1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char sccsid[] = "from: @(#)readdir.c 8.1 (Berkeley) 6/4/93";*/ 36 static char rcsid[] = "$Id: readdir.c,v 1.2 1994/07/27 14:39:48 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/param.h> 40 #include <dirent.h> 41 42 /* 43 * get next entry in a directory. 44 */ 45 struct dirent * 46 readdir(dirp) 47 register DIR *dirp; 48 { 49 register struct dirent *dp; 50 51 for (;;) { 52 if (dirp->dd_loc == 0) { 53 dirp->dd_size = getdirentries(dirp->dd_fd, 54 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 55 if (dirp->dd_size <= 0) 56 return NULL; 57 } 58 if (dirp->dd_loc >= dirp->dd_size) { 59 dirp->dd_loc = 0; 60 continue; 61 } 62 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 63 if ((int)dp & 03) /* bogus pointer check */ 64 return NULL; 65 if (dp->d_reclen <= 0 || 66 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 67 return NULL; 68 dirp->dd_loc += dp->d_reclen; 69 if (dp->d_ino == 0) 70 continue; 71 return (dp); 72 } 73 } 74