diff options
Diffstat (limited to 'libc/stdio/freopen.c')
| -rw-r--r-- | libc/stdio/freopen.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/libc/stdio/freopen.c b/libc/stdio/freopen.c deleted file mode 100644 index 414d810..0000000 --- a/libc/stdio/freopen.c +++ /dev/null @@ -1,158 +0,0 @@ -/* $OpenBSD: freopen.c,v 1.9 2005/08/08 08:05:36 espie Exp $ */ -/*- - * 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. 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(const char *file, const char *mode, FILE *fp) -{ - 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 && f != wantfd) - (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); - _UB(fp)._size = 0; - WCIO_FREE(fp); - 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; - - /* - * When opening in append mode, even though we use O_APPEND, - * we need to seek to the end so that ftell() gets the right - * answer. If the user then alters the seek pointer, or - * the file extends, this will fail, but there is not much - * we can do about this. (We could set __SAPP and check in - * fseek and ftell.) - */ - if (oflags & O_APPEND) - (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); - return (fp); -} |