fmt_ip6if - write a formatted ASCII representation of an IPv6 number

       fmt_ip6if  formats  an  IPv6  number  in ASCII representation from ip and writes the result into dest. It
       returns the number of bytes written.

       fmt_ip6if will apply "::" compression to the output.

       If ip is an IPv4-mapped IPv6 address, fmt_ip6if will output the last 4 bytes as IPv4  number  in  dotted-
       decimal notation.

       If dest equals FMT_LEN (i.e. is zero), fmt_ip6if returns the number of bytes it would have written.

       fmt_ip6 does not append \0.

       ip6.h  defines  the  integer  IP6_FMT  to be big enough to contain every possible fmt_ip6 output plus \0.
       However, for fmt_ip6if you need to add 1 for the '%' and IF_NAMESIZE from <net/if.h>  for  the  interface
       name.

       #include <libowfat/ip6.h>

         char buf[IP6_FMT];
         char ip[16];
         scope_id sid;
         buf[fmt_ip6if(buf,ip,sid)]=0;

       fmt_ip6if - write a formatted ASCII representation of an IPv6 number

scan_ip6(3), fmt_ip4(3)

                                                                                                    fmt_ip6if(3)

#include<libowfat/ip6.h>

       unsigned int fmt_ip6if(char *dest,const char ip[16],uint32 scope_id);