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/*

FUNCTION

<<fclose>>---close a file

INDEX

        fclose

ANSI_SYNOPSIS

        #include <stdio.h>

        int fclose(FILE *<[fp]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int fclose(<[fp]>)

        FILE *<[fp]>;

DESCRIPTION

If the file or stream identified by <[fp]> is open, <<fclose>> closes

it, after first ensuring that any pending data is written (by calling

<<fflush(<[fp]>)>>).

RETURNS

<<fclose>> returns <<0>> if successful (including when <[fp]> is

<<NULL>> or not an open file); otherwise, it returns <<EOF>>.

PORTABILITY

<<fclose>> is required by ANSI C.

Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,

<<read>>, <<sbrk>>, <<write>>.

*/

/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

#include <stdio.h>

#include <stdlib.h>

#include "local.h"

/*

 * Close a file.

 */

int

_DEFUN (fclose, (fp),

        register FILE * fp)

{

  int r;

  if (fp == NULL)

    return (0);                  /* on NULL */

  CHECK_INIT (fp);

  if (fp->_flags == 0)           /* not open! */

    return (0);

  r = fp->_flags & __SWR ? fflush (fp) : 0;

  if (fp->_close != NULL && (*fp->_close) (fp->_cookie) < 0)

    r = EOF;

  if (fp->_flags & __SMBF)

    _free_r (fp->_data, (char *) fp->_bf._base);

  if (HASUB (fp))

    FREEUB (fp);

  if (HASLB (fp))

    FREELB (fp);

  fp->_flags = 0;                /* release this FILE for reuse */

  return (r);

}