Fix exception when 'print elements' is unlimited. (Fixes #145) (#146)

* Fix exception when 'print elements' is unlimited.

This now honors unlimited print elements by returning the full string in that case.

* Fix miscommit typo.

* Change approach of checking for unlimited, per @anthraxx.

pwndbg/strings.py

@@ -31,7 +31,10 @@ def update_length():
     message = gdb.execute('show print elements', from_tty=False, to_string=True)
     message = message.split()[-1]
     message = message.strip('.')
-    length  = int(message)
+    if message == 'unlimited':
+        length = 0
+    else:
+        length = int(message)
 
 def get(address, maxlen = None):
     if maxlen is None:
@@ -46,7 +49,7 @@ def get(address, maxlen = None):
     except Exception as e:
         return None
 
-    if len(sz) < maxlen:
+    if len(sz) < maxlen or not maxlen:
         return sz
 
     return sz[:maxlen] + '...'