sysdeps/unix/sysv/linux/mips/xstatconv.c

   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 */