[Bug 4143] New: C version of pathencode generates broken strings for os functions

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4143

          Priority: normal
            Bug ID: 4143
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: C version of pathencode generates broken strings for
                    os functions
          Severity: bug
    Classification: Unclassified
                OS: All
          Reporter: yomgui1 at gmail.com
          Hardware: All
            Status: UNCONFIRMED
           Version: unspecified
         Component: Mercurial
           Product: Mercurial

pathencode in mercurial/pathencode.c may generate a string in such way
that PyString_GET_SIZE() != strlen().

This sort of string causes functions like ones in os module (chdir, ...), that
use "et" to parse arguments, to fail with error:

TypeError: must be encoded string without NULL bytes, not str

* Step to reproduce the issue:

python -c "import os; import mercurial.parsers as p; print
os.chdir(p.pathencode('test/'*30))"

=> the TypeError is raised

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