Clean up `err != nil` usage

core/os/file_windows.odin

@@ -531,14 +531,9 @@ ftruncate :: proc(fd: Handle, length: i64) -> (err: Errno) {
 }
 
 truncate :: proc(path: string, length: i64) -> (err: Errno) {
-	fd: Handle
-	fd, err = open(path, O_WRONLY|O_CREATE, 0o666)
-	if err != nil {
-		return
-	}
+	fd := open(path, O_WRONLY|O_CREATE, 0o666) or_return
 	defer close(fd)
-	err = ftruncate(fd, length)
-	return
+	return ftruncate(fd, length)
 }
 
 

core/os/os2/file_util.odin

@@ -173,11 +173,8 @@ write_entire_file :: proc(name: string, data: []byte, perm: int, truncate := tru
 	if truncate {
 		flags |= O_TRUNC
 	}
-	f, err := open(name, flags, perm)
-	if err != nil {
-		return err
-	}
-	_, err = write(f, data)
+	f := open(name, flags, perm) or_return
+	_, err := write(f, data)
 	if cerr := close(f); cerr != nil && err == nil {
 		err = cerr
 	}

core/os/os2/stat_windows.odin

@@ -6,25 +6,22 @@ import "core:time"
 import "core:strings"
 import win32 "core:sys/windows"
 
-_fstat :: proc(f: ^File, allocator: runtime.Allocator) -> (File_Info, Error) {
+_fstat :: proc(f: ^File, allocator: runtime.Allocator) -> (fi: File_Info, err: Error) {
 	if f == nil || (^File_Impl)(f.impl).fd == nil {
-		return {}, nil
+		return
 	}
 
-	path, err := _cleanpath_from_handle(f, allocator)
-	if err != nil {
-		return {}, err
-	}
+	path := _cleanpath_from_handle(f, allocator) or_return
 
 	h := _handle(f)
 	switch win32.GetFileType(h) {
 	case win32.FILE_TYPE_PIPE, win32.FILE_TYPE_CHAR:
-		fi := File_Info {
+		fi = File_Info {
 			fullpath = path,
 			name = basename(path),
 			type = file_type(h),
 		}
-		return fi, nil
+		return
 	}
 
 	return _file_info_from_get_file_information_by_handle(path, h, allocator)

core/os/os_darwin.odin

@@ -644,7 +644,7 @@ get_last_error_string :: proc() -> string {
 }
 
 
-open :: proc(path: string, flags: int = O_RDWR, mode: int = 0) -> (Handle, Errno) {
+open :: proc(path: string, flags: int = O_RDWR, mode: int = 0) -> (handle: Handle, err: Errno) {
 	isDir := is_dir_path(path)
 	flags := flags
 	if isDir {
@@ -657,9 +657,10 @@ open :: proc(path: string, flags: int = O_RDWR, mode: int = 0) -> (Handle, Errno
 
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()
 	cstr := strings.clone_to_cstring(path, context.temp_allocator)
-	handle := _unix_open(cstr, i32(flags), u16(mode))
-	if handle == -1 {
-		return INVALID_HANDLE, get_last_error()
+	handle = _unix_open(cstr, i32(flags), u16(mode))
+	if handle == INVALID_HANDLE {
+		err = get_last_error()
+		return
 	}
 
 	/*
@@ -667,14 +668,14 @@ open :: proc(path: string, flags: int = O_RDWR, mode: int = 0) -> (Handle, Errno
 		               should not happen if the handle is a directory
 	*/
 	if mode != 0 && !isDir {
-		err := fchmod(handle, cast(u16)mode)
+		err = fchmod(handle, cast(u16)mode)
 		if err != nil {
 			_unix_close(handle)
-			return INVALID_HANDLE, err
+			handle = INVALID_HANDLE
 		}
 	}
 
-	return handle, nil
+	return
 }
 
 fchmod :: proc(fd: Handle, mode: u16) -> Errno {

core/os/os_wasi.odin

@@ -219,12 +219,10 @@ _processor_core_count :: proc() -> int {
 	return 1
 }
 
-file_size :: proc(fd: Handle) -> (i64, Errno) {
-	stat, err := wasi.fd_filestat_get(wasi.fd_t(fd))
-	if err != nil {
-		return 0, Platform_Error(err)
-	}
-	return i64(stat.size), nil
+file_size :: proc(fd: Handle) -> (size: i64, err: Errno) {
+	stat := wasi.fd_filestat_get(wasi.fd_t(fd)) or_return
+	size = i64(stat.size)
+	return
 }