Defined in locale.h, _get_lconv() performs the same function as the standard C library function, localeconv(), except that it delivers the result in user-provided memory instead of an internal static variable.
_get_lconv() sets the components of an lconv structure with values appropriate for the formatting of numeric quantities.
void _get_lconv(struct lconv *lc);
This extension to the ISO C library does not use any static data. If you are building an application that must conform strictly to the ISO C standard, use localeconv() instead.
The existing lconv structure lc is filled with formatting data.