343 lines
8.5 KiB
C++
343 lines
8.5 KiB
C++
/* Path implementation bits.
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*
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* This file is part of libostd. See COPYING.md for futher information.
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*/
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#include <cstdlib>
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#include <pwd.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <vector>
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#include "ostd/path.hh"
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namespace ostd {
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namespace fs {
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static perms mode_to_perms(mode_t mode) {
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perms ret = perms::none;
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switch (mode & S_IRWXU) {
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case S_IRUSR: ret |= perms::owner_read;
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case S_IWUSR: ret |= perms::owner_write;
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case S_IXUSR: ret |= perms::owner_exec;
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case S_IRWXU: ret |= perms::owner_all;
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}
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switch (mode & S_IRWXG) {
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case S_IRGRP: ret |= perms::group_read;
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case S_IWGRP: ret |= perms::group_write;
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case S_IXGRP: ret |= perms::group_exec;
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case S_IRWXG: ret |= perms::group_all;
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}
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switch (mode & S_IRWXO) {
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case S_IROTH: ret |= perms::others_read;
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case S_IWOTH: ret |= perms::others_write;
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case S_IXOTH: ret |= perms::others_exec;
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case S_IRWXO: ret |= perms::others_all;
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}
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if (mode & S_ISUID) {
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ret |= perms::set_uid;
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}
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if (mode & S_ISGID) {
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ret |= perms::set_gid;
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}
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if (mode & S_ISVTX) {
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ret |= perms::sticky_bit;
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}
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return ret;
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}
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static file_type mode_to_type(mode_t mode) {
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switch (mode & S_IFMT) {
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case S_IFBLK: return file_type::block;
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case S_IFCHR: return file_type::character;
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case S_IFIFO: return file_type::fifo;
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case S_IFREG: return file_type::regular;
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case S_IFDIR: return file_type::directory;
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case S_IFLNK: return file_type::symlink;
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case S_IFSOCK: return file_type::socket;
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}
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return file_type::unknown;
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}
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OSTD_EXPORT file_mode mode(path const &p) {
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struct stat sb;
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if (stat(p.string().data(), &sb) < 0) {
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if (errno == ENOENT) {
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return file_mode{file_type::not_found, perms::none};
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}
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/* FIXME: throw */
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abort();
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}
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return file_mode{mode_to_type(sb.st_mode), mode_to_perms(sb.st_mode)};
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}
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OSTD_EXPORT file_mode symlink_mode(path const &p) {
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struct stat sb;
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if (lstat(p.string().data(), &sb) < 0) {
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if (errno == ENOENT) {
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return file_mode{file_type::not_found, perms::none};
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}
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/* FIXME: throw */
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abort();
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}
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return file_mode{mode_to_type(sb.st_mode), mode_to_perms(sb.st_mode)};
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}
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} /* namespace fs */
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} /* namespace ostd */
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namespace ostd {
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namespace fs {
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namespace detail {
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static void dir_read_next(
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DIR *dh, path &cur, file_mode &tp, path const &base
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) {
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struct dirent d;
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struct dirent *o;
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for (;;) {
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if (readdir_r(dh, &d, &o)) {
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/* FIXME: throw */
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abort();
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}
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if (!o) {
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cur = path{};
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return;
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}
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string_range nm{static_cast<char const *>(o->d_name)};
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if ((nm == ".") || (nm == "..")) {
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continue;
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}
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path p{base};
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p.append(nm);
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#ifdef DT_UNKNOWN
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/* most systems have d_type */
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file_mode md{mode_to_type(DTTOIF(o->d_type))};
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#else
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/* fallback mainly for legacy */
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file_mode md = symlink_mode(p);
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#endif
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tp = md;
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cur = std::move(p);
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break;
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}
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}
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/* dir range */
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OSTD_EXPORT void dir_range_impl::open(path const &p) {
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DIR *d = opendir(p.string().data());
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if (!d) {
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/* FIXME: throw */
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abort();
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}
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p_dir = p;
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p_handle = d;
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read_next();
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}
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OSTD_EXPORT void dir_range_impl::close() noexcept {
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closedir(static_cast<DIR *>(p_handle));
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}
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OSTD_EXPORT void dir_range_impl::read_next() {
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path cur;
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file_mode tp;
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dir_read_next(static_cast<DIR *>(p_handle), cur, tp, p_dir);
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p_current = directory_entry{std::move(cur), tp};
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}
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/* recursive dir range */
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OSTD_EXPORT void rdir_range_impl::open(path const &p) {
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DIR *d = opendir(p.string().data());
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if (!d) {
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/* FIXME: throw */
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abort();
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}
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p_dir = p;
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p_handles.push(d);
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read_next();
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}
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OSTD_EXPORT void rdir_range_impl::close() noexcept {
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while (!p_handles.empty()) {
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closedir(static_cast<DIR *>(p_handles.top()));
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p_handles.pop();
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}
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}
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OSTD_EXPORT void rdir_range_impl::read_next() {
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if (p_handles.empty()) {
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return;
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}
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path curd;
