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 <sys/stat.h>␊ |
51 | #include <fcntl.h>␊ |
52 | #include <unistd.h>␊ |
53 | #include <stdio.h>␊ |
54 | #include <errno.h>␊ |
55 | #include <limits.h>␊ |
56 | #include "un-namespace.h"␊ |
57 | ␊ |
58 | #include "local.h"␊ |
59 | ␊ |
60 | FILE *␊ |
61 | fopen(file, mode)␊ |
62 | const char * __restrict file;␊ |
63 | const char * __restrict mode;␊ |
64 | {␊ |
65 | ␉FILE *fp;␊ |
66 | ␉int f;␊ |
67 | ␉int flags, oflags;␊ |
68 | ␊ |
69 | if ((flags = __sflags(mode, &oflags)) == 0)␊ |
70 | ␉␉return (NULL);␉␊ |
71 | ␉if ((fp = __sfp(COUNT)) == NULL)␊ |
72 | ␉␉return (NULL);␊ |
73 | ␉if ((f = open(file, oflags)) < 0) {␊ |
74 | ␉␉__sfprelease(fp);␉␉/* release */␊ |
75 | ␉␉return (NULL);␊ |
76 | ␉}␊ |
77 | ␉/*␊ |
78 | ␉ * File descriptors are a full int, but _file is only a short.␊ |
79 | ␉ * If we get a valid file descriptor that is greater than␊ |
80 | ␉ * SHRT_MAX, then the fd will get sign-extended into an␊ |
81 | ␉ * invalid file descriptor. Handle this case by failing the␊ |
82 | ␉ * open.␊ |
83 | ␉ */␊ |
84 | ␉if (f > SHRT_MAX) {␊ |
85 | ␉␉fp->_flags = 0;␉␉␉/* release */␊ |
86 | ␉␉close(f);␊ |
87 | errno = EMFILE;␊ |
88 | ␉␉return (NULL);␊ |
89 | ␉}␊ |
90 | ␉fp->_file = f;␊ |
91 | ␉fp->_flags = flags;␊ |
92 | ␉fp->_cookie = fp;␊ |
93 | ␉fp->_read = __sread;␊ |
94 | ␉fp->_write = __swrite;␊ |
95 | ␉fp->_seek = __sseek;␊ |
96 | ␉fp->_close = __sclose;␊ |
97 | ␉/*␊ |
98 | ␉ * When opening in append mode, even though we use O_APPEND,␊ |
99 | ␉ * we need to seek to the end so that ftell() gets the right␊ |
100 | ␉ * answer. If the user then alters the seek pointer, or␊ |
101 | ␉ * the file extends, this will fail, but there is not much␊ |
102 | ␉ * we can do about this. (We could set __SAPP and check in␊ |
103 | ␉ * fseek and ftell.)␊ |
104 | ␉ */␊ |
105 | ␉if (oflags & O_APPEND)␊ |
106 | ␉␉(void)_sseek(fp, (fpos_t)0, SEEK_END);␊ |
107 | ␉␉return (fp);␊ |
108 | }␊ |
109 | |