Function lineColAt

lib/redact-engine.ts:155–167

(original: string, offset: number)

// ── Offset → line/col on the ORIGINAL text ────────────────────────────────────

function lineColAt(original: string, offset: number): { line: number; col: number } {
  let line = 1;
  let col = 1;
  for (let i = 0; i < offset && i < original.length; i++) {
    if (original[i] === "\n") {
      line += 1;
      col = 1;
    } else {
      col += 1;
    }
  }
  return { line, col };
}

// ── Safe preview masking ──────────────────────────────────────────────────────