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 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include "namespace.h"
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <limits.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48 #include "un-namespace.h"
49 #include "local.h"
50
51 /*
52 * Small standard I/O/seek/close functions.
53 */
54 int
__sread(void * cookie,char * buf,int n)55 __sread(void *cookie, char *buf, int n)
56 {
57 FILE *fp = cookie;
58
59 return(_read(fp->_file, buf, (size_t)n));
60 }
61
62 int
__swrite(void * cookie,char const * buf,int n)63 __swrite(void *cookie, char const *buf, int n)
64 {
65 FILE *fp = cookie;
66
67 return (_write(fp->_file, buf, (size_t)n));
68 }
69
70 fpos_t
__sseek(void * cookie,fpos_t offset,int whence)71 __sseek(void *cookie, fpos_t offset, int whence)
72 {
73 FILE *fp = cookie;
74
75 return (lseek(fp->_file, (off_t)offset, whence));
76 }
77
78 int
__sclose(void * cookie)79 __sclose(void *cookie)
80 {
81
82 return (_close(((FILE *)cookie)->_file));
83 }
84
85 /*
86 * Higher level wrappers.
87 */
88 int
_sread(FILE * fp,char * buf,int n)89 _sread(FILE *fp, char *buf, int n)
90 {
91 int ret;
92
93 ret = (*fp->_read)(fp->_cookie, buf, n);
94 if (ret > 0) {
95 if (fp->_flags & __SOFF) {
96 if (fp->_offset <= OFF_MAX - ret)
97 fp->_offset += ret;
98 else
99 fp->_flags &= ~__SOFF;
100 }
101 } else if (ret < 0)
102 fp->_flags &= ~__SOFF;
103 return (ret);
104 }
105
106 int
_swrite(FILE * fp,char const * buf,int n)107 _swrite(FILE *fp, char const *buf, int n)
108 {
109 int ret;
110 int serrno;
111
112 if (fp->_flags & __SAPP) {
113 serrno = errno;
114 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
115 (fp->_flags & __SOPT))
116 return (-1);
117 errno = serrno;
118 }
119 ret = (*fp->_write)(fp->_cookie, buf, n);
120 /* __SOFF removed even on success in case O_APPEND mode is set. */
121 if (ret >= 0) {
122 if ((fp->_flags & __SOFF) && !(fp->_flags2 & __S2OAP) &&
123 fp->_offset <= OFF_MAX - ret)
124 fp->_offset += ret;
125 else
126 fp->_flags &= ~__SOFF;
127
128 } else if (ret < 0)
129 fp->_flags &= ~__SOFF;
130 return (ret);
131 }
132
133 fpos_t
_sseek(FILE * fp,fpos_t offset,int whence)134 _sseek(FILE *fp, fpos_t offset, int whence)
135 {
136 fpos_t ret;
137 int serrno, errret;
138
139 serrno = errno;
140 errno = 0;
141 ret = (*fp->_seek)(fp->_cookie, offset, whence);
142 errret = errno;
143 if (errno == 0)
144 errno = serrno;
145 /*
146 * Disallow negative seeks per POSIX.
147 * It is needed here to help upper level caller
148 * in the cases it can't detect.
149 */
150 if (ret < 0) {
151 if (errret == 0) {
152 if (offset != 0 || whence != SEEK_CUR) {
153 if (HASUB(fp))
154 FREEUB(fp);
155 fp->_p = fp->_bf._base;
156 fp->_r = 0;
157 fp->_flags &= ~__SEOF;
158 }
159 fp->_flags |= __SERR;
160 errno = EINVAL;
161 } else if (errret == ESPIPE)
162 fp->_flags &= ~__SAPP;
163 fp->_flags &= ~__SOFF;
164 ret = -1;
165 } else if (fp->_flags & __SOPT) {
166 fp->_flags |= __SOFF;
167 fp->_offset = ret;
168 }
169 return (ret);
170 }
171
172 void
__stdio_cancel_cleanup(void * arg)173 __stdio_cancel_cleanup(void * arg)
174 {
175
176 if (arg != NULL)
177 _funlockfile((FILE *)arg);
178 }
179