native_client_sdk/src/libraries/nacl_io/syscalls/socket/inet_aton.c

   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
  13 int 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__)