[jira] Commented: (STDCXX-535) std::num_put can generate output that is not parseable by std::num_get facet

["Martin Sebor (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STDCXX-535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12522331 ] 

Martin Sebor commented on STDCXX-535:
-------------------------------------

Here's a link to the same discussion in a more user-friendly archive:
http://www.mail-archive.com/stdcxx-dev@incubator.apache.org/msg04356.html

And a link to the Austin Group thread where I'm attempting to get an interpretation of the POSIX spec:
https://www.opengroup.org/sophocles/show_archive.tpl?source=L&listname=austin-group-l&first=1&pagesize=80&searchstring=strptime%28%29+and+leading+space&zone=G

> std::num_put can generate output that is not parseable by std::num_get facet
> ----------------------------------------------------------------------------
>
>                 Key: STDCXX-535
>                 URL: https://issues.apache.org/jira/browse/STDCXX-535
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4
>            Reporter: Travis Vitek
>
> std::num_get<>::get_date() is required to be able to parse the output produced by std::num_put<>::put(..., 'x'). For some locales, the '%x' format specifier expands out to '%e.%m.%Y'. When a date is formatted using this, there will be a leading space, and that leading space causes the num_get<>::get_date() operation to fail.
> The root of the problem is that the POSIX strftime() function requires that the '%e' specifier generate whitespace for single digit monthdays, and the POSIX strptime() function says that the number may be padded on the left with 0s. It does not appear to specify that whitespace is allowed. The strptime() implementation on some platforms [sun, linux, compaq, aix] allow this whitespace, while others [hp, freebsd] do not.
> Discussion here.
> [http://mail-archives.apache.org/mod_mbox/incubator-stdcxx-dev/200708.mbox/%3c46CC8D6C.9000007@roguewave.com%3e]

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