Update packages os, path, and filepath

10 files changed, 765 insertions, 411 deletions

diff --git a/core/os/env_windows.odin b/core/os/env_windows.odin
new file mode 100644
index 000000000..8a4cee967
--- /dev/null
+++ b/core/os/env_windows.odin
@@ -0,0 +1,103 @@
+package os
+
+import win32 "core:sys/windows"
+import "core:mem"
+
+// lookup_env gets the value of the environment variable named by the key
+// If the variable is found in the environment the value (which can be empty) is returned and the boolean is true
+// Otherwise the returned value will be empty and the boolean will be false
+// NOTE: the value will be allocated with the supplied allocator
+lookup_env :: proc(key: string, allocator := context.allocator) -> (value: string, found: bool) {
+	if key == "" {
+		return;
+	}
+	wkey := win32.utf8_to_wstring(key);
+	b := make([dynamic]u16, 100, context.temp_allocator);
+	for {
+		n := win32.GetEnvironmentVariableW(wkey, raw_data(b), u32(len(b)));
+		if n == 0 {
+			err := win32.GetLastError();
+			if err == u32(ERROR_ENVVAR_NOT_FOUND) {
+				return "", false;
+			}
+		}
+
+		if n <= u32(len(b)) {
+			value = win32.utf16_to_utf8(b[:n], allocator);
+			found = true;
+			return;
+		}
+
+		resize(&b, len(b)*2);
+	}
+}
+
+
+// get_env retrieves the value of the environment variable named by the key
+// It returns the value, which will be empty if the variable is not present
+// To distinguish between an empty value and an unset value, use lookup_env
+// NOTE: the value will be allocated with the supplied allocator
+get_env :: proc(key: string, allocator := context.allocator) -> (value: string) {
+	value, _ = lookup_env(key, allocator);
+	return;
+}
+
+// set_env sets the value of the environment variable named by the key
+set_env :: proc(key, value: string) -> Errno {
+	k := win32.utf8_to_wstring(key);
+	v := win32.utf8_to_wstring(value);
+
+	if !win32.SetEnvironmentVariableW(k, v) {
+		return Errno(win32.GetLastError());
+	}
+	return 0;
+}
+
+// unset_env unsets a single environment variable
+unset_env :: proc(key: string) -> Errno {
+	k := win32.utf8_to_wstring(key);
+	if !win32.SetEnvironmentVariableW(k, nil) {
+		return Errno(win32.GetLastError());
+	}
+	return 0;
+}
+
+// environ returns a copy of strings representing the environment, in the form "key=value"
+// NOTE: the slice of strings and the strings with be allocated using the supplied allocator
+environ :: proc(allocator := context.allocator) -> []string {
+	envs := win32.GetEnvironmentStringsW();
+	if envs == nil {
+		return nil;
+	}
+	defer win32.FreeEnvironmentStringsW(envs);
+
+	r := make([dynamic]string, 0, 50, allocator);
+	for from, i, p := 0, 0, envs; true; i += 1 {
+		c := (^u16)(uintptr(p) + uintptr(i*2))^;
+		if c == 0 {
+			if i <= from {
+				break;
+			}
+			w := mem.slice_ptr(mem.ptr_offset(p, from), i-from);
+
+			append(&r, win32.utf16_to_utf8(w, allocator));
+			from = i + 1;
+		}
+	}
+
+	return r[:];
+}
+
+
+// clear_env deletes all environment variables
+clear_env :: proc() {
+	envs := environ(context.temp_allocator);
+	for env in envs {
+		for j in 1..<len(env) {
+			if env[j] == '=' {
+				unset_env(env[0:j]);
+				break;
+			}
+		}
+	}
+}
diff --git a/core/os/file_windows.odin b/core/os/file_windows.odin
new file mode 100644
index 000000000..bf9784319
--- /dev/null
+++ b/core/os/file_windows.odin
@@ -0,0 +1,400 @@
+package os
+
+import win32 "core:sys/windows"
+import "intrinsics"
+
+is_path_separator :: proc(c: byte) -> bool {
+	return c == '/' || c == '\\';
+}
+
+open :: proc(path: string, mode: int = O_RDONLY, perm: int = 0) -> (Handle, Errno) {
+	if len(path) == 0 {
+		return INVALID_HANDLE, ERROR_FILE_NOT_FOUND;
+	}
+
+	access: u32;
+	switch mode & (O_RDONLY|O_WRONLY|O_RDWR) {
+	case O_RDONLY: access = win32.FILE_GENERIC_READ;
+	case O_WRONLY: access = win32.FILE_GENERIC_WRITE;
+	case O_RDWR:   access = win32.FILE_GENERIC_READ | win32.FILE_GENERIC_WRITE;
+	}
+
+	if mode&O_APPEND != 0 {
+		access &~= win32.FILE_GENERIC_WRITE;
+		access |=  win32.FILE_APPEND_DATA;
+	}
+	if mode&O_CREATE != 0 {
+		access |= win32.FILE_GENERIC_WRITE;
+	}
+
+	share_mode := u32(win32.FILE_SHARE_READ|win32.FILE_SHARE_WRITE);
+	sa: ^win32.SECURITY_ATTRIBUTES = nil;
+	sa_inherit := win32.SECURITY_ATTRIBUTES{nLength = size_of(win32.SECURITY_ATTRIBUTES), bInheritHandle = true};
+	if mode&O_CLOEXEC == 0 {
+		sa = &sa_inherit;
+	}
+
+	create_mode: u32;
+	switch {
+	case mode&(O_CREATE|O_EXCL) == (O_CREATE | O_EXCL):
+		create_mode = win32.CREATE_NEW;
+	case mode&(O_CREATE|O_TRUNC) == (O_CREATE | O_TRUNC):
+		create_mode = win32.CREATE_ALWAYS;
+	case mode&O_CREATE == O_CREATE:
+		create_mode = win32.OPEN_ALWAYS;
