fx.term: tty: implement get_cursor_position() on apple

fx.term/sys/apple/tty.c

@@ -1,6 +1,8 @@
+#define _POSIX_C_SOURCE 200809L
+
 #include "../../tty.h"
 
-#include <fx/encoding.h>
+#include <ctype.h>
 #include <fx/term/tty.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -102,11 +104,11 @@ 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 &= ~(BRKINT | INPCK | ISTRIP | ICRNL | IXON);
+	tty->t_ios_raw.c_iflag &= ~(ICRNL | IXON);
 	tty->t_ios_raw.c_oflag &= ~(OPOST);
-	tty->t_ios_raw.c_cflag |= (CS8);
+	tty->t_ios_raw.c_lflag &= ~(ECHO | ICANON | IEXTEN);
-	tty->t_ios_raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
 
 	tty->t_flags |= FX_TTY_INIT;
 }
@@ -207,6 +209,11 @@ 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)
@@ -408,24 +415,6 @@ void fx_tty_set_vmode(struct fx_tty *tty, const struct fx_tty_vmode *vmode)
 	memcpy(&tty->t_vmode, vmode, sizeof *vmode);
 }
 
-static fx_keycode read_utf8(int fd, char header, int len)
-{
-	char s[4] = {header, 0, 0, 0};
-
-	for (int i = 1; i < len; i++) {
-		char c;
-		int v = read(fd, &c, 1);
-
-		if (v != 1) {
-			return FX_KEY_EOF;
-		}
-
-		s[i] = c;
-	}
-
-	return fx_wchar_utf8_codepoint_decode(s);
-}
-
 fx_keycode fx_tty_read_key(struct fx_tty *tty)
 {
 	char c;
@@ -450,11 +439,6 @@ fx_keycode fx_tty_read_key(struct fx_tty *tty)
 			return FX_TTY_CTRL_KEY(c + 'a' - 1);
 		}
 
-		int utf8_len = fx_wchar_utf8_header_decode(c);
-		if (utf8_len > 1) {
-			return read_utf8(fd, c, utf8_len);
-		}
-
 		if (c != 0x1b) {
 			return c;
 		}
@@ -590,3 +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;
+}