scan_ip6 - parse an IPv6 number and interface in ASCII representation

       scan_ip6if  parses an IPv6 number in RFC1884 ASCII representation from src and writes the result into ip.
       If the IPv6 number is followed by the percent sign, scan_ip6if takes the word following  that,  tries  to
       parse it as network interface and writes the result to scope_id.

       It returns the number of bytes read from src or 0 if the parsing failed.

       scan_ip6if  accepts  upper  and  lower case hex letters, it understands "::" compression and partial IPv4
       addresses as in "::FFFF:129.144.52.38".

       To allow transparent usage of IPv4 in IPv6 applications, scan_ip6if also understands  IPv4  addresses  in
       dotted-decimal  notation  and will return an IPv4-mapped IPv6 address (i.e. "127.0.0.1" will be parsed as
       "::FFFF:127.0.0.1".

       Unlike many other IP  parsing  routines,  scan_ip6if  does  not  recognize  octal  (like  0177.0.0.1)  or
       hexadecimal numbers (like 0x7f000001) in the IPv4 part.

       #include <libowfat/str.h>
       #include <libowfat/ip6.h>

         char buf[]="::1%lo";
         char ip[16];
         uint32 scope_id;
         if (scan_ip6if(buf,ip,&scope_id) != str_len(buf))
           parse_error();

       scan_ip6 - parse an IPv6 number and interface in ASCII representation

fmt_ip6(3), scan_ip4(3), fmt_ip6if(3)

                                                                                                   scan_ip6if(3)

#include<libowfat/ip6.h>

       int scan_ip6if(const char *src,char ip[16],uint32* scope_id);