!TITLE Source of COMPARE
!<
%SYSTEMINTEGERFNSPEC pd addr(%STRING(255) FILE)
%SYSTEMINTEGERMAPSPEC COMREG(%INTEGER I)
%EXTERNALINTEGERFN SSFAIL
   %RESULT=COMREG(24)
%END
%EXTERNALROUTINESPEC DEFINE(%STRING(255) STREAMS)
%EXTERNALROUTINESPEC SSFOFF
%SYSTEMSTRINGFNSPEC FAILURE MESSAGE(%INTEGER I)

%EXTERNALROUTINE COMPARE(%STRING(255)STREAMS); !COMPARE FILES A LA hd
%STRING(63)IN1,IN2,OUT
%CONSTINTEGER MAX=16, LINEMAX=128
%CONSTINTEGER NONE=0
%INTEGER ASTREAM,BSTREAM
%OWNINTEGER SKIP=1;  !TO IGNORE BLANK LINES
%OWNINTEGER ABASE=0, BBASE=0, ACOUNT=0, BCOUNT=0
%INTEGER ANUM,BNUM,INSTREAM,END OF FILE,IN1END,IN2END
%INTEGERARRAY AA,BB(1:MAX*LINEMAX)

%INTEGERFN REM(%INTEGER N,D)
    %RESULT = N-N//D*D
%END

%INTEGERMAP A(%INTEGER I,J)
!    %RESULT == AA(REM(ABASE+I,MAX)*LINEMAX+J)
    %RESULT == AA(((ABASE+I)&15)<<7+J);  !FOR SPEED (**MAX=16**)
%END

%INTEGERMAP B(%INTEGER I,J)
!    %RESULT == BB(REM(BBASE+I,MAX)*LINEMAX+J)
    %RESULT == BB(((BBASE+I)&15)<<7+J)
%END

%ROUTINE REPLENISH(%INTEGERMAP X(%INTEGER I,J),%INTEGER N,%INTEGERNAME COUNT)
%INTEGER I,J,K
    %CYCLE I = MAX-N+1,1,MAX
       %SIGNAL %EVENT 9 %IF INSTREAM=END OF FILE
       K=BYTE INTEGER(INSTREAM) %AND INSTREAM=INSTREAM+1 %UNTIL K # NL %OR SKIP = 0 %C
          %OR INSTREAM=END OF FILE
       %CYCLE J = 1,1,LINEMAX
          X(I,J) = K
          %EXIT %IF K = NL
          %RETURN %IF INSTREAM=END OF FILE
          K=BYTE INTEGER(INSTREAM); INSTREAM=INSTREAM+1
       %REPEAT
       COUNT = COUNT+1
    %REPEAT
%END

%ROUTINE PRINT(%INTEGERMAP X(%INTEGER I,J),%INTEGER N,CODE)
%INTEGER I,J
    %RETURN %IF N = 0
    %CYCLE I = 1,1,N
       PRINT SYMBOL(CODE);  PRINT SYMBOL(':');  SPACE
       J = 0
       J = J+1 %AND PRINT SYMBOL(X(I,J)) %UNTIL X(I,J) = NL
    %REPEAT
%END

%INTEGERFN DIFF(%INTEGER AL,BL)
%INTEGER J
    %IF AL > ACOUNT %OR BL > BCOUNT %START
       %RESULT = 0 %IF AL > ACOUNT %AND BL > BCOUNT
       %RESULT = 1
    %FINISH
    %CYCLE J = 1,1,LINEMAX
       %RESULT = 1 %IF A(AL,J) # B(BL,J)
       %RESULT = 0 %IF A(AL,J) = NL
    %REPEAT
    %RESULT = 0
%END

%ROUTINE FIND MATCH(%INTEGERNAME AN,BN)
%INTEGER I,J
    %CYCLE I = 1,1,MAX
       AN=I %AND BN=I %AND %RETURN %IF DIFF(I,I) = 0
       %IF I # 1 %START;  %CYCLE J = 1,1,I-1
          AN=I %AND BN=J %AND %RETURN %IF DIFF(I,J) = 0
          AN=J %AND BN=I %AND %RETURN %IF DIFF(J,I) = 0
       %REPEAT;  %FINISH
    %REPEAT
    AN = MAX+1;  BN = MAX+1
%END

%ON %EVENT 9 %START
   %STOP
%FINISH


OUT = ".OUT"
%UNLESS (STREAMS -> IN1.("/").OUT %C
   %AND IN1 -> IN1.(",").IN2) %C
   %OR STREAMS -> IN1.(",").IN2 %START
   PRINTSTRING("Compare IN1,IN2/Out")
   NEWLINE
   %STOP
%FINISH

SSFOFF
ASTREAM=pd addr(IN1)
BSTREAM=pd addr(IN2)

%IF ASTREAM<=0 %OR BSTREAM<=0 %START
   PRINTSTRING("COMPARE FAILS - CANNOT ACCESS INPUT FILE")
   NEWLINE
   %STOP
%FINISH

%IF INTEGER(ASTREAM+12)#3 %OR INTEGER(BSTREAM+12)#3 %START
   PRINTSTRING("COMPARE FAILS - NOT A TEXT FILE")
   NEWLINE
   %STOP
%FINISH

IN1END=INTEGER(ASTREAM)+ASTREAM
IN2END=INTEGER(BSTREAM)+BSTREAM

ASTREAM=ASTREAM+INTEGER(ASTREAM+4)
BSTREAM=BSTREAM+INTEGER(BSTREAM+4)


DEFINE("4,".OUT)

%IF SSFAIL#0 %START
   PRINTSTRING("Compare fails - ".FAILURE MESSAGE(SSFAIL));NEWLINE
   %STOP
%FINISH

SELECT OUTPUT(4)


    ANUM = MAX;  BNUM = MAX
    %CYCLE
       INSTREAM=ASTREAM
       END OF FILE=IN1END
       REPLENISH(A,ANUM,ACOUNT)
       ASTREAM=INSTREAM
       INSTREAM=BSTREAM
       END OF FILE=IN2END
       REPLENISH(B,BNUM,BCOUNT)
       BSTREAM=INSTREAM
       %EXIT %IF ACOUNT <= 0 %AND BCOUNT <= 0
       FIND MATCH(ANUM,BNUM)
       %IF ANUM # 1 %OR BNUM # 1 %START
          PRINT(A,ANUM-1,'1')
          PRINT(B,BNUM-1,'2')
          NEWLINE
       %FINISH
       ABASE = ABASE+ANUM;  ACOUNT = ACOUNT-ANUM
       BBASE = BBASE+BNUM;  BCOUNT = BCOUNT-BNUM
    %REPEAT
%END
%ENDOFFILE

!>