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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <sys/types.h>
  22
  23 /* This will make it not define major, minor, makedev, and S_IF*.  */
  24 #undef  __USE_BSD
  25 #undef  __USE_MISC
  26 #include <sys/stat.h>
  27
  28 #undef  stat
  29 #undef  fstat
  30
  31 #undef  S_IRWXU
  32 #undef  S_IRUSR
  33 #undef  S_IWUSR
  34 #undef  S_IXUSR
  35 #undef  S_IRWXG
  36 #undef  S_IRGRP
  37 #undef  S_IWGRP
  38 #undef  S_IXGRP
  39 #undef  S_IRWXO
  40 #undef  S_IROTH
  41 #undef  S_IWOTH
  42 #undef  S_IXOTH
  43 #undef  S_ISBLK
  44 #undef  S_ISCHR
  45 #undef  S_ISDIR
  46 #undef  S_ISFIFO
  47 #undef  S_ISREG
  48 #undef  S_ISUID
  49 #undef  S_ISGID
  50 #define stat    system_stat
  51 #define fstat   system_fstat
  52 #define KERNEL                  /* Try to avoid misc decls.  */
  53 #include "/usr/include/sys/stat.h"
  54 #undef  KERNEL
  55 #undef  stat
  56 #undef  fstat
  57
  58 #define member_same(statbufp, sysbufp, member) \
  59   (offsetof(struct __stat, member) == offsetof(struct system_stat, member) && \
  60    sizeof((statbufp)->member) == sizeof((sysbufp)->member))
  61 #define need_stat_mapping(statbufp, sysbufp)                                  \
  62   (!(member_same(statbufp, sysbufp, st_dev) &&                                \
  63      member_same(statbufp, sysbufp, st_ino) &&                                \
  64      member_same(statbufp, sysbufp, st_mode) &&                               \
  65      member_same(statbufp, sysbufp, st_nlink) &&                              \
  66      member_same(statbufp, sysbufp, st_uid) &&                                \
  67      member_same(statbufp, sysbufp, st_gid) &&                                \
  68      member_same(statbufp, sysbufp, st_rdev) &&                               \
  69      member_same(statbufp, sysbufp, st_size) &&                               \
  70      member_same(statbufp, sysbufp, st_atime) &&                              \
  71      member_same(statbufp, sysbufp, st_mtime) &&                              \
  72      member_same(statbufp, sysbufp, st_ctime) &&                              \
  73      member_same(statbufp, sysbufp, st_blksize) &&                            \
  74      member_same(statbufp, sysbufp, st_blocks)))
  75
  76 /* Map a system `struct stat' to our `struct stat'.  */
  77 #ifdef  __GNUC__
  78 inline
  79 #endif
  80 static int
  81 mapstat (sysbuf, statbuf)
  82      const struct system_stat *sysbuf;
  83      struct __stat *buf;
  84 {
  85   if (buf == NULL)
  86     {
  87       errno = EINVAL;
  88       return -1;
  89     }
  90
  91   if (!need_stat_mapping(buf, sysbuf))
  92     /* Hopefully this will be optimized out.  */
  93     *buf = *(struct __stat *) sysbuf;
  94   else
  95     {
  96       buf->st_dev = (dev_t) sysbuf->st_dev;
  97       buf->st_ino = (ino_t) sysbuf->st_ino;
  98       buf->st_mode = (mode_t) sysbuf->st_mode;
  99       buf->st_nlink = (nlink_t) sysbuf->st_nlink;
 100       buf->st_uid = (uid_t) sysbuf->st_uid;
 101       buf->st_gid = (gid_t) sysbuf->st_gid;
 102       buf->st_rdev = (dev_t) sysbuf->st_rdev;
 103       buf->st_size = (size_t) sysbuf->st_size;
 104       buf->st_atime = (time_t) sysbuf->st_atime;
 105       buf->st_mtime = (time_t) sysbuf->st_mtime;
 106       buf->st_ctime = (time_t) sysbuf->st_ctime;
 107       buf->st_blksize = (size_t) sysbuf->st_blksize;
 108       buf->st_blocks = (size_t) sysbuf->st_blocks;
 109     }
 110
 111   return 0;
 112 }