+	case mode&O_TRUNC == O_TRUNC:
+		create_mode = win32.TRUNCATE_EXISTING;
+	case:
+		create_mode = win32.OPEN_EXISTING;
+	}
+	wide_path := win32.utf8_to_wstring(path);
+	handle := Handle(win32.CreateFileW(auto_cast wide_path, access, share_mode, sa, create_mode, win32.FILE_ATTRIBUTE_NORMAL|win32.FILE_FLAG_BACKUP_SEMANTICS, nil));
+	if handle != INVALID_HANDLE {
+		return handle, ERROR_NONE;
+	}
+
+	err := Errno(win32.GetLastError());
+	return INVALID_HANDLE, err;
+}
+
+close :: proc(fd: Handle) -> Errno {
+	if !win32.CloseHandle(win32.HANDLE(fd)) {
+		return Errno(win32.GetLastError());
+	}
+	return ERROR_NONE;
+}
+
+
+
+write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
+	if len(data) == 0 {
+		return 0, ERROR_NONE;
+	}
+
+	single_write_length: win32.DWORD;
+	total_write: i64;
+	length := i64(len(data));
+
+	for total_write < length {
+		remaining := length - total_write;
+		MAX :: 1<<31-1;
+		to_write := win32.DWORD(min(i32(remaining), MAX));
+
+		e := win32.WriteFile(win32.HANDLE(fd), &data[total_write], to_write, &single_write_length, nil);
+		if single_write_length <= 0 || !e {
+			err := Errno(win32.GetLastError());
+			return int(total_write), err;
+		}
+		total_write += i64(single_write_length);
+	}
+	return int(total_write), ERROR_NONE;
+}
+
+read :: proc(fd: Handle, data: []byte) -> (int, Errno) {
+	if len(data) == 0 {
+		return 0, ERROR_NONE;
+	}
+
+	single_read_length: win32.DWORD;
+	total_read: i64;
+	length := i64(len(data));
+
+	for total_read < length {
+		remaining := length - total_read;
+		MAX :: 1<<32-1;
+		to_read := win32.DWORD(min(u32(remaining), MAX));
+
+		e := win32.ReadFile(win32.HANDLE(fd), &data[total_read], to_read, &single_read_length, nil);
+		if single_read_length <= 0 || !e {
+			err := Errno(win32.GetLastError());
+			return int(total_read), err;
+		}
+		total_read += i64(single_read_length);
+	}
+	return int(total_read), ERROR_NONE;
+}
+
+seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
+	w: u32;
+	switch whence {
+	case 0: w = win32.FILE_BEGIN;
+	case 1: w = win32.FILE_CURRENT;
+	case 2: w = win32.FILE_END;
+	}
+	hi := i32(offset>>32);
+	lo := i32(offset);
+	ft := win32.GetFileType(win32.HANDLE(fd));
+	if ft == win32.FILE_TYPE_PIPE {
+		return 0, ERROR_FILE_IS_PIPE;
+	}
+
+	dw_ptr := win32.SetFilePointer(win32.HANDLE(fd), lo, &hi, w);
+	if dw_ptr == win32.INVALID_SET_FILE_POINTER {
+		err := Errno(win32.GetLastError());
+		return 0, err;
+	}
+	return i64(hi)<<32 + i64(dw_ptr), ERROR_NONE;
+}
+
+file_size :: proc(fd: Handle) -> (i64, Errno) {
+	length: win32.LARGE_INTEGER;
+	err: Errno;
+	if !win32.GetFileSizeEx(win32.HANDLE(fd), &length) {
+		err = Errno(win32.GetLastError());
+	}
+	return i64(length), err;
+}
+
+
+// NOTE(bill): Uses startup to initialize it
+stdin  := get_std_handle(uint(win32.STD_INPUT_HANDLE));
+stdout := get_std_handle(uint(win32.STD_OUTPUT_HANDLE));
+stderr := get_std_handle(uint(win32.STD_ERROR_HANDLE));
+
+
+get_std_handle :: proc "contextless" (h: uint) -> Handle {
+	fd := win32.GetStdHandle(win32.DWORD(h));
+	when size_of(uintptr) == 8 {
+		win32.SetHandleInformation(fd, win32.HANDLE_FLAG_INHERIT, 0);
+	}
+	return Handle(fd);
+}
+
+
+exists :: proc(path: string) -> bool {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	attribs := win32.GetFileAttributesW(wpath);
+
+	return i32(attribs) != win32.INVALID_FILE_ATTRIBUTES;
+}
+
+is_file :: proc(path: string) -> bool {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	attribs := win32.GetFileAttributesW(wpath);
+
+	if i32(attribs) != win32.INVALID_FILE_ATTRIBUTES {
+		return attribs & win32.FILE_ATTRIBUTE_DIRECTORY == win32.FILE_ATTRIBUTE_DIRECTORY;
+	}
+	return false;
+}
+
+is_dir :: proc(path: string) -> bool {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	attribs := win32.GetFileAttributesW(wpath);
+
+	if i32(attribs) != win32.INVALID_FILE_ATTRIBUTES {
+		return attribs & win32.FILE_ATTRIBUTE_DIRECTORY != win32.FILE_ATTRIBUTE_DIRECTORY;
+	}
+	return false;
+}
+
+// NOTE(tetra): GetCurrentDirectory is not thread safe with SetCurrentDirectory and GetFullPathName;
+// The current directory is stored as a global variable in the process.
+@private cwd_gate := false;
+
+get_current_directory :: proc(allocator := context.allocator) -> string {
+	for intrinsics.atomic_xchg(&cwd_gate, true) {}
+
+	sz_utf16 := win32.GetCurrentDirectoryW(0, nil);
+	dir_buf_wstr := make([]u16, sz_utf16, context.temp_allocator); // the first time, it _includes_ the NUL.
+
+	sz_utf16 = win32.GetCurrentDirectoryW(win32.DWORD(len(dir_buf_wstr)), auto_cast &dir_buf_wstr[0]);
+	assert(int(sz_utf16)+1 == len(dir_buf_wstr)); // the second time, it _excludes_ the NUL.
