blob: 6ea779ab8f6b790848a41f1aef7c3a0cf43aef2b [file] [log] [blame]
// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// numeric_lex.h: Functions to extract numeric values from string.
#include <cmath>
#include <sstream>
namespace pp
inline std::ios::fmtflags numeric_base_int(const std::string &str)
if ((str.size() >= 2) && (str[0] == '0') && (str[1] == 'x' || str[1] == 'X'))
return std::ios::hex;
if ((str.size() >= 1) && (str[0] == '0'))
return std::ios::oct;
return std::ios::dec;
// The following functions parse the given string to extract a numerical
// value of the given type. These functions assume that the string is
// of the correct form. They can only fail if the parsed value is too big,
// in which case false is returned.
template <typename IntType>
bool numeric_lex_int(const std::string &str, IntType *value)
std::istringstream stream(str);
// This should not be necessary, but MSVS has a buggy implementation.
// It returns incorrect results if the base is not specified.
stream.setf(numeric_base_int(str), std::ios::basefield);
stream >> (*value);
return !;
template <typename FloatType>
bool numeric_lex_float(const std::string &str, FloatType *value)
// On 64-bit Intel Android, istringstream is broken. Until this is fixed in
// a newer NDK, don't use it. Android doesn't have locale support, so this
// doesn't have to force the C locale.
// TODO(thakis): Remove this once this bug has been fixed in the NDK and
// that NDK has been rolled into chromium.
#if defined(ANGLE_PLATFORM_ANDROID) && __x86_64__
*value = strtod(str.c_str(), nullptr);
return errno != ERANGE;
std::istringstream stream(str);
// Force "C" locale so that decimal character is always '.', and
// not dependent on the current locale.
stream >> (*value);
return ! && std::isfinite(*value);
} // namespace pp.