Fix std::filesystem

This change makes a second pass, at fixing the errno issue with libcxx's
filesystem code. Previously, 89.01% of LLVM's test suite was passing and
now 98.59% of their tests pass. Best of all, it's now possible for Clang
to be built as a working APE binary that can to compile the Cosmopolitan
repository. Please note it has only been vetted so far for some objects,
and more work would obviously need to be done in cosmo, to fix warnings.

test/libcxx/errc_test.cc

@@ -0,0 +1,22 @@
+#include <cerrno>
+#include <system_error>
+
+bool test_errc_mapping(int posix_error, std::errc expected_errc) {
+  std::error_code ec(posix_error, std::generic_category());
+  return ec.value() == posix_error &&  //
+         std::error_condition(expected_errc) == ec;
+}
+
+int main() {
+  if (!test_errc_mapping(EACCES, std::errc::permission_denied))
+    return 1;
+  if (!test_errc_mapping(ENOENT, std::errc::no_such_file_or_directory))
+    return 2;
+  if (!test_errc_mapping(EEXIST, std::errc::file_exists))
+    return 3;
+  if (!test_errc_mapping(EINVAL, std::errc::invalid_argument))
+    return 4;
+  if (!test_errc_mapping(ENOSPC, std::errc::no_space_on_device))
+    return 5;
+  return 0;
+}

