//go:build !windows

package host

import "syscall"

// diskBytes reports the total and available bytes of the filesystem holding
// dir.
//
// It returns BYTES, not the raw statfs fields, and that is the point: Bsize
// is int64 on Linux and uint32 on darwin, a difference that already broke
// the CI build once (see .amadan/ci.d/20-cross@5's header) because the
// multiplication happened at every call site instead of once here. Callers
// now get two plain uint64s and no per-OS arithmetic.
func diskBytes(dir string) (total, avail uint64, err error) {
	var st syscall.Statfs_t
	if err := syscall.Statfs(dir, &st); err != nil {
		return 0, 0, err
	}
	return uint64(st.Blocks) * uint64(st.Bsize), uint64(st.Bavail) * uint64(st.Bsize), nil
}