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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// 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