mqtt_topic_match.h

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#pragma once
 
namespace esphome::mqtt {
 
inline bool topic_match(const char *message, const char *subscription) {
  // First-level wildcards do not match topics that begin with '$'
  bool wildcards = *message != '$';
  while (*message != '\0' && *subscription != '\0') {
    if (wildcards && *subscription == '#')
      return true;
    if (wildcards && *subscription == '+') {
      subscription++;
      while (*message != '\0' && *message != '/')
        message++;
      continue;
    }
    if (*message != *subscription)
      return false;
    wildcards |= *subscription == '/';
    message++;
    subscription++;
  }
  return *message == *subscription;  // a match only if both ended
}
 
}  // namespace esphome::mqtt