mface_put_prop -

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
       Documentation License <http://www.gnu.org/licenses/fdl.html>.

Version 1.8.4                                    Mon Sep 25 2023                           mface_put_prop(3m17n)

       Set a value of a face property. The mface_put_prop() function assigns val to the property whose key is
       key in face face.  key must be one the followings:

       #Mforeground, #Mbackground, #Mvideomode, #Mhline, #Mbox,
       #Mfoundry, #Mfamily, #Mweight, #Mstyle, #Mstretch, #Madstyle,
       #Msize, #Mfontset, #Mratio, #Mhook_func, #Mhook_arg

        Among them, font related properties (Mfoundry through Msize) are used as the default values when a font
       in the fontset of face does not specify those values.

       The actual type of the returned value depends of key. See documentation of the above keys.

           MERROR_FACE

       mface_put_prop -

           If the operation was successful, mface_put_prop() returns 0. Otherwise it returns -1 and assigns an
           error code to the external variable merror_code.

mface_get_prop()

       int mface_put_prop (MFace * face, MSymbol key, void * val)