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file_mode tp;
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/* can't reuse info from dirent because we need to expand symlinks */
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if (p_current.is_directory()) {
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/* directory, recurse into it and if it contains stuff, return */
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DIR *nd = opendir(p_current.path().string().data());
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if (!nd) {
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abort();
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}
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directory_entry based = p_current;
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dir_read_next(nd, curd, tp, based);
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if (!curd.empty()) {
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p_dir = based;
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p_handles.push(nd);
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p_current = directory_entry{std::move(curd), tp};
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return;
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} else {
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closedir(nd);
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}
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}
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/* didn't recurse into a directory, go to next file */
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dir_read_next(static_cast<DIR *>(p_handles.top()), curd, tp, p_dir);
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p_current = directory_entry{std::move(curd), tp};
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/* end of dir, pop while at it */
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if (p_current.path().empty()) {
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closedir(static_cast<DIR *>(p_handles.top()));
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p_handles.pop();
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if (!p_handles.empty()) {
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/* got back to another dir, read next so it's valid */
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p_dir.remove_name();
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dir_read_next(static_cast<DIR *>(p_handles.top()), curd, tp, p_dir);
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p_current = directory_entry{std::move(curd), tp};
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}
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}
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}
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} /* namespace detail */
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} /* namesapce fs */
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} /* namespace ostd */
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namespace ostd {
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namespace fs {
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OSTD_EXPORT path current_path() {
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auto pmax = pathconf(".", _PC_PATH_MAX);
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std::vector<char> rbuf;
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if (pmax > 0) {
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rbuf.reserve((pmax > 1024) ? 1024 : pmax);
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}
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for (;;) {
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auto p = getcwd(rbuf.data(), rbuf.capacity());
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if (!p) {
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if (errno != ERANGE) {
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abort();
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}
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rbuf.reserve(rbuf.capacity() * 2);
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continue;
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}
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break;
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}
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return path{string_range{rbuf.data()}};
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}
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OSTD_EXPORT path home_path() {
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char const *hdir = getenv("HOME");
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if (hdir) {
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return path{string_range{hdir}};
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}
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struct passwd pwd;
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struct passwd *ret;
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std::vector<char> buf;
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long bufs = sysconf(_SC_GETPW_R_SIZE_MAX);
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if (bufs < 0) {
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bufs = 2048;
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}
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buf.reserve(bufs);
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getpwuid_r(getuid(), &pwd, buf.data(), buf.capacity(), &ret);
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if (!ret) {
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abort();
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}
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return path{string_range{pwd.pw_dir}};
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}
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OSTD_EXPORT path temp_path() {
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char const *envs[] = { "TMPDIR", "TMP", "TEMP", "TEMPDIR", NULL };
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for (char const **p = envs; *p; ++p) {
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char const *tdir = getenv(*p);
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if (tdir) {
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return path{string_range{tdir}};
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}
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}
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return path{"/tmp"};
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}
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OSTD_EXPORT path absolute(path const &p) {
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if (p.is_absolute()) {
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return p;
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}
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return current_path() / p;
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}
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OSTD_EXPORT path canonical(path const &p) {
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/* TODO: legacy system support */
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char *rp = realpath(p.string().data(), nullptr);
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if (!rp) {
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abort();
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}
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path ret{string_range{rp}};
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free(rp);
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return ret;
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}
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static inline bool try_access(path const &p) {
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bool ret = !access(p.string().data(), F_OK);
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if (!ret && (errno != ENOENT)) {
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abort();
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}
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return ret;
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}
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OSTD_EXPORT path weakly_canonical(path const &p) {
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if (try_access(p)) {
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return canonical(p);
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}
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path cp{p};
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for (;;) {
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if (!cp.has_name()) {
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/* went all the way back to root */
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return p;
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}
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cp.remove_name();
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if (try_access(cp)) {
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break;
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}
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}
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/* cp refers to an existing section, canonicalize */
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path ret = canonical(cp);
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auto pstr = p.string();
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/*a append the unresolved rest */
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ret.append(pstr.slice(cp.string().size(), pstr.size()));
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return ret;
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}
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OSTD_EXPORT path relative(path const &p, path const &base) {
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return weakly_canonical(p).relative_to(weakly_canonical(base));
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}
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OSTD_EXPORT bool exists(path const &p) {
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return try_access(p);
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}
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OSTD_EXPORT bool equivalent(path const &p1, path const &p2) {
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struct stat sb;
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if (stat(p1.string().data(), &sb) < 0) {
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abort();
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}
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auto stdev = sb.st_dev;
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auto stino = sb.st_ino;
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if (stat(p2.string().data(), &sb) < 0) {
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abort();
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}
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return ((sb.st_dev == stdev) && (sb.st_ino == stino));
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}
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} /* namespace fs */
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} /* namespace ostd */
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