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