1 /* Convert between the kernel's `struct stat' format, and libc's.
2 Copyright (C) 1991-2023 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 */