kernel - Handle spinlock indefinite wait edge case
[dragonfly.git] / contrib / grep / lib / readdir.c
blob8646aac43bdb5a924aebfeeb8d3cf5cc90a0f7a2
1 /* Read the next entry of a directory.
2 Copyright (C) 2011-2015 Free Software Foundation, Inc.
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.
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.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 #include <config.h>
19 /* Specification. */
20 #include <dirent.h>
22 #include <errno.h>
23 #include <stddef.h>
25 #include "dirent-private.h"
27 struct dirent *
28 readdir (DIR *dirp)
30 char type;
31 struct dirent *result;
33 /* There is no need to add code to produce entries for "." and "..".
34 According to the POSIX:2008 section "4.12 Pathname Resolution"
35 <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html>
36 "." and ".." are syntactic entities.
37 POSIX also says:
38 "If entries for dot or dot-dot exist, one entry shall be returned
39 for dot and one entry shall be returned for dot-dot; otherwise,
40 they shall not be returned." */
42 switch (dirp->status)
44 case -2:
45 /* End of directory already reached. */
46 return NULL;
47 case -1:
48 break;
49 case 0:
50 if (!FindNextFile (dirp->current, &dirp->entry))
52 switch (GetLastError ())
54 case ERROR_NO_MORE_FILES:
55 dirp->status = -2;
56 return NULL;
57 default:
58 errno = EIO;
59 return NULL;
62 break;
63 default:
64 errno = dirp->status;
65 return NULL;
68 dirp->status = 0;
70 if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
71 type = DT_DIR;
72 else if (dirp->entry.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
73 type = DT_LNK;
74 else if ((dirp->entry.dwFileAttributes
75 & ~(FILE_ATTRIBUTE_READONLY
76 | FILE_ATTRIBUTE_HIDDEN
77 | FILE_ATTRIBUTE_SYSTEM
78 | FILE_ATTRIBUTE_ARCHIVE
79 | FILE_ATTRIBUTE_NORMAL
80 | FILE_ATTRIBUTE_TEMPORARY
81 | FILE_ATTRIBUTE_SPARSE_FILE
82 | FILE_ATTRIBUTE_COMPRESSED
83 | FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
84 | FILE_ATTRIBUTE_ENCRYPTED)) == 0)
85 /* Devices like COM1, LPT1, NUL would also have the attributes 0x20 but
86 they cannot occur here. */
87 type = DT_REG;
88 else
89 type = DT_UNKNOWN;
91 /* Reuse the memory of dirp->entry for the result. */
92 result =
93 (struct dirent *)
94 ((char *) dirp->entry.cFileName - offsetof (struct dirent, d_name[0]));
95 result->d_type = type;
97 return result;