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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"
#ifndef __DO_LARGEFILE
# 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);
__STDIO_OPENLIST_INC_USE; /* Do not remove the file from the list. */
/* 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. */
/* NOTE: fclose always does __STDIO_OPENLIST_INC_DEL_CNT. But we don't
* want to remove this FILE from the open list, even if the freopen fails.
* Consider the case of a failed freopen() on stdin. You probably still
* want to be able to call freopen() again. Similarly for other "malloc'd"
* streams. */
__STDIO_OPENLIST_DEC_DEL_CNT;
}
fp = _stdio_fopen(((intptr_t) filename), mode, stream, FILEDES_ARG);
if (!fp) {
/* Don't remove stream from the open file list and (potentially) free it.
* See _stdio_openlist_dec_use() in fflush.c. */
stream->__modeflags = __FLAG_READONLY|__FLAG_WRITEONLY|__FLAG_FAILED_FREOPEN;
}
/* Reset the allocation flags. */
stream->__modeflags |= dynmode;
__STDIO_OPENLIST_DEC_USE;
__STDIO_AUTO_THREADUNLOCK(stream);
return fp;
}
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