readch.i

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· I 代码 · 共 38 行

(*#@(#)readch.i	4.1	Ultrix	7/17/90 *)
(****************************************************************************
 *									    *
 *  Copyright (c) 1984 by						    *
 *  DIGITAL EQUIPMENT CORPORATION, Maynard, Massachusetts.		    *
 *  All rights reserved.						    *
 * 									    *
 *  This software is furnished under a license and may be used and copied   *
 *  only in  accordance with  the  terms  of  such  license  and with the   *
 *  inclusion of the above copyright notice. This software or  any  other   *
 *  copies thereof may not be provided or otherwise made available to any   *
 *  other person.  No title to and ownership of  the  software is  hereby   *
 *  transferred.							    *
 * 									    *
 *  The information in this software is  subject to change without notice   *
 *  and  should  not  be  construed as  a commitment by DIGITAL EQUIPMENT   *
 *  CORPORATION.							    *
 * 									    *
 *  DIGITAL assumes no responsibility for the use  or  reliability of its   *
 *  software on equipment which is not supplied by DIGITAL.		    *
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 ****************************************************************************)

{ To improve I/O performance, this file is included multiple times, avoiding }
{  the procedure call to get the next character.  The most common path does }
{  a test, increments the pointer, and gets a character from the buffer }

{ if buffer is empty, refill it }
if chptr >= numchread then begin
    RefillBuffer;
end;

{ buffer is sure to be full at this point }
chptr := chptr + 1;
{ get the next character from the buffer }
nextchar := buff[chptr];