+
+	intrinsics.atomic_store(&cwd_gate, false);
+
+	return win32.utf16_to_utf8(dir_buf_wstr, allocator);
+}
+
+set_current_directory :: proc(path: string) -> (err: Errno) {
+	wstr := win32.utf8_to_wstring(path);
+
+	for intrinsics.atomic_xchg(&cwd_gate, true) {}
+	defer intrinsics.atomic_store(&cwd_gate, false);
+
+	res := win32.SetCurrentDirectoryW(auto_cast wstr);
+	if !res {
+		return Errno(win32.GetLastError());
+	}
+
+	return;
+}
+
+
+
+change_directory :: proc(path: string) -> Errno {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	return Errno(win32.SetCurrentDirectoryW(wpath));
+}
+
+make_directory :: proc(path: string, mode: u32) -> Errno {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	return Errno(win32.CreateDirectoryW(wpath, nil));
+}
+
+
+remove_directory :: proc(path: string) -> Errno {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	return Errno(win32.RemoveDirectoryW(wpath));
+}
+
+
+
+@(private)
+is_abs :: proc(path: string) -> bool {
+	if len(path) > 0 && path[0] == '/' {
+		return true;
+	}
+	when ODIN_OS == "windows" {
+		if len(path) > 2 {
+			switch path[0] {
+			case 'A'..'Z', 'a'..'z':
+				return path[1] == ':' && is_path_separator(path[2]);
+			}
+		}
+	}
+	return false;
+}
+
+@(private)
+fix_long_path :: proc(path: string) -> string {
+	if len(path) < 248 {
+		return path;
+	}
+
+	if len(path) >= 2 && path[:2] == `\\` {
+		return path;
+	}
+	if !is_abs(path) {
+		return path;
+	}
+
+	prefix :: `\\?`;
+
+	path_buf := make([]byte, len(prefix)+len(path)+len(`\`), context.temp_allocator);
+	copy(path_buf, prefix);
+	n := len(path);
+	r, w := 0, len(prefix);
+	for r < n {
+		switch {
+		case is_path_separator(path[r]):
+			r += 1;
+		case path[r] == '.' && (r+1 == n || is_path_separator(path[r+1])):
+			r += 1;
+		case r+1 < n && path[r] == '.' && path[r+1] == '.' && (r+2 == n || is_path_separator(path[r+2])):
+			return path;
+		case:
+			path_buf[w] = '\\';
+			w += 1;
+			for ; r < n && !is_path_separator(path[r]); r += 1 {
+				path_buf[w] = path[r];
+				w += 1;
+			}
+		}
+	}
+
+	if w == len(`\\?\c:`) {
+		path_buf[w] = '\\';
+		w += 1;
+	}
+	return string(path_buf[:w]);
+}
+
+
+link :: proc(old_name, new_name: string) -> Errno {
+	n := win32.utf8_to_wstring(fix_long_path(new_name));
+	o := win32.utf8_to_wstring(fix_long_path(old_name));
+	return Errno(win32.CreateHardLinkW(n, o, nil));
+}
+
+unlink :: proc(path: string) -> Errno {
+	wpath := win32.utf8_to_wstring(path, context.temp_allocator);
+	return Errno(win32.DeleteFileW(wpath));
+}
+
+
+
+rename :: proc(old_path, new_path: string) -> Errno {
+	from := win32.utf8_to_wstring(old_path, context.temp_allocator);
+	to := win32.utf8_to_wstring(new_path, context.temp_allocator);
+	return Errno(win32.MoveFileExW(from, to, win32.MOVEFILE_REPLACE_EXISTING));
+}
+
+
+ftruncate :: proc(fd: Handle, length: i64) -> (err: Errno) {
+	curr_off, e := seek(fd, 0, 1);
+	if e != 0 {
+		return e;
+	}
+	defer seek(fd, curr_off, 0);
+	_, e = seek(fd, length, 0);
+	if e != 0 {
+		return e;
+	}
+	ok := win32.SetEndOfFile(win32.HANDLE(fd));
+	if !ok {
+		return Errno(win32.GetLastError());
+	}
+	return ERROR_NONE;
+}
+
+truncate :: proc(path: string, length: i64) -> (err: Errno) {
+	fd: Handle;
+	fd, err = open(path, O_WRONLY|O_CREATE, 0o666);
+	if err != 0 {
+		return;
+	}
+	defer close(fd);
+	err = ftruncate(fd, length);
+	return;
+}
+
+
+remove :: proc(name: string) -> Errno {
+	p := win32.utf8_to_wstring(fix_long_path(name));
+	err, err1: win32.DWORD;
+	if !win32.DeleteFileW(p) {
+		err = win32.GetLastError();
+	}
+	if err == 0 {
+		return 0;
+	}
+	if !win32.RemoveDirectoryW(p) {
+		err1 = win32.GetLastError();
+	}
+	if err1 == 0 {
+		return 0;
+	}
+
+	if err != err1 {
+		a := win32.GetFileAttributesW(p);
+		if a == ~u32(0) {
+			err = win32.GetLastError();
+		} else {
+			if a & win32.FILE_ATTRIBUTE_DIRECTORY != 0 {
+				err = err1;
+			} else if a & win32.FILE_ATTRIBUTE_READONLY != 0 {
+				if win32.SetFileAttributesW(p, a &~ win32.FILE_ATTRIBUTE_READONLY) {
+					err = 0;
+					if !win32.DeleteFileW(p) {
+						err = win32.GetLastError();
+					}
+				}
+			}
+		}
+	}
+
+	return Errno(err);
+}
+
+
+pipe :: proc() -> (r, w: Handle, err: Errno) {
+	sa: win32.SECURITY_ATTRIBUTES;
+	sa.nLength = size_of(win32.SECURITY_ATTRIBUTES);
+	sa.bInheritHandle = true;
+	if !win32.CreatePipe((^win32.HANDLE)(&r), (^win32.HANDLE)(&w), &sa, 0) {
+		err = Errno(win32.GetLastError());
+	}
+	return;
+}
+
diff --git a/core/os/os_windows.odin b/core/os/os_windows.odin
index d918983c6..b8c171008 100644
--- a/core/os/os_windows.odin
+++ b/core/os/os_windows.odin
@@ -2,7 +2,6 @@
 package os
 
