Adjust libroot to invoke internal (__...) mbs-functions.

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

Second go at fixing what should have been part of r31927:
* uncommented fwscanf() in wchar.h to make it available
* imported wcsftime() from FreeBSD-8 (which just wraps strftime()), so that we
not only declare it, but provide an implementation, too
As a result, the next build of gcc4 should be able to detect full support for wchar_t and in turn activate wchar_t-based template types (like std::wstring).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37720 a95241bf-73f2-0310-859d-f6bbb57e9c96

Adjust libroot to invoke internal (__...) mbs-functions.

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

Second go at fixing what should have been part of r31927:
* uncommented fwscanf() in wchar.h to make it available
* imported wcsftime() from FreeBSD-8 (which just wraps strftime()), so that we
not only declare it, but provide an implementation, too
As a result, the next build of gcc4 should be able to detect full support for wchar_t and in turn activate wchar_t-based template types (like std::wstring).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37720 a95241bf-73f2-0310-859d-f6bbb57e9c96