+typedef union irc_in_addr {
+ uint32_t in6_32[4];
+ uint16_t in6[8];
+ uint8_t in6_8[16];
+} irc_in_addr_t;
+
+#define irc_in_addr_is_valid(ADDR) (((ADDR).in6[0] && (ADDR).in6[0] != 65535) \
+ || (ADDR).in6[1] != (ADDR).in6[0] \
+ || (ADDR).in6[2] != (ADDR).in6[0] \
+ || (ADDR).in6[3] != (ADDR).in6[0] \
+ || (ADDR).in6[4] != (ADDR).in6[0] \
+ || (ADDR).in6[5] != (ADDR).in6[0] \
+ || (ADDR).in6[6] != (ADDR).in6[0] \
+ || (ADDR).in6[7] != (ADDR).in6[0])
+#define irc_in_addr_is_ipv4(ADDR) (!(ADDR).in6[0] && !(ADDR).in6[1] \
+ && !(ADDR).in6[2] && !(ADDR).in6[3] \
+ && !(ADDR).in6[4] && (ADDR).in6[6] \
+ && (!(ADDR).in6[5] || (ADDR).in6[5] == 65535))
+#define irc_in_addr_is_ipv6(ADDR) !irc_in_addr_is_ipv4(ADDR)
+#define irc_in_addr_is_loopback(ADDR) (irc_in_addr_is_ipv4(ADDR) ? (ADDR).in6_8[12] == 127 \
+ : (ADDR).in6[0] == 0 && (ADDR).in6[1] == 0 \
+ && (ADDR).in6[2] == 0 && (ADDR).in6[3] == 0 \
+ && (ADDR).in6[4] == 0 && (ADDR).in6[5] == 0 \
+ && (ADDR).in6[6] == 0 && (ADDR).in6[7] == 1)
+#define IRC_NTOP_MAX_SIZE 40
+unsigned int irc_ntop(char *output, unsigned int out_size, const irc_in_addr_t *addr);
+#define IRC_NTOP_MASK_MAX_SIZE (IRC_NTOP_MAX_SIZE + 4)
+unsigned int irc_ntop_mask(char *output, unsigned int out_size, const irc_in_addr_t *addr, unsigned char bits);
+unsigned int irc_pton(irc_in_addr_t *addr, unsigned char *bits, const char *input);
+unsigned int irc_check_mask(const irc_in_addr_t *check, const irc_in_addr_t *mask, unsigned char bits);
+const char *irc_ntoa(const irc_in_addr_t *addr);
+