glibc/stdio/fclose.c

/* Copyright (C) 1991, 1995, 1996 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>


/* Close a stream.  */
int
fclose (stream)
     register FILE *stream;
{
  int status;

  if (stream == NULL)
    {
      /* Close all streams.  */
      register FILE *f;
      for (f = __stdio_head; f != NULL; f = f->__next)
	if (__validfp(f))
	  (void) fclose(f);
      return 0;
    }

  if (!__validfp(stream))
    {
      __set_errno (EINVAL);
      return EOF;
    }

  if (stream->__mode.__write &&
      /* Flush the buffer.  */
      __flshfp (stream, EOF) == EOF)
    return EOF;

  /* Free the buffer's storage.  */
  if (stream->__buffer != NULL && !stream->__userbuf)
    free(stream->__buffer);

  /* Close the system file descriptor.  */
  if (stream->__io_funcs.__close != NULL)
    status = (*stream->__io_funcs.__close)(stream->__cookie);
  else if (!stream->__seen && stream->__cookie != NULL)
    status = __stdio_close(stream->__cookie);
  else
    status = 0;

  /* Nuke the stream, making it available for re-use.  */
  __invalidate(stream);

  return status < 0 ? EOF : 0;
}