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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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/* Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <stdio.h>
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/* Defined in fopen.c. */
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extern int __getmode __P ((const char *, __io_mode *));
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/* Defined in sysd-stdio.c. */
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extern int __stdio_reopen __P ((const char *filename, __io_mode mode,
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PTR *cookieptr, __io_close_fn closefn));
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/* Replace STREAM, opening it on FILENAME. */
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FILE *
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DEFUN(freopen, (filename, mode, stream),
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CONST char *filename AND CONST char *mode AND register FILE *stream)
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{
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__io_mode m;
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PTR cookie;
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if (!__getmode (mode, &m))
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{
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(void) fclose (stream);
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errno = EINVAL;
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return NULL;
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}
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if (stream->__mode.__write)
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/* Flush the stream. */
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(void) fflush (stream);
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/* Open the file, attempting to preserve the old cookie value. */
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cookie = stream->__cookie;
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if (__stdio_reopen (filename, m, &cookie,
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stream->__seen ?
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stream->__io_funcs.__close :
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__stdio_close))
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{
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int save = errno;
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(void) fclose (stream);
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errno = save;
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return NULL;
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}
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/* Close the stream, first disabling its cookie close function because
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__stdio_reopen has already dealt with closing the old cookie. */
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stream->__seen = 1; /* It might have no functions yet. */
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stream->__io_funcs.__close = NULL;
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(void) fclose (stream);
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stream->__magic = _IOMAGIC;
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stream->__cookie = cookie;
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stream->__mode = m;
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return stream;
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}
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