1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 /*LINTLIBRARY*/ 41 42 /* 43 * readdir -- C library extension routine 44 */ 45 46 #include <sys/types.h> 47 #include <sys/dir.h> 48 #include <sys/dirent.h> 49 #include <limits.h> 50 #include <string.h> 51 #include <errno.h> 52 #include "libc.h" 53 54 static struct direct dc; 55 static struct direct64 dc64; 56 57 static struct direct64 * 58 internal_readdir(DIR *dirp) 59 { 60 struct dirent64 *dp; /* -> directory data */ 61 int saveloc = 0; 62 63 if (dirp->dd_size != 0) { 64 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc]; 65 saveloc = dirp->dd_loc; /* save for possible EOF */ 66 dirp->dd_loc += dp->d_reclen; 67 } 68 if (dirp->dd_loc >= dirp->dd_size) 69 dirp->dd_loc = dirp->dd_size = 0; 70 71 if (dirp->dd_size == 0 && /* refill buffer */ 72 (dirp->dd_size = getdents64(dirp->dd_fd, 73 (struct dirent64 *)dirp->dd_buf, DIRBUF)) <= 0) { 74 if (dirp->dd_size == 0) /* This means EOF */ 75 dirp->dd_loc = saveloc; /* EOF so save for telldir */ 76 return (NULL); /* error or EOF */ 77 } 78 79 dp = (struct dirent64 *)&dirp->dd_buf[dirp->dd_loc]; 80 81 /* Copy dirent into direct */ 82 dc64.d_ino = dp->d_ino; 83 dc64.d_reclen = dp->d_reclen; 84 dc64.d_namlen = (ushort_t)strlen(dp->d_name); 85 if (dc64.d_namlen > MAXNAMLEN) { 86 errno = ENAMETOOLONG; 87 return (NULL); 88 } 89 (void) strcpy(dc64.d_name, dp->d_name); 90 91 return (&dc64); 92 } 93 94 struct direct * 95 readdir(DIR *dirp) 96 { 97 if (internal_readdir(dirp) == NULL) 98 return (NULL); 99 100 /* Check for overflows */ 101 if (dc64.d_ino > SIZE_MAX) { 102 errno = EOVERFLOW; 103 return (NULL); 104 } 105 106 /* Copy dirent into direct */ 107 dc.d_ino = dc64.d_ino; 108 dc.d_reclen = dc64.d_reclen - 4; 109 dc.d_namlen = dc64.d_namlen; 110 (void) strcpy(dc.d_name, dc64.d_name); 111 112 return (&dc); 113 } 114 115 #if !defined(_LP64) 116 struct direct64 * 117 readdir64(DIR *dirp) 118 { 119 return (internal_readdir(dirp)); 120 } 121 #endif 122