jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <LibCore/DirIterator.h>
28#include <errno.h>
29
30namespace Core {
31
32DirIterator::DirIterator(const StringView& path, Flags flags)
33 : m_path(path)
34 , m_flags(flags)
35{
36 m_dir = opendir(String(path).characters());
37 if (!m_dir) {
38 m_error = errno;
39 }
40}
41
42DirIterator::~DirIterator()
43{
44 if (m_dir) {
45 closedir(m_dir);
46 m_dir = nullptr;
47 }
48}
49
50bool DirIterator::advance_next()
51{
52 if (!m_dir)
53 return false;
54
55 while (true) {
56 errno = 0;
57 auto* de = readdir(m_dir);
58 if (!de) {
59 m_error = errno;
60 m_next = String();
61 return false;
62 }
63
64 m_next = de->d_name;
65 if (m_next.is_null())
66 return false;
67
68 if (m_flags & Flags::SkipDots && m_next.starts_with('.'))
69 continue;
70
71 if (m_flags & Flags::SkipParentAndBaseDir && (m_next == "." || m_next == ".."))
72 continue;
73
74 return !m_next.is_empty();
75 }
76}
77
78bool DirIterator::has_next()
79{
80 if (!m_next.is_null())
81 return true;
82
83 return advance_next();
84}
85
86String DirIterator::next_path()
87{
88 if (m_next.is_null())
89 advance_next();
90
91 auto tmp = m_next;
92 m_next = String();
93 return tmp;
94}
95
96String DirIterator::next_full_path()
97{
98 return String::format("%s/%s", m_path.characters(), next_path().characters());
99}
100
101}