 import win32 "core:sys/windows"
-import "core:intrinsics"
 
 Handle    :: distinct uintptr;
 File_Time :: distinct u64;
@@ -63,164 +62,6 @@ ERROR_FILE_IS_NOT_DIR:        Errno : 1<<29 + 1;
 args := _alloc_command_line_arguments();
 
 
-is_path_separator :: proc(r: rune) -> bool {
-	return r == '/' || r == '\\';
-}
-
-open :: proc(path: string, mode: int = O_RDONLY, perm: int = 0) -> (Handle, Errno) {
-	if len(path) == 0 {
-		return INVALID_HANDLE, ERROR_FILE_NOT_FOUND;
-	}
-
-	access: u32;
-	switch mode & (O_RDONLY|O_WRONLY|O_RDWR) {
-	case O_RDONLY: access = win32.FILE_GENERIC_READ;
-	case O_WRONLY: access = win32.FILE_GENERIC_WRITE;
-	case O_RDWR:   access = win32.FILE_GENERIC_READ | win32.FILE_GENERIC_WRITE;
-	}
-
-	if mode&O_APPEND != 0 {
-		access &~= win32.FILE_GENERIC_WRITE;
-		access |=  win32.FILE_APPEND_DATA;
-	}
-	if mode&O_CREATE != 0 {
-		access |= win32.FILE_GENERIC_WRITE;
-	}
-
-	share_mode := u32(win32.FILE_SHARE_READ|win32.FILE_SHARE_WRITE);
-	sa: ^win32.SECURITY_ATTRIBUTES = nil;
-	sa_inherit := win32.SECURITY_ATTRIBUTES{nLength = size_of(win32.SECURITY_ATTRIBUTES), bInheritHandle = true};
-	if mode&O_CLOEXEC == 0 {
-		sa = &sa_inherit;
-	}
-
-	create_mode: u32;
-	switch {
-	case mode&(O_CREATE|O_EXCL) == (O_CREATE | O_EXCL):
-		create_mode = win32.CREATE_NEW;
-	case mode&(O_CREATE|O_TRUNC) == (O_CREATE | O_TRUNC):
-		create_mode = win32.CREATE_ALWAYS;
-	case mode&O_CREATE == O_CREATE:
-		create_mode = win32.OPEN_ALWAYS;
-	case mode&O_TRUNC == O_TRUNC:
-		create_mode = win32.TRUNCATE_EXISTING;
-	case:
-		create_mode = win32.OPEN_EXISTING;
-	}
-	wide_path := win32.utf8_to_wstring(path);
-	handle := Handle(win32.CreateFileW(auto_cast wide_path, access, share_mode, sa, create_mode, win32.FILE_ATTRIBUTE_NORMAL|win32.FILE_FLAG_BACKUP_SEMANTICS, nil));
-	if handle != INVALID_HANDLE {
-		return handle, ERROR_NONE;
-	}
-
-	err := Errno(win32.GetLastError());
-	return INVALID_HANDLE, err;
-}
-
-close :: proc(fd: Handle) -> Errno {
-	if !win32.CloseHandle(win32.HANDLE(fd)) {
-		return Errno(win32.GetLastError());
-	}
-	return ERROR_NONE;
-}
-
-
-write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
-	if len(data) == 0 {
-		return 0, ERROR_NONE;
-	}
-
-	single_write_length: win32.DWORD;
-	total_write: i64;
-	length := i64(len(data));
-
-	for total_write < length {
-		remaining := length - total_write;
-		MAX :: 1<<31-1;
-		to_write := win32.DWORD(min(i32(remaining), MAX));
-
-		e := win32.WriteFile(win32.HANDLE(fd), &data[total_write], to_write, &single_write_length, nil);
-		if single_write_length <= 0 || !e {
-			err := Errno(win32.GetLastError());
-			return int(total_write), err;
-		}
-		total_write += i64(single_write_length);
-	}
-	return int(total_write), ERROR_NONE;
-}
-
-read :: proc(fd: Handle, data: []byte) -> (int, Errno) {
-	if len(data) == 0 {
-		return 0, ERROR_NONE;
-	}
-
-	single_read_length: win32.DWORD;
-	total_read: i64;
-	length := i64(len(data));
-
-	for total_read < length {
-		remaining := length - total_read;
-		MAX :: 1<<32-1;
-		to_read := win32.DWORD(min(u32(remaining), MAX));
-
-		e := win32.ReadFile(win32.HANDLE(fd), &data[total_read], to_read, &single_read_length, nil);
-		if single_read_length <= 0 || !e {
-			err := Errno(win32.GetLastError());
-			return int(total_read), err;
-		}
-		total_read += i64(single_read_length);
-	}
-	return int(total_read), ERROR_NONE;
-}
-
-seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
-	w: u32;
-	switch whence {
-	case 0: w = win32.FILE_BEGIN;
-	case 1: w = win32.FILE_CURRENT;
-	case 2: w = win32.FILE_END;
-	}
-	hi := i32(offset>>32);
-	lo := i32(offset);
-	ft := win32.GetFileType(win32.HANDLE(fd));
-	if ft == win32.FILE_TYPE_PIPE {
-		return 0, ERROR_FILE_IS_PIPE;
-	}
-
-	dw_ptr := win32.SetFilePointer(win32.HANDLE(fd), lo, &hi, w);
-	if dw_ptr == win32.INVALID_SET_FILE_POINTER {
-		err := Errno(win32.GetLastError());
-		return 0, err;
-	}
-	return i64(hi)<<32 + i64(dw_ptr), ERROR_NONE;
-}
-
-file_size :: proc(fd: Handle) -> (i64, Errno) {
-	length: win32.LARGE_INTEGER;
-	err: Errno;
-	if !win32.GetFileSizeEx(win32.HANDLE(fd), &length) {
-		err = Errno(win32.GetLastError());
-	}
-	return i64(length), err;
-}
-
-
-
-// NOTE(bill): Uses startup to initialize it
-stdin  := get_std_handle(uint(win32.STD_INPUT_HANDLE));
-stdout := get_std_handle(uint(win32.STD_OUTPUT_HANDLE));
-stderr := get_std_handle(uint(win32.STD_ERROR_HANDLE));
-
-
-get_std_handle :: proc "contextless" (h: uint) -> Handle {
-	fd := win32.GetStdHandle(win32.DWORD(h));
-	when size_of(uintptr) == 8 {
-		win32.SetHandleInformation(fd, win32.HANDLE_FLAG_INHERIT, 0);
-	}
-	return Handle(fd);
-}
-
-
 
