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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 | |
15 namespace rtc { | |
16 | |
17 bool 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 | |
45 int 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 | |
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