*DECK     CSCANT
USETEXT TEXTCS
USETEXT TEXTSS
USETEXT TXTAPSS 
PROC CSCANT;
# TITLE CSCANT - ACCEPT NOP TYPEIN.   # 
  
      BEGIN  # CSCANT # 
# 
**    CSCANT - ACCEPT NOP TYPEIN. 
* 
*     D. G. DEPEW.           81/06/05.
* 
*     THIS PROCEDURE HANDLES INBOUND DATA (SYNCHRONOUS) BLOCKS FROM THE 
*     NETWORK.  ITS FUNCTION IS TO FORWARD THE TYPEIN TO THE I-LAYER
*     (FOR COMMAND PROCESSING) OR DISCARD IT, AS APPROPRIATE. 
* 
*     ENTRY    WCBUF[0] = WORD COUNT WORD FROM ORIGINAL CONNECTION
*                         TRAFFIC QUEUE (*CNQ*) ENTRY.
*             ABHBUF[0] = APPLICATION BLOCK (EVENT) HEADER FOR THE DATA 
*                         (BASED ARRAY *ABH* IN *TXTAPSS* POINTS HERE). 
*             MSGBUF[0] = DISPLAY CODED TEXT LINE (BASED ARRAY *APSM* 
*                         IN *TXTAPSS* POINTS HERE).
* 
*     EXIT    ONE OF THE FOLLOWING: 
*             - AN ENTRY FOR THE TYPEIN IS PLACED IN THE OPERATOR 
*               TYPEIN QUEUE (*OPTQ*) AND THE STATE IS UPDATED. 
*             - THE TYPEIN IS IGNORED.
*             - THE TYPEIN IS DISGARDED AND A TERMINAL TEXT ENTRY 
*               CONTAINING THE MESSAGE *INPUT IGNORED..* IS PLACED IN 
*               CONNECTION TRAFFIC QUEUE (*CNQ*). 
* 
*     NOTES   1. CS ONLY PROCESSES *MSG* TYPE NETWORK BLOCKS.  ANY
*                OTHER TYPE OF SYNCHRONOUS INBOUND DATA (*BLK* BLOCKS 
*                AND TRANSPARENT MODE INPUT) IS IGNORED AND THE MESSAGE 
*                *INPUT IGNORED..* IS SENT TO THE TERMINAL. 
*             2. THE PROCESSING IS DEFINED BY THE CS/NOP C-LAYER STATE
*                DIAGRAM. 
# 
  
# 
****  PROC CSCANT - XREF LIST.
# 
      XREF
        PROC SSTAQE;         # ACCEPT QUEUE ENTRY                      #
# 
****
# 
  
  
      DEF  IGTLW$  #2#;      # *INPUT IGNORED..* TEXT LENGTH IN WORDS  #
  
  
      ITEM NACN;             # NOP ACN = ORDINAL OF ACN LIST ENTRY     #
  
  
# 
*     ABH AND SM BODY ARRAYS FOR LST/ON/SM. 
# 
      ARRAY LONABH [00:00] S(1);
        BEGIN 
        ITEM LOH$ABT    U(00,00,06) = [APPCMD];       # BLOCK TYPE     #
        ITEM LOH$ADRABN U(00,06,30) = [0];            # ADDR, BLOCK NR #
        ITEM LOH$ACT    U(00,36,04) = [CT60TRANS];    # CHARACTER TYPE #
        ITEM LOH$DBC    U(00,40,08) = [0];            # CLARIFIER      #
        ITEM LOH$TLC    U(00,48,12) = [LLST];         # TEXT LENGTH    #
        END 
  
      ARRAY LONSM [00:00] S(1); 
        BEGIN 
        ITEM LOM$PSFC   U(00,00,16) = [LSTON];        # PFC/SFC        #
        ITEM LOM$RES1   U(00,16,08) = [0];            # RESERVED       #
        ITEM LOM$ACN    U(00,24,12);                  # CONNECTION NUM #
        ITEM LOM$RES2   U(00,36,24) = [0];            # RESERVED       #
        END 
  