 
 
@@ -286,40 +127,6 @@ get_page_size :: proc() -> int {
 
 
 
-// NOTE(tetra): GetCurrentDirectory is not thread safe with SetCurrentDirectory and GetFullPathName;
-// The current directory is stored as a global variable in the process.
-@private cwd_gate := false;
-
-get_current_directory :: proc(allocator := context.allocator) -> string {
-	for intrinsics.atomic_xchg(&cwd_gate, true) {}
-
-	sz_utf16 := win32.GetCurrentDirectoryW(0, nil);
-	dir_buf_wstr := make([]u16, sz_utf16, context.temp_allocator); // the first time, it _includes_ the NUL.
-
-	sz_utf16 = win32.GetCurrentDirectoryW(win32.DWORD(len(dir_buf_wstr)), auto_cast &dir_buf_wstr[0]);
-	assert(int(sz_utf16)+1 == len(dir_buf_wstr)); // the second time, it _excludes_ the NUL.
-
-	intrinsics.atomic_store(&cwd_gate, false);
-
-	return win32.utf16_to_utf8(dir_buf_wstr, allocator);
-}
-
-set_current_directory :: proc(path: string) -> (err: Errno) {
-	wstr := win32.utf8_to_wstring(path);
-
-	for intrinsics.atomic_xchg(&cwd_gate, true) {}
-	defer intrinsics.atomic_store(&cwd_gate, false);
-
-	res := win32.SetCurrentDirectoryW(auto_cast wstr);
-	if !res {
-		return Errno(win32.GetLastError());
-	}
-
-	return;
-}
-
-
-
 exit :: proc(code: int) -> ! {
 	win32.ExitProcess(win32.DWORD(code));
 }
diff --git a/core/path/filepath/path.odin b/core/path/filepath/path.odin
index c15ff110a..f2dbedf1f 100644
--- a/core/path/filepath/path.odin
+++ b/core/path/filepath/path.odin
@@ -42,6 +42,7 @@ volume_name_len :: proc(path: string) -> int {
 		}
 	}
 
+	// URL: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
 	if l := len(path); l >= 5 && is_slash(path[0]) && is_slash(path[1]) &&
 		!is_slash(path[2]) && path[2] != '.' {
 		for n := 3; n < l-1; n += 1 {
@@ -65,6 +66,31 @@ volume_name_len :: proc(path: string) -> int {
 	return 0;
 }
 
+base :: proc(path: string) -> string {
+	if path == "" {
+		return ".";
+	}
+
+	path := path;
+	for len(path) > 0 && is_separator(path[len(path)-1]) {
+		path = path[:len(path)-1];
+	}
+
+	path = path[volume_name_len(path):];
+
+	i := len(path)-1;
+	for i >= 0 && !is_separator(path[i]) {
+		i -= 1;
+	}
+	if i >= 0 {
+		path = path[i+1:];
+	}
+	if path == "" {
+		return SEPARATOR_STRING;
+	}
+	return path;
+}
+
 
 clean :: proc(path: string, allocator := context.allocator) -> string {
 	context.allocator = allocator;
@@ -76,7 +102,11 @@ clean :: proc(path: string, allocator := context.allocator) -> string {
 
 	if path == "" {
 		if vol_len > 1 && original_path[1] != ':' {
-			return from_slash(original_path);
+			s, ok := from_slash(original_path);
+			if !ok {
+				s = strings.clone(s);
+			}
+			return s;
 		}
 		return strings.concatenate({original_path, "."});
 	}
@@ -134,19 +164,133 @@ clean :: proc(path: string, allocator := context.allocator) -> string {
 	}
 
 	s := lazy_buffer_string(out);
-	cleaned := from_slash(s);
+	cleaned, new_allocation := from_slash(s);
+	if new_allocation {
+		delete(s);
+	}
 	return cleaned;
 }
 
