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terminal: fix uninitialized memory in Cell init

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This commit is contained in:
Mitchell Hashimoto
2025-08-20 20:15:47 -07:00
parent 3ce043123b
commit be51f3e729
1 changed files with 7 additions and 4 deletions
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11
src/terminal/page.zig
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@@ -2043,10 +2043,13 @@ pub const Cell = packed struct(u64) {
/// Helper to make a cell that just has a codepoint.
pub fn init(cp: u21) Cell {
return .{
.content_tag = .codepoint,
.content = .{ .codepoint = cp },
};
// We have to use this bitCast here to ensure that our memory is
// zeroed. Otherwise, the content below will leave some uninitialized
// memory in the packed union. Valgrind verifies this.
var cell: Cell = @bitCast(@as(u64, 0));
cell.content_tag = .codepoint;
cell.content = .{ .codepoint = cp };
return cell;
}
pub fn isZero(self: Cell) bool {