$include (..\lib\compStch.ext)

/*
 *============================================================================
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
 *
 *  Permission to use for any purpose, modify, copy, and make enhancements
 *  and derivative works of the software is granted if attribution is given to
 *  R.M. Gillmore, dba the ACME Software Deli, as the author
 *
 *  While the ACME Software Deli does not work for money, there is nonetheless
 *  a significant amount of work involved.  The ACME Software Deli maintains the
 *  rights to all code written, though it may be used and distributed as long as
 *  the following conditions are maintained.
 *
 *  1.  The copyright statement at the top of each code block is maintained in
 *      your distribution.
 *  2.  You do not identify yourself as the ACME Software Deli
 *  3.  Any changes made to the software are sent to the ACME Software Deli
 *============================================================================
 */


freadModule:
do;
$if not noID
declare IDString	(*) byte data
	( '@(#)fread.p86     $Author: rmgillmore $ $Date:: 2025-05-04 19:35:39#$:', 0 );
$endif

$set( freadSource )
$include (..\lib\fileIO.ext)
$include (..\lib\sysCalls.ext)
$include (..\lib\string.ext)

fread:
procedure ( fileHandle, byteArray, byteArrayLength ) word reentrant public;
	declare fileHandle				word,
			byteArray				pointer,
			byteArrayLength			word;
	declare numberRead				word,
			cpuRegisters;

	byteRegs.Ah = 03fh;
	wordRegs.Bx = fileHandle;
	wordRegs.Cx = byteArrayLength;
	wordRegs.Dx = offset$of( byteArray );
	wordRegs.Ds = selector$of( byteArray );
	call int86( DOS_CALL, @wordRegs );

	if ( carryClear( @wordRegs ) ) then
	do;
		numberRead = wordRegs.Ax;
		errno = 0;
	end;
	else
	do;
		numberRead = -1;
		errno = wordRegs.Ax;
	end;

	return ( numberRead );
end fread;

end freadModule;