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terminal: add helpers to BitmapAllocator for sizing

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This commit is contained in:
Mitchell Hashimoto
2026-01-29 10:23:54 -08:00
parent 9b75f4a799
commit 51ce210833
2 changed files with 21 additions and 20 deletions
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14
src/terminal/bitmap_allocator.zig
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@@ -147,6 +147,20 @@ pub fn BitmapAllocator(comptime chunk_size: comptime_int) type {
}
}
/// Returns the total capacity in bytes.
pub fn capacityBytes(self: Self) usize {
return self.bitmap_count * bitmap_bit_size * chunk_size;
}
/// Returns the number of bytes currently in use.
pub fn usedBytes(self: Self, base: anytype) usize {
const bitmaps = self.bitmap.ptr(base);
var free_chunks: usize = 0;
for (bitmaps[0..self.bitmap_count]) |bitmap| free_chunks += @popCount(bitmap);
const total_chunks = self.bitmap_count * bitmap_bit_size;
return (total_chunks - free_chunks) * chunk_size;
}
/// For testing only.
fn isAllocated(self: *Self, base: anytype, slice: anytype) bool {
comptime assert(@import("builtin").is_test);