-from_slash :: proc(path: string, allocator := context.allocator) -> string {
+from_slash :: proc(path: string, allocator := context.allocator) -> (new_path: string, new_allocation: bool) {
 	if SEPARATOR == '/' {
-		return path;
+		return path, false;
+	}
+	return strings.replace_all(path, "/", SEPARATOR_STRING, allocator);
+}
+
+to_slash :: proc(path: string, allocator := context.allocator) -> (new_path: string, new_allocation: bool) {
+	if SEPARATOR == '/' {
+		return path, false;
+	}
+	return strings.replace_all(path, SEPARATOR_STRING, "/", allocator);
+}
+
+ext :: proc(path: string) -> string {
+	for i := len(path)-1; i >= 0 && !is_separator(path[i]); i -= 1 {
+		if path[i] == '.' {
+			return path[i:];
+		}
+	}
+	return "";
+}
+
+
+Relative_Error :: enum {
+	None,
+
+	Cannot_Relate,
+}
+
+rel :: proc(base_path, target_path: string, allocator := context.allocator) -> (string, Relative_Error) {
+	context.allocator = allocator;
+	base_vol, target_vol := volume_name(base_path), volume_name(target_path);
+	base, target := clean(base_path), clean(target_path);
+
+	delete_target := true;
+	defer {
+		if delete_target {
+			delete(target);
+		}
+		delete(base);
+	}
+
+	if strings.equal_fold(target, base) {
+		return strings.clone("."), .None;
+	}
+
+	base = base[len(base_vol):];
+	target = target[len(target_vol):];
+	if base == "." {
+		base = "";
+	}
+
+	base_slashed := len(base) > 0 && base[0] == SEPARATOR;
+	target_slashed := len(target) > 0 && target[0] == SEPARATOR;
+	if base_slashed != target_slashed || !strings.equal_fold(base_vol, target_vol) {
+		return "", .Cannot_Relate;
+	}
+
+	bl, tl := len(base), len(target);
+	b0, bi, t0, ti: int;
+	for {
+		for bi < bl && base[bi] != SEPARATOR {
+			bi += 1;
+		}
+		for ti < tl && target[ti] != SEPARATOR {
+			ti += 1;
+		}
+		if !strings.equal_fold(target[t0:ti], base[t0:ti]) {
+			break;
+		}
+		if bi < bl {
+			bi += 1;
+		}
+		if ti < tl {
+			ti += 1;
+		}
+		b0, t0 = bi, ti;
+	}
+
+	if base[b0:bi] == ".." {
+		return "", .Cannot_Relate;
+	}
+
+	if b0 != bl {
+		seps := strings.count(base[b0:bl], SEPARATOR_STRING);
+		size := 2 + seps*3;
+		if tl != t0 {
+			size += 1 + tl - t0;
+		}
+		buf := make([]byte, size);
+		n := copy(buf, "..");
+		for i in 0..<seps {
+			buf[n] = SEPARATOR;
+			copy(buf[n+1:], "..");
+			n += 3;
+		}
+		if t0 != tl {
+			buf[n] = SEPARATOR;
+			copy(buf[n+1:], target[t0:]);
+		}
+		return string(buf), .None;
+	}
+
+	delete_target = false;
+	return target[t0:], .None;
+}
+
+dir :: proc(path: string, allocator := context.allocator) -> string {
+	vol := volume_name(path);
+	i := len(path) - 1;
+	for i >= len(vol) && is_separator(path[i]) {
+		i -= 1;
 	}
-	s, ok := strings.replace_all(path, "/", SEPARATOR_STRING, allocator);
-	if !ok {
-		s = strings.clone(s, allocator);
+	dir := clean(path[len(vol) : i+1], allocator);
+	defer delete(dir, allocator);
+	if dir == "." && len(vol) > 2 {
+		return strings.clone(vol);
 	}
-	return s;
+	return strings.concatenate({vol, dir});
 }
 
 
diff --git a/core/path/filepath/path_unix.odin b/core/path/filepath/path_unix.odin
index 7ffe6291e..c9d0e28f1 100644
--- a/core/path/filepath/path_unix.odin
+++ b/core/path/filepath/path_unix.odin
@@ -3,3 +3,4 @@ package filepath
 
 SEPARATOR :: '/';
 SEPARATOR_STRING :: `/`;
+LIST_SEPARATOR :: ':';
diff --git a/core/path/filepath/path_windows.odin b/core/path/filepath/path_windows.odin
index 604859ca8..e413133f8 100644
--- a/core/path/filepath/path_windows.odin
+++ b/core/path/filepath/path_windows.odin
@@ -1,10 +1,12 @@
 package filepath
 
 import "core:strings"
+import "core:os"
+import win32 "core:sys/windows"
 
 SEPARATOR :: '\\';
 SEPARATOR_STRING :: `\`;
-
+LIST_SEPARATOR :: ';';
 
 reserved_names := []string{
 	"CON", "PRN", "AUX", "NUL",
@@ -28,6 +30,108 @@ is_UNC :: proc(path: string) -> bool {
 	return volume_name_len(path) > 2;
 }
 
