readdir.c revision 1.2.2.2
1 1.2.2.2 jtc /* 2 1.2.2.2 jtc * Copyright (c) 1983, 1993 3 1.2.2.2 jtc * The Regents of the University of California. All rights reserved. 4 1.2.2.2 jtc * 5 1.2.2.2 jtc * Redistribution and use in source and binary forms, with or without 6 1.2.2.2 jtc * modification, are permitted provided that the following conditions 7 1.2.2.2 jtc * are met: 8 1.2.2.2 jtc * 1. Redistributions of source code must retain the above copyright 9 1.2.2.2 jtc * notice, this list of conditions and the following disclaimer. 10 1.2.2.2 jtc * 2. Redistributions in binary form must reproduce the above copyright 11 1.2.2.2 jtc * notice, this list of conditions and the following disclaimer in the 12 1.2.2.2 jtc * documentation and/or other materials provided with the distribution. 13 1.2.2.2 jtc * 3. All advertising materials mentioning features or use of this software 14 1.2.2.2 jtc * must display the following acknowledgement: 15 1.2.2.2 jtc * This product includes software developed by the University of 16 1.2.2.2 jtc * California, Berkeley and its contributors. 17 1.2.2.2 jtc * 4. Neither the name of the University nor the names of its contributors 18 1.2.2.2 jtc * may be used to endorse or promote products derived from this software 19 1.2.2.2 jtc * without specific prior written permission. 20 1.2.2.2 jtc * 21 1.2.2.2 jtc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.2.2.2 jtc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.2.2.2 jtc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.2.2.2 jtc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.2.2.2 jtc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.2.2.2 jtc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.2.2.2 jtc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.2.2.2 jtc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.2.2.2 jtc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.2.2.2 jtc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.2.2.2 jtc * SUCH DAMAGE. 32 1.2.2.2 jtc */ 33 1.2.2.2 jtc 34 1.2.2.2 jtc #if defined(LIBC_SCCS) && !defined(lint) 35 1.2.2.2 jtc /*static char sccsid[] = "from: @(#)readdir.c 8.1 (Berkeley) 6/4/93";*/ 36 1.2.2.2 jtc static char rcsid[] = "$Id: readdir.c,v 1.2.2.2 1994/07/27 14:39:49 jtc Exp $"; 37 1.2.2.2 jtc #endif /* LIBC_SCCS and not lint */ 38 1.2.2.2 jtc 39 1.2.2.2 jtc #include <sys/param.h> 40 1.2.2.2 jtc #include <dirent.h> 41 1.2.2.2 jtc 42 1.2.2.2 jtc /* 43 1.2.2.2 jtc * get next entry in a directory. 44 1.2.2.2 jtc */ 45 1.2.2.2 jtc struct dirent * 46 1.2.2.2 jtc readdir(dirp) 47 1.2.2.2 jtc register DIR *dirp; 48 1.2.2.2 jtc { 49 1.2.2.2 jtc register struct dirent *dp; 50 1.2.2.2 jtc 51 1.2.2.2 jtc for (;;) { 52 1.2.2.2 jtc if (dirp->dd_loc == 0) { 53 1.2.2.2 jtc dirp->dd_size = getdirentries(dirp->dd_fd, 54 1.2.2.2 jtc dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 55 1.2.2.2 jtc if (dirp->dd_size <= 0) 56 1.2.2.2 jtc return NULL; 57 1.2.2.2 jtc } 58 1.2.2.2 jtc if (dirp->dd_loc >= dirp->dd_size) { 59 1.2.2.2 jtc dirp->dd_loc = 0; 60 1.2.2.2 jtc continue; 61 1.2.2.2 jtc } 62 1.2.2.2 jtc dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 63 1.2.2.2 jtc if ((int)dp & 03) /* bogus pointer check */ 64 1.2.2.2 jtc return NULL; 65 1.2.2.2 jtc if (dp->d_reclen <= 0 || 66 1.2.2.2 jtc dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 67 1.2.2.2 jtc return NULL; 68 1.2.2.2 jtc dirp->dd_loc += dp->d_reclen; 69 1.2.2.2 jtc if (dp->d_ino == 0) 70 1.2.2.2 jtc continue; 71 1.2.2.2 jtc return (dp); 72 1.2.2.2 jtc } 73 1.2.2.2 jtc } 74
Indexes created Mon Sep 29 21:09:56 GMT 2025