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d711a486 | 1 | /** @file\r |
2 | Get next entry in a directory.\r | |
3 | \r | |
4 | Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Copyright (c) 1983, 1993\r | |
14 | The Regents of the University of California. All rights reserved.\r | |
15 | \r | |
16 | Redistribution and use in source and binary forms, with or without\r | |
17 | modification, are permitted provided that the following conditions\r | |
18 | are met:\r | |
19 | 1. Redistributions of source code must retain the above copyright\r | |
20 | notice, this list of conditions and the following disclaimer.\r | |
21 | 2. Redistributions in binary form must reproduce the above copyright\r | |
22 | notice, this list of conditions and the following disclaimer in the\r | |
23 | documentation and/or other materials provided with the distribution.\r | |
24 | 3. Neither the name of the University nor the names of its contributors\r | |
25 | may be used to endorse or promote products derived from this software\r | |
26 | without specific prior written permission.\r | |
27 | \r | |
28 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
29 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
30 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
31 | ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
32 | FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
33 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
34 | OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
35 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
36 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
37 | OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
38 | SUCH DAMAGE.\r | |
39 | \r | |
40 | NetBSD: readdir.c,v 1.24 2008/05/04 18:53:26 tonnerre Exp\r | |
41 | readdir.c 8.3 (Berkeley) 9/29/94\r | |
42 | */\r | |
43 | #include <sys/cdefs.h>\r | |
44 | \r | |
45 | #include <namespace.h>\r | |
46 | #include <reentrant.h>\r | |
47 | #include <extern.h>\r | |
48 | #include <sys/param.h>\r | |
49 | #include <sys/stdint.h>\r | |
50 | \r | |
51 | #include <stdio.h>\r | |
52 | #include <dirent.h>\r | |
53 | #include <errno.h>\r | |
54 | #include <string.h>\r | |
55 | #include <unistd.h>\r | |
56 | \r | |
57 | #include <sys/EfiSysCall.h>\r | |
58 | \r | |
59 | /*\r | |
60 | * get next entry in a directory.\r | |
61 | */\r | |
62 | struct dirent *\r | |
63 | _readdir_unlocked(DIR *dirp, int skipdeleted)\r | |
64 | {\r | |
65 | struct dirent *dp;\r | |
66 | \r | |
67 | \r | |
68 | for (;;) {\r | |
69 | if (dirp->dd_loc >= dirp->dd_size) {\r | |
70 | if (dirp->dd_flags & __DTF_READALL)\r | |
71 | return (NULL);\r | |
72 | dirp->dd_loc = 0;\r | |
73 | }\r | |
74 | if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {\r | |
75 | dirp->dd_size = (long)read(dirp->dd_fd, dirp->dd_buf, (size_t)dirp->dd_len);\r | |
76 | if (dirp->dd_size <= 0)\r | |
77 | return (NULL);\r | |
78 | }\r | |
79 | dp = (struct dirent *) (void *)(dirp->dd_buf + (size_t)dirp->dd_loc);\r | |
80 | if ((intptr_t)dp & _DIRENT_ALIGN(dp))/* bogus pointer check */\r | |
81 | return (NULL);\r | |
82 | dirp->dd_loc += (long)dp->Size;\r | |
83 | if ((dp->Attribute & DT_HIDDEN) && (dirp->dd_flags & DTF_HIDEW))\r | |
84 | continue;\r | |
85 | return (dp);\r | |
86 | }\r | |
87 | }\r | |
88 | \r | |
89 | struct dirent *\r | |
90 | readdir(DIR *dirp)\r | |
91 | {\r | |
92 | struct dirent *dp;\r | |
93 | \r | |
94 | #ifdef _REENTRANT\r | |
95 | if (__isthreaded) {\r | |
96 | mutex_lock((mutex_t *)dirp->dd_lock);\r | |
97 | dp = _readdir_unlocked(dirp, 1);\r | |
98 | mutex_unlock((mutex_t *)dirp->dd_lock);\r | |
99 | }\r | |
100 | else\r | |
101 | #endif\r | |
102 | dp = _readdir_unlocked(dirp, 1);\r | |
103 | return (dp);\r | |
104 | }\r | |
105 | \r | |
106 | int\r | |
107 | readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)\r | |
108 | {\r | |
109 | struct dirent *dp;\r | |
110 | int saved_errno;\r | |
111 | \r | |
112 | saved_errno = errno;\r | |
113 | errno = 0;\r | |
114 | #ifdef _REENTRANT\r | |
115 | if (__isthreaded) {\r | |
116 | mutex_lock((mutex_t *)dirp->dd_lock);\r | |
117 | if ((dp = _readdir_unlocked(dirp, 1)) != NULL)\r | |
118 | memcpy(entry, dp, (size_t)_DIRENT_SIZE(dp));\r | |
119 | mutex_unlock((mutex_t *)dirp->dd_lock);\r | |
120 | }\r | |
121 | else\r | |
122 | #endif\r | |
123 | if ((dp = _readdir_unlocked(dirp, 1)) != NULL)\r | |
124 | memcpy(entry, dp, (size_t)_DIRENT_SIZE(dp));\r | |
125 | \r | |
126 | if (errno != 0) {\r | |
127 | if (dp == NULL)\r | |
128 | return (errno);\r | |
129 | } else\r | |
130 | errno = saved_errno;\r | |
131 | \r | |
132 | if (dp != NULL)\r | |
133 | *result = entry;\r | |
134 | else\r | |
135 | *result = NULL;\r | |
136 | \r | |
137 | return (0);\r | |
138 | }\r |