xstatconv.c

Glibc 2.3.2源代码(解压后有100多M)

/* Convert between the kernel's `struct stat' format, and libc's.
   Copyright (C) 1991,1995,1996,1997,1998,2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <string.h>


static inline int
xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
{
  switch (vers)
    {
    case _STAT_VER_KERNEL:
      /* Nothing to do.  The struct is in the form the kernel expects.
         We should have short-circuted before we got here, but for
         completeness... */
      *(struct kernel_stat *) ubuf = *kbuf;
      break;

    case _STAT_VER_LINUX:
      {
	struct stat *buf = ubuf;

	/* Convert to current kernel version of `struct stat'.  */
	buf->st_dev = kbuf->st_dev;
	buf->st_pad1[0] = 0; buf->st_pad1[1] = 0; buf->st_pad1[2] = 0;
	buf->st_ino = kbuf->st_ino;
	buf->st_mode = kbuf->st_mode;
	buf->st_nlink = kbuf->st_nlink;
	buf->st_uid = kbuf->st_uid;
	buf->st_gid = kbuf->st_gid;
	buf->st_rdev = kbuf->st_rdev;
	buf->st_pad2[0] = 0; buf->st_pad2[1] = 0;
	buf->st_pad3 = 0;
	buf->st_size = kbuf->st_size;
	buf->st_blksize = kbuf->st_blksize;
	buf->st_blocks = kbuf->st_blocks;

	buf->st_atime = kbuf->st_atime; buf->__reserved0 = 0;
	buf->st_mtime = kbuf->st_mtime; buf->__reserved1 = 0;
	buf->st_ctime = kbuf->st_ctime; buf->__reserved2 = 0;

	buf->st_pad5[0] = 0; buf->st_pad5[1] = 0;
	buf->st_pad5[2] = 0; buf->st_pad5[3] = 0;
	buf->st_pad5[4] = 0; buf->st_pad5[5] = 0;
	buf->st_pad5[6] = 0; buf->st_pad5[7] = 0;
      }
      break;

    default:
      __set_errno (EINVAL);
      return -1;
    }

  return 0;
}

static inline int
xstat64_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
{
#ifdef XSTAT_IS_XSTAT64
  return xstat_conv (vers, kbuf, ubuf);
#else
  switch (vers)
    {
    case _STAT_VER_LINUX:
      {
	struct stat64 *buf = ubuf;

	buf->st_dev = kbuf->st_dev;
	buf->st_pad1[0] = 0; buf->st_pad1[1] = 0; buf->st_pad1[2] = 0;
	buf->st_ino = kbuf->st_ino;
	buf->st_mode = kbuf->st_mode;
	buf->st_nlink = kbuf->st_nlink;
	buf->st_uid = kbuf->st_uid;
	buf->st_gid = kbuf->st_gid;
	buf->st_rdev = kbuf->st_rdev;
	buf->st_pad2[0] = 0; buf->st_pad2[1] = 0; buf->st_pad2[2] = 0;
	buf->st_pad3 = 0;
	buf->st_size = kbuf->st_size;
	buf->st_blksize = kbuf->st_blksize;
	buf->st_blocks = kbuf->st_blocks;

	buf->st_atime = kbuf->st_atime; buf->__reserved0 = 0;
	buf->st_mtime = kbuf->st_mtime; buf->__reserved1 = 0;
	buf->st_ctime = kbuf->st_ctime; buf->__reserved2 = 0;

	buf->st_pad4[0] = 0; buf->st_pad4[1] = 0;
	buf->st_pad4[2] = 0; buf->st_pad4[3] = 0;
	buf->st_pad4[4] = 0; buf->st_pad4[5] = 0;
	buf->st_pad4[6] = 0; buf->st_pad4[7] = 0;
      }
      break;

      /* If struct stat64 is different from struct stat then
	 _STAT_VER_KERNEL does not make sense.  */
    case _STAT_VER_KERNEL:
    default:
      __set_errno (EINVAL);
      return -1;
    }

  return 0;
#endif
}