*DECK NBADBSN 
USETEXT NIPDEF
USETEXT AHEADER 
USETEXT KDIS
USETEXT NCNB
USETEXT SUPMSG
USETEXT PARAMS
  
 PRGM NBADBSN;               # PROCESS BAD BSN ON AN UPLINE BACK       #
  
 STARTIMS;
 #
*1DC  NBADBSN 
* 
*     1. PROC NAME           AUTHOR              DATE 
*        NBADBSN             L. T. NGUYEN        81/10/26 
* 
*     2. FUNCTIONAL DESCRIPTION 
*        LOCATE ACKQ ENTRY THAT HAS BSN MATCHED.
* 
*     3. METHOD USED
*        LOCATE THE ENTRY WITH MATCHING BSN (1ST FOR LOOP)
*        IF FOUND, FORM FC/NAK AND CALL HBSTTP TO SEND TO APPL. 
*        FROM THE HOST SIDE FOR ALL ENTRIES NOT IN SEQUENCE.
*        THEN RETURN TO CALLER WITH THE GOOD ENTRY ADDRESS. 
*        IF NOT FOUND, SET PARAMS3 TO ZERO. 
* 
*     4. ENTRY PARAMETERS 
*        PARAMS1 - NCNB ADDRESS 
*        PARAMS2 - BSN FROM CCP 
* 
*     5. EXIT PARAMETERS
*        PARAMS3 - 0 IF NO ACKQ ENTRY FOUND.
*                - OR ADDRESS OF ACKQ ENTRY HAS MATCHING BSN. 
* 
*     6. COMDECKS CALLED AND SYMPL TEXTS USED 
*        NIPDEF     PARAMS     AHEADER     SUPMSG 
*        ACNB     NCNB     ACKHEAD     OSSIZE 
*        KDIS 
* 
*     7. ROUTINES AND OVERLAYS CALLED 
*        MGETS - ALLOCATE BUFFER
*        XTRACE - TRACE PROCEDURE CALL
* 
*     8. DAYFILE MESSAGES AND OTHER IMPORTANT INFORMATION 
*        THIS IS A SECONDARY OVERLAY CALLED BY NPBACK.
*        W A R N I N G - THIS PROGRAM CANNOT EXCEED THE SECONDARY 
*CALL OSSIZE
      INPUT PARAMETERS - PARAMS1 = NCNB ADDRESS 
                         PARAMS2 = BSN OF THE UPLINE BLOCK
# 
 STOPIMS; 
  
# 
      EXTERNAL REFERENCES 
# 
      XREF
        BEGIN 
        PROC ABORT;          # ABORT NIP ON BAD BSN                    #
        PROC MGETS;          # GET BUFFER                              #
        PROC XTRACE;         # TRACE CALL                              #
        LABEL RJMAIN; 
        END 
# 
      LOCAL VARIABLES 
# 
      ITEM ACKHDR;           # ACKQ HEADER ADDRESS                     #
      ITEM BUFADDR;          # BUFFER ADDRESS FOR PSEUDO ACK/NAK(S)    #
      ITEM BUFSIZE;          # BUFFER SIZE                             #
      ITEM BSN;              # BLOCK SEQUENCE NUMBER                   #
      ITEM MATCH B;          # MATCH INDICATOR                         #
      ITEM I;                # INDUCTION VARIABLE                      #
      ITEM J;                # INDUCTION VARIABLE                      #
      ITEM OUTPTR;           # ACKQ OUT POINTER                        #
  
      ARRAY MSG$BADBSN [0:0] S(3);
        BEGIN 
        ITEM MSG$TEXT   C(00,00,28) = # MESSAGE TEXT                   #
            ["NIP RECEIVED BAD BSN."];
        ITEM MSG$END    U(02,48,12) = [0];
        END 
  
      CONTROL EJECT;
  
      BEGIN # NBADBSN # 
  
      CONTROL IFEQ DEBUG,1; 
      XTRACE("NBBSN");       # TRACE CALL                              #
      CONTROL FI;            # END OF DEBUG CODE                       #
  
      IF KNAMDB[0]
      THEN                   # ABORT NAM ON BAD BSNS FROM NETWORK      #
        BEGIN 
        ABORT(MSG$BADBSN,0); # ABORT NAM                               #
        END 
  
      P<NCNB> = PARAMS1;     # NCNB ADDRESS                            #
      BSN = PARAMS2;         # UPLINE BSN                              #
      OUTPTR = NCNBAKOU[0]; # ACKQ OUT POINTER                         #
      ACKHDR = OUTPTR+ACKHSIZE; # FIRST ACKQ ENTRY                     #
      MATCH = FALSE; # PRESET TO NO MATCH                              #
  
      FOR I=0 STEP 1 WHILE NOT MATCH
                       AND OUTPTR NQ NCNBAKIN[0] # MORE ACKQ ENTRY     #
      DO # SCAN FOR MATCHING BSN IN ACKQ                               #
        BEGIN 
        P<AHEADER> = ACKHDR+OUTPTR; # CURRENT ACKQ ENTRY               #
        IF BSN EQ ABHADR[0] 
        THEN # BSN MATCH FOUND                                         #
          MATCH = TRUE; # TERMINATE ACKQ SEARCH                        #
        ELSE # NOT MATCH FOUND                                         #
          BEGIN 
          IF (OUTPTR+1) LS NCNBDBL[0] 
          THEN
            OUTPTR = OUTPTR+1;
          ELSE
            OUTPTR = 0; # RESET ACKQ OUT POINTER                       #
          END 
        END # I CONTAINS NUMBER OF ACKQ ENTRY(S) PROCESSED             #
  
      IF MATCH
      THEN # BSN MATCH, SEND FC/NAK(S) AND FC/ACK TO APPLICATION       #
        BEGIN 
        MGETS(I+BLKHSIZE,BUFADDR,TRUE); # GET BUFFER FOR ACK/NAK       #
        FOR J=BLKHSIZE STEP 1 WHILE J LQ I
        DO # FORMAT PSEUDO ACK/NAK ENTRY(S)                            #
          BEGIN 
          P<SUPMSG> = BUFADDR+J; # PSEUDO ENTRY                        #
          P<AHEADER> = ACKHDR+NCNBAKOU[0];
          IF BSN EQ ABHADR[0] 
          THEN # BSN MATCH, SEND FC/ACK                                #
            PFCSFC[0] = FCACK;
          ELSE # BSN MISMATCH, SEND FC/NAK                             #
            BEGIN 
            PFCSFC[0] = FCNAK;
            FCRNAK[0] = 1; # REASON CODE FOR NAK                       #
            END 
          FCABN[0] = ABHABN[0]; # SET ABN                              #
  
          IF (NCNBAKOU[0]+1) GQ NCNBDBL[0]
          THEN
            NCNBAKOU[0] = 0;
          ELSE
            NCNBAKOU[0] = NCNBAKOU[0]+1;
          NCNBNBO[0] = NCNBNBO[0]-1; # DECREMENT NBO COUNT             #
          END 
  
        PARAMS3 = BUFADDR; # RETURN PSEUDO ENTRY ADDRESS               #
        END 
  
      ELSE # NO MATCHING BSN FOUND IN ACKQ, IGNORE BACK                #
        PARAMS3 = 0; # NO PSEUDO ENTRY TO PROCESS FOR HBSTTP           #
  
      GOTO RJMAIN;
      END # NBADBSN # 
      TERM