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! MSGMAC.REQ  --  Some general purpose definitions for PRETTY


!++
! Facility:  PRETTY
!
! Abstract:
!
!	This file contains the $BLF_MESSAGE macro. 
!
! Environment:  Transportable
!
! Creation Date:  MAY 1981
!
!--


! This file assumes that the declaration
!
!	LIBRARY 'XPORT:' ;
!
! or equivalent has already appeared in the program.



!++
! What follows is the set of declarations that are needed by any module
! that makes calls to the message facility.
!
!   This set of declarations includes:
!
!      - The declaration of the keyword macro that serves as the interface
!        to the message facility.
!      - An External Literal declaration referring to the message codes
!        that are declared in the error message file.
!      - A Literal declaration defining the integer codes that
!        specify the type of error message to be written.
!      - An External Routine declaration referring to the routine
!        that the macro calls. The actual routine is declared in
!        its own separate module (MSGMOD.BLI).
!
!--

!
! MACROS:
!

KEYWORDMACRO

   $blf_message  ( type    = -1 ,
                   code    = -1 ,
                   xcode   = -1 ,
                   string  =    ,
                   fao1    = -1 ,
                   fao2    = -1                               ) =

      !+
      ! The main action of the macro is to call the routine BLF$_MSG.
      !
      ! If the STRING parameter is specified in the macro call, the string
      ! information is stored in a local string descriptor and passed to the
      ! routine BLF$_MSG as the address of the descriptor.
      !
      ! If the STRING parameter is not specified in the call to the macro,
      ! then the dummy address -1 is passed as the address of the string 
      ! descriptor. The routine can check the value of the address to determine
      ! that no string was specified in the call to the macro.
      !-



      %IF %NULL (STRING) %THEN
         BLF$_MSG (type, code, xcode, -1, fao1, fao2)
      %ELSE
         BEGIN
         LOCAL
            str_desc : $STR_DESCRIPTOR () ;
         $STR_DESC_INIT (DESCRIPTOR = str_desc , %QUOTE STRING = string) ;
         BLF$_MSG (type, code, xcode, str_desc, fao1, fao2) ;
         END
      %FI                                                        % ;

!
! EXTERNAL REFERENCES:
!

EXTERNAL LITERAL

!+
! The following literals are the message codes.
! When SIGNAL is called to signal an error, the message associated
! with the error is indicated by the message code.
!
! If any messages are added, deleted, of modified in the message file
! it is necessary to update this list of external
! references. At any given time, this list should be in one-to-one
! correspondence with the messages in the message file.
!-

   PRETTY_ERRSFOUND,
   PRETTY_BADINFILE ,
   PRETTY_BADOUTFIL ,
   PRETTY_BADLISFIL ;

!+
! The routine that does the message writing is declared as a global routine
! in its own module. Any module that calls it must have this External
! Routine declaration.
!
! The %DECLARED stuff is needed because the module that contains the
! message handling routine also contains this require file.
!-

   %IF NOT %DECLARED (blf$_msg) %THEN
      EXTERNAL ROUTINE
         blf$_msg ;
   %FI


!
! EQUATED SYMBOLS:
!

LITERAL

   !+
   ! These literals are integer codes that the caller uses to specify 
   ! the type of message to be written.
   !-

   output = 1 ,                   ! Type = Output
   debug  = 2 ,                   ! Type = Debug
   xport  = 3 ,                   ! Type = Xport

   success       = 4 ,            ! Type = Standard Message
   informational = 4 ,
   warning       = 4 ,
   error         = 4 ,
   fatal         = 4 ;

!++
!  End of declarations needed for the message handling facility
!--


! MSGMAC.REQ --  LAST LINE