test/libcxx/filesystem_test.cc

@@ -0,0 +1,341 @@
+#include <chrono>
+#include <cstdio>
+#include <filesystem>
+#include <fstream>
+#include <random>
+#include <string>
+#include <thread>
+
+#define ASSERT(condition)                                           \
+  if (!(condition)) {                                               \
+    fprintf(stderr, "%s:%d: test failed: %s\n", __FILE__, __LINE__, \
+            #condition);                                            \
+    return 1;                                                       \
+  }
+
+namespace fs = std::filesystem;
+
+fs::path g_temp_path;
+fs::path g_orig_path;
+std::string g_tmpdir;
+
+void setup() {
+  g_orig_path = fs::current_path();
+  fs::path temp_path = fs::temp_directory_path();
+  auto now = std::chrono::system_clock::now();
+  auto now_ms = std::chrono::time_point_cast<std::chrono::milliseconds>(now);
+  auto value = now_ms.time_since_epoch();
+  long duration = value.count();
+  std::random_device rd;
+  std::mt19937 gen(rd());
+  std::uniform_int_distribution<> dis(0, 999999);
+  int random_number = dis(gen);
+  std::string dir_name =
+      "temp_" + std::to_string(duration) + "_" + std::to_string(random_number);
+  g_temp_path = temp_path / dir_name;
+  fs::create_directory(g_temp_path);
+  fs::current_path(g_temp_path);
+  fs::create_directory("tmp");
+  g_tmpdir = fs::absolute("tmp");
+  setenv("TMPDIR", g_tmpdir.c_str(), true);
+}
+
+void teardown() {
+  fs::current_path(g_orig_path);
+  fs::remove_all(g_temp_path);
+}
+
+int test_create_directory() {
+  fs::path dir = "test_dir";
+  ASSERT(fs::create_directory(dir));
+  ASSERT(fs::is_directory(dir));
+  ASSERT(!fs::create_directory(dir));
+  fs::remove(dir);
+  return 0;
+}
+
+int test_create_directories() {
+  fs::path dirs = "test_dir/nested/deep";
+  ASSERT(fs::create_directories(dirs));
+  ASSERT(fs::is_directory(dirs));
+  ASSERT(!fs::create_directories(dirs));
+  fs::remove_all("test_dir");
+  return 0;
+}
+
+int test_remove() {
+  fs::path file = "test_file.txt";
+  std::ofstream(file).put('a');
+  ASSERT(fs::remove(file));
+  ASSERT(!fs::remove(file));
+  return 0;
+}
+
+int test_remove_all() {
+  fs::path dir = "test_dir/nested/deep";
+  fs::create_directories(dir);
+  ASSERT(fs::remove_all("test_dir") > 0);
+  ASSERT(fs::remove_all("test_dir") == 0);
+  return 0;
+}
+
+int test_rename() {
+  fs::path old_name = "old.txt";
+  fs::path new_name = "new.txt";
+  std::ofstream(old_name).put('a');
+  fs::rename(old_name, new_name);
+  ASSERT(!fs::exists(old_name));
+  ASSERT(fs::exists(new_name));
+  fs::remove(new_name);
+  return 0;
+}
+
+int test_copy() {
+  fs::path src = "src.txt";
+  fs::path dst = "dst.txt";
+  std::ofstream(src) << "test";
+  fs::copy(src, dst);
+  ASSERT(fs::exists(dst));
+  ASSERT(fs::file_size(src) == fs::file_size(dst));
+  fs::remove(src);
+  fs::remove(dst);
+  return 0;
+}
+
+int test_copy_file() {
+  fs::path src = "src.txt";
+  fs::path dst = "dst.txt";
+  std::ofstream(src) << "test";
+  ASSERT(fs::copy_file(src, dst));
+  ASSERT(!fs::copy_file(src, dst, fs::copy_options::skip_existing));
+  fs::remove(src);
+  fs::remove(dst);
+  return 0;
+}
+
+int test_exists() {
+  fs::path file = "test.txt";
+  ASSERT(!fs::exists(file));
+  std::ofstream(file).put('a');
+  ASSERT(fs::exists(file));
+  fs::remove(file);
+  return 0;
+}
+
+int test_is_regular_file() {
+  fs::path file = "test.txt";
+  fs::path dir = "test_dir";
+  std::ofstream(file).put('a');
+  fs::create_directory(dir);
+  ASSERT(fs::is_regular_file(file));
+  ASSERT(!fs::is_regular_file(dir));
+  fs::remove(file);
+  fs::remove(dir);
+  return 0;
+}
+
+int test_is_directory() {
+  fs::path file = "test.txt";
+  fs::path dir = "test_dir";
+  std::ofstream(file).put('a');
+  fs::create_directory(dir);
+  ASSERT(!fs::is_directory(file));
+  ASSERT(fs::is_directory(dir));
+  fs::remove(file);
+  fs::remove(dir);
+  return 0;
+}
+
+int test_is_symlink() {
+  fs::path file = "test.txt";
+  fs::path link = "test_link";
+  std::ofstream(file).put('a');
+  fs::create_symlink(file, link);
+  ASSERT(!fs::is_symlink(file));
+  ASSERT(fs::is_symlink(link));
+  fs::remove(file);
+  fs::remove(link);
+  return 0;
+}
+
+int test_file_size() {
+  fs::path file = "test.txt";
+  std::ofstream(file) << "test";
+  ASSERT(fs::file_size(file) == 4);
+  fs::remove(file);
+  return 0;
+}
+
+int test_last_write_time() {
+  fs::path file = "test.txt";
+  auto now = fs::file_time_type::clock::now();
+  std::ofstream(file).put('a');
+  fs::last_write_time(file, now);
+  ASSERT(fs::last_write_time(file) == now);
+  fs::remove(file);
+  return 0;
+}
+
+int test_permissions() {
+  fs::path file = "test.txt";
+  std::ofstream(file).put('a');
+  fs::permissions(file, fs::perms::owner_read | fs::perms::owner_write);
+  auto perms = fs::status(file).permissions();
+  ASSERT((perms & fs::perms::owner_read) != fs::perms::none);
+  ASSERT((perms & fs::perms::owner_write) != fs::perms::none);
+  ASSERT((perms & fs::perms::owner_exec) == fs::perms::none);
+  fs::remove(file);
+  return 0;
+}
+
+int test_current_path() {
+  auto original_path = fs::current_path();
+  fs::path new_path = fs::temp_directory_path();
+  fs::current_path(new_path);
+  ASSERT(fs::current_path() == new_path);
+  fs::current_path(original_path);
+  return 0;
+}
+
+int test_absolute() {
+  fs::path relative = "test.txt";
+  auto abs_path = fs::absolute(relative);
+  ASSERT(abs_path.is_absolute());
+  return 0;
+}
+
+int test_canonical() {
+  fs::path dir = "test_dir";
+  fs::path file = dir / "test.txt";
+  fs::create_directories(dir);
+  std::ofstream(file).put('a');
+  auto can_path = fs::canonical(file);
+  ASSERT(can_path.is_absolute());
+  ASSERT(!can_path.lexically_normal().string().empty());
+  fs::remove_all(dir);
+  return 0;
+}
+
+int test_read_symlink() {
+  fs::path file = "test.txt";
+  fs::path link = "test_link";
+  std::ofstream(file).put('a');
+  fs::create_symlink(file, link);
+  ASSERT(fs::read_symlink(link) == file);
+  fs::remove(file);
+  fs::remove(link);
+  return 0;
+}
+
+int test_create_symlink_and_hard_link() {
+  fs::path file = "test.txt";
+  fs::path symlink = "test_symlink";
+  fs::path hardlink = "test_hardlink";
+  std::ofstream(file).put('a');
+  fs::create_symlink(file, symlink);
+  fs::create_hard_link(file, hardlink);
+  ASSERT(fs::exists(symlink));
+  ASSERT(fs::exists(hardlink));
+  ASSERT(fs::is_symlink(symlink));
+  ASSERT(!fs::is_symlink(hardlink));
+  fs::remove(file);
+  fs::remove(symlink);
+  fs::remove(hardlink);
+  return 0;
+}
+
+int test_space() {
+  auto space_info = fs::space(".");
+  ASSERT(space_info.capacity > 0);
+  ASSERT(space_info.free > 0);
+  ASSERT(space_info.available > 0);
+  return 0;
+}
+
+int test_equivalent() {
+  fs::path file1 = "test1.txt";
+  fs::path file2 = "test2.txt";
+  std::ofstream(file1).put('a');
+  fs::create_hard_link(file1, file2);
+  ASSERT(fs::equivalent(file1, file2));
+  fs::remove(file1);
+  fs::remove(file2);
+  return 0;
+}
+
+int test_resize_file() {
+  fs::path file = "test.txt";
+  std::ofstream(file) << "test";
+  fs::resize_file(file, 10);
+  ASSERT(fs::file_size(file) == 10);
+  fs::remove(file);
+  return 0;
+}
+
+int test_status() {
+  fs::path file = "test.txt";
+  std::ofstream(file).put('a');
+  auto status = fs::status(file);
+  ASSERT(status.type() == fs::file_type::regular);
+  fs::remove(file);
+  return 0;
+}
+
+int test_copy_enoent() {
+  fs::path src = "non_existent_file.txt";
+  fs::path dst = "destination.txt";
+  try {
+    fs::copy(src, dst);
+    ASSERT(false);
+  } catch (const fs::filesystem_error& e) {
+    if (e.code() == std::errc::no_such_file_or_directory) {
+      return 0;
+    } else {
+      ASSERT(false);
+    }
+  } catch (const std::exception& e) {
+    ASSERT(false);
+  }
+}
+
+#define RUN(func)  \
+  result = func(); \
+  if (result)      \
+  return result
+
+int test() {
+  int result = 0;
+  RUN(test_copy_enoent);
+  RUN(test_create_directory);
+  RUN(test_create_directories);
+  RUN(test_remove);
+  RUN(test_remove_all);
+  RUN(test_rename);
+  RUN(test_copy);
+  RUN(test_copy_file);
+  RUN(test_exists);
+  RUN(test_is_regular_file);
+  RUN(test_is_directory);
+  RUN(test_is_symlink);
+  RUN(test_file_size);
+  RUN(test_last_write_time);
+  RUN(test_permissions);
+  RUN(test_current_path);
+  RUN(test_absolute);
+  RUN(test_canonical);
+  RUN(test_read_symlink);
+  RUN(test_create_symlink_and_hard_link);
+  RUN(test_space);
+  RUN(test_equivalent);
+  RUN(test_resize_file);
+  RUN(test_status);
+  return 0;
+}
+
+int main() {
+  int rc;
+  setup();
+  rc = test();
+  teardown();
+  return rc;
+}

