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#include <arpa/inet.h>
extern char *inet_ntoa_r(struct in_addr in,char* buf);
static const unsigned char V4mappedprefix[12]={0,0,0,0,0,0,0,0,0,0,0xff,0xff};
static char tohex(char hexdigit) {
return hexdigit>9?hexdigit+'a'-10:hexdigit+'0';
}
static int fmt_xlong(char* s,unsigned int i) {
char* bak=s;
*s=tohex((i>>12)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex((i>>8)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex((i>>4)&0xf); if (s!=bak || *s!='0') ++s;
*s=tohex(i&0xf);
return s-bak+1;
}
unsigned int fmt_ip6(char *s,const char ip[16])
{
unsigned int len;
unsigned int i;
unsigned int temp;
unsigned int compressing;
int j;
len = 0; compressing = 0;
for (j=0; j<16; j+=2) {
if (j==12 && !memcmp(ip,V4mappedprefix,12)) {
inet_ntoa_r(*(struct in_addr*)(ip+12),s);
temp=strlen(s);
return len+temp;
}
temp = ((unsigned long) (unsigned char) ip[j] << 8) +
(unsigned long) (unsigned char) ip[j+1];
if (temp == 0) {
if (!compressing) {
compressing=1;
if (j==0) {
*s++=':'; ++len;
}
}
} else {
if (compressing) {
compressing=0;
*s++=':'; ++len;
}
i = fmt_xlong(s,temp); len += i; s += i;
if (j<14) {
*s++ = ':';
++len;
}
}
}
*s=0;
return len;
}
const char* inet_ntop(int AF, const void *CP, char *BUF, size_t LEN) {
char buf[100];
int len;
if (AF==AF_INET) {
inet_ntoa_r(*(struct in_addr*)CP,buf);
len=strlen(buf);
} else if (AF==AF_INET6) {
len=fmt_ip6(buf,CP);
} else
return 0;
if (len<LEN) {
strcpy(BUF,buf);
return BUF;
}
return 0;
}
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