[Python-checkins] CVS: python/dist/src/Lib StringIO.py,1.10,1.11

[Fred L. Drake]

Update of /cvsroot/python/python/dist/src/Lib
In directory slayer.i.sourceforge.net:/tmp/cvs-serv22772/Lib

Modified Files:
	StringIO.py 
Log Message:

Add truncate() method to StringIO objects.

This closes SourceForge bug #115527.


Index: StringIO.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/StringIO.py,v
retrieving revision 1.10
retrieving revision 1.11
diff -C2 -r1.10 -r1.11
*** StringIO.py	2000/09/19 11:07:44	1.10
--- StringIO.py	2000/09/28 04:21:06	1.11
***************
*** 14,17 ****
--- 14,18 ----
  buf = f.readline()  # read until end of line ('\n') or EOF
  list = f.readlines()# list of f.readline() results until EOF
+ f.truncate([size])  # truncate file at to at most size (default: current pos)
  f.write(buf)        # write at current position
  f.writelines(list)  # for line in list: f.write(line)
***************
*** 29,32 ****
--- 30,34 ----
  """
  
+ import errno
  import string
  
***************
*** 103,106 ****
--- 105,119 ----
  			line = self.readline()
  		return lines
+ 	def truncate(self, size=None):
+ 		if self.closed:
+ 			raise ValueError, "I/O operation on closed file"
+ 		if size is None:
+ 			size = self.pos
+ 		elif size < 0:
+ 			raise IOError(errno.EINVAL,
+                                       "Negative size not allowed")
+ 		elif size < self.pos:
+ 			self.pos = size
+ 		self.buf = self.getvalue()[:size]
  	def write(self, s):
  		if self.closed: