mtext_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                           mtext_put_prop(3m17n)

       @brief Set a text property.

       The mtext_put_prop() function sets a text property to the
       characters between @b from (inclusive) and @b to (exclusive) in M-text
       @b mt.  @b key and @b val specify the key and the value of the text
       property.  With this function,

                            FROM                   TO
       M-text: |<------------|-------- MT ---------|------------>|
       PROP  :  <------------------ OLD_VAL -------------------->

       becomes

                            FROM                   TO
       M-text: |<------------|-------- MT ---------|------------>|
       PROP  :  <-- OLD_VAL-><-------- VAL -------><-- OLD_VAL-->

       @par Return value:
       If the operation was successful, mtext_put_prop() returns 0.
       Otherwise it returns -1 and assigns an error code to the external
       variable #merror_code.

       @par Errors:
       @c MERROR_RANGE, @c MERROR_SYMBOL

       @par See Also:
       mtext_put_prop_values(), mtext_get_prop(),
       mtext_get_prop_values(), mtext_push_prop(),
       mtext_pop_prop(), mtext_prop_range()

       mtext_put_prop -

       int mtext_put_prop (MText * mt, int from, int to, MSymbol key, void * val)