106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
/**
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* @file FileSystem.cpp
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* @author apio (cloudapio.eu)
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* @brief APIs to read and modify the general file system.
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*
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* @copyright Copyright (c) 2023, the Luna authors.
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*
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <luna/Buffer.h>
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#include <luna/PathParser.h>
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#include <luna/String.h>
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#include <os/Directory.h>
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#include <os/FileSystem.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <unistd.h>
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namespace os::FileSystem
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{
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bool exists(const Path& path, bool follow_symlinks)
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{
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struct stat st;
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if (stat(path, st, follow_symlinks).has_error()) return false;
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return true;
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}
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bool is_directory(const Path& path, bool follow_symlinks)
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{
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struct stat st;
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if (stat(path, st, follow_symlinks).has_error()) return false;
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return S_ISDIR(st.st_mode);
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}
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Result<void> stat(const Path& path, struct stat& st, bool follow_symlinks)
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{
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int rc = fstatat(path.dirfd(), path.name().chars(), &st,
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(int)(path.is_empty_path() | (follow_symlinks ? 0 : AT_SYMLINK_NOFOLLOW)));
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if (rc < 0) return err(errno);
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return {};
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}
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Result<void> create_directory(StringView path, mode_t mode)
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{
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int rc = mkdir(path.chars(), mode);
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if (rc < 0) return err(errno);
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return {};
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}
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Result<void> remove(const Path& path)
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{
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// FIXME: This will not work on many operating systems that require rmdir() for directories.
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int rc = unlinkat(path.dirfd(), path.name().chars(), 0);
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if (rc < 0) return err(errno);
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return {};
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}
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Result<String> readlink(const Path& path)
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{
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struct stat st;
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TRY(stat(path, st, false));
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if (!S_ISLNK(st.st_mode)) return String {};
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Buffer buf = TRY(Buffer::create_sized(st.st_size + 1));
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memset(buf.data(), 0, buf.size());
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ssize_t nread = readlinkat(path.dirfd(), path.name().chars(), (char*)buf.data(), st.st_size);
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if (nread < 0) return err(errno);
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return String { (char*)buf.release_data(), (usize)nread };
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}
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Result<String> working_directory()
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{
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char* ptr = getcwd(NULL, 0);
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if (!ptr) return err(errno);
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return String { ptr };
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}
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Result<String> home_directory()
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{
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char* home = getenv("HOME");
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if (home) return String::from_cstring(home);
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struct passwd* pw = getpwuid(getuid());
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if (!pw) return err(ENOENT);
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return String::from_cstring(pw->pw_dir);
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}
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Result<void> change_directory(StringView path)
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{
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int rc = chdir(path.chars());
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if (rc < 0) return err(errno);
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return {};
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}
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}
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