From 5675dce5ea2960963a84ff771a30f0bedbca2853 Mon Sep 17 00:00:00 2001
From: Kenny Root <kenny@the-b.org>
Date: Thu, 30 Oct 2008 07:58:16 +0000
Subject: * Fix scrolling region setting bug. * Ignore xterm-style title
 updates (we could use this for the TerminalManager title, actually).

---
 src/de/mud/terminal/VDUBuffer.java | 33 +++++++++++++++++++++++++++++----
 src/de/mud/terminal/vt320.java     | 22 ++++++++++++++++++++--
 2 files changed, 49 insertions(+), 6 deletions(-)

(limited to 'src/de/mud')

diff --git a/src/de/mud/terminal/VDUBuffer.java b/src/de/mud/terminal/VDUBuffer.java
index a0d6b3b..90d5452 100644
--- a/src/de/mud/terminal/VDUBuffer.java
+++ b/src/de/mud/terminal/VDUBuffer.java
@@ -481,10 +481,13 @@ public class VDUBuffer {
 
     int bottom = (l > bottomMargin ? height - 1:
             (l < topMargin?topMargin:bottomMargin + 1));
-    System.arraycopy(charArray, screenBase + l + 1,
-                     charArray, screenBase + l, bottom - l - 1);
-    System.arraycopy(charAttributes, screenBase + l + 1,
-                     charAttributes, screenBase + l, bottom - l - 1);
+    int numRows = bottom - l - 1;
+    if (numRows > 0) {
+	    System.arraycopy(charArray, screenBase + l + 1,
+	                     charArray, screenBase + l, numRows);
+	    System.arraycopy(charAttributes, screenBase + l + 1,
+	                     charAttributes, screenBase + l, numRows);
+    }
     charArray[screenBase + bottom - 1] = new char[width];
     charAttributes[screenBase + bottom - 1] = new int[width];
     markLine(l, bottom - l);
@@ -612,6 +615,28 @@ public class VDUBuffer {
     return windowBase;
   }
 
+  /**
+   * Set the scroll margins simultaneously. If they're backwards, swap them.
+   * If they're out of bounds, trim them.
+   * @param l1 line that is the top
+   * @param l2 line that is the bottom
+   */
+  public void setMargins(int l1, int l2) {
+	  if (l1 > l2) {
+		  int temp = l2;
+		  l2 = l1;
+		  l1 = temp;
+	  }
+	  
+	  if (l1 < 0)
+		  l1 = 0;
+	  if (l2 > height - 1)
+		  l2 = height - 1;
+	  
+	  topMargin = l1;
+	  bottomMargin = l2;
+  }
+  
   /**
    * Set the top scroll margin for the screen. If the current bottom margin
    * is smaller it will become the top margin and the line will become the
diff --git a/src/de/mud/terminal/vt320.java b/src/de/mud/terminal/vt320.java
index d4aa05a..49af8f0 100644
--- a/src/de/mud/terminal/vt320.java
+++ b/src/de/mud/terminal/vt320.java
@@ -526,6 +526,7 @@ public abstract class vt320 extends VDUBuffer implements VDUInput {
   private final static int TSTATE_VT52Y = 15;
   private final static int TSTATE_CSI_TICKS = 16;
   private final static int TSTATE_CSI_EQUAL = 17; /* ESC [ = */
+  private final static int TSTATE_TITLE = 18; /* xterm title */
 
   /* Keys we support */
   public final static int KEY_PAUSE = 1;
@@ -1839,6 +1840,13 @@ public abstract class vt320 extends VDUBuffer implements VDUInput {
           case 'Y': /* vt52 cursor address mode , next chars are x,y */
             term_state = TSTATE_VT52Y;
             break;
+          case '_':
+          	term_state = TSTATE_TITLE;
+          	break;
+          case '\\':
+          	// TODO save title
+          	term_state = TSTATE_DATA;
+          	break;
           default:
             System.out.println("ESC unknown letter: " + c + " (" + ((int) c) + ")");
             break;
@@ -2409,14 +2417,14 @@ public abstract class vt320 extends VDUBuffer implements VDUInput {
               }
             } else
               R = rows - 1;
-            setBottomMargin(R);
+            int bot = R;
             System.out.println("setBottomMargin R="+R);
             if (R >= DCEvars[0]) {
               R = DCEvars[0] - 1;
               if (R < 0)
                 R = 0;
             }
-            setTopMargin(R);
+            setMargins(R, bot);
             System.out.println("setTopMargin R="+R);
             _SetCursor(0, 0);
             if (debug > 1)
@@ -2699,6 +2707,16 @@ public abstract class vt320 extends VDUBuffer implements VDUInput {
             break;
         }
         break;
+      case TSTATE_TITLE:
+      	switch (c) {
+      	  case ESC:
+      		term_state = TSTATE_ESC;
+      		break;
+      	  default:
+      		// TODO save title
+      		break;
+      	}
+      	break;
       default:
         term_state = TSTATE_DATA;
         break;
-- 
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