NAME

       mtext_get_prop_keys - Get a list of text property keys at a position of an M-text.

SYNOPSIS

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

DESCRIPTION

       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.

RETURN VALUE

           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.

ERRORS

           MERROR_RANGE

SEE ALSO

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

COPYRIGHT

       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>.