[issue7330] PyUnicode_FromFormat segfault

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

Here is the updated patch:

1, Work with function parse_format_flags() which is introduced in issue10829, and the patch is simpler and more clear than before.
2, Change parse_format_flags() to set precision value to -1 in the case of '%s' in order to differ with '%.0s'
3, Move call of unicode_format_align() in step 3 in order to avoid many codes like "n += width > PyUnicode_GET_SIZE(str) ? width : PyUnicode_GET_SIZE(str);", (following haypo's comments)

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Added file: http://bugs.python.org/file20983/issue7330_2.diff

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