1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "namespace.h"
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <limits.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <unistd.h>
42 #include "un-namespace.h"
43 #include "local.h"
44
45 /*
46 * Small standard I/O/seek/close functions.
47 */
48 int
__sread(void * cookie,char * buf,int n)49 __sread(void *cookie, char *buf, int n)
50 {
51 FILE *fp = cookie;
52
53 return(_read(fp->_file, buf, (size_t)n));
54 }
55
56 int
__swrite(void * cookie,char const * buf,int n)57 __swrite(void *cookie, char const *buf, int n)
58 {
59 FILE *fp = cookie;
60
61 return (_write(fp->_file, buf, (size_t)n));
62 }
63
64 fpos_t
__sseek(void * cookie,fpos_t offset,int whence)65 __sseek(void *cookie, fpos_t offset, int whence)
66 {
67 FILE *fp = cookie;
68
69 return (lseek(fp->_file, (off_t)offset, whence));
70 }
71
72 int
__sclose(void * cookie)73 __sclose(void *cookie)
74 {
75
76 return (_close(((FILE *)cookie)->_file));
77 }
78
79 /*
80 * Higher level wrappers.
81 */
82 int
_sread(FILE * fp,char * buf,int n)83 _sread(FILE *fp, char *buf, int n)
84 {
85 int ret;
86
87 ret = (*fp->_read)(fp->_cookie, buf, n);
88 if (ret > 0) {
89 if (fp->_flags & __SOFF) {
90 if (fp->_offset <= OFF_MAX - ret)
91 fp->_offset += ret;
92 else
93 fp->_flags &= ~__SOFF;
94 }
95 } else if (ret < 0)
96 fp->_flags &= ~__SOFF;
97 return (ret);
98 }
99
100 int
_swrite(FILE * fp,char const * buf,int n)101 _swrite(FILE *fp, char const *buf, int n)
102 {
103 int ret;
104 int serrno;
105
106 if (fp->_flags & __SAPP) {
107 serrno = errno;
108 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
109 (fp->_flags & __SOPT))
110 return (-1);
111 errno = serrno;
112 }
113 ret = (*fp->_write)(fp->_cookie, buf, n);
114 /* __SOFF removed even on success in case O_APPEND mode is set. */
115 if (ret >= 0) {
116 if ((fp->_flags & __SOFF) && !(fp->_flags2 & __S2OAP) &&
117 fp->_offset <= OFF_MAX - ret)
118 fp->_offset += ret;
119 else
120 fp->_flags &= ~__SOFF;
121
122 } else if (ret < 0)
123 fp->_flags &= ~__SOFF;
124 return (ret);
125 }
126
127 fpos_t
_sseek(FILE * fp,fpos_t offset,int whence)128 _sseek(FILE *fp, fpos_t offset, int whence)
129 {
130 fpos_t ret;
131 int serrno, errret;
132
133 serrno = errno;
134 errno = 0;
135 ret = (*fp->_seek)(fp->_cookie, offset, whence);
136 errret = errno;
137 if (errno == 0)
138 errno = serrno;
139 /*
140 * Disallow negative seeks per POSIX.
141 * It is needed here to help upper level caller
142 * in the cases it can't detect.
143 */
144 if (ret < 0) {
145 if (errret == 0) {
146 if (offset != 0 || whence != SEEK_CUR) {
147 if (HASUB(fp))
148 FREEUB(fp);
149 fp->_p = fp->_bf._base;
150 fp->_r = 0;
151 fp->_flags &= ~__SEOF;
152 }
153 fp->_flags |= __SERR;
154 errno = EINVAL;
155 } else if (errret == ESPIPE)
156 fp->_flags &= ~__SAPP;
157 fp->_flags &= ~__SOFF;
158 ret = -1;
159 } else if (fp->_flags & __SOPT) {
160 fp->_flags |= __SOFF;
161 fp->_offset = ret;
162 }
163 return (ret);
164 }
165
166 void
__stdio_cancel_cleanup(void * arg)167 __stdio_cancel_cleanup(void * arg)
168 {
169
170 if (arg != NULL)
171 _funlockfile((FILE *)arg);
172 }
173