1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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 /* Modified from newlib/libc/posix/readdir.c */ 35 36 #include <dirent.h> 37 #include <machine/syscall.h> 38 39 #define __NR___getdents64 __NR_getdents64 40 41 static _syscall3(int,__getdents64,int,fd,struct dirent64 *,dirp,unsigned int,count) 42 43 /* 44 * get next entry in a directory. 45 */ 46 struct dirent64 * 47 __readdir64 (dirp) 48 register DIR *dirp; { 49 register struct dirent64 *dp; 50 51 #ifdef HAVE_DD_LOCK 52 __lock_acquire_recursive(dirp->dd_lock); 53 #endif 54 55 if (dirp->dd_fd == -1) 56 return NULL; 57 58 for (;;) { 59 if (dirp->dd_loc == 0) { 60 dirp->dd_size = __getdents64 (dirp->dd_fd, 61 (void *)dirp->dd_buf, 62 dirp->dd_len); 63 64 if (dirp->dd_size <= 0) { 65 #ifdef HAVE_DD_LOCK 66 __lock_release_recursive(dirp->dd_lock); 67 #endif 68 return NULL; 69 } 70 } 71 if (dirp->dd_loc >= dirp->dd_size) { 72 dirp->dd_loc = 0; 73 continue; 74 } 75 dp = (struct dirent64 *)(dirp->dd_buf + dirp->dd_loc); 76 if ((int)dp & 03) { /* bogus pointer check */ 77 #ifdef HAVE_DD_LOCK 78 __lock_release_recursive(dirp->dd_lock); 79 #endif 80 return NULL; 81 } 82 if (dp->d_reclen <= 0 || 83 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { 84 #ifdef HAVE_DD_LOCK 85 __lock_release_recursive(dirp->dd_lock); 86 #endif 87 return NULL; 88 } 89 dirp->dd_loc += dp->d_reclen; 90 if (dp->d_ino == 0) 91 continue; 92 #ifdef HAVE_DD_LOCK 93 __lock_release_recursive(dirp->dd_lock); 94 #endif 95 return (dp); 96 } 97 } 98