1 | /* Convert between the kernel's `struct stat' format, and libc's. |
2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library. If not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <sys/stat.h> |
21 | #include <kernel_stat.h> |
22 | |
23 | #include <string.h> |
24 | |
25 | int |
26 | __xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf) |
27 | { |
28 | switch (vers) |
29 | { |
30 | case _STAT_VER_KERNEL: |
31 | /* Nothing to do. The struct is in the form the kernel expects. |
32 | We should have short-circuted before we got here, but for |
33 | completeness... */ |
34 | *(struct kernel_stat *) ubuf = *kbuf; |
35 | break; |
36 | |
37 | case _STAT_VER_LINUX: |
38 | { |
39 | struct stat *buf = ubuf; |
40 | |
41 | /* Convert to current kernel version of `struct stat'. */ |
42 | buf->st_dev = kbuf->st_dev; |
43 | memset (&buf->st_pad1, 0, sizeof (buf->st_pad1)); |
44 | buf->st_ino = kbuf->st_ino; |
45 | /* Check for overflow. */ |
46 | if (buf->st_ino != kbuf->st_ino) |
47 | { |
48 | __set_errno (EOVERFLOW); |
49 | return -1; |
50 | } |
51 | buf->st_mode = kbuf->st_mode; |
52 | buf->st_nlink = kbuf->st_nlink; |
53 | buf->st_uid = kbuf->st_uid; |
54 | buf->st_gid = kbuf->st_gid; |
55 | buf->st_rdev = kbuf->st_rdev; |
56 | memset (&buf->st_pad2, 0, sizeof (buf->st_pad2)); |
57 | buf->st_size = kbuf->st_size; |
58 | /* Check for overflow. */ |
59 | if (buf->st_size != kbuf->st_size) |
60 | { |
61 | __set_errno (EOVERFLOW); |
62 | return -1; |
63 | } |
64 | buf->st_pad3 = 0; |
65 | buf->st_atim.tv_sec = kbuf->st_atime_sec; |
66 | buf->st_atim.tv_nsec = kbuf->st_atime_nsec; |
67 | buf->st_mtim.tv_sec = kbuf->st_mtime_sec; |
68 | buf->st_mtim.tv_nsec = kbuf->st_mtime_nsec; |
69 | buf->st_ctim.tv_sec = kbuf->st_ctime_sec; |
70 | buf->st_ctim.tv_nsec = kbuf->st_ctime_nsec; |
71 | buf->st_blksize = kbuf->st_blksize; |
72 | buf->st_blocks = kbuf->st_blocks; |
73 | /* Check for overflow. */ |
74 | if (buf->st_blocks != kbuf->st_blocks) |
75 | { |
76 | __set_errno (EOVERFLOW); |
77 | return -1; |
78 | } |
79 | memset (&buf->st_pad5, 0, sizeof (buf->st_pad5)); |
80 | } |
81 | break; |
82 | |
83 | default: |
84 | __set_errno (EINVAL); |
85 | return -1; |
86 | } |
87 | |
88 | return 0; |
89 | } |
90 | |
91 | int |
92 | __xstat64_conv (int vers, struct kernel_stat *kbuf, void *ubuf) |
93 | { |
94 | #if XSTAT_IS_XSTAT64 |
95 | return xstat_conv (vers, kbuf, ubuf); |
96 | #else |
97 | switch (vers) |
98 | { |
99 | case _STAT_VER_LINUX: |
100 | { |
101 | struct stat64 *buf = ubuf; |
102 | |
103 | buf->st_dev = kbuf->st_dev; |
104 | memset (&buf->st_pad1, 0, sizeof (buf->st_pad1)); |
105 | buf->st_ino = kbuf->st_ino; |
106 | buf->st_mode = kbuf->st_mode; |
107 | buf->st_nlink = kbuf->st_nlink; |
108 | buf->st_uid = kbuf->st_uid; |
109 | buf->st_gid = kbuf->st_gid; |
110 | buf->st_rdev = kbuf->st_rdev; |
111 | memset (&buf->st_pad2, 0, sizeof (buf->st_pad2)); |
112 | buf->st_pad3 = 0; |
113 | buf->st_size = kbuf->st_size; |
