scroll

commit 6f1e4abb64c2d4204c722d5357da004062f90b92
parent 177976ae00fc60658c6f21739a3fd2462a02917f
Author: Jochen Sprickerhof <git@jochen.sprickerhof.de>
Date:   Wed, 15 Apr 2020 23:08:35 +0200

Error handling for getcursorposition

Diffstat:
M
scroll.c
 | 
13
++++++++++---

1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/scroll.c b/scroll.c
@@ -254,10 +254,17 @@ void
 getcursorposition(int *x, int *y)
 {
 	char input[BUFSIZ];
-	write(STDOUT_FILENO, "\033[6n", 4);
-	ssize_t n = read(STDIN_FILENO, input, sizeof(input)-1);
+	ssize_t n;
+
+	if (write(STDOUT_FILENO, "\033[6n", 4) < 0)
+		die("requesting cursor position");
+
+	if ((n = read(STDIN_FILENO, input, sizeof(input)-1)) < 0)
+		die("reading cursor position");
 	input[n] = '\0';
-	sscanf(input, "\033[%d;%dR", x, y);
+
+	if (sscanf(input, "\033[%d;%dR", x, y) != 2)
+		die("parsing cursor position");
 }
 
 void