Function normalize_reference

src/references.c:22–45

normalize reference: collapse internal whitespace to single space, remove leading/trailing whitespace, case fold Return NULL if the reference name is actually empty (i.e. composed solely from whitespace)

// Return NULL if the reference name is actually empty (i.e. composed
// solely from whitespace)
static unsigned char *normalize_reference(cmark_mem *mem, cmark_chunk *ref) {
  cmark_strbuf normalized = CMARK_BUF_INIT(mem);
  unsigned char *result;

  if (ref == NULL)
    return NULL;

  if (ref->len == 0)
    return NULL;

  cmark_utf8proc_case_fold(&normalized, ref->data, ref->len);
  cmark_strbuf_trim(&normalized);
  cmark_strbuf_normalize_whitespace(&normalized);

  result = cmark_strbuf_detach(&normalized);
  assert(result);

  if (result[0] == '\0') {
    mem->free(result);
    return NULL;
  }

  return result;
}

void cmark_reference_create(cmark_reference_map *map, cmark_chunk *label,
                            cmark_chunk *url, cmark_chunk *title) {