| /* Copyright (C) 1991, 1994, 1995, 1996, 1997 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 <errno.h> |
| #include <stdio.h> |
| |
| |
| /* Defined in fopen.c. */ |
| extern int __getmode __P ((const char *, __io_mode *)); |
| |
| /* Defined in sysd-stdio.c. */ |
| extern int __stdio_reopen __P ((const char *filename, __io_mode mode, |
| void *cookieptr, __io_close_fn closefn)); |
| |
| /* Replace STREAM, opening it on FILENAME. */ |
| FILE * |
| freopen (filename, mode, stream) |
| const char *filename; |
| const char *mode; |
| register FILE *stream; |
| { |
| __io_mode m; |
| void *cookie; |
| |
| if (!__getmode (mode, &m)) |
| { |
| (void) fclose (stream); |
| __set_errno (EINVAL); |
| return NULL; |
| } |
| |
| if (stream->__mode.__write) |
| /* Flush the stream. */ |
| (void) fflush (stream); |
| |
| /* Open the file, attempting to preserve the old cookie value. */ |
| cookie = stream->__cookie; |
| if (__stdio_reopen (filename, m, &cookie, |
| stream->__seen ? |
| stream->__io_funcs.__close : |
| __stdio_close)) |
| { |
| int save = errno; |
| (void) fclose (stream); |
| __set_errno (save); |
| return NULL; |
| } |
| |
| /* Close the stream, first disabling its cookie close function because |
| __stdio_reopen has already dealt with closing the old cookie. */ |
| stream->__seen = 1; /* It might have no functions yet. */ |
| stream->__io_funcs.__close = NULL; |
| (void) fclose (stream); |
| |
| stream->__magic = _IOMAGIC; |
| stream->__cookie = cookie; |
| stream->__mode = m; |
| |
| return stream; |
| } |