exinq.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 111 行

/****************************************************************************
*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    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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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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//
// EXINQ        : Run-time INQUIRE statement processor
//

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

extern  bool            FindFName(void);
extern  void            IOErr(int,...);
extern  bool            FindFtnFile(void);
extern  void            DfltInq(void);
extern  void            InqExList(void);
extern  void            InqOdList(void);
extern  void            DiscoFile(ftnfile *);
extern  int             IOMain(void (*)( void ));


static  void    ExInquire( void ) {
//===========================

    bool        exist;
    bool        opened;
    bool        connected;
    bool        inq_by_file;

    connected = TRUE;
    if( IOCB->set_flags & SET_FILENAME ) {
        // inquire by file name
        inq_by_file = TRUE;
        // FindFName() will set up a dummy fcb if FALSE is returned
        opened = FindFName();
        if( opened ) {
            exist = ( IOCB->fileinfo->flags & FTN_EXIST ) != 0;
        } else {
            exist = ( IOCB->fileinfo->flags & FTN_FSEXIST ) != 0;
        }
    } else {
        // inquire by unit
        inq_by_file = FALSE;
        if( IOCB->flags & BAD_UNIT ) {
            IOErr( IO_IUNIT );
        }
        FindFtnFile();
        exist = ( IOCB->unitid <= PREC_MAX_UNIT );
        opened = ( IOCB->fileinfo != NULL );
        if( !opened ) {
            connected = FALSE;
        }
    }
    DfltInq();
    if( exist && connected ) {
        InqExList();
    }
    if( opened ) {
        InqOdList();
    } else if( inq_by_file ) { // disconnect dummy fcb created by FindFName()
        DiscoFile( IOCB->fileinfo );
    }
    if( IOCB->set_flags & SET_EXSTPTR ) {
        *IOCB->exstptr = exist;
    }
    if( IOCB->set_flags & SET_OPENPTR ) {
        *IOCB->openptr = opened;
    }
    // if we got this far, no error in inquire so
    // don't let IOMain() overwrite the iostat we set
    IOCB->set_flags &= ~SET_IOSPTR;
}


int     IOInq( void ) {
//===============

    IOCB->iostmt = IO_INQ;
    return( IOMain( &ExInquire ) );
}