52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* Copyright (C) 1991 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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/* 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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FILE *head;
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if (!__validfp(stream))
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{
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errno = EINVAL;
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return NULL;
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}
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/* Return value explicitly ignored. */
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(void) fclose(stream);
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/* Make sure STREAM will be the first one checked. */
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head = __stdio_head;
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__stdio_head = stream;
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/* This will return either STREAM or NULL. */
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stream = fopen(filename, mode);
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/* Restore the saved value. */
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__stdio_head = head;
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return stream;
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}
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