[issue3322] bugs in scanstring_str() and scanstring_unicode() of _json module

[STINNER Victor]

STINNER Victor <haypo at users.sourceforge.net> added the comment:

I wrote that I'm unable to fix the bug correctly, but I wrote a patch 
to avoid the crash:
- replace begin by end in error messages: is it correct?
- use "end < 0 || len <= end" test to check scanstring() second 
argument => raise a ValueError if end value is invalid

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keywords: +patch
Added file: http://bugs.python.org/file10947/_json.patch

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