diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c deleted file mode 100644 index 7158fd1752..0000000000 --- a/sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c +++ /dev/null @@ -1,115 +0,0 @@ -/* Copyright (C) 1993-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Simplified from sysdeps/unix/sysv/linux/getdents.c. - - 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 <alloca.h> -#include <assert.h> -#include <errno.h> -#include <dirent.h> -#include <stddef.h> -#include <stdint.h> -#include <string.h> -#include <unistd.h> -#include <sys/param.h> -#include <sys/types.h> - -#include <sysdep.h> -#include <sys/syscall.h> - -/* Pack the dirent64 struct down into 32-bit offset/inode fields, and - ensure that no overflow occurs. */ -ssize_t -__getdents (int fd, char *buf, size_t nbytes) -{ - union - { - struct dirent64 k; /* Kernel structure. */ - struct dirent u; - char b[1]; - } *kbuf = (void *) buf, *outp, *inp; - size_t kbytes = nbytes; - off64_t last_offset = -1; - ssize_t retval; - - const size_t size_diff = (offsetof (struct dirent64, d_name) - - offsetof (struct dirent, d_name)); - if (nbytes <= sizeof (struct dirent)) - { - kbytes = nbytes + offsetof (struct dirent64, d_name) - - offsetof (struct dirent, d_name); - kbuf = __alloca(kbytes); - } - - retval = INLINE_SYSCALL (getdents64, 3, fd, kbuf, kbytes); - if (retval == -1) - return -1; - - /* These two pointers might alias the same memory buffer. - Standard C requires that we always use the same type for them, - so we must use the union type. */ - inp = kbuf; - outp = (void *) buf; - - while (&inp->b < &kbuf->b + retval) - { - const size_t alignment = __alignof__ (struct dirent); - /* Since inp->k.d_reclen is already aligned for the kernel - structure this may compute a value that is bigger - than necessary. */ - size_t old_reclen = inp->k.d_reclen; - size_t new_reclen = ((old_reclen - size_diff + alignment - 1) - & ~(alignment - 1)); - - /* Copy the data out of the old structure into temporary space. - Then copy the name, which may overlap if BUF == KBUF. */ - const uint64_t d_ino = inp->k.d_ino; - const int64_t d_off = inp->k.d_off; - const uint8_t d_type = inp->k.d_type; - - memmove (outp->u.d_name, inp->k.d_name, - old_reclen - offsetof (struct dirent64, d_name)); - - /* Now we have copied the data from INP and access only OUTP. */ - - outp->u.d_ino = d_ino; - outp->u.d_off = d_off; - if ((sizeof (outp->u.d_ino) != sizeof (inp->k.d_ino) - && outp->u.d_ino != d_ino) - || (sizeof (outp->u.d_off) != sizeof (inp->k.d_off) - && outp->u.d_off != d_off)) - { - /* Overflow. If there was at least one entry before this one, - return them without error, otherwise signal overflow. */ - if (last_offset != -1) - { - __lseek64 (fd, last_offset, SEEK_SET); - return outp->b - buf; - } - __set_errno (EOVERFLOW); - return -1; - } - - last_offset = d_off; - outp->u.d_reclen = new_reclen; - outp->u.d_type = d_type; - - inp = (void *) inp + old_reclen; - outp = (void *) outp + new_reclen; - } - - return outp->b - buf; -} |