fix(getTerminalSize): return default size if cols and rows are 0

commit: 651dd7c
parent: a22dba5
author: Eric Bower
date: 2025-12-11 13:01:31 -0500 EST

fix(getTerminalSize): return default size if cols and rows are 0

The issue is that `getTerminalSize` can return 0x0 even when ioctl(TIOCGWINSZ) succeeds. The ghostty terminal library panics when initialized with zero dimensions.

The fix in `getTerminalSize` now validates that both rows and cols are positive before using them, otherwise falling back to the default 24x80.

Closes: https://github.com/neurosnap/zmx/issues/25

2 files changed, +1, -3

M build.zig

M src/main.zig

M build.zig

+0, -2

1@@ -147,5 +147,3 @@ pub fn build(b: *std.Build) void {
2     upload_step.dependOn(&rsync_docs.step);
3     upload_step.dependOn(&rsync_dist.step);
4 }
5-
6-

M src/main.zig

+1, -1

1@@ -1020,7 +1020,7 @@ fn setupSigwinchHandler() void {
2 
3 fn getTerminalSize(fd: i32) ipc.Resize {
4     var ws: c.struct_winsize = undefined;
5-    if (c.ioctl(fd, c.TIOCGWINSZ, &ws) == 0) {
6+    if (c.ioctl(fd, c.TIOCGWINSZ, &ws) == 0 and ws.ws_row > 0 and ws.ws_col > 0) {
7         return .{ .rows = ws.ws_row, .cols = ws.ws_col };
8     }
9     return .{ .rows = 24, .cols = 80 };