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POKE.C
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1991-08-16
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/*
* File......: POKE.C
* Author....: Ted Means
* Date......: $Date: 15 Aug 1991 23:08:20 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/poke.c_v $
*
* This is an original work by Ted Means and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: E:/nanfor/src/poke.c_v $
*
* Rev 1.2 15 Aug 1991 23:08:20 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:53:48 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:02:54 GLENN
* Nanforum Toolkit
*
*
*/
/* $DOC$
* $FUNCNAME$
* FT_POKE()
* $CATEGORY$
* DOS/BIOS
* $ONELINER$
* Write a byte to a specified memory location
* $SYNTAX$
* FT_POKE( <nSegment>, <nOffset>, <nValue> ) -> lResult
* $ARGUMENTS$
* <nSegment> is the segment of the desired memory address.
*
* <nOffset> is the offset of the desired memory address.
*
* <nValue> is the value to write to the desired memory address.
* $RETURNS$
* <lResult> will be .T. if all parameters were valid and the function was
* able to write the desired byte.
* <lResult> will be .F. if invalid parameters were passed.
* $DESCRIPTION$
* Use this function if you have a need to change the value at a specific
* memory location. The function will write the specified byte to the
* specified address. The value must be passed as a numeric; if the byte
* you wish to use is stored as a character, use the Asc() function
* to convert it.
*
* This function was written for version 5.1 of MicroSoft C. You may
* have to modify the source code to use another compiler.
* $EXAMPLES$
* FT_POKE( 0, 1047, 64) // Turn CapsLock on
* $END$
*/
#include <extend.h>
CLIPPER FT_POKE(void)
{
auto unsigned char * byteptr;
if ( (PCOUNT >= 3) && (ISNUM(1)) && (ISNUM(2)) && (ISNUM(3)) )
{
* ((unsigned int *) &byteptr) = _parni(2);
* ((unsigned int *) &byteptr + 1) = _parni(1);
*byteptr = ((unsigned char) _parni(3));
_retl( TRUE );
}
else
_retl( FALSE );
return;
}