Function skip_n_req

libCacheSim/traceReader/reader.c:456–484

* skip the next following N elements in the trace, * @param reader * @param N * @return the number of elements that are actually skipped */

 * @return the number of elements that are actually skipped
 */
int skip_n_req(reader_t *reader, const int N) {
  int count = N;
  char **buf = &reader->line_buf;
  size_t *buf_size_ptr = &reader->line_buf_size;

  if (reader->trace_format == TXT_TRACE_FORMAT) {
    for (int i = 0; i < N; i++) {
      if (getline(buf, buf_size_ptr, reader->file) == -1) {
        WARN("try to skip %d requests, but only %d requests left\n", N, i);
        return i;
      }
    }
  } else if (reader->trace_format == BINARY_TRACE_FORMAT) {
    if (reader->mmap_offset + N * reader->item_size <= reader->file_size) {
      reader->mmap_offset = reader->mmap_offset + N * reader->item_size;
    } else {
      count = (reader->file_size - reader->mmap_offset) / reader->item_size;
      reader->mmap_offset = reader->file_size;
      WARN("try to skip %d requests, but only %d requests left\n", N, count);
    }
  } else {
    ERROR("unknown trace format %d\n", reader->trace_format);
    abort();
  }

  VERBOSE("skip %d requests\n", count);

  return count;
}

void reset_reader(reader_t *const reader) {
  /* rewind the reader back to beginning */