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 <dirent.h> 42 #include <compat/include/dirent.h> 43 #include <string.h> 44 45 /* 46 * libc12 compatible getdents routine. 47 */ 48 int 49 getdents(int fd, char *buf, size_t nbytes) 50 { 51 struct dirent *ndp, *nndp, *endp; 52 struct dirent12 *odp; 53 ino_t ino; 54 int rv; 55 size_t len; 56 57 if ((rv = __getdents30(fd, buf, nbytes)) == -1) 58 return rv; 59 60 odp = (struct dirent12 *)(void *)buf; 61 ndp = (struct dirent *)(void *)buf; 62 endp = (struct dirent *)(void *)&buf[rv]; 63 64 /* 65 * In-place conversion. This works because odp 66 * is smaller than ndp, but it has to be done 67 * in the right sequence. 68 */ 69 for (; ndp < endp; ndp = nndp) { 70 nndp = _DIRENT_NEXT(ndp); 71 /* XXX: avoid unaligned 64-bit access on sparc64 */ 72 /* XXX: does this work? */ 73 memcpy(&ino, &ndp->d_ino, sizeof(ino_t)); 74 odp->d_ino = (uint32_t)ino; 75 if (ndp->d_namlen >= sizeof(odp->d_name)) 76 odp->d_namlen = sizeof(odp->d_name) - 1; 77 else 78 odp->d_namlen = (u_int8_t)ndp->d_namlen; 79 odp->d_type = ndp->d_type; 80 (void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen); 81 odp->d_name[odp->d_namlen] = '\0'; 82 len = _DIRENT_SIZE(odp); 83 _DIAGASSERT(__type_fit(uint16_t, len)); 84 odp->d_reclen = (uint16_t)len; 85 odp = _DIRENT_NEXT(odp); 86 } 87 ptrdiff_t td = (((char *)(void *)odp) - buf); 88 _DIAGASSERT(__type_fit(int, td)); 89 return (int)td; 90 } 91