mtext_get_prop_keys -

       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                      mtext_get_prop_keys(3m17n)

       Get a list of text property keys at a position of an M-text. The mtext_get_prop_keys() function creates
       an array whose elements are the keys of text properties found at position pos in M-text mt, and sets
       *keys to the address of the created array. The user is responsible to free the memory allocated for the
       array.

           MERROR_RANGE

       mtext_get_prop_keys -

           If the operation was successful, mtext_get_prop_keys() returns the length of the key list. Otherwise
           it returns -1 and assigns an error code to the external variable merror_code.

mtext_get_prop(), mtext_put_prop(), mtext_put_prop_values(), mtext_get_prop_values(),
           mtext_push_prop(), mtext_pop_prop()

       int mtext_get_prop_keys (MText * mt, int pos, MSymbol ** keys)