mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 17:42:43 +00:00
2b64d163cd
Problem: - `static` variables consume memory and sometimes are less optimizable. - `static const` variables can be `constexpr`, usually. - `static` function-local variables require an initialization check every time the function is run. Solution: - If a global `static` variable is only used in a single function then move it into the function and make it non-`static` and `constexpr`. - Make all global `static` variables `constexpr` instead of `const`. - Change function-local `static const[expr]` variables to be just `constexpr`.
94 lines
3.3 KiB
C++
94 lines
3.3 KiB
C++
/*
|
|
* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/String.h>
|
|
#include <AK/StringBuilder.h>
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
// FIXME
|
|
static constexpr char TEXT_FAIL[] = "\x1b[01;31m";
|
|
static constexpr char TEXT_PASS[] = "\x1b[01;32m";
|
|
static constexpr char TEXT_RESET[] = "\x1b[0m";
|
|
|
|
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 bool check_result(const char* what, const String& expected, const char* actual)
|
|
{
|
|
bool good = expected == actual;
|
|
printf("%s%s%s: %s = \"%s\" (%zu characters)\n", good ? TEXT_PASS : TEXT_FAIL, good ? "GOOD" : "FAIL", TEXT_RESET, what, actual, actual ? strlen(actual) : 0);
|
|
return good;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
// 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 = strdup("/tmp/overlong_realpath_XXXXXX");
|
|
if (!mkdtemp(tmp_dir)) {
|
|
perror("mkdtmp");
|
|
return 1;
|
|
}
|
|
if (chdir(tmp_dir) < 0) {
|
|
perror("chdir tmpdir");
|
|
return 1;
|
|
}
|
|
|
|
// Then, create a long path.
|
|
StringBuilder expected;
|
|
expected.append(tmp_dir);
|
|
|
|
// But first, demonstrate the functionality at a reasonable depth:
|
|
bool all_good = true;
|
|
auto expected_str = expected.build();
|
|
all_good &= check_result("getwd", expected_str, getwd(static_cast<char*>(calloc(1, PATH_MAX))));
|
|
all_good &= check_result("getcwd", expected_str, getcwd(nullptr, 0));
|
|
all_good &= check_result("realpath", expected_str, realpath(".", nullptr));
|
|
|
|
for (size_t i = 0; i < ITERATION_DEPTH; ++i) {
|
|
if (mkdir(PATH_LOREM_250, 0700) < 0) {
|
|
perror("mkdir iter");
|
|
printf("%sFAILED%s in iteration %zu.\n", TEXT_FAIL, TEXT_RESET, i);
|
|
return 1;
|
|
}
|
|
expected.append('/');
|
|
expected.append(PATH_LOREM_250);
|
|
if (chdir(PATH_LOREM_250) < 0) {
|
|
perror("chdir iter");
|
|
printf("%sFAILED%s in iteration %zu.\n", TEXT_FAIL, TEXT_RESET, i);
|
|
return 1;
|
|
}
|
|
}
|
|
printf("cwd should now be ridiculously large.\n");
|
|
|
|
// Evaluate
|
|
expected_str = expected.build();
|
|
|
|
all_good &= check_result("getwd", {}, getwd(static_cast<char*>(calloc(1, PATH_MAX))));
|
|
all_good &= check_result("getcwd", expected_str, getcwd(nullptr, 0));
|
|
all_good &= 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);
|
|
|
|
if (all_good) {
|
|
printf("Overall: %sPASS%s\n", TEXT_PASS, TEXT_RESET);
|
|
return 0;
|
|
} else {
|
|
printf("Overall: %sFAIL%s\n", TEXT_FAIL, TEXT_RESET);
|
|
return 2;
|
|
}
|
|
}
|