[ python-Bugs-1156259 ] [2.4 regression] seeking in codecs.reader broken

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Bugs item #1156259, was opened at 2005-03-03 23:29
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Category: Extension Modules
Group: Python 2.4
Status: Open
Resolution: None
Priority: 7
Submitted By: Matthias Klose (doko)
Assigned to: Nobody/Anonymous (nobody)
Summary: [2.4 regression] seeking in codecs.reader broken

Initial Comment:
[forwarded from
https://bugzilla.ubuntu.com/show_bug.cgi?id=6972 ]

This is a regression; the following script (call as
"scriptname some_textfile")
fails.
It is obvious that the file starts with a number of
random bytes from the
previous run.

Uncommenting the two #XXX lines makes the bug go away.
So does running it with
Python 2.3.5

import sys
import codecs
from random import random

data = codecs.getreader("utf-8")(open(sys.argv[1]))
df = data.read()
for t in range(30):
    #XXX data.seek(0,1)
    #XXX data.read()
    data.seek(0,0)
    dn=""
    for l in data:
        dn += l
        if random() < 0.1: break
    if not df.startswith(dn):
        print "OUCH",t
        print "BAD:", dn[0:100]
        print "GOOD:", df[0:100]
        sys.exit(1)

print "OK",len(df)
sys.exit(0)

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