1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "nacl_io/ossocket.h"
6
7#if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
8
9#include <stdio.h>
10#include <string.h>
11#include <limits.h>
12
13int inet_aton(const char *cp, struct in_addr *inp) {
14  unsigned int p1 = 0, p2 = 0, p3 = 0, p4 = 0;
15  int consumed = 0;
16  int matched = sscanf(cp, "%u.%u.%u.%u%n", &p1, &p2, &p3, &p4,
17                       &consumed);
18
19  if (strlen(cp) == consumed && matched == 4) {
20    if ((p1 | p2 | p3 | p4) <= UCHAR_MAX) {
21      in_addr_t host_order_addr = (p1 << 24) | (p2 << 16) | (p3 << 8) | p4;
22      inp->s_addr = htonl(host_order_addr);
23      return 1;
24    }
25  }
26
27  matched = sscanf(cp, "%u.%u.%u%n", &p1, &p2, &p3, &consumed);
28  if (strlen(cp) == consumed && matched == 3) {
29    if ((p1 | p2) <= UCHAR_MAX && p3 <= USHRT_MAX) {
30      in_addr_t host_order_addr = (p1 << 24) | (p2 << 16) | p3;
31      inp->s_addr = htonl(host_order_addr);
32      return 1;
33    }
34  }
35
36  matched = sscanf(cp, "%u.%u%n", &p1, &p2, &consumed);
37  if (strlen(cp) == consumed && matched == 2) {
38    if (p1 <= UCHAR_MAX && p1 <= 1 << 24) {
39      in_addr_t host_order_addr = (p1 << 24) | p2;
40      inp->s_addr = htonl(host_order_addr);
41      return 1;
42    }
43  }
44
45  matched = sscanf(cp, "%u%n", &p1, &consumed);
46  if (strlen(cp) == consumed && matched == 1) {
47    inp->s_addr = htonl(p1);
48    return 1;
49  }
50
51  // Failure
52  return 0;
53}
54
55#endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
56