made cursor movement and newlines work properly when they hit screen borders

lib/vtansi.lua

@@ -2,10 +2,10 @@ local vtansi = {}
 vtansi.sequences = {
  [28] = "\n", -- newline
  [200] = "\27[A", -- up
- [201] = "\27[5~", -- page up
  [203] = "\27[D", -- left
  [205] = "\27[C", -- right
  [208] = "\27[B", -- down
+ [201] = "\27[5~", -- page up
  [209] = "\27[6~" -- page down
 }
 function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gpu* and returns a function to write to it in a manner like an ANSI terminal
@@ -59,6 +59,7 @@ function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gp
     if cc == "\n" then
      flushwb()
      cx,cy = 1, cy+1
+     checkCursor()
     elseif cc == "\t" then
      wb=wb..(" "):rep(8*((cx+9)//8))
     elseif cc == "\27" then
@@ -85,13 +86,25 @@ function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gp
      if cc == "H" then
       cx, cy = math.min(mx,tA[1] or 1), math.min(my,tA[2] or 1)
      elseif cc == "A" then
-      cy = cy - (tA[1] or 1)
+      for i = 1, (tA[1] or 1) do
+       cy = cy - 1
+       checkCursor()
+      end
      elseif cc == "B" then
-      cy = cy + (tA[1] or 1)
+      for i = 1, (tA[1] or 1) do
+       cy = cy + 1
+       checkCursor()
+      end
      elseif cc == "C" then
-      cx = cx + (tA[1] or 1)
+      for i = 1, (tA[1] or 1) do
+       cx = cx + 1
+       checkCursor()
+      end
      elseif cc == "D" then
-      cx = cx - (tA[1] or 1)
+      for i = 1, (tA[1] or 1) do
+       cx = cx - 1
+       checkCursor()
+      end
      elseif cc == "s" then
       sx, sy = cx, cy
      elseif cc == "u" then