114 | buf->st_blksize = kbuf->st_blksize; |
115 | buf->st_blocks = kbuf->st_blocks; |
116 | |
117 | buf->st_atim.tv_sec = kbuf->st_atime_sec; |
118 | buf->st_atim.tv_nsec = kbuf->st_atime_nsec; |
119 | buf->st_mtim.tv_sec = kbuf->st_mtime_sec; |
120 | buf->st_mtim.tv_nsec = kbuf->st_mtime_nsec; |
121 | buf->st_ctim.tv_sec = kbuf->st_ctime_sec; |
122 | buf->st_ctim.tv_nsec = kbuf->st_ctime_nsec; |
123 | |
124 | memset (&buf->st_pad4, 0, sizeof (buf->st_pad4)); |
125 | } |
126 | break; |
127 | |
128 | /* If struct stat64 is different from struct stat then |
129 | _STAT_VER_KERNEL does not make sense. */ |
130 | case _STAT_VER_KERNEL: |
131 | default: |
132 | __set_errno (EINVAL); |
133 | return -1; |
134 | } |
135 | |
136 | return 0; |
137 | #endif |
138 | } |
139 | |
140 | #if _MIPS_SIM == _ABIO32 |
141 | int |
142 | __xstat32_conv (int vers, struct stat64 *kbuf, struct stat *buf) |
143 | { |
144 | switch (vers) |
145 | { |
146 | case _STAT_VER_LINUX: |
147 | /* Convert current kernel version of `struct stat64' to |
148 | `struct stat'. The layout of the fields in the kernel's |
149 | stat64 is the same as that in the user stat64; the only |
150 | difference is that the latter has more trailing padding. */ |
151 | buf->st_dev = kbuf->st_dev; |
152 | memset (&buf->st_pad1, 0, sizeof (buf->st_pad1)); |
153 | buf->st_ino = kbuf->st_ino; |
154 | /* Check for overflow. */ |
155 | if (buf->st_ino != kbuf->st_ino) |
156 | { |
157 | __set_errno (EOVERFLOW); |
158 | return -1; |
159 | } |
160 | buf->st_mode = kbuf->st_mode; |
161 | buf->st_nlink = kbuf->st_nlink; |
162 | buf->st_uid = kbuf->st_uid; |
163 | buf->st_gid = kbuf->st_gid; |
164 | buf->st_rdev = kbuf->st_rdev; |
165 | memset (&buf->st_pad2, 0, sizeof (buf->st_pad2)); |
166 | buf->st_size = kbuf->st_size; |
167 | /* Check for overflow. */ |
168 | if (buf->st_size != kbuf->st_size) |
169 | { |
170 | __set_errno (EOVERFLOW); |
171 | return -1; |
172 | } |
173 | buf->st_pad3 = 0; |
174 | buf->st_atim.tv_sec = kbuf->st_atim.tv_sec; |
175 | buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec; |
176 | buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec; |
177 | buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec; |
178 | buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec; |
179 | buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec; |
180 | buf->st_blksize = kbuf->st_blksize; |
181 | buf->st_blocks = kbuf->st_blocks; |
182 | /* Check for overflow. */ |
183 | if (buf->st_blocks != kbuf->st_blocks) |
184 | { |
185 | __set_errno (EOVERFLOW); |
186 | return -1; |
187 | } |
188 | memset (&buf->st_pad5, 0, sizeof (buf->st_pad5)); |
189 | break; |
190 | |
191 | /* If struct stat64 is different from struct stat then |
192 | _STAT_VER_KERNEL does not make sense. */ |
193 | case _STAT_VER_KERNEL: |
194 | default: |
195 | __set_errno (EINVAL); |
196 | return -1; |
197 | } |
198 | |
199 | return 0; |
200 | } |
201 | #endif /* _MIPS_SIM == _ABIO32 */ |
202 | |