file read : feature or bug ?
Asbuilt Easynet
ASBUILT at easynet.be
Tue Apr 15 12:10:17 EDT 2003
Hello,
I have a problem to use the read function that seems read more than
requested
as you can see in this sample demo.
Thanks
Jef
# This is a program to read a file in a reverse order by 3 characters block
# the demo.log file is 2 characters per line in windows so ended with CRLF
# 01
# 02
# 03
# 04
#
# we can see it like 01__02__03__04 where __ is CRLF
#
# PROBLEM :
# the program normaly should return
# _04
# 03_
# 2__
# __0
# 11
#
# BUT it returns
# _04
# 03_
# 2_0 <-- From where is coming the 0 ?
# _02 <-- From where is coming the 2 ?
# 11
# (this is an extract from rgrep.py)
import string
l_bufsize = 3
l_file = open("demo.log")
l_file.seek(0, 2)
l_pos = l_file.tell()
while l_pos > 0:
l_size = min(l_pos, l_bufsize)
l_pos = l_pos - l_size
l_file.seek(l_pos)
l_buffer = l_file.read(l_size)
print "l_buffer = " + l_buffer + "[" + str(len(l_buffer)) +"]"
l_lines = string.split(l_buffer, "x")
print "Split = " + str(l_lines)
del l_buffer
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