=pod

=head1 NAME

unibi_add_ext_bool, unibi_add_ext_num, unibi_add_ext_str - add extended capabilities to a terminal object

=head1 SYNOPSIS

 #include <unibilium.h>

 size_t unibi_add_ext_bool(unibi_term *ut, const char *t, int b);
 size_t unibi_add_ext_num(unibi_term *ut, const char *t, int v);
 size_t unibi_add_ext_str(unibi_term *ut, const char *t, const char *s);

=head1 DESCRIPTION

Add an extended boolean, numeric, or string capability with the specified
name and value.

Note that these functions simply store any pointers they are given. They will
not free I<t> or I<s> or copy any strings.

=head1 RETURN VALUE

The return value is the index of the new capability, which can be used in
L<unibi_get_ext_bool(3)>, L<unibi_set_ext_bool(3)>, etc. If an error occurs,
C<SIZE_MAX> is returned.

=head1 SEE ALSO

L<unibilium.h(3)>,
L<unibi_del_ext_bool(3)>,
L<unibi_del_ext_num(3)>,
L<unibi_del_ext_str(3)>

=cut