| 1 | /*-␊ |
| 2 | * Copyright (c) 1990, 1993␊ |
| 3 | *␉The Regents of the University of California. All rights reserved.␊ |
| 4 | *␊ |
| 5 | * This code is derived from software contributed to Berkeley by␊ |
| 6 | * Chris Torek.␊ |
| 7 | *␊ |
| 8 | * Redistribution and use in source and binary forms, with or without␊ |
| 9 | * modification, are permitted provided that the following conditions␊ |
| 10 | * are met:␊ |
| 11 | * 1. Redistributions of source code must retain the above copyright␊ |
| 12 | * notice, this list of conditions and the following disclaimer.␊ |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 14 | * notice, this list of conditions and the following disclaimer in the␊ |
| 15 | * documentation and/or other materials provided with the distribution.␊ |
| 16 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 17 | * may be used to endorse or promote products derived from this software␊ |
| 18 | * without specific prior written permission.␊ |
| 19 | *␊ |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 30 | * SUCH DAMAGE.␊ |
| 31 | */␊ |
| 32 | ␊ |
| 33 | #ifdef VARIANT_DARWINEXTSN␊ |
| 34 | #define _DARWIN_UNLIMITED_STREAMS␊ |
| 35 | #define COUNT␉0␊ |
| 36 | #elif defined(VARIANT_LEGACY)␊ |
| 37 | #define COUNT␉0␊ |
| 38 | #else␊ |
| 39 | #define COUNT␉1␊ |
| 40 | #endif␊ |
| 41 | ␊ |
| 42 | #if defined(LIBC_SCCS) && !defined(lint)␊ |
| 43 | static char sccsid[] = "@(#)fopen.c␉8.1 (Berkeley) 6/4/93";␊ |
| 44 | #endif /* LIBC_SCCS and not lint */␊ |
| 45 | #include <sys/cdefs.h>␊ |
| 46 | //__FBSDID("$FreeBSD: src/lib/libc/stdio/fopen.c,v 1.14 2008/04/22 17:03:32 jhb Exp $");␊ |
| 47 | ␊ |
| 48 | #include "namespace.h"␊ |
| 49 | #include <sys/types.h>␊ |
| 50 | #include <limits.h>␊ |
| 51 | #include "stdio.h"␊ |
| 52 | #include "errno.h"␊ |
| 53 | #include "un-namespace.h"␊ |
| 54 | #include "fcntl.h"␊ |
| 55 | ␊ |
| 56 | #include "local.h"␊ |
| 57 | ␊ |
| 58 | FILE *␊ |
| 59 | fopen(file, mode)␊ |
| 60 | ␉const char * __restrict file;␊ |
| 61 | ␉const char * __restrict mode;␊ |
| 62 | {␊ |
| 63 | ␉FILE *fp;␊ |
| 64 | ␉int f;␊ |
| 65 | ␉int flags, oflags;␊ |
| 66 | ␊ |
| 67 | if ((flags = __sflags(mode, &oflags)) == 0)␊ |
| 68 | ␉␉return (NULL);␉␊ |
| 69 | ␉if ((fp = __sfp(COUNT)) == NULL)␊ |
| 70 | ␉␉return (NULL);␊ |
| 71 | ␉if ((f = open(file) < 0)) {␊ |
| 72 | ␉␉__sfprelease(fp);␉␉/* release */␊ |
| 73 | ␉␉return (NULL);␊ |
| 74 | ␉}␊ |
| 75 | ␉/*␊ |
| 76 | ␉ * File descriptors are a full int, but _file is only a short.␊ |
| 77 | ␉ * If we get a valid file descriptor that is greater than␊ |
| 78 | ␉ * SHRT_MAX, then the fd will get sign-extended into an␊ |
| 79 | ␉ * invalid file descriptor. Handle this case by failing the␊ |
| 80 | ␉ * open.␊ |
| 81 | ␉ */␊ |
| 82 | ␉if (f > SHRT_MAX) {␊ |
| 83 | ␉␉fp->_flags = 0;␉␉␉/* release */␊ |
| 84 | ␉␉close(f);␊ |
| 85 | set_errno(EMFILE);␊ |
| 86 | ␉␉return (NULL);␊ |
| 87 | ␉}␊ |
| 88 | ␉fp->_file = f;␊ |
| 89 | ␉fp->_flags = flags;␊ |
| 90 | ␉fp->_cookie = fp;␊ |
| 91 | ␉fp->_read = __sread;␊ |
| 92 | ␉fp->_write = __swrite;␊ |
| 93 | ␉fp->_seek = __sseek;␊ |
| 94 | ␉fp->_close = __sclose;␊ |
| 95 | ␉/*␊ |
| 96 | ␉ * When opening in append mode, even though we use O_APPEND,␊ |
| 97 | ␉ * we need to seek to the end so that ftell() gets the right␊ |
| 98 | ␉ * answer. If the user then alters the seek pointer, or␊ |
| 99 | ␉ * the file extends, this will fail, but there is not much␊ |
| 100 | ␉ * we can do about this. (We could set __SAPP and check in␊ |
| 101 | ␉ * fseek and ftell.)␊ |
| 102 | ␉ */␊ |
| 103 | ␉if (oflags & O_APPEND)␊ |
| 104 | ␉␉(void)_sseek(fp, (fpos_t)0, SEEK_END);␊ |
| 105 | ␉return (fp);␊ |
| 106 | }␊ |
| 107 | |
