*DECK HLSTDX
USETEXT NIPDEF
USETEXT ACB 
USETEXT ACNB
USETEXT ACNT
USETEXT APPSTAT 
USETEXT AT
USETEXT NWLNTRY 
USETEXT OVERLAY 
USETEXT PARAMS
USETEXT SUPMSG
      PRGM HLSTDX;           # PROCESS A HALF/FULL DUPLEX MODE         #
      BEGIN 
*IF DEF,IMS 
 STARTIMS;
 #
*1DC  HLSTDX
* 
*     1.PROC NAME            AUTHOR              DATE 
*        HLSTDX              S.KRULEVITCH        79/02/28 
* 
*     2. FUNCTIONAL DESCRIPTION.
*        PROCESS LST/HDX AND LST/FDX SUPERVISORY MESSAGES TO ALLOW
*        SELECTION/DESELECTION OF HALF DUPLEX MODE ON/ FULL DUPLEX MODE 
* 
*     3. METHOD USED. 
*        DETERMINE OF LST/FDX OR LST/HDX
*        NONZERO ACN: 
*        FOR ALL ACTIVE CONNECTIONS (IF ACN IS ZERO) OR 
*        FOR A SPECIFIC CONNECTION (IF ACN IS NON-ZERO) 
*        DO THE FOLLOWING 
*          UPDATE THE HALF DUPLEX MODE FLAG 
*          IF FULL DUPLEX - CLEAR THE TEMPORARY LIST OFF FLAG 
*          IF HALF DUPLEX AND THE INITIAL STATE OF THE
*          CONNECTION IS DISABLED - SET THE TEMPORARY 
*          LIST OFF FLAG (ELSE CLEAR THE TLO FLAG). 
*          LOCATE  ACNB ON NONZERO CONNECTION 
*          IF ACNB NOT FOUND, RETURN A LOGICAL ERROR
*          IF ACNB FOUND
*            CLEAR OR SET HALF DUPLEX MODE FLAG 
*            IF LST/FDX ALSO CLEAR TEMPORARY LIST FLAG
*        ZERO ACN:  
*          CLEAR OR SET HALF DUPLEX FLAG IN ACB 
*          FOR EACH ACTIVE CONNECTION"S  ACNB 
*            CLEAR OR SET HALF DUPLEX MODE FLAG 
*            IF LST/FDX ALSO CLEAR TEMPORARY LIST OFF FLAG
* 
*     4. ENTRY PARAMETERS.
*          ACBADDR           CURRENT ACB ADDRESS
*          WLADDR            CURRENT WORKLIST ENTRY 
* 
*     5. EXIT PARAMETERS. 
*          ACNBH             HALF DUPLEX MODE FLAG
*          ACNBTLO           TEMPORARY LIST OFF FLAG
* 
*     6. COMDECKS CALLED AND SYMPL TEXTS USED.
*        ACB    ACNB    ACNT   APPSTAT   AT 
*        NIPDEF  NWLNTRY  OVERLAY   PARAMS    PT
*        SUPMSG 
* 
*     7. ROUTINES AND OVERLAYS CALLED 
*          HLGLERR      OVL  ISSUE LOGICAL ERROR
*          HUPDDAW           UPDATE DATA AVAILABLE WORD 
*          OVLCALL           LOAD OVERLAY 
*          XTRACE            TRACE CALLS
* 
*     8. DAYFILE MESSAGES AND OTHER IMPORTANT INFORMATION.
* 
*        W A R N I N G - THIS PROGRAM CANNOT EXCEED THE PRIMARY 
*CALL OPSIZE
* 
*        THIS OVERLAY IS CALLED BY HPPUT. 
* 
 #
 STOPIMS; 
*ENDIF
# 
      EXTERNAL VARIABLES
# 
      XREF
        BEGIN 
        PROC HUPDDAW;        # UPDATE DATA AVAILABLE WORD              #
        PROC OVLCALL;        # LOAD OVERLAY                            #
        PROC XTRACE;         # TRACE CALLS                             #
        LABEL RJMAIN;        # RETURN ADDRESS IN OVLCALL               #
        END 
  
# 
      INTERNAL VARIABLES
# 
      ITEM HDXFLAG      B;   # TRUE IF LST/HDX MESSAGE BEING PROCESSED #
      ITEM I            I;   # FOR LOOP VARIABLE                       #
  
#**********************************************************************#
      CONTROL IFEQ DEBUG,1; 
         XTRACE("HLSTD") ;
      CONTROL FI; 
      P<NWLENTRY> = WLADDR;  # CURRENT WORKLIST ENTRY                  #
      P<SUPMSG> = WLADDR + AIPHSIZE + ABHSIZE;
# 
      F I N D  A C N B  -  A D D R E S S
# 
      P<ACB> = ACBADDR; 
      P<ACNT> = ACBACNT[0]; 
  
                             # LOCATE LST MESSAGE                      #
      IF SFC[0] EQ HDX
      THEN                   # TURN ON HALF DUPLEX MODE                #
        HDXFLAG = TRUE; 
  
      ELSE                   # TURN ON FULL DUPLEX MODE                #
        HDXFLAG = FALSE;
  
