1 /* $NetBSD: compat_getdents.c,v 1.2 2007/03/02 13:18:55 nakayama 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: compat_getdents.c,v 1.2 2007/03/02 13:18:55 nakayama Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #define __LIBC12_SOURCE__ 45 46 #include "namespace.h" 47 #include <sys/types.h> 48 #include <dirent.h> 49 #include <compat/include/dirent.h> 50 #include <string.h> 51 52 /* 53 * libc12 compatible getdents routine. 54 */ 55 int 56 getdents(int fd, char *buf, size_t nbytes) 57 { 58 struct dirent *ndp, *nndp, *endp; 59 struct dirent12 *odp; 60 int rv; 61 62 if ((rv = __getdents30(fd, buf, nbytes)) == -1) 63 return rv; 64 65 odp = (struct dirent12 *)(void *)buf; 66 ndp = (struct dirent *)(void *)buf; 67 endp = (struct dirent *)(void *)&buf[rv]; 68 69 /* 70 * In-place conversion. This works because odp 71 * is smaller than ndp, but it has to be done 72 * in the right sequence. 73 */ 74 for (; ndp < endp; ndp = nndp) { 75 nndp = _DIRENT_NEXT(ndp); 76 /* XXX: avoid unaligned 64-bit access on sparc64 */ 77 odp->d_ino = ((u_int32_t *)(void *)&ndp->d_ino)[_QUAD_LOWWORD]; 78 if (ndp->d_namlen >= sizeof(odp->d_name)) 79 odp->d_namlen = sizeof(odp->d_name) - 1; 80 else 81 odp->d_namlen = (u_int8_t)ndp->d_namlen; 82 odp->d_type = ndp->d_type; 83 (void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen); 84 odp->d_name[odp->d_namlen] = '\0'; 85 odp->d_reclen = _DIRENT_SIZE(odp); 86 odp = _DIRENT_NEXT(odp); 87 } 88 return ((char *)(void *)odp) - buf; 89 } 90