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#include <sys/socket.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
static int hexval(unsigned c)
{
if (c-'0'<10) return c-'0';
c |= 32;
if (c-'a'<6) return c-'a'+10;
return -1;
}
int inet_pton(int af, const char *restrict s, void *restrict a0)
{
uint16_t ip[8];
unsigned char *a = a0;
int i, j, v, d, brk=-1, need_v4=0;
if (af==AF_INET) {
for (i=0; i<4; i++) {
for (v=j=0; j<3 && isdigit(s[j]); j++)
v = 10*v + s[j]-'0';
if (j==0 || (j>1 && s[0]=='0') || v>255) return 0;
a[i] = v;
if (s[j]==0 && i==3) return 1;
if (s[j]!='.') return 0;
s += j+1;
}
return 0;
} else if (af!=AF_INET6) {
errno = EAFNOSUPPORT;
return -1;
}
if (*s==':' && *++s!=':') return 0;
for (i=0; ; i++) {
if (s[0]==':' && brk<0) {
brk=i;
ip[i&7]=0;
if (!*++s) break;
if (i==7) return 0;
continue;
}
for (v=j=0; j<4 && (d=hexval(s[j]))>=0; j++)
v=16*v+d;
if (j==0) return 0;
ip[i&7] = v;
if (!s[j] && (brk>=0 || i==7)) break;
if (i==7) return 0;
if (s[j]!=':') {
if (s[j]!='.' || (i<6 && brk<0)) return 0;
need_v4=1;
i++;
ip[i&7]=0;
break;
}
s += j+1;
}
if (brk>=0) {
memmove(ip+brk+7-i, ip+brk, 2*(i+1-brk));
for (j=0; j<7-i; j++) ip[brk+j] = 0;
}
for (j=0; j<8; j++) {
*a++ = ip[j]>>8;
*a++ = ip[j];
}
if (need_v4 && inet_pton(AF_INET, (void *)s, a-4) <= 0) return 0;
return 1;
}
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