text: /*
  Copyright (c) 2007, 2008 by Juliusz Chroboczek
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  */
  
  #if defined(i386) || defined(__mc68020__) || defined(__x86_64__)
  #define DO_NTOHS(_d, _s) do{ _d = ntohs(*(const unsigned short*)(_s)); }while(0)
  #define DO_NTOHL(_d, _s) do{ _d = ntohl(*(const unsigned*)(_s)); } while(0)
  #define DO_HTONS(_d, _s) do{ *(unsigned short*)(_d) = htons(_s); } while(0)
  #define DO_HTONL(_d, _s) do{ *(unsigned*)(_d) = htonl(_s); } while(0)
  /* Some versions of gcc seem to be buggy, and ignore the packed attribute.
     Disable this code until the issue is clarified. */
  /* #elif defined __GNUC__*/
  #else
  #define DO_NTOHS(_d, _s) \
      do { short _dd; \
           memcpy(&(_dd), (_s), 2); \
           _d = ntohs(_dd); } while(0)
  #define DO_NTOHL(_d, _s) \
      do { int _dd; \
           memcpy(&(_dd), (_s), 4); \
           _d = ntohl(_dd); } while(0)
  #define DO_HTONS(_d, _s) \
      do { unsigned short _dd; \
           _dd = htons(_s); \
           memcpy((_d), &(_dd), 2); } while(0)
  #define DO_HTONL(_d, _s) \
      do { unsigned _dd; \
           _dd = htonl(_s); \
           memcpy((_d), &(_dd), 4); } while(0)
  #endif
  
  static inline int
  seqno_compare(unsigned short s1, unsigned short s2)
  {
      if(s1 == s2)
          return 0;
      else
          return ((s2 - s1) & 0x8000) ? 1 : -1;
  }
  
  static inline short
  seqno_minus(unsigned short s1, unsigned short s2)
  {
      return (short)((s1 - s2) & 0xFFFF);
  }
  
  static inline unsigned short
  seqno_plus(unsigned short s, int plus)
  {
      return ((s + plus) & 0xFFFF);
  }
  
  /* Returns a time in microseconds on 32 bits (thus modulo 2^32,
     i.e. about 4295 seconds). */
  static inline unsigned int
  time_us(const struct timeval t)
  {
      return (unsigned int) (t.tv_sec * 1000000 + t.tv_usec);
  }
  
  int roughly(int value);
  void timeval_minus(struct timeval *d,
                     const struct timeval *s1, const struct timeval *s2);
  unsigned timeval_minus_msec(const struct timeval *s1, const struct timeval *s2)
      ATTRIBUTE ((pure));
  void timeval_add_msec(struct timeval *d,
                        const struct timeval *s, int msecs);
  int timeval_compare(const struct timeval *s1, const struct timeval *s2)
      ATTRIBUTE ((pure));
  void timeval_min(struct timeval *d, const struct timeval *s);
  void timeval_min_sec(struct timeval *d, time_t secs);
  int parse_nat(const char *string) ATTRIBUTE ((pure));
  int parse_thousands(const char *string) ATTRIBUTE ((pure));
  void do_debugf(int level, const char *format, ...)
      ATTRIBUTE ((format (printf, 2, 3))) COLD;
  int in_prefix(const unsigned char *restrict address,
                const unsigned char *restrict prefix, unsigned char plen)
      ATTRIBUTE ((pure));
  unsigned char *mask_prefix(unsigned char *restrict ret,
                             const unsigned char *restrict prefix,
                             unsigned char plen);
  const char *format_address(const unsigned char *address);
  const char *format_prefix(const unsigned char *address, unsigned char prefix);
  const char *format_eui64(const unsigned char *eui);
  const char *format_thousands(unsigned int value);
  int parse_address(const char *address, unsigned char *addr_r, int *af_r);
  int parse_net(const char *net, unsigned char *prefix_r, unsigned char *plen_r,
                int *af_r);
  int parse_eui64(const char *eui, unsigned char *eui_r);
  int wait_for_fd(int direction, int fd, int msecs);
  int martian_prefix(const unsigned char *prefix, int plen) ATTRIBUTE ((pure));
  int linklocal(const unsigned char *address) ATTRIBUTE ((pure));
  int v4mapped(const unsigned char *address) ATTRIBUTE ((pure));
  void v4tov6(unsigned char *dst, const unsigned char *src);
  int daemonise(void);
  int set_src_prefix(unsigned char *src_addr, unsigned char *src_plen);
  
  enum prefix_status {
      PST_DISJOINT      = 1 << 0,
      PST_EQUALS        = 1 << 1,
      PST_MORE_SPECIFIC = 1 << 2,
      PST_LESS_SPECIFIC = 1 << 3,
  };
  enum prefix_status
  prefix_cmp(const unsigned char *p1, unsigned char plen1,
             const unsigned char *p2, unsigned char plen2);
  
  /* If debugging is disabled, we want to avoid calling format_address
     for every omitted debugging message.  So debug is a macro.  But
     vararg macros are not portable. */
  #if defined NO_DEBUG
  
  #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
  #define debugf(...) do {} while(0)
  #define kdebugf(...) do {} while(0)
  #elif defined __GNUC__
  #define debugf(_args...) do {} while(0)
  #define kdebugf(_args...) do {} while(0)
  #else
  static inline void debugf(const char *format, ...) { return; }
  static inline void kdebugf(const char *format, ...) { return; }
  #endif
  
  #else
  
  #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
  #define debugf(...) \
      do { \
          if(UNLIKELY(debug >= 2)) do_debugf(2, __VA_ARGS__);     \
      } while(0)
  #define kdebugf(...) \
      do { \
          if(UNLIKELY(debug >= 3)) do_debugf(3, __VA_ARGS__);     \
      } while(0)
  #elif defined __GNUC__
  #define debugf(_args...) \
      do { \
          if(UNLIKELY(debug >= 2)) do_debugf(2, _args);   \
      } while(0)
  #define kdebugf(_args...) \
      do { \
          if(UNLIKELY(debug >= 3)) do_debugf(3, _args);   \
      } while(0)
  #else
  static inline void debugf(const char *format, ...) { return; }
  static inline void kdebugf(const char *format, ...) { return; }
  #endif
  
  #endif
  
  