1 /** @file
2 Small standard I/O/seek/close functions.
3 These maintain the `known seek offset' for seek optimisation.
4
5 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
6 This program and the accompanying materials are licensed and made available
7 under the terms and conditions of the BSD License that accompanies this
8 distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.
10
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13
14 Copyright (c) 1990, 1993
15 The Regents of the University of California. All rights reserved.
16
17 This code is derived from software contributed to Berkeley by
18 Chris Torek.
19
20 Redistribution and use in source and binary forms, with or without
21 modification, are permitted provided that the following conditions
22 are met:
23 - Redistributions of source code must retain the above copyright
24 notice, this list of conditions and the following disclaimer.
25 - Redistributions in binary form must reproduce the above copyright
26 notice, this list of conditions and the following disclaimer in the
27 documentation and/or other materials provided with the distribution.
28 - Neither the name of the University nor the names of its contributors
29 may be used to endorse or promote products derived from this software
30 without specific prior written permission.
31
32 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
33 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
36 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
37 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
38 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
40 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 POSSIBILITY OF SUCH DAMAGE.
43
44 NetBSD: stdio.c,v 1.13 2003/08/07 16:43:33 agc Exp
45 stdio.c 8.1 (Berkeley) 6/4/93
46 **/
47 #include <LibConfig.h>
48
49 #include "namespace.h"
50
51 #include <assert.h>
52 #include <errno.h>
53 #include <fcntl.h>
54 #include <stdio.h>
55 #include <unistd.h>
56
57 #include "reentrant.h"
58 #include "local.h"
59
60 int
__sread(void * cookie,char * buf,int n)61 __sread(void *cookie, char *buf, int n)
62 {
63 FILE *fp = cookie;
64 int ret;
65
66 _DIAGASSERT(fp != NULL);
67 _DIAGASSERT(buf != NULL);
68 if(fp == NULL) {
69 errno = EINVAL;
70 return (EOF);
71 }
72
73 ret = (int)read(fp->_file, buf, (size_t)n);
74 /* if the read succeeded, update the current offset */
75 if (ret >= 0)
76 fp->_offset += ret;
77 else
78 fp->_flags &= ~__SOFF; /* paranoia */
79 return (ret);
80 }
81
82 int
__swrite(void * cookie,char const * buf,int n)83 __swrite(void *cookie, char const *buf, int n)
84 {
85 FILE *fp = cookie;
86
87 _DIAGASSERT(cookie != NULL);
88 _DIAGASSERT(buf != NULL);
89 if(fp == NULL) {
90 errno = EINVAL;
91 return (EOF);
92 }
93
94 if (fp->_flags & __SAPP)
95 (void) lseek(fp->_file, (off_t)0, SEEK_END);
96 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */
97 return (int)(write(fp->_file, (char *)buf, (size_t)n));
98 }
99
100 fpos_t
__sseek(void * cookie,fpos_t offset,int whence)101 __sseek(void *cookie, fpos_t offset, int whence)
102 {
103 FILE *fp = cookie;
104 off_t ret;
105
106 _DIAGASSERT(fp != NULL);
107 if(fp == NULL) {
108 errno = EINVAL;
109 return (EOF);
110 }
111
112 ret = lseek(fp->_file, (off_t)offset, whence);
113 if (ret == -1L)
114 fp->_flags &= ~__SOFF;
115 else {
116 fp->_flags |= __SOFF;
117 fp->_offset = ret;
118 }
119 return (ret);
120 }
121
122 int
__sclose(void * cookie)123 __sclose(void *cookie)
124 {
125
126 _DIAGASSERT(cookie != NULL);
127 if(cookie == NULL) {
128 errno = EINVAL;
129 return (EOF);
130 }
131
132 return (close(((FILE *)cookie)->_file));
133 }
134