Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
#include "byte.h"
#include "ip4.h"
#include "ip6.h"
size_t fmt_ip6(char *s,const char ip[16])
{
unsigned long temp;
size_t len, k, pos0=0,len0=0, pos1=0, compr=0;
for (k=0; k<16; k+=2) {
if (ip[k]==0 && ip[k+1]==0) {
if (!compr) {
compr=1;
pos1=k;
}
if (k==14) { k=16; goto last; }
} else if (compr) {
last:
if ((temp=k-pos1) > len0) {
len0=temp;
pos0=pos1;
}
compr=0;
}
}
for (len=0,k=0; k<16; k+=2) {
if (k==12 && ip6_isv4mapped(ip)) {
len += ip4_fmt(s,ip+12);
break;
}
if (pos0==k && len0) {
if (k==0) { ++len; if (s) *s++ = ':'; }
++len; if (s) *s++ = ':';
k += len0-2;
continue;
}
temp = ((unsigned long) (unsigned char) ip[k] << 8) +
(unsigned long) (unsigned char) ip[k+1];
temp = fmt_xlong(s,temp); len += temp; if (s) s += temp;
if (k<14) { ++len; if (s) *s++ = ':'; }
}
return len;
}