+++ /dev/null
-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 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.
- */
-
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "local.h"
-
-/*
- * 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.
- */
-FILE *
-freopen(file, mode, fp)
- const char *file, *mode;
- register FILE *fp;
-{
- register int f;
- int flags, isopen, oflags, sverrno, wantfd;
-
- if ((flags = __sflags(mode, &oflags)) == 0) {
- (void) fclose(fp);
- return (NULL);
- }
-
- if (!__sdidinit)
- __sinit();
-
- /*
- * 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 = open(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 = open(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)
- free((char *)fp->_bf._base);
- 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;
-
- if (f < 0) { /* did not get it after all */
- fp->_flags = 0; /* set it free */
- errno = sverrno; /* restore in case _close clobbered */
- return (NULL);
- }
-
- /*
- * 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;
- }
- }
-
- fp->_flags = flags;
- fp->_file = f;
- fp->_cookie = fp;
- fp->_read = __sread;
- fp->_write = __swrite;
- fp->_seek = __sseek;
- fp->_close = __sclose;
- return (fp);
-}
projects / apple / libc.git / blobdiff