/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* © Portions copyright (c) 2005 - 2006 Nokia Corporation. All rights reserved.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)freopen.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
#ifndef __SYMBIAN32__
__FBSDID("$FreeBSD: src/lib/libc/stdio/freopen.c,v 1.13 2004/05/22 15:19:41 tjr Exp $");
#endif
#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <wchar.h>
#ifndef DEFFILEMODE
#define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "un-namespace.h"
#include <fcntl.h>
#include <unistd.h>
#include "libc_private.h"
#include "local.h"
#include "common_def.h"
#if (defined(__SYMBIAN32__) && (defined(__WINSCW__) || defined(__WINS__)))
#include "libc_wsd_defs.h"
#endif
#ifdef EMULATOR
int *GET_WSD_VAR_NAME(__sdidinit, g)();
#define __sdidinit (*GET_WSD_VAR_NAME(__sdidinit, g)())
#endif //EMULATOR
/*
Re-direct an existing, open (probably) file to some other file.
ANSI is written such that the original file gets closed if at
all possible, no matter what.
*/
EXPORT_C FILE * wfreopen(const wchar_t * file, const wchar_t * mode, FILE *fp)
{
int f;
int dflags, flags, isopen, oflags, sverrno, wantfd;
char destmode[4];
size_t siz;
destmode[0] = '\0';
if(mode==NULL)
{
errno = EINVAL;
(void) fclose(fp);
return (NULL);
}
siz = wcstombs(destmode, mode, 4);
if ((flags = __sflags(destmode, &oflags)) == 0) {
(void) fclose(fp);
return (NULL);
}
FLOCKFILE(fp);
if (!__sdidinit)
__sinit();
/*
* If the filename is a NULL pointer, the caller is asking us to
* re-open the same file with a different mode. We allow this only
* if the modes are compatible.
*/
if (file == NULL) {
/* See comment below regarding freopen() of closed files. */
if (fp->_flags == 0) {
FUNLOCKFILE(fp);
errno = EINVAL;
return (NULL);
}
if ((dflags = _fcntl(fp->_file, F_GETFL)) < 0) {
sverrno = errno;
fclose(fp);
FUNLOCKFILE(fp);
errno = sverrno;
return (NULL);
}
if ((dflags & O_ACCMODE) != O_RDWR && (dflags & O_ACCMODE) !=
(oflags & O_ACCMODE)) {
fclose(fp);
FUNLOCKFILE(fp);
errno = EINVAL;
return (NULL);
}
if ((oflags ^ dflags) & O_APPEND) {
dflags &= ~O_APPEND;
dflags |= oflags & O_APPEND;
if (_fcntl(fp->_file, F_SETFL, dflags) < 0) {
sverrno = errno;
fclose(fp);
FUNLOCKFILE(fp);
errno = sverrno;
return (NULL);
}
}
if (oflags & O_TRUNC)
ftruncate(fp->_file, 0);
if (_fseeko(fp, 0, oflags & O_APPEND ? SEEK_END : SEEK_SET,
0) < 0 && errno != ESPIPE) {
sverrno = errno;
fclose(fp);
FUNLOCKFILE(fp);
errno = sverrno;
return (NULL);
}
f = fp->_file;
isopen = 0;
wantfd = -1;
}
else
{
/*
* There are actually programs that depend on being able to "freopen"
* descriptors that weren't originally open. Keep this from breaking.
* Remember whether the stream was open to begin with, and which file
* descriptor (if any) was associated with it. If it was attached to
* a descriptor, defer closing it; freopen("/dev/stdin", "r", stdin)
* should work. This is unnecessary if it was not a Unix file.
*/
if (fp->_flags == 0) {
fp->_flags = __SEOF; /* hold on to it */
isopen = 0;
wantfd = -1;
}
else {
/* flush the stream; ANSI doesn't require this. */
if (fp->_flags & __SWR)
(void) __sflush(fp);
/* if close is NULL, closing is a no-op, hence pointless */
isopen = fp->_close != NULL;
if ((wantfd = fp->_file) < 0 && isopen) {
(void) (*fp->_close)(fp->_cookie);
isopen = 0;
}
}
/* Get a new descriptor to refer to the new file. */
f = wopen(file, oflags, DEFFILEMODE);
if (f < 0 && isopen) {
/* If out of fd's close the old one and try again. */
if (errno == ENFILE || errno == EMFILE) {
(void) (*fp->_close)(fp->_cookie);
isopen = 0;
f = wopen(file, oflags, DEFFILEMODE);
}
}
sverrno = errno;
}
/*
* Finish closing fp. Even if the open succeeded above, we cannot
* keep fp->_base: it may be the wrong size. This loses the effect
* of any setbuffer calls, but stdio has always done this before.
*/
if (isopen)
(void) (*fp->_close)(fp->_cookie);
if (fp->_flags & __SMBF)
{
#ifdef __SYMBIAN32__
BackendFree((char *)fp->_bf._base);
#else
free((char *)fp->_bf._base);
#endif//__SYMBIAN32__
}
fp->_w = 0;
fp->_r = 0;
fp->_p = NULL;
fp->_bf._base = NULL;
fp->_bf._size = 0;
fp->_lbfsize = 0;
if (HASUB(fp))
FREEUB(fp);
fp->_ub._size = 0;
if (HASLB(fp))
FREELB(fp);
fp->_lb._size = 0;
fp->_extra->orientation = 0;
memset(&fp->_extra->mbstate, 0, sizeof(mbstate_t));
if (f < 0) { /* did not get it after all */
fp->_flags = 0; /* set it free */
errno = sverrno; /* restore in case _close clobbered */
FUNLOCKFILE(fp);
return (NULL);
}
#ifndef __SYMBIAN32__
/*
* If reopening something that was open before on a real file, try
* to maintain the descriptor. Various C library routines (perror)
* assume stderr is always fd STDERR_FILENO, even if being freopen'd.
*/
if (wantfd >= 0 && f != wantfd) {
if (dup2(f, wantfd) >= 0) {
(void)_close(f);
f = wantfd;
}
}
#else
if (wantfd >= 0 && f > wantfd){
if (dup2(f, wantfd) >= 0) {
(void)_close(f);
f = wantfd;
}
}
#endif
fp->_flags = flags;
fp->_file = f;
fp->_cookie = fp;
fp->_read = __sread;
fp->_write = __swrite;
fp->_seek = __sseek;
fp->_close = __sclose;
#ifdef __SYMBIAN32__
if (oflags & O_TEXT) {
fp->_extra->fmode = 't';
}
else {
fp->_extra->fmode = 'b';
}
#endif
FUNLOCKFILE(fp);
return (fp);
}