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 58
