Set the value of the current long error message.

   ERROR

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   message    I   A long error message.

   message        A ``long'' error message.
                  message is a detailed description of the error.
                  message is supposed to start with the name of the
                  module which detected the error, followed by a
                  colon.  Example:

                     "rdtext_c:  There are no more free logical units"

                  Only the first LMSGLN (see setmsg.c) characters of
                  message are stored; any further characters are
                  truncated.

                  Generally, message will be stored internally by the
                  CSPICE error handling mechanism.  The only exception
                  is the case in which the user has commanded the
                  toolkit to ``ignore'' the error indicated by message.

                  As a default, message will be output to the screen.
                  See the required reading file for a discussion of how
                  to customize toolkit error handling behavior, and
                  in particular, the disposition of message.

   None.

   None.

   The CSPICE routine sigerr_c should always be called
   AFTER this routine is called, when an error is detected.

   The effects of this routine are:

      1.  If acceptance of a new long error message is
          allowed:

          message will be stored internally.  As a result,
          The CSPICE routine, getmsg_ , will be able to
          retrieve message, until message has been ``erased''
          by a call to reset_c, or overwritten by another
          call to setmsg_c.


      2.  If acceptance of a new long error message is not allowed,
          a call to this routine has no effect.

    In the following example, an error is signaled because the
    double precision variable x contains an invalid value.  The
    value of x and the maximum allowed value MAXVAL are substituted
    into the error message at the locations indicated by the # signs
    below.

       /.
       Indicate that x is out of range if x is too large.
       ./

       if ( x > MAXVAL )
       {
          setmsg_c ( "Variable x = #; maximum allowed value is #" );
          errdp_c  ( "#",  x                                      );
          errdp_c  ( "#",  MAXVAL                                 );
          sigerr_c ( "SPICE(VALUEOUTOFRANGE)"                     ) ;
          return;
       }

   sigerr_c must be called once after each call to this routine.

   This routine does not detect any errors.

   However, this routine is part of the interface to the
   CSPICE error handling mechanism.  For this reason,
   this routine does not participate in the trace scheme,
   even though it has external references.

   None.

   N.J. Bachman    (JPL)

   None.

   -CSPICE Version 1.2.1, 25-MAR-1998 (EDW)

      Corrected errors in header.

   -CSPICE Version 1.2.0, 08-FEB-1998 (NJB)

      Re-implemented routine without dynamically allocated, temporary
      strings.  Made various header fixes.

   -CSPICE Version 1.0.0, 25-OCT-1997 (EDW)

   set long error message