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#include <arpa/inet.h>
#include <stdlib.h>
in_addr_t inet_addr(const char *cp)
{
unsigned long parts[4] = { 0 };
in_addr_t addr = (in_addr_t)(-1);
size_t part = 0;
while (*cp && part < sizeof(parts)) {
char *next = NULL;
parts[part] = strtoul(cp, &next, 0);
if (*next == '.') {
part++;
cp = next + 1;
} else {
cp = next;
}
/* check for error */
}
switch (part) {
case 0:
addr = htonl(parts[0]);
break;
case 1:
if (parts[0] > 0xff || parts[1] > 0xffffff) {
break;
}
addr = htonl((parts[0] << 24) | parts[1]);
break;
case 2:
if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xffff) {
break;
}
addr = htonl((parts[0] << 24) | (parts[1] << 16) | parts[2]);
break;
case 3:
if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff || parts[3] > 0xff) {
break;
}
addr = htonl((parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3]);
break;
default:
break;
}
return addr;
}
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