[pypy-svn] pypy default: Fix translation (hopefully), also fix semantics. Double win!

[alex_gaynor]

Author: Alex Gaynor <alex.gaynor at gmail.com>
Branch: 
Changeset: r41439:da6d343d720a
Date: 2011-01-29 01:31 -0500
http://bitbucket.org/pypy/pypy/changeset/da6d343d720a/

Log:	Fix translation (hopefully), also fix semantics. Double win!

diff --git a/pypy/module/_io/test/test_stringio.py b/pypy/module/_io/test/test_stringio.py
--- a/pypy/module/_io/test/test_stringio.py
+++ b/pypy/module/_io/test/test_stringio.py
@@ -49,6 +49,9 @@
         assert r == s[3:]
         raises(TypeError, sio.seek, 0.0)
 
+        exc_info = raises(ValueError, sio.seek, -3)
+        assert exc_info.value.args[0] == "negative seek position: -3"
+
     def test_write_error(self):
         import io
 
@@ -57,4 +60,4 @@
 
         sio = io.StringIO(u"")
         exc_info = raises(TypeError, sio.write, 3)
-        assert "int" in exc_info.value.args[0]
\ No newline at end of file
+        assert "int" in exc_info.value.args[0]

diff --git a/pypy/module/_io/interp_stringio.py b/pypy/module/_io/interp_stringio.py
--- a/pypy/module/_io/interp_stringio.py
+++ b/pypy/module/_io/interp_stringio.py
@@ -76,6 +76,10 @@
 
     @unwrap_spec('self', ObjSpace, int)
     def seek_w(self, space, pos):
+        if pos < 0:
+            raise operationerrfmt(space.w_ValueError,
+                "negative seek position: %d", pos
+            )
         self.pos = pos
 
     @unwrap_spec('self', ObjSpace)
@@ -116,4 +120,3 @@
     close = interp2app(W_StringIO.close_w),
     closed = GetSetProperty(W_StringIO.closed_get_w),
 )
-