp ;
 					curbp = curwp->w_bufp ;
-				if (lastwp != NULL)
+				}
-					lastwp->w_wndp = NULL;
 
 				/* free the structure */
-				free((char *) wp);
+				free( wp) ;
-				wp = NULL;
+				lastwp->w_wndp = NULL ;
-
 			} else {
 			/* need to change this window size? */
-				lastline = wp->w_toprow + wp->w_ntrows - 1;
+				int lastline = wp->w_toprow + wp->w_ntrows - 1 ;
 				if( lastline >= n - 2) {
-					wp->w_ntrows =
+					wp->w_ntrows = n - wp->w_toprow - 2 ;
-					    n - wp->w_toprow - 2;
+					assert( wp->w_ntrows) ;
 					wp->w_flag |= WFHARD | WFMODE ;
 				}
-			}
 
 				lastwp = wp ;
 			}
 		}
+	}
 
 	/* screen is garbage */
 	term.t_nrow = n - 1 ;
@@ -652,9 +648,7 @@ BINDABLE( newsize) {
  * int f;		default flag
  * int n;		numeric argument
  */
-BINDABLE( newwidth) {
+BBINDABLE( newwidth) {
-	window_p wp;
-
 	/* if the command defaults, assume the largest */
 	if( f == FALSE)
 		n = term.t_mcol ;
@@ -665,17 +659,13 @@ BINDABLE( newwidth) {
 
 	/* otherwise, just re-width it (no big deal) */
 	term.t_ncol = n ;
-	term.t_margin = n / 10;
+	updmargin() ;
-	term.t_scrsiz = n - (term.t_margin * 2);
 
-	/* florce all windows to redraw */
+	/* force all windows to redraw */
-	wp = wheadp;
+	for( window_p wp = wheadp ; wp; wp = wp->w_wndp)
-	while (wp) {
 		wp->w_flag |= WFHARD | WFMOVE | WFMODE ;
-		wp = wp->w_wndp;
-	}
-	sgarbf = TRUE;
 
+	sgarbf = TRUE ;
 	return TRUE ;
 }
 

window.h

@@ -55,8 +55,8 @@ extern window_p wheadp ;    /* Head of list of windows      */
  BINDABLE( enlargewind) ;
  BINDABLE( mvdnwind) ;
  BINDABLE( mvupwind) ;
- BINDABLE( newsize) ;
+BBINDABLE( newsize) ;
- BINDABLE( newwidth) ;
+BBINDABLE( newwidth) ;
  BINDABLE( nextwind) ;
  BINDABLE( onlywind) ;
  BINDABLE( prevwind) ;