[PATCH 3 of 5] Add util.splitpath() and use it instead of using split() directly

[Shun-ichi Goto]

# HG changeset patch
# User Shun-ichi GOTO <shunichi.goto at gmail.com>
# Date 1199621785 -32400
# Node ID e7739db328e05cf824c8d5f3bf6d694e15bb0d02
# Parent  43ff7c5ed8446a721a7bad5655ddd59f8fc62e7b
Add util.splitpath() and use it instead of using split() directly.

This is required for workaround of 0x5c issue.

diff -r 43ff7c5ed844 -r e7739db328e0 mercurial/util.py
--- a/mercurial/util.py	Sun Jan 06 21:16:08 2008 +0900
+++ b/mercurial/util.py	Sun Jan 06 21:16:25 2008 +0900
@@ -328,7 +328,7 @@ def pathto(root, n1, n2):
         if os.path.splitdrive(root)[0] != os.path.splitdrive(n1)[0]:
             return os.path.join(root, localpath(n2))
         n2 = '/'.join((pconvert(root), n2))
-    a, b = n1.split(os.sep), n2.split('/')
+    a, b = splitpath(n1), n2.split('/')
     a.reverse()
     b.reverse()
     while a and b and a[-1] == b[-1]:
@@ -886,6 +886,10 @@ def endswithsep(path):
     '''Check path ends with os.sep or os.altsep.'''
     return path.endswith(os.sep) or os.altsep and path.endswith(os.altsep)
 
+def splitpath(path):
+    '''Split path by os.sep with supporting mbcs local encoding.'''
+    return path.split(os.sep)
+
 # Platform specific variants
 if os.name == 'nt':
     import msvcrt
@@ -983,7 +987,7 @@ if os.name == 'nt':
         msvcrt.setmode(fd.fileno(), os.O_BINARY)
 
     def pconvert(path):
-        return path.replace("\\", "/")
+        return '/'.join(splitpath(path))
 
     def localpath(path):
         return path.replace('/', '\\')