+
+is_abs :: proc(path: string) -> bool {
+	if is_reserved_name(path) {
+		return true;
+	}
+	l := volume_name_len(path);
+	if l == 0 {
+		return false;
+	}
+
+	path := path[l:];
+	if path == "" {
+		return false;
+	}
+	return is_slash(path[0]);
+}
+
+
+@(private)
+full_path :: proc(name: string, allocator := context.allocator) -> (path: string, err: os.Errno) {
+	name := name;
+	if name == "" {
+		name = ".";
+	}
+	p := win32.utf8_to_utf16(name, context.temp_allocator);
+	defer delete(p);
+	buf := make([dynamic]u16, 100, allocator);
+	for {
+		n := win32.GetFullPathNameW(raw_data(p), u32(len(buf)), raw_data(buf), nil);
+		if n == 0 {
+			delete(buf);
+			return "", os.Errno(win32.GetLastError());
+		}
+		if n <= u32(len(buf)) {
+			return win32.utf16_to_utf8(buf[:n]), os.ERROR_NONE;
+		}
+		resize(&buf, len(buf)*2);
+	}
+}
+
+
+
+
+abs :: proc(path: string, allocator := context.allocator) -> (string, bool) {
+	full_path, err := full_path(path, context.temp_allocator);
+	if err != 0 {
+		return "", false;
+	}
+	return clean(full_path, allocator), true;
+}
+
+split_list :: proc(path: string, allocator := context.allocator) -> []string {
+	if path == "" {
+		return nil;
+	}
+
+	start: int;
+	quote: bool;
+
+	start, quote = 0, false;
+	count := 0;
+
+	for i := 0; i < len(path); i += 1 {
+		c := path[i];
+		switch {
+		case c == '"':
+			quote = !quote;
+		case c == LIST_SEPARATOR && !quote:
+			count += 1;
+		}
+	}
+
+	start, quote = 0, false;
+	list := make([]string, count, allocator);
+	index := 0;
+	for i := 0; i < len(path); i += 1 {
+		c := path[i];
+		switch {
+		case c == '"':
+			quote = !quote;
+		case c == LIST_SEPARATOR && !quote:
+			list[index] = path[start:i];
+			index += 1;
+			start = i + 1;
+		}
+	}
+	assert(index == count);
+
+	for s, i in list {
+		s, new := strings.replace_all(s, `"`, ``, allocator);
+		if !new {
+			s = strings.clone(s, allocator);
+		}
+		list[i] = s;
+	}
+
+	return list;
+}
+
+
+
+
 join :: proc(elems: ..string, allocator := context.allocator) -> string {
 	for e, i in elems {
 		if e != "" {
diff --git a/core/path/path_unix.odin b/core/path/path_unix.odin
deleted file mode 100644
index b380d8187..000000000
--- a/core/path/path_unix.odin
+++ /dev/null
@@ -1,83 +0,0 @@
-//+build linux, darwin, freebsd
-package path
-
-foreign import libc "system:c"
-
-import "core:os"
-import "core:strings"
-
-
-MAX :: 4096; // @note(bp): apparently PATH_MAX is bullshit
-
-OS_SEPARATOR        :: '/';
-OS_SEPARATOR_STRING :: "/";
-
-OS_SEPARATORS :: `/`;
-OS_SEPARATORS_ARRAY :: []string{`/`};
-
-@(private)
-null_term :: proc(str: string) -> string {
-	for c, i in str {
-		if c == '\x00' {
-			return str[:i];
-		}
-	}
-	return str;
-}
-
-
-full :: proc(path: string, allocator := context.temp_allocator) -> string {
-	cpath := strings.clone_to_cstring(path, context.temp_allocator);
-
-	foreign libc {
-		realpath :: proc(path: cstring, resolved_path: ^u8) -> cstring ---;
-	}
-
-	buf := make([dynamic]u8, MAX, MAX, allocator);
-
-	cstr := realpath(cpath, &buf[0]);
-	for cstr == nil && os.get_last_error() == int(os.ENAMETOOLONG) {
-		resize(&buf, len(buf) + MAX);
-		cstr = realpath(cpath, &buf[0]);
-	}
-
-	return null_term(string(buf[:]));
-}
-
-current :: proc(allocator := context.temp_allocator) -> string {
-	foreign libc{
-		getcwd :: proc(buf: ^u8, size: int) -> cstring ---;
-	}
-
-	buf := make([dynamic]u8, MAX, MAX, allocator);
-
-	cstr := getcwd(&buf[0], len(buf));
-	for cstr == nil && os.get_last_error() == int(os.ENAMETOOLONG) {
-		resize(&buf, len(buf) + MAX);
-		cstr = getcwd(&buf[0], len(buf));
-	}
-
-	return null_term(string(buf[:]));
-}
-
-
-exists :: proc(path: string) -> bool {
-	if _, err := os.stat(path); err != 0 {
-		return true;
-	}
-	return false;
-}
-
-is_dir :: proc(path: string) -> bool {
-	if stat, err := os.stat(path); err != 0 {
-		return os.S_ISDIR(u32(stat.mode));
-	}
-	return false;
-}
-
-is_file :: proc(path: string) -> bool {
-	if stat, err := os.stat(path); err != 0 {
-		return os.S_ISREG(u32(stat.mode));
-	}
-	return false;
-}
diff --git a/core/path/path_windows.odin b/core/path/path_windows.odin
deleted file mode 100644
index bc0360880..000000000
--- a/core/path/path_windows.odin
+++ /dev/null
@@ -1,124 +0,0 @@
-package path

-

-import "core:strings"

-import win32 "core:sys/windows"

-

-

-OS_SEPARATOR        :: '\\';

