1 files changed, 121 insertions, 0 deletions
diff --git a/Userland/Libraries/LibCore/DirIterator.cpp b/Userland/Libraries/LibCore/DirIterator.cpp
new file mode 100644
index 0000000000..3dbeecf24f
--- /dev/null
+++ b/Userland/Libraries/LibCore/DirIterator.cpp
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Vector.h>
+#include <LibCore/DirIterator.h>
+#include <errno.h>
+
+namespace Core {
+
+DirIterator::DirIterator(const StringView& path, Flags flags)
+    : m_path(path)
+    , m_flags(flags)
+{
+    m_dir = opendir(path.to_string().characters());
+    if (!m_dir) {
+        m_error = errno;
+    }
+}
+
+DirIterator::~DirIterator()
+{
+    if (m_dir) {
+        closedir(m_dir);
+        m_dir = nullptr;
+    }
+}
+
+bool DirIterator::advance_next()
+{
+    if (!m_dir)
+        return false;
+
+    while (true) {
+        errno = 0;
+        auto* de = readdir(m_dir);
+        if (!de) {
+            m_error = errno;
+            m_next = String();
+            return false;
+        }
+
+        m_next = de->d_name;
+        if (m_next.is_null())
+            return false;
+
+        if (m_flags & Flags::SkipDots && m_next.starts_with('.'))
+            continue;
+
+        if (m_flags & Flags::SkipParentAndBaseDir && (m_next == "." || m_next == ".."))
+            continue;
+
+        return !m_next.is_empty();
+    }
+}
+
+bool DirIterator::has_next()
+{
+    if (!m_next.is_null())
+        return true;
+
+    return advance_next();
+}
+
+String DirIterator::next_path()
+{
+    if (m_next.is_null())
+        advance_next();
+
+    auto tmp = m_next;
+    m_next = String();
+    return tmp;
+}
+
+String DirIterator::next_full_path()
+{
+    return String::formatted("{}/{}", m_path, next_path());
+}
+
+String find_executable_in_path(String filename)
+{
+    if (filename.starts_with('/')) {
+        if (access(filename.characters(), X_OK) == 0)
+            return filename;
+
+        return {};
+    }
+
+    for (auto directory : String { getenv("PATH") }.split(':')) {
+        auto fullpath = String::formatted("{}/{}", directory, filename);
+
+        if (access(fullpath.characters(), X_OK) == 0)
+            return fullpath;
+    }
+
+    return {};
+}
+
+}