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106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <dirent.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <linux/posix_types.h>
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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extern int __getdents __P ((int fd, char *buf, size_t nbytes));
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/* For Linux we need a special version of this file since the
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definition of `struct dirent' is not the same for the kernel and
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the libc. There is one additional field which might be introduced
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in the kernel structure in the future.
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He is the kernel definition of `struct dirent' as of 2.1.20: */
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struct kernel_dirent
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{
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long int d_ino;
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__kernel_off_t d_off;
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unsigned short int d_reclen;
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char d_name[256];
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};
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/* The problem here is that we cannot simply read the next NBYTES
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bytes. We need to take the additional field into account. We use
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some heuristic. Assume the directory contains names with at least
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3 characters we can compute a maximum number of entries which fit
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in the buffer. Taking this number allows us to specify a correct
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number of bytes to read. If we should be wrong, we can reset the
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file descriptor. */
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int __getdirentries __P ((int fd, char *buf, size_t nbytes, off_t *basep));
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int
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__getdirentries (fd, buf, nbytes, basep)
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int fd;
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char *buf;
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size_t nbytes;
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off_t *basep;
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{
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off_t base = __lseek (fd, (off_t) 0, SEEK_CUR);
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size_t red_nbytes;
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struct kernel_dirent *kdp;
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struct dirent *dp;
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int retval;
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red_nbytes = nbytes - (nbytes / (offsetof (struct dirent, d_name) + 3));
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dp = (struct dirent *) buf;
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kdp = (struct kernel_dirent *) (buf + (nbytes - red_nbytes));
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retval = __getdents (fd, (char *) kdp, red_nbytes);
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while ((char *) kdp < buf + (nbytes - red_nbytes) + retval)
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{
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dp->d_ino = kdp->d_ino;
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dp->d_off = kdp->d_off;
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dp->d_reclen = (kdp->d_reclen
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+ (offsetof (struct dirent, d_name)
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- offsetof (struct kernel_dirent, d_name)));
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dp->d_type = DT_UNKNOWN;
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memmove (dp->d_name, kdp->d_name,
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kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
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dp = (struct dirent *) (((char *) dp) + dp->d_reclen);
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kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
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if ((char *) dp >= (char *) kdp)
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{
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/* Our heuristic failed. We read too many entries. Reset
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the stream. */
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off_t used = ((char *) kdp - (char *) buf) - (nbytes - red_nbytes);
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base = __lseek (fd, retval - used, SEEK_CUR);
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}
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}
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if (basep)
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*basep = base;
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return (char *) dp - (char *) buf;
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}
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weak_alias (__getdirentries, getdirentries)
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