| 1 | /* Start reading the entries of a directory. |
| 2 | Copyright (C) 2006-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program 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 General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU 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 | #if HAVE_OPENDIR |
| 26 | |
| 27 | /* Override opendir(), to keep track of the open file descriptors. |
| 28 | Needed because there is a function dirfd(). */ |
| 29 | |
| 30 | #else |
| 31 | |
| 32 | # include <stdlib.h> |
| 33 | |
| 34 | # include "dirent-private.h" |
| 35 | # include "filename.h" |
| 36 | |
| 37 | #endif |
| 38 | |
| 39 | #if REPLACE_FCHDIR |
| 40 | # include <unistd.h> |
| 41 | #endif |
| 42 | |
| 43 | #ifdef __KLIBC__ |
| 44 | # include <io.h> |
| 45 | # include <fcntl.h> |
| 46 | #endif |
| 47 | |
| 48 | DIR * |
| 49 | opendir (const char *dir_name) |
| 50 | { |
| 51 | #if HAVE_OPENDIR |
| 52 | # undef opendir |
| 53 | DIR *dirp; |
| 54 | |
| 55 | dirp = opendir (dir_name); |
| 56 | if (dirp == NULL) |
| 57 | return NULL; |
| 58 | |
| 59 | # ifdef __KLIBC__ |
| 60 | { |
| 61 | int fd = open (dir_name, O_RDONLY); |
| 62 | if (fd == -1 || _gl_register_dirp_fd (fd, dirp)) |
| 63 | { |
| 64 | int saved_errno = errno; |
| 65 | |
| 66 | close (fd); |
| 67 | closedir (dirp); |
| 68 | |
| 69 | errno = saved_errno; |
| 70 | |
| 71 | return NULL; |
| 72 | } |
| 73 | } |
| 74 | # endif |
| 75 | #else |
| 76 | |
| 77 | char dir_name_mask[MAX_PATH + 1 + 1 + 1]; |
| 78 | int status; |
| 79 | HANDLE current; |
| 80 | WIN32_FIND_DATA entry; |
| 81 | struct gl_directory *dirp; |
| 82 | |
| 83 | if (dir_name[0] == '\0') |
| 84 | { |
| 85 | errno = ENOENT; |
| 86 | return NULL; |
| 87 | } |
| 88 | |
| 89 | /* Make the dir_name absolute, so that we continue reading the same |
| 90 | directory if the current directory changed between this opendir() |
| 91 | call and a subsequent rewinddir() call. */ |
| 92 | if (!GetFullPathName (dir_name, MAX_PATH, dir_name_mask, NULL)) |
| 93 | { |
| 94 | errno = EINVAL; |
| 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | /* Append the mask. |
| 99 | "*" and "*.*" appear to be equivalent. */ |
| 100 | { |
| 101 | char *p; |
| 102 | |
| 103 | p = dir_name_mask + strlen (dir_name_mask); |
| 104 | if (p > dir_name_mask && !ISSLASH (p[-1])) |
| 105 | *p++ = '\\'; |
| 106 | *p++ = '*'; |
| 107 | *p = '\0'; |
| 108 | } |
| 109 | |
| 110 | /* Start searching the directory. */ |
| 111 | status = -1; |
| 112 | current = FindFirstFile (dir_name_mask, &entry); |
| 113 | if (current == INVALID_HANDLE_VALUE) |
| 114 | { |
| 115 | switch (GetLastError ()) |
| 116 | { |
| 117 | case ERROR_FILE_NOT_FOUND: |
| 118 | status = -2; |
| 119 | break; |
| 120 | case ERROR_PATH_NOT_FOUND: |
| 121 | errno = ENOENT; |
| 122 | return NULL; |
| 123 | case ERROR_DIRECTORY: |
| 124 | errno = ENOTDIR; |
| 125 | return NULL; |
| 126 | case ERROR_ACCESS_DENIED: |
| 127 | errno = EACCES; |
| 128 | return NULL; |
| 129 | default: |
| 130 | errno = EIO; |
| 131 | return NULL; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /* Allocate the result. */ |
| 136 | dirp = |
| 137 | (struct gl_directory *) |
| 138 | malloc (offsetof (struct gl_directory, dir_name_mask[0]) |
| 139 | + strlen (dir_name_mask) + 1); |
| 140 | if (dirp == NULL) |
| 141 | { |
| 142 | if (current != INVALID_HANDLE_VALUE) |
| 143 | FindClose (current); |
| 144 | errno = ENOMEM; |
| 145 | return NULL; |
| 146 | } |
| 147 | dirp->status = status; |
| 148 | dirp->current = current; |
| 149 | if (status == -1) |
| 150 | memcpy (&dirp->entry, &entry, sizeof (WIN32_FIND_DATA)); |
| 151 | strcpy (dirp->dir_name_mask, dir_name_mask); |
| 152 | |
| 153 | #endif |
| 154 | |
| 155 | #if REPLACE_FCHDIR |
| 156 | { |
| 157 | int fd = dirfd (dirp); |
| 158 | if (0 <= fd && _gl_register_fd (fd, dir_name) != fd) |
| 159 | { |
| 160 | int saved_errno = errno; |
| 161 | closedir (dirp); |
| 162 | errno = saved_errno; |
| 163 | return NULL; |
| 164 | } |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | return dirp; |
| 169 | } |