f86e60008b
o Remove All Rights Reserved from my notices o imp@FreeBSD.org everywhere o regularize punctiation, eliminate date ranges o Make sure that it's clear that I don't claim All Rights reserved by listing All Rights Reserved on same line as other copyright holders (but not me). Other such holders are also listed last where it's clear.
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*-
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* Copyright (c) 2017 M. Warner Losh <imp@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define _WANT_FREEBSD11_DIRENT
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/syscall.h>
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#include "compat-ino64.h"
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#include <dirent.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "libc_private.h"
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static ssize_t
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__cvt_dirents_from11(const char *de11, ssize_t len11, char *de, ssize_t len)
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{
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struct dirent *dst;
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const struct freebsd11_dirent *src;
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const char *edst, *esrc;
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ssize_t rlen;
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src = (const struct freebsd11_dirent *)de11;
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dst = (struct dirent *)de;
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esrc = de11 + len11;
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edst = de + len;
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while ((const char *)src < esrc && (const char *)dst < edst) {
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rlen = roundup(offsetof(struct dirent, d_name) + src->d_namlen + 1, 8);
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if ((const char *)dst + rlen >= edst)
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break;
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dst->d_fileno = src->d_fileno;
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dst->d_off = 0; /* nothing uses it yet, so safe for now */
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dst->d_reclen = rlen;
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dst->d_type = src->d_type;
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dst->d_pad0 = 0;
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dst->d_namlen = src->d_namlen;
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dst->d_pad1 = 0;
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memset(dst->d_name, 0, roundup(src->d_namlen + 1, 8));
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memcpy(dst->d_name, src->d_name, src->d_namlen);
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dst = (struct dirent *)((char *)dst + rlen);
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src = (const struct freebsd11_dirent *)((const char *)src + src->d_reclen);
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}
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return ((char *)dst - de);
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}
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#undef getdirentries
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__weak_reference(_getdirentries, getdirentries);
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#pragma weak _getdirentries
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ssize_t
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_getdirentries(int fd, char *buf, size_t nbytes, off_t *basep)
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{
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char *oldbuf;
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size_t len;
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ssize_t rv;
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if (__getosreldate() >= INO64_FIRST)
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return (__sys_getdirentries(fd, buf, nbytes, basep));
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/*
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* Because the old system call returns entries that are smaller than the
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* new, we could wind up in a situation where we have too many to fit in
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* the buffer with the new encoding. So sacrifice a small bit of
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* efficiency to ensure that never happens. We pick 1/4 the size round
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* up to the next DIRBLKSIZ. This will guarnatee enough room exists in
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* the dst buffer due to changes in efficiency in packing dirent
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* entries. We don't check against minimum block size to avoid a lot of
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* stat calls, we'll see if that's wise or not.
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* TBD: Will this difference matter to lseek?
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*/
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len = roundup(nbytes / 4, DIRBLKSIZ);
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oldbuf = malloc(len);
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if (oldbuf == NULL) {
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errno = EINVAL; /* ENOMEM not in possible list */
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return (-1);
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}
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rv = syscall(SYS_freebsd11_getdirentries, fd, oldbuf, len, basep);
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if (rv == -1) {
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free(oldbuf);
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return (rv);
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}
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if (rv > 0)
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rv = __cvt_dirents_from11(oldbuf, rv, buf, nbytes);
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free(oldbuf);
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return (rv);
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}
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