mtext_character -

       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_character(3m17n)

       Search a character in an M-text. The mtext_character() function searches M-text mt for character c. If
       from is less than to, the search begins at position from and goes forward but does not exceed (to - 1).
       Otherwise, the search begins at position (from - 1) and goes backward but does not exceed to. An invalid
       position specification is regarded as both from and to being 0.

       mtext_character -

           If c is found, mtext_character() returns the position of its first occurrence. Otherwise it returns
           -1 without changing the external variable merror_code. If an error is detected, it returns -1 and
           assigns an error code to the external variable merror_code.

mtext_chr(), mtext_rchr()

       int mtext_character (MText * mt, int from, int to, int c)