Mailing List Archive

Update of /cvsroot/python/python/dist/src/Lib/test
In directory usw-pr-cvs1:/tmp/cvs-serv17165/python/Lib/test

Modified Files:
test_largefile.py
Log Message:
Change Windows file.truncate() to (a) restore the original file position,
and (b) stop trying to prevent file growth.

Beef up the file.truncate() docs.

Change test_largefile.py to stop assuming that f.truncate() moves the
file pointer to the truncation point, and to verify instead that it leaves
the file position alone. Remove the test for what happens when a
specified size exceeds the original file size (it's ill-defined, according
to the Single Unix Spec).


Index: test_largefile.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/test/test_largefile.py,v
retrieving revision 1.13
retrieving revision 1.14
diff -C2 -d -r1.13 -r1.14
*** test_largefile.py 11 Mar 2002 00:24:00 -0000 1.13
--- test_largefile.py 12 Mar 2002 03:04:44 -0000 1.14
***************
*** 134,155 ****
f = open(name, 'r+b')
f.seek(0, 2)
! expect(f.tell(), size+1)
# Cut it back via seek + truncate with no argument.
newsize = size - 10
f.seek(newsize)
f.truncate()
! expect(f.tell(), newsize)
! # Ensure that truncate(bigger than true size) doesn't grow the file.
! f.truncate(size)
! expect(f.tell(), newsize)
# Ensure that truncate(smaller than true size) shrinks the file.
newsize -= 1
! f.seek(0)
f.truncate(newsize)
! expect(f.tell(), newsize)
# cut it waaaaay back
- f.truncate(1)
f.seek(0)
! expect(len(f.read()), 1)
f.close()

--- 134,161 ----
f = open(name, 'r+b')
f.seek(0, 2)
! expect(f.tell(), size+1) # else we've lost track of the true size
# Cut it back via seek + truncate with no argument.
newsize = size - 10
f.seek(newsize)
f.truncate()
! expect(f.tell(), newsize) # else pointer moved
! f.seek(0, 2)
! expect(f.tell(), newsize) # else wasn't truncated
# Ensure that truncate(smaller than true size) shrinks the file.
newsize -= 1
! f.seek(42)
f.truncate(newsize)
! expect(f.tell(), 42) # else pointer moved
! f.seek(0, 2)
! expect(f.tell(), newsize) # else wasn't truncated
!
! # XXX truncate(larger than true size) is ill-defined across platforms
!
# cut it waaaaay back
f.seek(0)
! f.truncate(1)
! expect(f.tell(), 0) # else pointer moved
! expect(len(f.read()), 1) # else wasn't truncated
!
f.close()