ladybird/Userland/Utilities/env.cpp

/*
 * 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;
}