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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 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 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 /* 43 * readdir -- C library extension routine 44 */ 45 46 #include <sys/feature_tests.h> 47 48 #if !defined(_LP64) 49 #pragma weak readdir64 = _readdir64 50 #endif 51 #pragma weak readdir = _readdir 52 53 #include "synonyms.h" 54 #include <sys/types.h> 55 #include <sys/dirent.h> 56 #include <dirent.h> 57 #include <limits.h> 58 #include <errno.h> 59 #include "libc.h" 60 61 #ifdef _LP64 62 63 struct dirent * 64 readdir(DIR *dirp) 65 { 66 struct dirent *dp; /* -> directory data */ 67 int saveloc = 0; 68 69 if (dirp->dd_size != 0) { 70 dp = (struct dirent *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 71 saveloc = dirp->dd_loc; /* save for possible EOF */ 72 dirp->dd_loc += (int)dp->d_reclen; 73 } 74 if (dirp->dd_loc >= dirp->dd_size) 75 dirp->dd_loc = dirp->dd_size = 0; 76 77 if (dirp->dd_size == 0 && /* refill buffer */ 78 (dirp->dd_size = getdents(dirp->dd_fd, 79 (struct dirent *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) { 80 if (dirp->dd_size == 0) /* This means EOF */ 81 dirp->dd_loc = saveloc; /* EOF so save for */ 82 /* telldir */ 83 return (NULL); /* error or EOF */ 84 } 85 86 return ((struct dirent *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]); 87 } 88 89 #else /* _LP64 */ 90 91 /* 92 * Welcome to the complicated world of large files on a small system. 93 */ 94 95 struct dirent64 * 96 readdir64(DIR *dirp) 97 { 98 struct dirent64 *dp64; /* -> directory data */ 99 int saveloc = 0; 100 101 if (dirp->dd_size != 0) { 102 dp64 = (struct dirent64 *) 103 (uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 104 /* was converted by readdir and needs to be reversed */ 105 if (dp64->d_ino == (ino64_t)-1) { 106 struct dirent *dp32; 107 108 dp32 = (struct dirent *)(&dp64->d_off); 109 dp64->d_ino = (ino64_t)dp32->d_ino; 110 dp64->d_off = (off64_t)dp32->d_off; 111 dp64->d_reclen = (unsigned short)(dp32->d_reclen + 112 ((char *)&dp64->d_off - (char *)dp64)); 113 } 114 saveloc = dirp->dd_loc; /* save for possible EOF */ 115 dirp->dd_loc += (int)dp64->d_reclen; 116 } 117 if (dirp->dd_loc >= dirp->dd_size) 118 dirp->dd_loc = dirp->dd_size = 0; 119 120 if (dirp->dd_size == 0 && /* refill buffer */ 121 (dirp->dd_size = getdents64(dirp->dd_fd, 122 (struct dirent64 *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) { 123 if (dirp->dd_size == 0) /* This means EOF */ 124 dirp->dd_loc = saveloc; /* EOF so save for */ 125 /* telldir */ 126 return (NULL); /* error or EOF */ 127 } 128 129 dp64 = (struct dirent64 *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 130 return (dp64); 131 } 132 133 /* 134 * readdir now does translation of dirent64 entries into dirent entries. 135 * We rely on the fact that dirents are smaller than dirent64s and we 136 * reuse the space accordingly. 137 */ 138 struct dirent * 139 readdir(DIR *dirp) 140 { 141 struct dirent64 *dp64; /* -> directory data */ 142 struct dirent *dp32; /* -> directory data */ 143 144 if ((dp64 = readdir64(dirp)) == NULL) 145 return (NULL); 146 147 /* 148 * Make sure that the offset fits in 32 bits. 149 */ 150 if (((off_t)dp64->d_off != dp64->d_off && 151 (uint64_t)dp64->d_off > (uint64_t)UINT32_MAX) || 152 (dp64->d_ino > SIZE_MAX)) { 153 errno = EOVERFLOW; 154 return (NULL); 155 } 156 157 dp32 = (struct dirent *)(&dp64->d_off); 158 dp32->d_off = (off_t)dp64->d_off; 159 dp32->d_ino = (ino_t)dp64->d_ino; 160 dp32->d_reclen = (unsigned short)(dp64->d_reclen - 161 ((char *)&dp64->d_off - (char *)dp64)); 162 dp64->d_ino = (ino64_t)-1; /* flag as converted for readdir64 */ 163 /* d_name d_reclen should not move */ 164 return (dp32); 165 } 166 #endif /* _LP64 */ 167