support 'whence' arg to seek()

diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 8a54b46ea062de2129007b077f1d4e413fea508b..e60b73b966af6197993857b6b881a108ad7ae554 100755 (executable)
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -12,8 +12,13 @@ class _Mailbox:
                self.fp = fp
                self.seekp = 0
 
-       def seek(self, pos):
-               self.seekp = pos
+       def seek(self, pos, whence=0):
+               if whence==1:           # Relative to current position
+                       self.pos = self.pos + pos
+               if whence==2:           # Relative to file's end
+                       self.pos = self.stop + pos
+               else:                   # Default - absolute position
+                       self.pos = self.start + pos
 
        def next(self):
                while 1: