[ Bug #116636 ] Bug in StringIO.write()

gvanrossum · gvanrossum · commit b636dc67ed3c · 2000-10-12T16:45:37.000Z
http://sourceforge.net/bugs/?func=detailbug&bug_id=116636&group_id=5470 bobalex@rsv.ricoh.com Bug report: If the file position is less than the end of the "file", and a write is performed extending past then end of the file, the data string is corrupted. Solution: in write(), when writing past the end, properly set self.len when newpos is > self.len.
diff --git a/Lib/StringIO.py b/Lib/StringIO.py
@@ -129,6 +129,8 @@ def write(self, s):
 				self.buflist = []
 			self.buflist = [self.buf[:self.pos], s, self.buf[newpos:]]
 			self.buf = ''
+			if newpos > self.len:
+				self.len = newpos
 		else:
 			self.buflist.append(s)
 			self.len = newpos
