mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 02:40:06 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* Get directory entries. Linux/MIPSn64 LFS version.
|
|
Copyright (C) 2018-2019 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <sys/param.h>
|
|
#include <unistd.h>
|
|
#include <scratch_buffer.h>
|
|
|
|
ssize_t
|
|
__getdents64 (int fd, char *buf, size_t nbytes)
|
|
{
|
|
#ifdef __NR_getdents64
|
|
ssize_t ret = INLINE_SYSCALL_CALL (getdents64, fd, buf, nbytes);
|
|
if (ret != -1)
|
|
return ret;
|
|
#endif
|
|
|
|
/* Unfortunately getdents64 was only wire-up for MIPS n64 on Linux 3.10.
|
|
If syscall is not available it need to fallback to non-LFS one. */
|
|
|
|
struct kernel_dirent
|
|
{
|
|
unsigned long d_ino;
|
|
unsigned long d_off;
|
|
unsigned short int d_reclen;
|
|
char d_name[256];
|
|
};
|
|
|
|
const size_t size_diff = (offsetof (struct dirent64, d_name)
|
|
- offsetof (struct kernel_dirent, d_name));
|
|
|
|
size_t red_nbytes = MIN (nbytes
|
|
- ((nbytes / (offsetof (struct dirent64, d_name)
|
|
+ 14)) * size_diff),
|
|
nbytes - size_diff);
|
|
|
|
struct scratch_buffer tmpbuf;
|
|
scratch_buffer_init (&tmpbuf);
|
|
if (!scratch_buffer_set_array_size (&tmpbuf, red_nbytes, sizeof (uint8_t)))
|
|
INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);
|
|
|
|
struct kernel_dirent *skdp, *kdp;
|
|
skdp = kdp = tmpbuf.data;
|
|
|
|
ssize_t retval = INLINE_SYSCALL_CALL (getdents, fd, kdp, red_nbytes);
|
|
if (retval == -1)
|
|
{
|
|
scratch_buffer_free (&tmpbuf);
|
|
return -1;
|
|
}
|
|
|
|
off64_t last_offset = -1;
|
|
struct dirent64 *dp = (struct dirent64 *) buf;
|
|
while ((char *) kdp < (char *) skdp + retval)
|
|
{
|
|
const size_t alignment = _Alignof (struct dirent64);
|
|
/* Since kdp->d_reclen is already aligned for the kernel structure
|
|
this may compute a value that is bigger than necessary. */
|
|
size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
|
|
& ~(alignment - 1));
|
|
if ((char *) dp + new_reclen > buf + nbytes)
|
|
{
|
|
/* Our heuristic failed. We read too many entries. Reset
|
|
the stream. */
|
|
assert (last_offset != -1);
|
|
__lseek64 (fd, last_offset, SEEK_SET);
|
|
|
|
if ((char *) dp == buf)
|
|
{
|
|
scratch_buffer_free (&tmpbuf);
|
|
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
last_offset = kdp->d_off;
|
|
dp->d_ino = kdp->d_ino;
|
|
dp->d_off = kdp->d_off;
|
|
dp->d_reclen = new_reclen;
|
|
dp->d_type = *((char *) kdp + kdp->d_reclen - 1);
|
|
memcpy (dp->d_name, kdp->d_name,
|
|
kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
|
|
|
|
dp = (struct dirent64 *) ((char *) dp + new_reclen);
|
|
kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
|
|
}
|
|
|
|
scratch_buffer_free (&tmpbuf);
|
|
return (char *) dp - buf;
|
|
}
|
|
#if _DIRENT_MATCHES_DIRENT64
|
|
strong_alias (__getdents64, __getdents)
|
|
#endif
|