1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <unistd.h>
33 #include <sys/types.h>
34 #include <dirent.h>
35 #ifdef LOSCFG_FS_VFS
36 #include <fs/fs.h>
37
_lseek(int fd,off_t offset,int whence)38 off_t _lseek(int fd, off_t offset, int whence)
39 {
40 int ret;
41 struct file *filep = NULL;
42
43 /* Get the file structure corresponding to the file descriptor. */
44 ret = fs_getfilep(fd, &filep);
45 if (ret < 0) {
46 /* The errno value has already been set */
47 return (off_t)-get_errno();
48 }
49
50 /* libc seekdir function should set the whence to SEEK_SET, so we can discard
51 * the whence argument here */
52 if (filep->f_oflags & O_DIRECTORY) {
53 /* defensive coding */
54 if (filep->f_dir == NULL) {
55 return (off_t)-EINVAL;
56 }
57 if (offset == 0) {
58 rewinddir(filep->f_dir);
59 } else {
60 seekdir(filep->f_dir, offset);
61 }
62 ret = telldir(filep->f_dir);
63 if (ret < 0) {
64 return (off_t)-get_errno();
65 }
66 return ret;
67 }
68
69 /* Then let file_seek do the real work */
70 ret = file_seek(filep, offset, whence);
71 if (ret < 0) {
72 return -get_errno();
73 }
74 return ret;
75 }
76
_lseek64(int fd,int offsetHigh,int offsetLow,off64_t * result,int whence)77 off64_t _lseek64(int fd, int offsetHigh, int offsetLow, off64_t *result, int whence)
78 {
79 off64_t ret;
80 struct file *filep = NULL;
81 off64_t offset = ((off64_t)offsetHigh << 32) + (uint)offsetLow; /* 32: offsetHigh is high 32 bits */
82
83 /* Get the file structure corresponding to the file descriptor. */
84 ret = fs_getfilep(fd, &filep);
85 if (ret < 0) {
86 /* The errno value has already been set */
87 return (off64_t)-get_errno();
88 }
89
90 /* libc seekdir function should set the whence to SEEK_SET, so we can discard
91 * the whence argument here */
92 if (filep->f_oflags & O_DIRECTORY) {
93 /* defensive coding */
94 if (filep->f_dir == NULL) {
95 return (off64_t)-EINVAL;
96 }
97 if (offsetLow == 0) {
98 rewinddir(filep->f_dir);
99 } else {
100 seekdir(filep->f_dir, offsetLow);
101 }
102 ret = telldir(filep->f_dir);
103 if (ret < 0) {
104 return (off64_t)-get_errno();
105 }
106 goto out;
107 }
108
109 /* Then let file_seek do the real work */
110 ret = file_seek64(filep, offset, whence);
111 if (ret < 0) {
112 return (off64_t)-get_errno();
113 }
114
115 out:
116 *result = ret;
117
118 return 0;
119 }
120
121 #endif
122