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/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
*
* GNU Library General Public License (LGPL) version 2 or later.
*
* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
*/
#include "_stdio.h"
#ifdef __DO_LARGEFILE
# ifndef __UCLIBC_HAS_LFS__
# error large file support is not enabled!
# endif
# define freopen freopen64
# define FILEDES_ARG (-2)
#else
# define FILEDES_ARG (-1)
#endif
FILE *freopen(const char * __restrict filename, const char * __restrict mode,
register FILE * __restrict stream)
{
/*
* ANSI/ISO allow (implementation-defined) change of mode for an
* existing file if filename is NULL. It doesn't look like Linux
* supports this, so we don't here.
*
* NOTE: Whether or not the stream is free'd on failure is unclear
* w.r.t. ANSI/ISO. This implementation chooses to NOT free
* the stream and associated buffer if they were dynamically
* allocated.
* NOTE: Previous versions of uClibc did free dynamic storage.
*
* TODO: Apparently linux allows setting append mode. Implement?
*/
unsigned short dynmode;
register FILE *fp;
__STDIO_AUTO_THREADLOCK_VAR;
__STDIO_AUTO_THREADLOCK(stream);
__STDIO_STREAM_VALIDATE(stream);
/* First, flush and close, but don't deallocate, the stream. */
/* This also removes the stream for the open file list. */
dynmode = (stream->__modeflags & (__FLAG_FREEBUF|__FLAG_FREEFILE));
stream->__modeflags &= ~(__FLAG_FREEBUF|__FLAG_FREEFILE);
/* Only call fclose on the stream if it is not already closed. */
if ((stream->__modeflags & (__FLAG_READONLY|__FLAG_WRITEONLY))
!= (__FLAG_READONLY|__FLAG_WRITEONLY)
) {
fclose(stream); /* Failures are ignored. */
}
fp = _stdio_fopen(((intptr_t) filename), mode, stream, FILEDES_ARG);
/* Reset the allocation flags. */
stream->__modeflags |= dynmode;
__STDIO_AUTO_THREADUNLOCK(stream);
return fp;
}
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