[PATCH] Fix a num_put::_M_widen_int corner case

[Paolo Carlini]

Hi,

I discovered this bug while analyzing libstdc++/7989 (not a bug).
Currently, we seg fault on the testcases below, since, when
printing a grouped oct or hex zero even if showbase is true the
usual 0, 0x or 0X prefixes do not appear.

The patch was regression tested on x86-linux. In case, ok for
3.2.1 too, or not?

Ciao, Paolo.

/////////////

2002-09-27  Paolo Carlini  <pcarlini@unitus.it>

        * include/bits/locale_facets.tcc (num_put::_M_widen_int):
        Deal correctly with grouped, showbased (oct or hex) zero.
        * testsuite/22_locale/num_put_members_char.cc: Add test05.
        * testsuite/22_locale/num_put_members_wchar_t.cc: Ditto.

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