biosprin.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 69 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#include <bios.h>
#include "necibm.h"
#include "nonibm.h"


_WCRTLINK unsigned short _bios_printer( unsigned ibmCmd, unsigned port, unsigned data )
{
    unsigned            necCmd;
    unsigned short      necRc, ret;

    if( !__NonIBM ) {
        return( __ibm_bios_printer( ibmCmd, port, data ) );
    } else {
        /*** Translate IBM commands to NEC98 commands ***/
        switch( ibmCmd ) {
          case _IBM_PRINTER_WRITE:
            necCmd = _NEC98_PRINTER_WRITE;
            break;
          case _IBM_PRINTER_INIT:
            necCmd = _NEC98_PRINTER_INIT;
            break;
          case _IBM_PRINTER_STATUS:
            necCmd = _NEC98_PRINTER_STATUS;
            break;
          default:
            return( 0 );        // invalid command for NEC 98
        }

        ret = 0;
        necRc = __nec98_bios_printer( necCmd, (unsigned char*)&data );
        if( necRc & 0x0001 )  ret |= 0x0008;    // I/O error
        if( necRc & 0x0002 )  ret |= 0x0001;    // timeout bit
        return( ret );
    }
}