1#include <sys/socket.h>
2#include <arpa/inet.h>
3#include <ctype.h>
4#include <errno.h>
5#include <string.h>
6
7static int hexval(unsigned c)
8{
9 if (c-'0'<10) return c-'0';
10 c |= 32;
11 if (c-'a'<6) return c-'a'+10;
12 return -1;
13}
14
15int inet_pton(int af, const char *restrict s, void *restrict a0)
16{
17 uint16_t ip[8];
18 unsigned char *a = a0;
19 int i, j, v, d, brk=-1, need_v4=0;
20
21 if (af==AF_INET) {
22 for (i=0; i<4; i++) {
23 for (v=j=0; j<3 && isdigit(s[j]); j++)
24 v = 10*v + s[j]-'0';
25 if (j==0 || (j>1 && s[0]=='0') || v>255) return 0;
26 a[i] = v;
27 if (s[j]==0 && i==3) return 1;
28 if (s[j]!='.') return 0;
29 s += j+1;
30 }
31 return 0;
32 } else if (af!=AF_INET6) {
33 errno = EAFNOSUPPORT;
34 return -1;
35 }
36
37 if (*s==':' && *++s!=':') return 0;
38
39 for (i=0; ; i++) {
40 if (s[0]==':' && brk<0) {
41 brk=i;
42 ip[i&7]=0;
43 if (!*++s) break;
44 if (i==7) return 0;
45 continue;
46 }
47 for (v=j=0; j<4 && (d=hexval(s[j]))>=0; j++)
48 v=16*v+d;
49 if (j==0) return 0;
50 ip[i&7] = v;
51 if (!s[j] && (brk>=0 || i==7)) break;
52 if (i==7) return 0;
53 if (s[j]!=':') {
54 if (s[j]!='.' || (i<6 && brk<0)) return 0;
55 need_v4=1;
56 i++;
57 ip[i&7]=0;
58 break;
59 }
60 s += j+1;
61 }
62 if (brk>=0) {
63 memmove(ip+brk+7-i, ip+brk, 2*(i+1-brk));
64 for (j=0; j<7-i; j++) ip[brk+j] = 0;
65 }
66 for (j=0; j<8; j++) {
67 *a++ = ip[j]>>8;
68 *a++ = ip[j];
69 }
70 if (need_v4 && inet_pton(AF_INET, (void *)s, a-4) <= 0) return 0;
71 return 1;
72}