Userland: Move command-line utilities to Userland/Utilities/

Userland/Utilities/env.cpp

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * 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 <LibCore/DirIterator.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+    if (pledge("stdio rpath exec", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    const char* filename = nullptr;
+
+    for (int idx = 1; idx < argc; ++idx) {
+        if (idx == 1) {
+            if (StringView { argv[idx] } == "-i" || StringView { argv[idx] } == "--ignore-environment") {
+                clearenv();
+                continue;
+            }
+        }
+        if (StringView { argv[idx] }.contains('=')) {
+            putenv(argv[idx]);
+        } else {
+            filename = argv[idx];
+            argv += idx;
+            break;
+        }
+    }
+
+    if (filename == nullptr) {
+        for (auto entry = environ; *entry != nullptr; ++entry)
+            printf("%s\n", *entry);
+
+        return 0;
+    }
+
+    String filepath = Core::find_executable_in_path(filename);
+
+    if (filepath.is_null()) {
+        warnln("no {} in path", filename);
+        return 1;
+    }
+
+    execv(filepath.characters(), argv);
+
+    perror("execv");
+    return 1;
+}