1 /* $NetBSD: readdir.c,v 1.5 1995/02/25 08:51:35 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94"; 39 #else 40 static char rcsid[] = "$NetBSD: readdir.c,v 1.5 1995/02/25 08:51:35 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/param.h> 45 #include <dirent.h> 46 47 /* 48 * get next entry in a directory. 49 */ 50 struct dirent * 51 readdir(dirp) 52 register DIR *dirp; 53 { 54 register struct dirent *dp; 55 56 for (;;) { 57 if (dirp->dd_loc >= dirp->dd_size) { 58 if (dirp->dd_flags & __DTF_READALL) 59 return (NULL); 60 dirp->dd_loc = 0; 61 } 62 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) { 63 dirp->dd_size = getdirentries(dirp->dd_fd, 64 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 65 if (dirp->dd_size <= 0) 66 return (NULL); 67 } 68 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 69 if ((long)dp & 03) /* bogus pointer check */ 70 return (NULL); 71 if (dp->d_reclen <= 0 || 72 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 73 return (NULL); 74 dirp->dd_loc += dp->d_reclen; 75 if (dp->d_ino == 0) 76 continue; 77 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 78 continue; 79 return (dp); 80 } 81 } 82