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/* Open a stream to a file.
Copyright (C) 2007-2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
/* If the user's config.h happens to include <stdio.h>, let it include only
the system's <stdio.h> here, so that orig_freopen doesn't recurse to
rpl_freopen. */
#define __need_FILE
#include <config.h>
/* Get the original definition of freopen. It might be defined as a macro. */
#include <stdio.h>
#undef __need_FILE
#include <errno.h>
static FILE *
orig_freopen (const char *filename, const char *mode, FILE *stream)
{
return freopen (filename, mode, stream);
}
/* Specification. */
/* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates
this include because of the preliminary #include <stdio.h> above. */
#include "stdio.h"
#include <string.h>
FILE *
rpl_freopen (const char *filename, const char *mode, FILE *stream)
{
FILE *result;
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
if (filename != NULL && strcmp (filename, "/dev/null") == 0)
filename = "NUL";
#endif
/* Clear errno to check the success of freopen() with it */
errno = 0;
result = orig_freopen (filename, mode, stream);
#ifdef __KLIBC__
/* On OS/2 kLIBC, freopen() returns NULL even if it is successful
if filename is NULL. */
if (!filename && !result && !errno)
result = stream;
#endif
return result;
}
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