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49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#include "fmt.h"
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#include "byte.h"
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#include "ip4.h"
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#include "ip6.h"
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size_t fmt_ip6(char *s,const char ip[16])
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{
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unsigned long temp;
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size_t len, k, pos0=0,len0=0, pos1=0, compr=0;
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for (k=0; k<16; k+=2) {
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if (ip[k]==0 && ip[k+1]==0) {
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if (!compr) {
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if (k<=14 && ip[k+2]==0 && ip[k+3]==0) {
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compr=1;
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pos1=k;
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}
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}
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if (k==14) { k=16; goto last; }
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} else if (compr) {
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last:
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if ((temp=k-pos1) > len0) {
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len0=temp;
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pos0=pos1;
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}
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compr=0;
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}
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}
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for (len=0,k=0; k<16; k+=2) {
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if (k==12 && ip6_isv4mapped(ip)) {
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len += ip4_fmt(s,ip+12);
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break;
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}
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if (pos0==k && len0) {
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if (k==0) { ++len; if (s) *s++ = ':'; }
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++len; if (s) *s++ = ':';
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k += len0-2;
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continue;
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}
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temp = ((unsigned long) (unsigned char) ip[k] << 8) +
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(unsigned long) (unsigned char) ip[k+1];
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temp = fmt_xlong(s,temp); len += temp; if (s) s += temp;
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if (k<14) { ++len; if (s) *s++ = ':'; }
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}
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return len;
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}
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