| /*- |
| * 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. |
| */ |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; |
| #endif /* LIBC_SCCS and not lint */ |
| #include <sys/cdefs.h> |
| __FBSDID("$FreeBSD$"); |
| |
| #include "namespace.h" |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <limits.h> |
| #include "un-namespace.h" |
| |
| #include "local.h" |
| |
| FILE * |
| fopen(const char * __restrict file, const char * __restrict mode) |
| { |
| FILE *fp; |
| int f; |
| int flags, oflags; |
| |
| if ((flags = __sflags(mode, &oflags)) == 0) |
| return (NULL); |
| if ((fp = __sfp()) == NULL) |
| return (NULL); |
| if ((f = _open(file, oflags, DEFFILEMODE)) < 0) { |
| fp->_flags = 0; /* release */ |
| return (NULL); |
| } |
| /* |
| * File descriptors are a full int, but _file is only a short. |
| * If we get a valid file descriptor that is greater than |
| * SHRT_MAX, then the fd will get sign-extended into an |
| * invalid file descriptor. Handle this case by failing the |
| * open. |
| */ |
| if (f > SHRT_MAX) { |
| fp->_flags = 0; /* release */ |
| _close(f); |
| errno = EMFILE; |
| return (NULL); |
| } |
| fp->_file = f; |
| fp->_flags = flags; |
| 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(fp, (fpos_t)0, SEEK_END); |
| return (fp); |
| } |