builtin: use C.fwrite (buffered) for _write_buf_to_fd (#14558)

vlib/term/control.v

@@ -16,6 +16,7 @@ module term
 // y is the y coordinate
 pub fn set_cursor_position(c Coord) {
 	print('\x1b[$c.y;$c.x' + 'H')
+	flush_stdout()
 }
 
 // n is number of cells
@@ -25,6 +26,7 @@ pub fn set_cursor_position(c Coord) {
 // direction: D is backward / West
 pub fn move(n int, direction string) {
 	print('\x1b[$n$direction')
+	flush_stdout()
 }
 
 pub fn cursor_up(n int) {
@@ -50,6 +52,7 @@ pub fn cursor_back(n int) {
 
 pub fn erase_display(t string) {
 	print('\x1b[' + t + 'J')
+	flush_stdout()
 }
 
 pub fn erase_toend() {
@@ -63,6 +66,7 @@ pub fn erase_tobeg() {
 // clears entire screen and returns cursor to top left-corner
 pub fn erase_clear() {
 	print('\033[H\033[J')
+	flush_stdout()
 }
 
 pub fn erase_del_clear() {
@@ -75,6 +79,7 @@ pub fn erase_del_clear() {
 // Note: Cursor position does not change
 pub fn erase_line(t string) {
 	print('\x1b[' + t + 'K')
+	flush_stdout()
 }
 
 pub fn erase_line_toend() {
@@ -92,11 +97,13 @@ pub fn erase_line_clear() {
 // Will make cursor appear if not visible
 pub fn show_cursor() {
 	print('\x1b[?25h')
+	flush_stdout()
 }
 
 // Will make cursor invisible
 pub fn hide_cursor() {
 	print('\x1b[?25l')
+	flush_stdout()
 }
 
 // clear_previous_line - useful for progressbars.
@@ -105,4 +112,5 @@ pub fn hide_cursor() {
 // the previous content.
 pub fn clear_previous_line() {
 	print('\r\x1b[1A\x1b[2K')
+	flush_stdout()
 }

vlib/term/term_nix.c.v

@@ -52,6 +52,7 @@ pub fn get_cursor_position() ?Coord {
 	unsafe { C.tcsetattr(0, C.TCSANOW, &state) }
 
 	print('\e[6n')
+	flush_stdout()
 
 	mut x := 0
 	mut y := 0
@@ -87,6 +88,7 @@ pub fn set_terminal_title(title string) bool {
 	print('\033]0')
 	print(title)
 	print('\007')
+	flush_stdout()
 	return true
 }
 
@@ -94,4 +96,5 @@ pub fn set_terminal_title(title string) bool {
 pub fn clear() {
 	print('\x1b[2J')
 	print('\x1b[H')
+	flush_stdout()
 }

vlib/term/ui/input_nix.c.v

@@ -32,12 +32,14 @@ pub fn init(cfg Config) &Context {
 fn save_title() {
 	// restore the previously saved terminal title
 	print('\x1b[22;0t')
+	flush_stdout()
 }
 
 [inline]
 fn load_title() {
 	// restore the previously saved terminal title
 	print('\x1b[23;0t')
+	flush_stdout()
 }
 
 pub fn (mut ctx Context) run() ? {

vlib/term/ui/input_windows.c.v

@@ -26,6 +26,7 @@ fn restore_terminal_state() {
 			// clear the terminal and set the cursor to the origin
 			print('\x1b[2J\x1b[3J')
 			print('\x1b[?1049l')
+			flush_stdout()
 		}
 		C.SetConsoleMode(ui.ctx_ptr.stdin_handle, ui.stdin_at_startup)
 	}
@@ -65,6 +66,7 @@ pub fn init(cfg Config) &Context {
 		print('\x1b[?1049h')
 		// clear the terminal and set the cursor to the origin
 		print('\x1b[2J\x1b[3J\x1b[1;1H')
+		flush_stdout()
 	}
 
 	if ctx.cfg.hide_cursor {
@@ -74,6 +76,7 @@ pub fn init(cfg Config) &Context {
 
 	if ctx.cfg.window_title != '' {
 		print('\x1b]0;$ctx.cfg.window_title\x07')
+		flush_stdout()
 	}
 
 	unsafe {
@@ -317,10 +320,12 @@ fn (mut ctx Context) parse_events() {
 fn save_title() {
 	// restore the previously saved terminal title
 	print('\x1b[22;0t')
+	flush_stdout()
 }
 
 [inline]
 fn load_title() {
 	// restore the previously saved terminal title
 	print('\x1b[23;0t')
+	flush_stdout()
 }

vlib/term/ui/termios_nix.c.v

@@ -79,6 +79,7 @@ fn (mut ctx Context) termios_setup() ? {
 
 	if ctx.cfg.window_title != '' {
 		print('\x1b]0;$ctx.cfg.window_title\x07')
+		flush_stdout()
 	}
 
 	if !ctx.cfg.skip_init_checks {
@@ -90,6 +91,7 @@ fn (mut ctx Context) termios_setup() ? {
 		// feature-test the SU spec
 		sx, sy := get_cursor_position()
 		print('$bsu$esu')
+		flush_stdout()
 		ex, ey := get_cursor_position()
 		if sx == ex && sy == ey {
 			// the terminal either ignored or handled the sequence properly, enable SU
@@ -108,11 +110,14 @@ fn (mut ctx Context) termios_setup() ? {
 	C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &termios)
 	// enable mouse input
 	print('\x1b[?1003h\x1b[?1006h')
+	flush_stdout()
 	if ctx.cfg.use_alternate_buffer {
 		// switch to the alternate buffer
 		print('\x1b[?1049h')
+		flush_stdout()
 		// clear the terminal and set the cursor to the origin
 		print('\x1b[2J\x1b[3J\x1b[1;1H')
+		flush_stdout()
 	}
 	ctx.window_height, ctx.window_width = get_terminal_size()
 
@@ -162,6 +167,7 @@ fn (mut ctx Context) termios_setup() ? {
 
 fn get_cursor_position() (int, int) {
 	print('\033[6n')
+	flush_stdout()
 	mut s := ''
 	unsafe {
 		buf := malloc_noscan(25)
@@ -183,8 +189,10 @@ fn supports_truecolor() bool {
 	}
 	// set the bg color to some arbirtrary value (#010203), assumed not to be the default
 	print('\x1b[48:2:1:2:3m')
+	flush_stdout()
 	// andquery the current color
 	print('\x1bP\$qm\x1b\\')
+	flush_stdout()
 	mut s := ''
 	unsafe {
 		buf := malloc_noscan(25)
@@ -199,6 +207,7 @@ fn termios_reset() {
 	// C.TCSANOW ??
 	C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &ui.termios_at_startup)
 	print('\x1b[?1003l\x1b[?1006l\x1b[?25h')
+	flush_stdout()
 	c := ctx_ptr
 	if unsafe { c != 0 } && c.cfg.use_alternate_buffer {
 		print('\x1b[?1049l')

vlib/term/ui/ui.v

@@ -116,6 +116,7 @@ pub fn (mut ctx Context) clear() {
 [inline]
 pub fn (mut ctx Context) set_window_title(s string) {
 	print('\x1b]0;$s\x07')
+	flush_stdout()
 }
 
 // draw_point draws a point at position `x`,`y`.