diff options
Diffstat (limited to 'sysdeps/unix/sysv/sysv4/solaris2/getdents.c')
| -rw-r--r-- | sysdeps/unix/sysv/sysv4/solaris2/getdents.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/sysdeps/unix/sysv/sysv4/solaris2/getdents.c b/sysdeps/unix/sysv/sysv4/solaris2/getdents.c deleted file mode 100644 index ab782ffaac..0000000000 --- a/sysdeps/unix/sysv/sysv4/solaris2/getdents.c +++ /dev/null @@ -1,114 +0,0 @@ -/* Copyright (C) 1993,95,96,97,98, 2004 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 <alloca.h> -#include <dirent.h> -#include <stddef.h> -#include <string.h> -#include <unistd.h> -#include <sys/param.h> -#include <sys/types.h> - -#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) - - -extern int __getdents (int fd, char *buf, size_t nbytes); - -/* For Solaris we need a special version of this file since the - definition of `struct dirent' is not the same for the kernel and - the libc. There is one additional field which might be introduced - in the kernel structure in the future. - - He is the system definition of `struct dirent' as of 2.6: */ - -struct kernel_dirent - { - ino_t d_ino; - off_t d_off; - unsigned short int d_reclen; - char d_name[256]; - }; - -#ifdef GETDENTS64 -#define __getdirentries __getdirentries64 -#define dirent dirent64 -#endif - -/* The problem here is that we cannot simply read the next NBYTES - bytes. We need to take the additional field into account. We use - some heuristic. Assuming the directory contains names with 14 - characters on average we can compute an estimate number of entries - which fit in the buffer. Taking this number allows us to specify a - correct number of bytes to read. If we should be wrong, we can reset - the file descriptor. */ -ssize_t -__getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) -{ - off_t base = __lseek (fd, (off_t) 0, SEEK_CUR); - off_t last_offset = base; - size_t red_nbytes; - struct kernel_dirent *skdp, *kdp; - struct dirent *dp; - int retval; - const size_t size_diff = (offsetof (struct dirent, d_name) - - offsetof (struct kernel_dirent, d_name)); - - red_nbytes = nbytes - ((nbytes / (offsetof (struct dirent, d_name) + 14)) - * size_diff); - - dp = (struct dirent *) buf; - skdp = kdp = __alloca (red_nbytes); - - retval = __getdents (fd, (char *) kdp, red_nbytes); - - while ((char *) kdp < (char *) skdp + retval) - { - const size_t alignment = __alignof__ (struct dirent); - /* 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. */ - __lseek (fd, last_offset, SEEK_SET); - 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 = DT_UNKNOWN; - memcpy (dp->d_name, kdp->d_name, - kdp->d_reclen - offsetof (struct kernel_dirent, d_name)); - - dp = (struct dirent *) ((char *) dp + new_reclen); - kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen); - } - - if (basep) - *basep = base; - - return (char *) dp - buf; -} - -#ifndef GETDENTS64 -weak_alias (__getdirentries, getdirentries) -#endif |