commit 037b3ee44e7de00b4653d73d4808c0f679a909a7
author Tim Peters <tim.peters@gmail.com> Sat Aug 21 06:55:43 2004 +0000
committer Tim Peters <tim.peters@gmail.com> Sat Aug 21 06:55:43 2004 +0000
tree 88ecf25c35a355258bb869acab244cc1b48b4466
parent 7109b287cf84cebdfa99b2b0a657d55f6e481be7

Patch 1012740:  cStringIO's truncate doesn't

truncate() left the stream position unchanged, which meant the
"truncated" data didn't go away:

>>> io.write('abc')
>>> io.truncate(0)
>>> io.write('xyz')
>>> io.getvalue()
'abcxyz'

Patch by Dima Dorfman.

Modules/cStringIO.c

diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 7e75879..b7333fd 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -289,6 +289,7 @@
         if (pos < 0) pos = self->pos;
 
         if (self->string_size > pos) self->string_size = pos;
+        self->pos = self->string_size;
 
         Py_INCREF(Py_None);
         return Py_None;