1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr_arch_file_io.h"
static apr_status_t setptr(apr_file_t *thefile, apr_off_t pos )
{
apr_off_t newbufpos;
apr_status_t rv;
if (thefile->direction == 1) {
rv = apr_file_flush_locked(thefile);
if (rv) {
return rv;
}
thefile->bufpos = thefile->direction = thefile->dataRead = 0;
}
newbufpos = pos - (thefile->filePtr - thefile->dataRead);
if (newbufpos >= 0 && newbufpos <= thefile->dataRead) {
thefile->bufpos = newbufpos;
rv = APR_SUCCESS;
}
else {
if (lseek(thefile->filedes, pos, SEEK_SET) != -1) {
thefile->bufpos = thefile->dataRead = 0;
thefile->filePtr = pos;
rv = APR_SUCCESS;
}
else {
rv = errno;
}
}
return rv;
}
APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile, apr_seek_where_t where, apr_off_t *offset)
{
apr_off_t rv;
thefile->eof_hit = 0;
if (thefile->buffered) {
int rc = EINVAL;
apr_finfo_t finfo;
file_lock(thefile);
switch (where) {
case APR_SET:
rc = setptr(thefile, *offset);
break;
case APR_CUR:
rc = setptr(thefile, thefile->filePtr - thefile->dataRead + thefile->bufpos + *offset);
break;
case APR_END:
rc = apr_file_info_get_locked(&finfo, APR_FINFO_SIZE, thefile);
if (rc == APR_SUCCESS)
rc = setptr(thefile, finfo.size + *offset);
break;
}
*offset = thefile->filePtr - thefile->dataRead + thefile->bufpos;
file_unlock(thefile);
return rc;
}
else {
rv = lseek(thefile->filedes, *offset, where);
if (rv == -1) {
*offset = -1;
return errno;
}
else {
*offset = rv;
return APR_SUCCESS;
}
}
}
apr_status_t apr_file_trunc(apr_file_t *fp, apr_off_t offset)
{
if (fp->buffered) {
int rc = 0;
file_lock(fp);
if (fp->direction == 1 && fp->bufpos != 0) {
apr_off_t len = fp->filePtr + fp->bufpos;
if (offset < len) {
/* New file end fall below our write buffer limit.
* Figure out if and what needs to be flushed.
*/
apr_off_t off = len - offset;
if (off >= 0 && off <= fp->bufpos)
fp->bufpos = fp->bufpos - (size_t)off;
else
fp->bufpos = 0;
}
rc = apr_file_flush_locked(fp);
/* Reset buffer positions for write mode */
fp->bufpos = fp->direction = fp->dataRead = 0;
}
else if (fp->direction == 0) {
/* Discard the read buffer, as we are about to reposition
* ourselves to the end of file.
*/
fp->bufpos = 0;
fp->dataRead = 0;
}
file_unlock(fp);
if (rc) {
return rc;
}
}
if (ftruncate(fp->filedes, offset) == -1) {
return errno;
}
return apr_file_seek(fp, APR_SET, &offset);
}
|
