| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // https://developers.google.com/protocol-buffers/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include <google/protobuf/io/strtod.h> |
| |
| #include <cstdio> |
| #include <cstring> |
| #include <limits> |
| #include <string> |
| |
| #include <google/protobuf/stubs/logging.h> |
| #include <google/protobuf/stubs/common.h> |
| |
| #include <google/protobuf/stubs/strutil.h> |
| |
| namespace google { |
| namespace protobuf { |
| namespace io { |
| |
| // This approximately 0x1.ffffffp127, but we don't use 0x1.ffffffp127 because |
| // it won't compile in MSVC. |
| const double MAX_FLOAT_AS_DOUBLE_ROUNDED = 3.4028235677973366e+38; |
| |
| float SafeDoubleToFloat(double value) { |
| // static_cast<float> on a number larger than float can result in illegal |
| // instruction error, so we need to manually convert it to infinity or max. |
| if (value > std::numeric_limits<float>::max()) { |
| // Max float value is about 3.4028234664E38 when represented as a double. |
| // However, when printing float as text, it will be rounded as |
| // 3.4028235e+38. If we parse the value of 3.4028235e+38 from text and |
| // compare it to 3.4028234664E38, we may think that it is larger, but |
| // actually, any number between these two numbers could only be represented |
| // as the same max float number in float, so we should treat them the same |
| // as max float. |
| if (value <= MAX_FLOAT_AS_DOUBLE_ROUNDED) { |
| return std::numeric_limits<float>::max(); |
| } |
| return std::numeric_limits<float>::infinity(); |
| } else if (value < -std::numeric_limits<float>::max()) { |
| if (value >= -MAX_FLOAT_AS_DOUBLE_ROUNDED) { |
| return -std::numeric_limits<float>::max(); |
| } |
| return -std::numeric_limits<float>::infinity(); |
| } else { |
| return static_cast<float>(value); |
| } |
| } |
| |
| double NoLocaleStrtod(const char* str, char** endptr) { |
| return google::protobuf::internal::NoLocaleStrtod(str, endptr); |
| } |
| |
| } // namespace io |
| } // namespace protobuf |
| } // namespace google |