cfitisio/wcslib inheritance

Is there a simple way to inherit the primary header when using
fits_hdr2str and wcspih ? The particular case being, EQUINOX and
RADESYS are in the primary (which has NAXIS = 0) and the rest
of the WCS in the extesions of a MEF.

If I concatenate the strings from hdr2str for the primary and
each extension, will wcspih skim past the initial dataless
header?

Pete.