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BITTEST.PRG
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1991-08-16
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8KB
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240 lines
/*
* File......: BITTEST.PRG
* Author....: Forest Belt, Computer Diagnostic Services, Inc.
* Date......: $Date: 15 Aug 1991 23:02:54 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/bittest.prv $
*
* This is an original work by Forest Belt and is placed in the
* public domain.
*
* Execution times on 286/10Mhz clone machine Execute times
* -------------
* FT_ISBIT Test any bit in a byte 2 MSEC
* FT_BITSET Set one bit in a byte 1 MSEC
* FT_BITCLR Clear one bit in a byte 2 MSEC
*
* FT_BYTEAND AND two bytes together, return result 27 MSEC
* FT_BYTEOR OR two bytes together, return result 36 MSEC
* FT_BYTEXOR XOR two bytes together, return result 38 MSEC
* FT_BYTENOT Return one's complement of a byte 19 MSEC
* FT_BYTENEG Return two's complement of a byte 20 MSEC
*
* FT_BYT2BIT Return bit (binary) representation of byte
* FT_BYT2HEX Return hexadecimal representation of byte
*
* MODIFICATION HISTORY:
* ---------------------
*
* $Log: E:/nanfor/src/bittest.prv $
*
* Rev 1.2 15 Aug 1991 23:02:54 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:51:02 GLENN
* Minor edit to file header
*
*/
#IFDEF FT_TEST
FUNCTION MAIN()
SET CONFIRM ON
CLEAR
@ 1,2 TO 23,77 DOUBLE // make a border box
SETCOLOR("w+/n")
@ 1,5 SAY "[ BIT MANIPULATIONS DEMONSTRATOR - NANFOR.LIB ]"
DO WHILE .t. // MAIN LOOP
@ 2,3 CLEAR TO 22,76 // clear the box
SETCOLOR("n/w") // reverse box for instructions
@ 5,5 CLEAR TO 20,74
@ 7, 10 SAY "DO YOU WANT TO DEMONSTRATE..."
@ 9, 15 SAY "1 - Bit Test, Set, Clear"
@ 10, 15 SAY "2 - Bit-Wise Logical Manipulations"
@ 12, 15 SAY "0 - Exit from here"
@ 14, 10 SAY "Select by Number"
nSlct := 0
DO WHILE (nSlct < 48 .OR. nSlct > 50)
nSlct := INKEY(0)
END
IF nSlct == 48
EXIT
END
DO WHILE .t. // OPERATIONS LOOP
SETCOLOR("w/n")
@ 2,3 CLEAR TO 22,76 // clear the box
@ 3,10 SAY ;
"Use numeric value of the byte(s) you wish to test. This"
@ 4,10 SAY ;
"makes it easier to evaluate what's happening bit-wise."
@ 11,10 SAY "Leave blanks empty to Quit"
cInbyte1 := SPACE(3)
IF nSlct == 49
cInbyte2 := SPACE(1)
@ 6,15 SAY "Byte value: " GET cInbyte1 picture "###"
@ 8,15 SAY "Bit position: " GET cInbyte2 picture "#"
ELSE
cInbyte2 := SPACE(3)
@ 6,10 SAY "First byte value: " GET cInbyte1 picture "###"
@ 8,10 SAY "Second byte value: " GET cInbyte2 picture "###"
END
READ
IF EMPTY(cInbyte1) .AND. EMPTY(cInbyte2)
EXIT
END
@ 3,10 SAY SPACE(60) // Cleanup display
@ 4,10 SAY SPACE(60)
@ 11,10 SAY SPACE(40)
