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#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <stdlib.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;
const char *z;
unsigned long x;
int i, j, v, d, brk=-1, need_v4=0;
/* Reimplement this because inet_pton cannot accept special v4 forms */
if (af==AF_INET) {
for (i=0; i<4 && *s; i++) {
a[i] = x = strtoul(s, (char **)&z, 10);
if (!isdigit(*s) || z==s || (*z && *z != '.') || x>255)
return 0;
s=z+1;
}
return 1;
} else if (af!=AF_INET6) {
errno = EAFNOSUPPORT;
return -1;
}
if (s[0]==':' && s[1]==':') s++;
for (i=0; ; i++, s+=j+1) {
if (s[0]==':' && brk<0) {
brk=i;
j=0;
ip[i]=0;
if (!s[1]) break;
continue;
}
if (hexval(s[0])<0) return -1;
while (s[0]=='0' && s[1]=='0') s++;
for (v=j=0; j<5 && (d=hexval(s[j]))>=0; j++)
v=16*v+d;
if (v > 65535) return -1;
ip[i] = v;
if (!s[j]) {
if (brk<0 && i!=7) return -1;
break;
}
if (i<7) {
if (s[j]==':') continue;
if (s[j]!='.') return -1;
need_v4=1;
i++;
break;
}
return -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 -1;
return 1;
}
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