sysdeps/unix/bsd/bsdstat.h

   1 /* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <sys/types.h>
  21
  22 /* This will make it not define major, minor, makedev, and S_IF*.  */
  23 #undef  __USE_BSD
  24 #undef  __USE_MISC
  25 #include <sys/stat.h>
  26
  27 #undef  stat
  28 #undef  fstat
  29
  30 #undef  S_IRWXU
  31 #undef  S_IRUSR
  32 #undef  S_IWUSR
  33 #undef  S_IXUSR
  34 #undef  S_IRWXG
  35 #undef  S_IRGRP
  36 #undef  S_IWGRP
  37 #undef  S_IXGRP
  38 #undef  S_IRWXO
  39 #undef  S_IROTH
  40 #undef  S_IWOTH
  41 #undef  S_IXOTH
  42 #undef  S_ISBLK
  43 #undef  S_ISCHR
  44 #undef  S_ISDIR
  45 #undef  S_ISFIFO
  46 #undef  S_ISREG
  47 #undef  S_ISUID
  48 #undef  S_ISGID
  49 #define stat    system_stat
  50 #define fstat   system_fstat
  51 #define KERNEL                  /* Try to avoid misc decls.  */
  52 #include "/usr/include/sys/stat.h"
  53 #undef  KERNEL
  54 #undef  stat
  55 #undef  fstat
  56
  57 #define member_same(statbufp, sysbufp, member) \
  58   (offsetof(struct __stat, member) == offsetof(struct system_stat, member) && \
  59    sizeof((statbufp)->member) == sizeof((sysbufp)->member))
  60 #define need_stat_mapping(statbufp, sysbufp)                                  \
  61   (!(member_same(statbufp, sysbufp, st_dev) &&                                \
  62      member_same(statbufp, sysbufp, st_ino) &&                                \
  63      member_same(statbufp, sysbufp, st_mode) &&                               \
  64      member_same(statbufp, sysbufp, st_nlink) &&                              \
  65      member_same(statbufp, sysbufp, st_uid) &&                                \
  66      member_same(statbufp, sysbufp, st_gid) &&                                \
  67      member_same(statbufp, sysbufp, st_rdev) &&                               \
  68      member_same(statbufp, sysbufp, st_size) &&                               \
  69      member_same(statbufp, sysbufp, st_atime) &&                              \
  70      member_same(statbufp, sysbufp, st_mtime) &&                              \
  71      member_same(statbufp, sysbufp, st_ctime) &&                              \
  72      member_same(statbufp, sysbufp, st_blksize) &&                            \
  73      member_same(statbufp, sysbufp, st_blocks)))
  74
  75 /* Map a system `struct stat' to our `struct stat'.  */
  76 #ifdef  __GNUC__
  77 inline
  78 #endif
  79 static int
  80 mapstat (sysbuf, statbuf)
  81      const struct system_stat *sysbuf;
  82      struct __stat *buf;
  83 {
  84   if (buf == NULL)
  85     {
  86       errno = EINVAL;
  87       return -1;
  88     }
  89
  90   if (!need_stat_mapping(buf, sysbuf))
  91     /* Hopefully this will be optimized out.  */
  92     *buf = *(struct __stat *) sysbuf;
  93   else
  94     {
  95       buf->st_dev = (dev_t) sysbuf->st_dev;
  96       buf->st_ino = (ino_t) sysbuf->st_ino;
  97       buf->st_mode = (mode_t) sysbuf->st_mode;
  98       buf->st_nlink = (nlink_t) sysbuf->st_nlink;
  99       buf->st_uid = (uid_t) sysbuf->st_uid;
 100       buf->st_gid = (gid_t) sysbuf->st_gid;
 101       buf->st_rdev = (dev_t) sysbuf->st_rdev;
 102       buf->st_size = (size_t) sysbuf->st_size;
 103       buf->st_atime = (time_t) sysbuf->st_atime;
 104       buf->st_mtime = (time_t) sysbuf->st_mtime;
 105       buf->st_ctime = (time_t) sysbuf->st_ctime;
 106       buf->st_blksize = (size_t) sysbuf->st_blksize;
 107       buf->st_blocks = (size_t) sysbuf->st_blocks;
 108     }
 109
 110   return 0;
 111 }