interactive: Fix wipe_bottom_line() on MacOS.

[paraslash.git] / interactive.c

diff --git a/interactive.c b/interactive.c
index f75e4be531d94521bf87f8baf19b5f4dfb5b6739..7768d36b08ec716718b58396e90549722336f7be 100644 (file)
--- a/interactive.c
+++ b/interactive.c
@@ -187,7 +187,26 @@ void i9e_attach_to_stdout(struct btr_node *producer)
 
 static void wipe_bottom_line(void)
 {
-       fprintf(i9ep->stderr_stream, "\r%s\r", i9ep->empty_line);
+       char x[] = "          ";
+       int n = i9ep->num_columns;
+
+       /*
+        * For reasons beyond my understanding, writing more than 68 characters
+        * here causes MacOS to mess up the terminal. Writing a line of spaces
+        * in smaller chunks works fine though. Weird.
+        */
+       fprintf(i9ep->stderr_stream, "\r");
+       while (n > 0) {
+               if (n >= sizeof(x)) {
+                       fprintf(i9ep->stderr_stream, "%s", x);
+                       n -= sizeof(x);
+                       continue;
+               }
+               x[n] = '\0';
+               fprintf(i9ep->stderr_stream, "%s", x);
+               break;
+       }
+       fprintf(i9ep->stderr_stream, "\r");
 }
 
 /**