// Validations
IF EMPTY(cInbyte1)
QQOUT(CHR(7))
@ 6,36 SAY "NEED BOTH VALUES"
INKEY(3)
LOOP
END
IF (nSlct == 49 ;
.AND. (VAL(cInbyte1) > 255 .OR. VAL(cInbyte2) > 7)) ;
.OR. (nSlct == 50 ;
.AND. (VAL(cInbyte1) > 255 .OR. VAL(cInbyte2) > 255))
QQOUT(CHR(7))
@ 6,36 SAY "0 - 255"
IF nSlct == 49
@ 8,36 SAY "0 - 7"
END
INKEY(3)
LOOP
END
// assign values in correct types
nBytval := VAL(cInbyte1)
nBitpos := VAL(cInbyte2)
IF nSlct == 49
cByte1 := CHR(nBytval)
ELSE
cByte1 := cByte3 := cByte5 := cByte7 := cByte8 := CHR(nBytval)
cByte2 := cByte4 := cByte6 := CHR(nBitpos)
END
// Headings
@ 3,28 SAY "Bit No. 7654 3210"
@ 3,49 SAY "Hex"
@ 3,55 SAY "Dec"
@ 3,61 SAY "ASCII"
@ 4,36 SAY REPLICATE(CHR(25),4)+" "+REPLICATE(CHR(25),4)
@ 4,49 SAY "---"
@ 4,55 SAY "---"
@ 4,61 SAY "-----"
@ 6,36 SAY FT_BYT2BIT(cByte1) // full display 1st value
@ 6,49 SAY FT_BYT2HEX(cByte1)
@ 6,55 SAY STR(ASC(cByte1),3)
@ 6,63 SAY cByte1
IF nSlcT == 49
// full displays of manipulated bytes
@ 10,22 SAY "TEST Bit " + STR(nBitpos,1)
@ 10,38 SAY IIF(FT_ISBIT(cByte1,nBitpos), ;
"* It is SET *","* It is CLEAR *")
cByte3 := FT_BITSET(cByte1,nBitpos)
@ 12,22 SAY "SET Bit " + STR(nBitpos,1)
@ 12,36 SAY FT_BYT2BIT(cByte3)
@ 12,49 SAY FT_BYT2HEX(cByte3)
@ 12,55 SAY STR(ASC(cByte3),3)
@ 12,63 SAY cByte3
cByte5 := FT_BITCLR(cByte1,nBitpos)
@ 14,22 SAY "CLEAR Bit " + STR(nBitpos,1)
@ 14,36 SAY FT_BYT2BIT(cByte5)
@ 14,49 SAY FT_BYT2HEX(cByte5)
@ 14,55 SAY STR(ASC(cByte5),3)
@ 14,63 SAY cByte5
ELSE
@ 8,36 SAY FT_BYT2BIT(cByte2) // full display 2nd value
@ 8,49 SAY FT_BYT2HEX(cByte2)
@ 8,55 SAY STR(ASC(cByte2),3)
@ 8,63 SAY cByte2
// full displays of manipulated bytes
cByte1 := FT_BYTEAND(cByte1,cByte2)
@ 10,28 SAY "ANDed"
@ 10,36 SAY FT_BYT2BIT(cByte1)
@ 10,49 SAY FT_BYT2HEX(cByte1)
@ 10,55 SAY STR(ASC(cByte1),3)
@ 10,63 SAY cByte1
cByte3 := FT_BYTEOR(cByte3,cByte4)
@ 12,28 SAY "ORed"
@ 12,36 SAY FT_BYT2BIT(cByte3)
@ 12,49 SAY FT_BYT2HEX(cByte3)
@ 12,55 SAY STR(ASC(cByte3),3)
@ 12,63 SAY cByte3
cByte5 := FT_BYTEXOR(cByte5,cByte6)
@ 14,28 SAY "XORed"
@ 14,36 SAY FT_BYT2BIT(cByte5)
@ 14,49 SAY FT_BYT2HEX(cByte5)
@ 14,55 SAY STR(ASC(cByte5),3)
@ 14,63 SAY cByte5
cByte7 := FT_BYTENOT(cByte7)
@ 16,15 SAY "First byte - NOTed"
@ 16,36 SAY FT_BYT2BIT(cByte7)
@ 16,49 SAY FT_BYT2HEX(cByte7)
@ 16,55 SAY STR(ASC(cByte7),3)
@ 16,63 SAY cByte7
cByte8 := FT_BYTENEG(cByte8)
@ 18,15 SAY "First byte - NEGed"
@ 18,36 SAY FT_BYT2BIT(cByte8)
@ 18,49 SAY FT_BYT2HEX(cByte8)
@ 18,55 SAY STR(ASC(cByte8),3)
@ 18,63 SAY cByte8
END // nSlct 49 or 50?
@ 21,10 SAY "Press a Key to Continue"
INKEY(0)
END // End OPERATIONS LOOP
END // End MAIN LOOP
SETCOLOR("w/n")
CLEAR
RETURN ( NIL )
#endif
