kubernetes/staging/src/k8s.io/cri-client/pkg/logs/tail.go

const blockSize …

// findTailLineStartIndex returns the start of last nth line.
// * If n < 0, return the beginning of the file.
// * If n >= 0, return the beginning of last nth line.
// Notice that if the last line is incomplete (no end-of-line), it will not be counted
// as one line.
func findTailLineStartIndex(f io.ReadSeeker, n int64) (int64, error) { … }