ip4_scan.c

/* Public domain, from djbdns-1.05. */

#include "scan.h"
#include "ip4.h"

unsigned int ip4_scan(const char *s,char ip[4])
{
  unsigned int i;
  unsigned int len;
  unsigned long u;

  len = 0;
  i = scan_ulong(s,&u); if (!i) return 0; ip[0] = u; s += i; len += i;
  if (*s != '.') return 0; ++s; ++len;
  i = scan_ulong(s,&u); if (!i) return 0; ip[1] = u; s += i; len += i;
  if (*s != '.') return 0; ++s; ++len;
  i = scan_ulong(s,&u); if (!i) return 0; ip[2] = u; s += i; len += i;
  if (*s != '.') return 0; ++s; ++len;
  i = scan_ulong(s,&u); if (!i) return 0; ip[3] = u; s += i; len += i;
  return len;
}