termptyesc: _csi_arg_get() now correctly handles missing arguments

Only affects when multiple ones were expected

src/bin/termptyesc.c

@@ -96,9 +96,17 @@ _csi_arg_get(Eina_Unicode **ptr)
    if (!b)
      goto error;
 
-   while ((*b) && (*b < '0' || *b > '9'))
+   /* Skip potential '?', '>'.... */
+   while ((*b) && ( (*b) != ';' && ((*b) < '0' || (*b) > '9')))
      b++;
 
+   if (*b == ';')
+     {
+        b++;
+        *ptr = b;
+        return -1;
+     }
+
    if (!*b)
      goto error;
 
@@ -111,6 +119,11 @@ _csi_arg_get(Eina_Unicode **ptr)
         b++;
      }
 
+   if (*b == ';')
+     {
+        b++;
+     }
+
    *ptr = b;
    return sum;