Function does_language_range_match

src/iocore/cache/HttpTransactCache.cc:1052–1066

Match request Accept-Language with response Content-Language. Language matching is a little more complicated because of "ranges". First, no Accept-Language header or no Content-Language headers match with q of 1. Otherwise, loop over Content-Languages. If there is a match with a language in the Accept-Language field, keep track of how many characters were in the value. The q value for t

*/
static inline bool
does_language_range_match(const char *range1, const char *range2)
{
  while (*range1 && *range2 && (ParseRules::ink_tolower(*range1) == ParseRules::ink_tolower(*range2))) {
    range1 += 1;
    range2 += 1;
  }

  // matches if range equals tag, or if range is a lang prefix of tag
  if ((((*range1 == NUL) && (*range2 == NUL)) || ((*range1 == NUL) && (*range2 == '-')))) {
    return true;
  }

  return false;
}

static inline bool
match_accept_content_language(const char *c_raw, MIMEField *accept_field, bool *wildcard_present, float *wildcard_q, float *q,