77 lines
2.2 KiB
Plaintext
77 lines
2.2 KiB
Plaintext
/*
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* File......: BYT2HEX.PRG
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* Author....: Forest Belt, Computer Diagnostic Services, Inc.
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* CIS ID....: ?
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*
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* This is an original work by Forest Belt and is placed in the
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* public domain.
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*
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* Modification history:
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* ---------------------
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*
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* Rev 1.2 15 Aug 1991 23:03:00 GLENN
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* Forest Belt proofread/edited/cleaned up doc
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*
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* Rev 1.1 14 Jun 1991 19:51:10 GLENN
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* Minor edit to file header
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*
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* Rev 1.0 01 Apr 1991 01:00:48 GLENN
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* Nanforum Toolkit
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*
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*/
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/* $DOC$
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* $FUNCNAME$
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* FT_BYT2HEX()
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* $CATEGORY$
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* Conversion
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* $ONELINER$
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* Convert byte to hexadecimal version of its binary value
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* $SYNTAX$
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* FT_BYT2HEX( cByte ) -> cHexValue
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* $ARGUMENTS$
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* <cByte> is the byte to convert.
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* $RETURNS$
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* Three-character string, consisting of two digits of hexadecimal
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* notation and letter 'h' to signify hex. Returns NIL if parameters are
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* faulty.
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* $DESCRIPTION$
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* Can be used to show results of bit manipulation, both before and after.
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*
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* This function is presented to illustrate that bit-wise operations
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* are possible with Clipper code. For greater speed, write .C or
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* .ASM versions and use the Clipper Extend system.
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* $EXAMPLES$
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* These three code lines perform a bitwise AND on bytes with values of
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* CHR(20) and CHR(36), and deliver the result as a string in hexadecimal
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* format, using 'h' to signify hexadecimal.
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*
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* ? FT_BYT2HEX(CHR(20)) // byte1: '14h'
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* ? FT_BYT2HEX(CHR(36)) // byte2: '24h'
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*
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* ? FT_BYT2HEX(FT_BYTEAND(CHR(20), CHR(36)))
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* // result: '04h'
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*
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* For a demonstration of Clipper bit manipulations, compile and
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* link the program BITTEST.PRG in the Nanforum Toolkit source code.
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* $SEEALSO$
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* FT_BYT2BIT()
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* $END$
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*/
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FUNCTION FT_BYT2HEX(cByte)
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local cHexTable := "0123456789ABCDEF"
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local xHexString
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if valtype(cByte) != "C"
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xHexString := NIL
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else
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xHexString := substr(cHexTable, int(asc(cByte) / 16) + 1, 1) ;
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+ substr(cHexTable, int(asc(cByte) % 16) + 1, 1) ;
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+ "h"
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endif
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RETURN xHexString
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