1/* $NetBSD: compat_getdents.c,v 1.5 2012/03/13 21:13:32 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34__RCSID("$NetBSD: compat_getdents.c,v 1.5 2012/03/13 21:13:32 christos Exp $"); 35#endif /* LIBC_SCCS and not lint */ 36 37#define __LIBC12_SOURCE__ 38 39#include "namespace.h" 40#include <sys/types.h> 41#include <assert.h> 42#include <dirent.h> 43#include <stddef.h> 44#include <compat/include/dirent.h> 45#include <string.h> 46 47/* 48 * libc12 compatible getdents routine. 49 */ 50int 51getdents(int fd, char *buf, size_t nbytes) 52{ 53 struct dirent *ndp, *nndp, *endp; 54 struct dirent12 *odp; 55 ino_t ino; 56 int rv; 57 size_t len; 58 59 if ((rv = __getdents30(fd, buf, nbytes)) == -1) 60 return rv; 61 62 odp = (struct dirent12 *)(void *)buf; 63 ndp = (struct dirent *)(void *)buf; 64 endp = (struct dirent *)(void *)&buf[rv]; 65 66 /* 67 * In-place conversion. This works because odp 68 * is smaller than ndp, but it has to be done 69 * in the right sequence. 70 */ 71 for (; ndp < endp; ndp = nndp) { 72 nndp = _DIRENT_NEXT(ndp); 73 /* XXX: avoid unaligned 64-bit access on sparc64 */ 74 /* XXX: does this work? */ 75 memcpy(&ino, &ndp->d_ino, sizeof(ino_t)); 76 odp->d_ino = (uint32_t)ino; 77 if (ndp->d_namlen >= sizeof(odp->d_name)) 78 odp->d_namlen = sizeof(odp->d_name) - 1; 79 else 80 odp->d_namlen = (u_int8_t)ndp->d_namlen; 81 odp->d_type = ndp->d_type; 82 (void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen); 83 odp->d_name[odp->d_namlen] = '\0'; 84 len = _DIRENT_SIZE(odp); 85 _DIAGASSERT(__type_fit(uint16_t, len)); 86 odp->d_reclen = (uint16_t)len; 87 odp = _DIRENT_NEXT(odp); 88 } 89 ptrdiff_t td = (((char *)(void *)odp) - buf); 90 _DIAGASSERT(__type_fit(int, td)); 91 return (int)td; 92} 93