-- with format.len + 1 ---

Breakpoint 1, interop.timeAsString (buf=..., format=...) at interop.zig:75
75          return buf[0..len];
(gdb) p buf
$1 = {ptr = 0x7ffff7b80280 "04:52:27pm", len = 11}
(gdb) up
#1  0x0000000001160978 in main.main () at main.zig:486
486                         const clock_str = interop.timeAsString(clock_buf.items[0..clock_buf.items.len-1:0], format) catch {
(gdb) list
481                         const yo = (buffer.height - buffer.box_height) / 2 - bigclock.HEIGHT - 2;
482                         var clock_buf = std.ArrayList(u8).init(allocator);
483                         try clock_buf.resize(format.len + 1);
484                         try clock_buf.append(@as(u8, 0));
485                         defer clock_buf.deinit();
486                         const clock_str = interop.timeAsString(clock_buf.items[0..clock_buf.items.len-1:0], format) catch {
487                             break :draw_big_clock;
488                         };
489
490                         for (clock_str, 0..) |c, i| {
(gdb)

-- with only format.len ---

Breakpoint 1, interop.timeAsString (buf=..., format=...) at interop.zig:75
75          return buf[0..len];
(gdb) p buf
$1 = {ptr = 0x7ffff7b80280 "04:55:29\252\252", len = 10}
(gdb) up
#1  0x0000000001160953 in main.main () at main.zig:486
486                         const clock_str = interop.timeAsString(clock_buf.items[0..clock_buf.items.len-1:0], format) catch {
(gdb) list
481                         const yo = (buffer.height - buffer.box_height) / 2 - bigclock.HEIGHT - 2;
482                         var clock_buf = std.ArrayList(u8).init(allocator);
483                         try clock_buf.resize(format.len);
484                         try clock_buf.append(@as(u8, 0));
485                         defer clock_buf.deinit();
486                         const clock_str = interop.timeAsString(clock_buf.items[0..clock_buf.items.len-1:0], format) catch {
487                             break :draw_big_clock;
488                         };
489
490                         for (clock_str, 0..) |c, i| {
(gdb)