nsz Git - musl/blob - src/network/inet_pton.c

   1 #include <sys/socket.h>
   2 #include <netdb.h>
   3 #include <arpa/inet.h>
   4 #include <stdlib.h>
   5 #include <ctype.h>
   6 #include <errno.h>
   7 #include <string.h>
   8
   9 static int hexval(unsigned c)
  10 {
  11         if (c-'0'<10) return c-'0';
  12         c |= 32;
  13         if (c-'a'<6) return c-'a'+10;
  14         return -1;
  15 }
  16
  17 int inet_pton(int af, const char *s, void *a0)
  18 {
  19         uint16_t ip[8];
  20         unsigned char *a = a0;
  21         const char *z;
  22         unsigned long x;
  23         int i, j, v, d, brk=-1, need_v4=0;
  24
  25         /* Reimplement this because inet_pton cannot accept special v4 forms */
  26         if (af==AF_INET) {
  27                 for (i=0; i<4 && *s; i++) {
  28                         a[i] = x = strtoul(s, (char **)&z, 10);
  29                         if (!isdigit(*s) || z==s || (*z && *z != '.') || x>255)
  30                                 return 0;
  31                         s=z+1;
  32                 }
  33                 return 1;
  34         } else if (af!=AF_INET6) {
  35                 errno = EAFNOSUPPORT;
  36                 return -1;
  37         }
  38
  39         if (s[0]==':' && s[1]==':') s++;
  40
  41         for (i=0; ; i++, s+=j+1) {
  42                 if (s[0]==':' && brk<0) {
  43                         brk=i;
  44                         j=0;
  45                         ip[i]=0;
  46                         if (!s[1]) break;
  47                         continue;
  48                 }
  49                 if (hexval(s[0])<0) return -1;
  50                 while (s[0]=='0' && s[1]=='0') s++;
  51                 for (v=j=0; j<5 && (d=hexval(s[j]))>=0; j++)
  52                         v=16*v+d;
  53                 if (v > 65535) return -1;
  54                 ip[i] = v;
  55                 if (!s[j]) {
  56                         if (brk<0 && i!=7) return -1;
  57                         break;
  58                 }
  59                 if (i<7) {
  60                         if (s[j]==':') continue;
  61                         if (s[j]!='.') return -1;
  62                         need_v4=1;
  63                         i++;
  64                         break;
  65                 }
  66                 return -1;
  67         }
  68         if (brk>=0) {
  69                 memmove(ip+brk+7-i, ip+brk, 2*(i+1-brk));
  70                 for (j=0; j<7-i; j++) ip[brk+j] = 0;
  71         }
  72         for (j=0; j<8; j++) {
  73                 *a++ = ip[j]>>8;
  74                 *a++ = ip[j];
  75         }
  76         if (need_v4 &&inet_pton(AF_INET, (void *)s, a-4) <= 0) return -1;
  77         return 1;
  78 }