      ARRAY IGNORE [00:00] S(IGTLW$); 
        BEGIN 
        ITEM I$TEXT     C(00,00,15) = ["INPUT IGNORED.."];
        ITEM I$ZERO     U(01,30,30) = [0];
        END 
  
  
  
  
  
# 
*     SAVE THE NOP'S ACN NUMBER.  TAKE A MAIN BRANCH DEPENDING UPON THE 
*     APPLICATION BLOCK TYPE. 
# 
      NACN = ABHADR[0]; 
  
  
  
      IF ABHABT[0] EQ APMSG 
      THEN                             # MUST PROCESS THIS BLOCK       #
        BEGIN 
  
  
# 
*       IF THE CONNECTION IS ACTIVE, FORWARD THE TYPEIN TO THE I-LAYER
*       AND SET THE STATE OF THE CONNECTION TO INDICATE THAT A COMMAND
*       IS IN PROGRESS.  HOWEVER, IF THE CANCEL INPUT FLAG IS SET,
*       IGNORE THE TYPEIN AND ISSUE A LST/ON/SM TO TURN AROUND THE
*       HALF DUPLEX OPERATION.  DISCARD THE TEXT FOR ANY OTHER STATE. 
# 
        IF ACN$NOPST[NACN] EQ S"ACTIVE" 
        THEN                           # ALL IS WELL                   #
          BEGIN 
          IF ABHCAN[0] NQ 0 
          THEN                         # HOP HAS CANCELLED TYPEIN      #
            BEGIN 
            WCB$WORD[1] = LLST + 2; 
            LOM$ACN[0]  = NACN; 
            SSTAQE (P<OTQ>, WCBUF[1], LONABH[0], LONSM[0]); 
            END 
          ELSE
            BEGIN 
            SSTAQE (P<OPTQ>, WCBUF[0], ABHBUF[0], MSGBUF[0]); 
            ACN$NOPST[NACN] = S"COMMAND"; 
            END 
          END 
  
# 
*       IF THE CONNECTION IS IN THE CLEAR INPUT STATE, THEN SEND A
*       LST/ON/R TO GET THE NEXT MSG BLOCK. 
# 
        ELSE IF ACN$NOPST[NACN] EQ S"CLEARI"
        THEN
          BEGIN 
          WCB$WORD[1] = LLST + 2; 
          LOM$ACN[0] = NACN;
  
          SSTAQE(P<OTQ>, WCBUF[1], LONABH[0], LONSM[0]);
          END 
  
        END                  # *MSG* BLOCK                             #
  
  
  
      ELSE                   # UNACCEPTABLE INPUT                      #
        BEGIN 
  
  
# 
*       DISCARD THE INPUT BLOCK.  IF IT IS A *BLK* BLOCK OR TRANSPARENT 
*       INPUT, AND THE CONNECTION IS ACTIVE, SEND THE *INPUT IGNORED..* 
*       MESSAGE.  (I.E., DON'T SEND THE MESSAGE FOR OTHER CONDITIONS
*       SUCH AS A NULL BLOCK WITH THE BREAK OCCURRED FLAG SET.) 
# 
        IF ACN$NOPST[NACN] EQ S"ACTIVE" 
          AND (ABHABT[0] EQ APPBLK  OR  ABHXPT[0] EQ 1) 
        THEN
          BEGIN 
          WCB$WORD[1] = IGTLW$ + 2;    # TERM TEXT NTRY SIZ, IAF=FALSE #
          WCB$SMID[1] = SMID"TTEXT";
          SSTAQE (P<CNQ>, WCBUF[1], ABHBUF[0], IGNORE); 
          END 
  
        END                  # UNACCEPTABLE INPUT                      #
  
      END  # CSCANT # 
  
      TERM