Method readSync

io/buffer.ts:244–257

* Reads the next `p.length` bytes from the buffer or until the buffer is * drained. Returns the number of bytes read. If the buffer has no data to * return, the return is EOF (`null`). * * @example Usage * ```ts * import { Buffer } from "@std/io/buffer"; * import { assertEquals

(p: Uint8Array)

   * @returns The number of bytes read.
   */
  readSync(p: Uint8Array): number | null {
    if (this.empty()) {
      // Buffer is empty, reset to recover space.
      this.reset();
      if (p.byteLength === 0) {
        // this edge case is tested in 'bufferReadEmptyAtEOF' test
        return 0;
      }
      return null;
    }
    const nread = copy(this.#buf.subarray(this.#off), p);
    this.#off += nread;
    return nread;
  }

  /**
   * Reads the next `p.length` bytes from the buffer or until the buffer is