fclose.c

C语言库函数的原型,有用的拿去

/***
*fclose.c - close a file
*
*       Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines fclose() - close an open file
*
*******************************************************************************/

#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <string.h>
#include <io.h>
#include <stdlib.h>
#include <internal.h>
#include <mtdll.h>
#include <dbgint.h>


/***
*int fclose(stream) - close a stream
*
*Purpose:
*       Flushes and closes a stream and frees any buffer associated
*       with that stream, unless it was set with setbuf.
*
*Entry:
*       FILE *stream - stream to close
*
*Exit:
*       returns 0 if OK, EOF if fails (can't _flush, not a FILE, not open, etc.)
*       closes the file -- affecting FILE structure
*
*Exceptions:
*
*******************************************************************************/

int __cdecl fclose (
        FILE *stream
        )
{
    int result = EOF;

    _VALIDATE_RETURN((stream != NULL), EINVAL, EOF);

    /* If stream is a string, simply clear flag and return EOF */
    if (stream->_flag & _IOSTRG)
        stream->_flag = 0;  /* IS THIS REALLY NEEDED ??? */

    /* Stream is a real file. */
    else {
        _lock_str(stream);
        __try {
            result = _fclose_nolock(stream);
        }
        __finally {
            _unlock_str(stream);
        }
    }

    return(result);
}

/***
*int _fclose_nolock() - close a stream (lock already held)
*
*Purpose:
*       Core fclose() routine; assumes caller has stream lock held.
*
*       [See fclose() above for more information.]
*
*Entry:
*
*Exit:
*
*Exceptions:
*
*******************************************************************************/

int __cdecl _fclose_nolock (
        FILE *str
        )
{
        REG1 FILE *stream;
        REG2 int result = EOF;

        _VALIDATE_RETURN((str != NULL), EINVAL, EOF);

        /* Init near stream pointer */
        stream = str;

        if (inuse(stream)) {

                /* Stream is in use:
                       (1) flush stream
                       (2) free the buffer
                       (3) close the file
                       (4) delete the file if temporary
                */

                result = _flush(stream);
                _freebuf(stream);

                if (_close(_fileno(stream)) < 0)
                        result = EOF;

                else if ( stream->_tmpfname != NULL ) {
                        /*
                         * temporary file (i.e., one created by tmpfile()
                         * call). delete, if necessary (don't have to on
                         * Windows NT because it was done by the system when
                         * the handle was closed). also, free up the heap
                         * block holding the pathname.
                         */

                        _free_crt(stream->_tmpfname);
                stream->_tmpfname = NULL;
                }

        }

        stream->_flag = 0;
        return(result);
}