1#include <ctype.h> 2#include <sys/socket.h> 3#include <netinet/in.h> 4#include <arpa/inet.h> 5#include <stdlib.h> 6 7int __inet_aton(const char *s0, struct in_addr *dest) 8{ 9 const char *s = s0; 10 unsigned char *d = (void *)dest; 11 unsigned long a[4] = { 0 }; 12 char *z; 13 int i; 14 15 for (i=0; i<4; i++) { 16 a[i] = strtoul(s, &z, 0); 17 if (z==s || (*z && *z != '.') || !isdigit(*s)) 18 return 0; 19 if (!*z) break; 20 s=z+1; 21 } 22 if (i==4) return 0; 23 switch (i) { 24 case 0: 25 a[1] = a[0] & 0xffffff; 26 a[0] >>= 24; 27 case 1: 28 a[2] = a[1] & 0xffff; 29 a[1] >>= 16; 30 case 2: 31 a[3] = a[2] & 0xff; 32 a[2] >>= 8; 33 } 34 for (i=0; i<4; i++) { 35 if (a[i] > 255) return 0; 36 d[i] = a[i]; 37 } 38 return 1; 39} 40 41weak_alias(__inet_aton, inet_aton); 42