fx.term: tty: implement get_cursor_position() and flush()

fx.term/include/fx/term/tty.h

@@ -50,6 +50,11 @@ enum {
 	FX_KEY_BACKSPACE,
 	FX_KEY_RETURN,
 
+	/* within this range, we further reserve a sub-range. applications can
+	 * define their own special keycode values within this range */
+	FX_KEY_RESERVED_START = 0xFFF00,
+	FX_KEY_RESERVED_END = 0xFFFFD,
+
 	FX_MOD_CTRL = 0x10000000,
 
 	FX_KEY_EOF = 0xFFFFFFFF,
@@ -153,6 +158,7 @@ FX_API void fx_tty_set_vmode(
 	struct fx_tty *tty,
 	const struct fx_tty_vmode *vmode);
 FX_API void fx_tty_reset_vmode(struct fx_tty *tty);
+FX_API void fx_tty_flush(struct fx_tty *tty);
 
 FX_API enum fx_status fx_tty_get_dimensions(
 	struct fx_tty *tty,

fx.term/sys/linux/tty.c

@@ -2,6 +2,7 @@
 
 #include "../../tty.h"
 
+#include <ctype.h>
 #include <fx/term/tty.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -103,6 +104,7 @@ static void init_tty(struct fx_tty *tty, FILE *in, FILE *out)
 
 	tcgetattr(fd, &tty->t_ios_default);
 	memcpy(&tty->t_ios_raw, &tty->t_ios_default, sizeof tty->t_ios_raw);
+	setvbuf(out, NULL, _IOLBF, 4096);
 
 	tty->t_ios_raw.c_iflag &= ~(ICRNL | IXON);
 	tty->t_ios_raw.c_oflag &= ~(OPOST);
@@ -207,8 +209,14 @@ void fx_tty_reset_vmode(struct fx_tty *tty)
 	tty->t_vmode.v_attrib = FX_TTY_ATTRIB_NORMAL;
 }
 
+void fx_tty_flush(struct fx_tty *tty)
+{
+	fflush(tty->t_out);
+}
+
 static int compare_colour(
-	const struct fx_tty_colour *a, const struct fx_tty_colour *b)
+	const struct fx_tty_colour *a,
+	const struct fx_tty_colour *b)
 {
 	if (a->c_mode != b->c_mode) {
 		return -1;
@@ -245,7 +253,9 @@ static int compare_colour(
 	return 0;
 }
 
-static int compare_vmode(const struct fx_tty_vmode *a, const struct fx_tty_vmode *b)
+static int compare_vmode(
+	const struct fx_tty_vmode *a,
+	const struct fx_tty_vmode *b)
 {
 	if (a->v_attrib != b->v_attrib) {
 		return -1;
@@ -273,7 +283,9 @@ static void put_ansi_attrib(struct fx_tty *tty, const char *s)
 }
 
 static void set_attrib(
-	struct fx_tty *tty, enum fx_tty_attrib old, enum fx_tty_attrib new)
+	struct fx_tty *tty,
+	enum fx_tty_attrib old,
+	enum fx_tty_attrib new)
 {
 	if (old == new) {
 		return;
@@ -311,7 +323,8 @@ static void set_attrib(
 }
 
 static void set_fg(
-	struct fx_tty *tty, const struct fx_tty_colour *old,
+	struct fx_tty *tty,
+	const struct fx_tty_colour *old,
 	const struct fx_tty_colour *new)
 {
 	if (compare_colour(old, new) == 0) {
@@ -347,7 +360,8 @@ static void set_fg(
 }
 
 static void set_bg(
-	struct fx_tty *tty, const struct fx_tty_colour *old,
+	struct fx_tty *tty,
+	const struct fx_tty_colour *old,
 	const struct fx_tty_colour *new)
 {
 	if (compare_colour(old, new) == 0) {
@@ -460,7 +474,10 @@ fx_keycode fx_tty_read_key(struct fx_tty *tty)
 	return c;
 }
 
-void fx_tty_move_cursor_x(struct fx_tty *tty, enum fx_tty_position_base base, int pos)
+void fx_tty_move_cursor_x(
+	struct fx_tty *tty,
+	enum fx_tty_position_base base,
+	int pos)
 {
 	if (base == FX_TTY_POS_CURSOR && pos < 0 && pos >= -4) {
 		for (int i = 0; i > pos; i--) {
@@ -489,7 +506,10 @@ void fx_tty_move_cursor_x(struct fx_tty *tty, enum fx_tty_position_base base, in
 	}
 }
 
-void fx_tty_move_cursor_y(struct fx_tty *tty, enum fx_tty_position_base base, int pos)
+void fx_tty_move_cursor_y(
+	struct fx_tty *tty,
+	enum fx_tty_position_base base,
+	int pos)
 {
 	if (base == FX_TTY_POS_START) {
 		/* we don't need this functionality right now */
@@ -530,7 +550,9 @@ void fx_tty_clear(struct fx_tty *tty, enum fx_tty_clear_mode mode)
 }
 
 enum fx_status fx_tty_get_dimensions(
-	struct fx_tty *tty, unsigned int *w, unsigned int *h)
+	struct fx_tty *tty,
+	unsigned int *w,
+	unsigned int *h)
 {
 	if (!(tty->t_flags & FX_TTY_INTERACTIVE)) {
 		return -1;
@@ -552,3 +574,62 @@ enum fx_status fx_tty_get_dimensions(
 
 	return 0;
 }
+
+enum fx_status fx_tty_get_cursor_position(
+	struct fx_tty *tty,
+	unsigned int *w,
+	unsigned int *h)
+{
+	if (!(tty->t_flags & FX_TTY_INTERACTIVE)) {
+		return -1;
+	}
+
+	int in_fd = fileno(tty->t_in);
+	int out_fd = fileno(tty->t_out);
+
+	write(out_fd, "\x1b[6n", 4);
+
+	char c;
+	read(in_fd, &c, 1);
+	read(in_fd, &c, 1);
+
+	char s[16] = {0};
+	for (int i = 0; i < sizeof s - 1; i++) {
+		read(in_fd, &c, 1);
+		if (!isdigit(c)) {
+			break;
+		}
+
+		s[i] = c;
+		s[i + 1] = 0;
+	}
+
+	if (w) {
+		if (s[0]) {
+			*w = atoi(s);
+		} else {
+			*w = 0;
+		}
+	}
+
+	s[0] = 0;
+	for (int i = 0; i < sizeof s - 1; i++) {
+		read(in_fd, &c, 1);
+		if (!isdigit(c)) {
+			break;
+		}
+
+		s[i] = c;
+		s[i + 1] = 0;
+	}
+
+	if (h) {
+		if (s[0]) {
+			*h = atoi(s);
+		} else {
+			*h = 0;
+		}
+	}
+
+	return 0;
+}