      IF LSTACN[0] NQ 0 
      THEN                   # CHANGE DUPLEX MODE FOR SPECIFIC         #
        BEGIN                # CONNECTION                              #
        P<ACNB> = ACNTACNB[LSTACN[0] + ACNTHSIZE - ACNTMINACN[0]];
        IF P<ACNB> EQ 0 OR LSTACN[0]
           LS ACNTMINACN[0] OR LSTACN[0]
           GR ACNTHCN[0]
        THEN                 # ACNB NOT FOUND                          #
          BEGIN 
          PARAMS1 = RLG"ACN";# ILLEGAL ACN                             #
          OVLNAME = HLGLERRP; 
          OVLCALL;           # LOAD PROGRAM INTO OVERLAY               #
          GOTO HLSTDXX; 
  
          END 
  
        ACNBH[0] = HDXFLAG;  # SET OR CLEAR HALF DUPLEX FLAG           #
        IF NOT HDXFLAG       # FULL DUPLEX MODE                        #
        THEN
        BEGIN                # FULL DUPLEX                             #
          IF ACNBTLO[0] 
          THEN               # CONNECTION CURRENTLY IN TEMP LIST OFF   #
            BEGIN 
            ACNBTLO[0] = FALSE; # CLEAR TEMP LIST OFF CONDITION        #
            HUPDDAW(P<ACB>,P<ACNB>,0,ACNBBLKSQ[0]); 
            END 
  
        END                  # FULL DUPLEX                             #
        ELSE
        BEGIN                # HALF DUPLEX                             #
          IF LSTDIS[0]
          THEN               # CHECK INITIALLY LIST STATE FLAG         #
            BEGIN                        # SET TLO                     #
            IF NOT ACNBTLO[0]  # WAS TEMP LIST ON CONDITION            #
            THEN
              BEGIN 
              HUPDDAW(P<ACB>,P<ACNB>,0,-ACNBBLKSQ[0]);
              END 
  
            ACNBTLO[0] = TRUE ; 
            END                          # SET TLO                     #
          ELSE
            BEGIN 
            IF ACNBTLO[0] 
            THEN             # CONNECTION IN TEMP LIST OFF CONDITION   #
              BEGIN 
              ACNBTLO[0] = FALSE; # CLEAR TEMP LIST OFF CONDITION      #
              HUPDDAW(P<ACB>,P<ACNB>,0,ACNBBLKSQ[0]);  # UPDATE DELIVER#
              END 
            END 
        END                  # HALF DUPLEX                             #
        END 
  
      ELSE                   # CHANGE DUPLEX MODE ON ALL TERMINAL      #
        BEGIN                # APPLICATION CONNECTIONS                 #
        ATH[ACBAN[0]] = HDXFLAG;
        ATDIS[ACBAN[0]] = LSTDIS[0] ;    # SET INITIAL LIST STATE FLAG #
  
#       LOOP THROUGH ACTIVE CONNECTIONS                                #
  
        FOR I = ACNTHSIZE STEP 1
          UNTIL ACNTHCN[0] + ACNTHSIZE - ACNTMINACN[0]
        DO
          BEGIN 
          IF ACNTACNB[I] NQ 0 
          THEN               # ACTIVE CONNECTION                       #
            BEGIN 
            P<ACNB> = ACNTACNB[I];
            ACNBH[0] = HDXFLAG;         # SET OR CLEAR HALF DUPLEX FLAG#
            IF NOT HDXFLAG
            THEN                        # FULL DUPLEX MODE             #
              BEGIN              # FULL DUPLEX MODE                    #
              IF ACNBTLO[0] 
              THEN           # CONNECTION IN TEMP LIST OFF CONDITION   #
                BEGIN 
                ACNBTLO[0] = FALSE;  # CLEAR TEMP LIST OFF FLAG        #
                HUPDDAW(P<ACB>,P<ACNB>,0,ACNBBLKSQ[0]);  # UPDATE DELIV#
                END 
              END                # FULL DUPLEX MODE                    #
              ELSE
              BEGIN              # HALF DUPLEX MODE                    #
                IF LSTDIS[0]         #CHECK INITIAL LIST STATE         #
                THEN
                  BEGIN 
                  HUPDDAW(P<ACB>,P<ACNB>,0,-ACNBBLKSQ[0]); # UPDATE DEL#
                  ACNBTLO[0] = TRUE;       # FLAG,IF SET, SET TLO FLAG #
                  END 
                ELSE
                  BEGIN 
                  IF ACNBTLO[0] 
                  THEN           # CONNECTION IN TEMP LIST OFF CONDITIO#
                    BEGIN 
                    ACNBTLO[0] = FALSE;  # CLEAR TEMP LIST OFF FLAG    #
                    HUPDDAW(P<ACB>,P<ACNB>,0,ACNBBLKSQ[0]);  # UPDATE D#
                    END 
                  END 
              END                # HALF DUPLEX MODE                    #
            END 
  
          END 
  
        END 
  
HLSTDXX:  
      GOTO RJMAIN;
      END                    # HLSTDX                                  #
TERM