1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "apr_arch_file_io.h"
18 #include "apr_file_io.h"
19 #include "apr_lib.h"
20 #include <string.h>
21 #include <io.h>
22
23
setptr(apr_file_t * thefile,unsigned long pos)24 static apr_status_t setptr(apr_file_t *thefile, unsigned long pos )
25 {
26 long newbufpos;
27 ULONG rc;
28
29 if (thefile->direction == 1) {
30 /* XXX: flush here is not mutex protected */
31 apr_status_t rv = apr_file_flush(thefile);
32
33 if (rv != APR_SUCCESS) {
34 return rv;
35 }
36
37 thefile->bufpos = thefile->direction = thefile->dataRead = 0;
38 }
39
40 newbufpos = pos - (thefile->filePtr - thefile->dataRead);
41 if (newbufpos >= 0 && newbufpos <= thefile->dataRead) {
42 thefile->bufpos = newbufpos;
43 rc = 0;
44 } else {
45 rc = DosSetFilePtr(thefile->filedes, pos, FILE_BEGIN, &thefile->filePtr );
46
47 if ( !rc )
48 thefile->bufpos = thefile->dataRead = 0;
49 }
50
51 return APR_FROM_OS_ERROR(rc);
52 }
53
54
55
apr_file_seek(apr_file_t * thefile,apr_seek_where_t where,apr_off_t * offset)56 APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile, apr_seek_where_t where, apr_off_t *offset)
57 {
58 if (!thefile->isopen) {
59 return APR_EBADF;
60 }
61
62 thefile->eof_hit = 0;
63
64 if (thefile->buffered) {
65 int rc = EINVAL;
66 apr_finfo_t finfo;
67
68 switch (where) {
69 case APR_SET:
70 rc = setptr(thefile, *offset);
71 break;
72
73 case APR_CUR:
74 rc = setptr(thefile, thefile->filePtr - thefile->dataRead + thefile->bufpos + *offset);
75 break;
76
77 case APR_END:
78 rc = apr_file_info_get(&finfo, APR_FINFO_NORM, thefile);
79 if (rc == APR_SUCCESS)
80 rc = setptr(thefile, finfo.size + *offset);
81 break;
82 }
83
84 *offset = thefile->filePtr - thefile->dataRead + thefile->bufpos;
85 return rc;
86 } else {
87 switch (where) {
88 case APR_SET:
89 where = FILE_BEGIN;
90 break;
91
92 case APR_CUR:
93 where = FILE_CURRENT;
94 break;
95
96 case APR_END:
97 where = FILE_END;
98 break;
99 }
100
101 return APR_FROM_OS_ERROR(DosSetFilePtr(thefile->filedes, *offset, where, (ULONG *)offset));
102 }
103 }
104
105
106
apr_file_trunc(apr_file_t * fp,apr_off_t offset)107 APR_DECLARE(apr_status_t) apr_file_trunc(apr_file_t *fp, apr_off_t offset)
108 {
109 int rc = DosSetFileSize(fp->filedes, offset);
110
111 if (rc != 0) {
112 return APR_FROM_OS_ERROR(rc);
113 }
114
115 if (fp->buffered) {
116 return setptr(fp, offset);
117 }
118
119 return APR_SUCCESS;
120 }
121