exread.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 88 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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*    available at www.sybase.com/developer/opensource.
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


//
// EXREAD       : Run-time READ statement processor
//

#include "ftnstd.h"
#include "rundat.h"
#include "rtenv.h"
#include "units.h"

extern  void            IOPrologue(void);
extern  void            UnFmtIn(void);
extern  void            FreeIn(void);
extern  void            R_FExec(void);
extern  void            DiscoFile(ftnfile *);
extern  int             IOMain(void (*)( void ));
extern  void            SkipLogicalRecord(ftnfile *);

extern  void            (*FmtRoutine)( void );


static  void    ExRead( void ) {
//========================

    IOCB->flags &= ~IOF_OUTPT;
    IOPrologue();
    if( IOCB->flags & IOF_NOFMT ) {
        UnFmtIn();
    } else {
        if( IOCB->set_flags & SET_FMTPTR ) {
            FmtRoutine();
        } else {
            FreeIn();
        }
    }
    if( IOCB->set_flags & SET_INTERNAL ) {
        DiscoFile( IOCB->fileinfo );
    } else {
        IOCB->fileinfo->flags &= ~FTN_LOGICAL_RECORD;
        if( _LogicalRecordOrganization( IOCB->fileinfo ) ) {
            SkipLogicalRecord( IOCB->fileinfo );
        }
    }
}


int     DoRead( void ) {
//================

    IOCB->iostmt = IO_READ;
    if( ( IOCB->set_flags & SET_UNIT ) == 0 ) {
        IOCB->unitid = STANDARD_INPUT;
        IOCB->set_flags |= SET_UNIT;
    }
    return( IOMain( &ExRead ) );
}