Fix terminfo in portable-lldb and fix terminal size (#3050)

* fix terminal size

* fix terminfo on portable lldb

nix/portable.nix

@@ -187,6 +187,7 @@ let
         chmod -R +w $out
 
         # copy extra files
+        mkdir -p $out/pwndbg/share/
         cp -rf ${lib.getLib pkgs.ncurses}/share/terminfo/ $out/pwndbg/share/
 
         # fix ipython autocomplete

pwndbg/ui.py

@@ -57,7 +57,7 @@ def addrsz(address) -> str:
 
 
 def get_window_size(target=sys.stdout):
-    fallback = (int(os.environ.get("LINES", 20)), int(os.environ.get("COLUMNS", 80)))
+    fallback = (int(os.environ.get("LINES", 24)), int(os.environ.get("COLUMNS", 80)))
     if not target.isatty():
         return fallback
     if os.environ.get("PWNDBG_IN_TEST") is not None:
@@ -71,7 +71,7 @@ def get_window_size(target=sys.stdout):
 
     try:
         term = os.get_terminal_size(target.fileno())
-        return term.lines, term.columns
+        return term.lines or fallback[0], term.columns or fallback[1]
     except Exception:
         pass