-OS_SEPARATOR_STRING :: "\\";

-

-OS_SEPARATORS :: `/\`;

-OS_SEPARATORS_ARRAY :: []string{`/`, `\`};

-

-@(private)

-null_term :: proc "contextless" (str: string) -> string {

-	for c, i in str {

-		if c == '\x00' {

-			return str[:i];

-		}

-	}

-	return str;

-}

-

-

-long :: proc(path: string, allocator := context.temp_allocator) -> string {

-	c_path := win32.utf8_to_wstring(path, context.temp_allocator);

-	length := win32.GetLongPathNameW(c_path, nil, 0);

-

-	if length == 0 {

-		return "";

-	}

-

-	buf := make([]u16, length, context.temp_allocator);

-

-	win32.GetLongPathNameW(c_path, win32.LPCWSTR(&buf[0]), length);

-

-	res := win32.utf16_to_utf8(buf[:length], allocator);

-

-	return null_term(res);

-}

-

-short :: proc(path: string, allocator := context.temp_allocator) -> string {

-	c_path := win32.utf8_to_wstring(path, context.temp_allocator);

-	length := win32.GetShortPathNameW(c_path, nil, 0);

-

-	if length == 0 {

-		return "";

-	}

-

-	buf := make([]u16, length, context.temp_allocator);

-

-	win32.GetShortPathNameW(c_path, win32.LPCWSTR(&buf[0]), length);

-

-	res := win32.utf16_to_utf8(buf[:length], allocator);

-

-	return null_term(res);

-}

-

-full :: proc(path: string, allocator := context.temp_allocator) -> string {

-	c_path := win32.utf8_to_wstring(path, context.temp_allocator);

-	length := win32.GetFullPathNameW(c_path, 0, nil, nil);

-

-	if length == 0 {

-		return "";

-	}

-

-	buf := make([]u16, length, context.temp_allocator);

-

-	win32.GetFullPathNameW(c_path, length, win32.LPCWSTR(&buf[0]), nil);

-

-	res := win32.utf16_to_utf8(buf[:length], allocator);

-

-	return null_term(res);

-}

-

-current :: proc(allocator := context.temp_allocator) -> string {

-	length := win32.GetCurrentDirectoryW(0, nil);

-

-	if length == 0 {

-		return "";

-	}

-

-	buf := make([]u16, length, context.temp_allocator);

-

-	win32.GetCurrentDirectoryW(length, win32.LPCWSTR(&buf[0]));

-

-	res := win32.utf16_to_utf8(buf[:length], allocator);

-

-	return strings.trim_null(res);

-}

-

-

-exists :: proc(path: string) -> bool {

-	c_path  := win32.utf8_to_wstring(path, context.temp_allocator);

-	attribs := win32.GetFileAttributesW(c_path);

-

-	return i32(attribs) != win32.INVALID_FILE_ATTRIBUTES;

-}

-

-is_dir :: proc(path: string) -> bool {

-	c_path  := win32.utf8_to_wstring(path, context.temp_allocator);

-	attribs := win32.GetFileAttributesW(c_path);

-

-	return (i32(attribs) != win32.INVALID_FILE_ATTRIBUTES) && (attribs & win32.FILE_ATTRIBUTE_DIRECTORY == win32.FILE_ATTRIBUTE_DIRECTORY);

-}

-

-is_file :: proc(path: string) -> bool {

-	c_path  := win32.utf8_to_wstring(path, context.temp_allocator);

-	attribs := win32.GetFileAttributesW(c_path);

-

-	return (i32(attribs) != win32.INVALID_FILE_ATTRIBUTES) && (attribs & win32.FILE_ATTRIBUTE_DIRECTORY != win32.FILE_ATTRIBUTE_DIRECTORY);

-}

-

-

-drive :: proc(path: string, new := false, allocator := context.allocator) -> string {

-	if len(path) >= 3 {

-		letter := path[:2];

-

-		if path[1] == ':' && (path[2] == '\\' || path[2] == '/') {

-			return new ? strings.clone(path[:2], allocator) : path[:2];

-		}

-	}

-

-	return "";

-}

diff --git a/core/runtime/default_allocators.odin b/core/runtime/default_allocators.odin
index a132b7a4f..052bbc91f 100644
--- a/core/runtime/default_allocators.odin
+++ b/core/runtime/default_allocators.odin
@@ -110,9 +110,7 @@ default_temp_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode
 		}
 		last_ptr := rawptr(&allocator.data[allocator.prev_offset]);
 		if old_memory == last_ptr {
-			full_size := allocator.curr_offset - allocator.prev_offset;
 			allocator.curr_offset = allocator.prev_offset;
-			mem_zero(last_ptr, full_size);
 			return nil;
 		} else {
 			#no_bounds_check start, end := &allocator.data[0], &allocator.data[allocator.curr_offset];
diff --git a/core/sys/windows/kernel32.odin b/core/sys/windows/kernel32.odin
index 55244c943..672114230 100644
--- a/core/sys/windows/kernel32.odin
+++ b/core/sys/windows/kernel32.odin
@@ -275,4 +275,8 @@ foreign kernel32 {
 
 	GetFinalPathNameByHandleW :: proc(hFile: HANDLE, lpszFilePath: LPCWSTR, cchFilePath: DWORD, dwFlags: DWORD) -> DWORD ---
 
+
+	SetEndOfFile :: proc(hFile: HANDLE) -> BOOL ---
+
+	CreatePipe :: proc(hReadPipe, hWritePipe: ^HANDLE, lpPipeAttributes: LPSECURITY_ATTRIBUTES, nSize: DWORD) -> BOOL ---
 }