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