1/* Read the next entry of a directory. 2 Copyright (C) 2011-2022 Free Software Foundation, Inc. 3 4 This file is free software: you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 2.1 of the 7 License, or (at your option) any later version. 8 9 This file is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17#include <config.h> 18 19/* Specification. */ 20#include <dirent.h> 21 22#include <errno.h> 23#include <stddef.h> 24 25#include "dirent-private.h" 26 27/* Don't assume that UNICODE is not defined. */ 28#undef FindNextFile 29#define FindNextFile FindNextFileA 30 31struct dirent * 32readdir (DIR *dirp) 33{ 34 char type; 35 struct dirent *result; 36 37 /* There is no need to add code to produce entries for "." and "..". 38 According to the POSIX:2008 section "4.12 Pathname Resolution" 39 <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html> 40 "." and ".." are syntactic entities. 41 POSIX also says: 42 "If entries for dot or dot-dot exist, one entry shall be returned 43 for dot and one entry shall be returned for dot-dot; otherwise, 44 they shall not be returned." */ 45 46 switch (dirp->status) 47 { 48 case -2: 49 /* End of directory already reached. */ 50 return NULL; 51 case -1: 52 break; 53 case 0: 54 if (!FindNextFile (dirp->current, &dirp->entry)) 55 { 56 switch (GetLastError ()) 57 { 58 case ERROR_NO_MORE_FILES: 59 dirp->status = -2; 60 return NULL; 61 default: 62 errno = EIO; 63 return NULL; 64 } 65 } 66 break; 67 default: 68 errno = dirp->status; 69 return NULL; 70 } 71 72 dirp->status = 0; 73 74 if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) 75 type = DT_DIR; 76 else if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) 77 type = DT_LNK; 78 else if ((dirp->entry.dwFileAttributes 79 & ~(FILE_ATTRIBUTE_READONLY 80 | FILE_ATTRIBUTE_HIDDEN 81 | FILE_ATTRIBUTE_SYSTEM 82 | FILE_ATTRIBUTE_ARCHIVE 83 | FILE_ATTRIBUTE_NORMAL 84 | FILE_ATTRIBUTE_TEMPORARY 85 | FILE_ATTRIBUTE_SPARSE_FILE 86 | FILE_ATTRIBUTE_COMPRESSED 87 | FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 88 | FILE_ATTRIBUTE_ENCRYPTED)) == 0) 89 /* Devices like COM1, LPT1, NUL would also have the attributes 0x20 but 90 they cannot occur here. */ 91 type = DT_REG; 92 else 93 type = DT_UNKNOWN; 94 95 /* Reuse the memory of dirp->entry for the result. */ 96 result = 97 (struct dirent *) 98 ((char *) dirp->entry.cFileName - offsetof (struct dirent, d_name[0])); 99 result->d_type = type; 100 101 return result; 102} 103