third_party/libcxx/BUILD.mk

@@ -1094,11 +1094,11 @@ third_party/libcxx/fs/filesystem_clock.cpp \
 third_party/libcxx/fs/filesystem_error.cpp \
 third_party/libcxx/fs/int128_builtins.cpp \
 third_party/libcxx/fs/operations.cpp \
-third_party/libcxx/fs/cosmo.cpp \
 third_party/libcxx/fs/path.cpp \
 third_party/libcxx/ryu/d2fixed.cpp \
 third_party/libcxx/ryu/d2s.cpp \
 third_party/libcxx/ryu/f2s.cpp \
+third_party/libcxx/errc.cpp \
 
 THIRD_PARTY_LIBCXX_A_HDRS_CHECKEM = \
 third_party/libcxx/__assertion_handler \

third_party/libcxx/__system_error/errc.h

@@ -141,6 +141,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 // This leads to the odd pushing and popping of the deprecated
 // diagnostic.
 _LIBCPP_DECLARE_STRONG_ENUM(errc){
+  success = 0,
     address_family_not_supported = 65536, //       = EAFNOSUPPORT,
           address_in_use, //                     = EADDRINUSE,
           address_not_available, //              = EADDRNOTAVAIL,
@@ -221,6 +222,9 @@ _LIBCPP_DECLARE_STRONG_ENUM(errc){
     wrong_protocol_type};
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(errc)
 
+errc __err_to_errc(int) noexcept;
+int __errc_to_err(errc) noexcept;
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___ERRC