From 3283f5bb5d843933b9c6070206c8a9b9846e7238 Mon Sep 17 00:00:00 2001
From: asynts <asynts@gmail.com>
Date: Wed, 16 Sep 2020 18:55:41 +0200
Subject: [PATCH] LibCore: Add find_executable_in_path.

---
 Libraries/LibCore/DirIterator.cpp | 20 ++++++++++++++++++++
 Libraries/LibCore/DirIterator.h   |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/Libraries/LibCore/DirIterator.cpp b/Libraries/LibCore/DirIterator.cpp
index 537b29eb8517db..3272e059212d27 100644
--- a/Libraries/LibCore/DirIterator.cpp
+++ b/Libraries/LibCore/DirIterator.cpp
@@ -25,6 +25,7 @@
  */
 
 #include <LibCore/DirIterator.h>
+#include <AK/Vector.h>
 #include <errno.h>
 
 namespace Core {
@@ -98,4 +99,23 @@ String DirIterator::next_full_path()
     return String::format("%s/%s", m_path.characters(), next_path().characters());
 }
 
+String find_executable_in_path(String filename)
+{
+    if (filename.starts_with('/')) {
+        if (access(filename.characters(), X_OK) == 0)
+            return filename;
+
+        return {};
+    }
+
+    for (auto directory : StringView { getenv("PATH") }.split_view(':')) {
+        auto fullpath = String::format("%s/%s", directory, filename);
+
+        if (access(fullpath.characters(), X_OK) == 0)
+            return fullpath;
+    }
+
+    return {};
+}
+
 }
diff --git a/Libraries/LibCore/DirIterator.h b/Libraries/LibCore/DirIterator.h
index b3a2c5a5bddbe8..7f423b4f173d5f 100644
--- a/Libraries/LibCore/DirIterator.h
+++ b/Libraries/LibCore/DirIterator.h
@@ -60,4 +60,6 @@ class DirIterator {
     bool advance_next();
 };
 
+String find_executable_in_path(String filename);
+
 }