1/*
2 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/base/versionparsing.h"
12
13#include <stdlib.h>
14
15namespace rtc {
16
17bool ParseVersionString(const std::string& version_str,
18                        int num_expected_segments,
19                        int version[]) {
20  size_t pos = 0;
21  for (int i = 0;;) {
22    size_t dot_pos = version_str.find('.', pos);
23    size_t n;
24    if (dot_pos == std::string::npos) {
25      // npos here is a special value meaning "to the end of the string"
26      n = std::string::npos;
27    } else {
28      n = dot_pos - pos;
29    }
30
31    version[i] = atoi(version_str.substr(pos, n).c_str());
32
33    if (++i >= num_expected_segments) break;
34
35    if (dot_pos == std::string::npos) {
36      // Previous segment was not terminated by a dot, but there's supposed to
37      // be more segments, so that's an error.
38      return false;
39    }
40    pos = dot_pos + 1;
41  }
42  return true;
43}
44
45int CompareVersions(const int version1[],
46                    const int version2[],
47                    int num_segments) {
48  for (int i = 0; i < num_segments; ++i) {
49    int diff = version1[i] - version2[i];
50    if (diff != 0) {
51      return diff;
52    }
53  }
54  return 0;
55}
56
57}  // namespace rtc
58