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- /*
- * Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibTest/TestCase.h>
- #include <AK/String.h>
- #include <AK/StringBuilder.h>
- #include <errno.h>
- #include <limits.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/stat.h>
- #include <unistd.h>
- static constexpr char TMPDIR_PATTERN[] = "/tmp/overlong_realpath_XXXXXX";
- static constexpr char PATH_LOREM_250[] = "This-is-an-annoyingly-long-name-that-should-take-up-exactly-two-hundred-and-fifty-characters-and-is-surprisingly-difficult-to-fill-with-reasonably-meaningful-text-which-is-necessary-because-that-makes-it-easier-for-my-eyes-to-spot-any-corruption-fast";
- static constexpr size_t ITERATION_DEPTH = 17;
- static void check_result(char const* what, String const& expected, char const* actual)
- {
- if (expected != actual)
- FAIL(String::formatted("Expected {} to be \"{}\" ({} characters)", what, actual, actual ? strlen(actual) : 0));
- }
- TEST_CASE(overlong_realpath)
- {
- // We want to construct a path that is over PATH_MAX characters long.
- // This cannot be done in a single step.
- // First, switch to a known environment:
- char tmp_dir[] = "/tmp/overlong_realpath_XXXXXX";
- errno = 0;
- auto* new_dir = mkdtemp(tmp_dir);
- VERIFY(new_dir != nullptr);
- VERIFY(errno == 0);
- errno = 0;
- auto ret = chdir(tmp_dir);
- VERIFY(ret >= 0);
- VERIFY(errno == 0);
- // Then, create a long path.
- StringBuilder expected;
- expected.append({ tmp_dir, strlen(tmp_dir) });
- // But first, demonstrate the functionality at a reasonable depth:
- auto expected_str = expected.build();
- check_result("getwd", expected_str, getwd(static_cast<char*>(calloc(1, PATH_MAX))));
- check_result("getcwd", expected_str, getcwd(nullptr, 0));
- check_result("realpath", expected_str, realpath(".", nullptr));
- for (size_t i = 0; i < ITERATION_DEPTH; ++i) {
- ret = mkdir(PATH_LOREM_250, S_IRWXU);
- if (ret < 0) {
- perror("mkdir iter");
- FAIL(String::formatted("Unable to mkdir the overlong path fragment in iteration {}", i));
- return;
- }
- expected.append('/');
- expected.append({ PATH_LOREM_250, strlen(PATH_LOREM_250) });
- ret = chdir(PATH_LOREM_250);
- if (ret < 0) {
- perror("chdir iter");
- FAIL(String::formatted("Unable to chdir to the overlong path fragment in iteration {}", i));
- return;
- }
- }
- outln("cwd should now be ridiculously large");
- // Evaluate
- expected_str = expected.build();
- check_result("getwd", {}, getwd(static_cast<char*>(calloc(1, PATH_MAX))));
- check_result("getcwd", expected_str, getcwd(nullptr, 0));
- check_result("realpath", expected_str, realpath(".", nullptr));
- VERIFY(strlen(PATH_LOREM_250) == 250);
- VERIFY(strlen(TMPDIR_PATTERN) + ITERATION_DEPTH * (1 + strlen(PATH_LOREM_250)) == expected_str.length());
- VERIFY(expected_str.length() > PATH_MAX);
- }
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