iio-monitor: fix Argument cannot be negative

The function `getmaxyx(win, row, col);` can return negative values if things are in a subwindow, and then these values are passed to the function `newwin`, which requires positive values. This sets up a potential error. Fix this by setting a min screen size (10 rows x 50 columns) to display content, and gracefully erroring if the size is too small. Signed-off-by: Robin Getz <[email protected]>
analogdevicesinc · Apr 24, 2020 · 973c61c · 973c61c
1 parent b31fc3e
commit 973c61c
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/examples/iio-monitor.c b/examples/iio-monitor.c
@@ -408,6 +408,15 @@ int main(void)
 	noecho();
 	keypad(win, TRUE);
 	getmaxyx(win, row, col);
+
+	/* If this was started from a small window, quit */
+	if (row < 10 || col < 50) {
+		endwin();
+		fprintf(stderr, "Sorry, I need a bigger window,\n"
+				"min is 10 x 50\n");
+		return 0;
+	}
+
 	initCDKColor();
 
 	left = newwin(row, col / 2, 0, 0);