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BYT2BIT.PRG
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1991-08-16
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3KB
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85 lines
/*
* File......: BYT2BIT.PRG
* Author....: Forest Belt, Computer Diagnostic Services, Inc.
* Date......: $Date: 15 Aug 1991 23:02:58 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/byt2bit.prv $
*
* This is an original work by Forest Belt and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: E:/nanfor/src/byt2bit.prv $
*
* Rev 1.2 15 Aug 1991 23:02:58 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:51:08 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:00:48 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_BYT2BIT()
* $CATEGORY$
* Conversion
* $ONELINER$
* Convert byte to string of 1's and 0's
* $SYNTAX$
* FT_BYT2BIT( <cByte> ) -> cBitPattern
* $ARGUMENTS$
* <cByte> is the byte to convert.
* $RETURNS$
* 9-character string, consisting of 1's and 0's, representing bits 0
* through 7 of parameter byte, with space between bits 3 and 4. Returns
* NIL if parameters are faulty.
* $DESCRIPTION$
* Can be used to show results of bit manipulation, both before and after.
* Binary representation follows right-to-left convention of bit position
* numbering, 0 through 7. Space between high and low nibbles for clarity
* and easy comparison to hexadecimal notation.
*
* This function is presented to illustrate that bit-wise operations
* are possible with Clipper code. For greater speed, write .C or
* .ASM versions and use the Clipper Extend system.
* $EXAMPLES$
* These three code lines perform a bitwise AND on bytes with values of
* CHR(20) and CHR(36), and deliver the result as a string in binary (bit)
* format.
*
* ? FT_BYT2BIT(CHR(20)) // byte1: '0001 0100'
* ? FT_BYT2BIT(CHR(36)) // byte2: '0010 0100'
*
* ? FT_BYT2BIT(FT_BYTEAND(CHR(20), CHR(36)))
* // result: '0000 0100'
*
* For a demonstration of Clipper bit manipulations, compile and
* link the program BITTEST.PRG in the Nanforum Toolkit source code.
* $SEEALSO$
* FT_BYT2HEX()
* $END$
*/
FUNCTION FT_BYT2BIT(cByte)
local nCounter, xBitstring
IF valtype(cByte) != "C"
xBitString := NIL
ELSE
xBitString := ""
FOR nCounter := 7 TO 0 step -1
xBitString += iif(FT_ISBIT(cByte, nCounter), "1", "0")
NEXT
ENDIF
RETURN xBitString