90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
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/*
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* Copyright 2017 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/string_to_number.h"
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#include <ctype.h>
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#include <cerrno>
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#include <cstdlib>
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#include "rtc_base/checks.h"
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namespace rtc {
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namespace string_to_number_internal {
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absl::optional<signed_type> ParseSigned(const char* str, int base) {
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RTC_DCHECK(str);
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if (isdigit(str[0]) || str[0] == '-') {
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char* end = nullptr;
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errno = 0;
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const signed_type value = strtoll(str, &end, base);
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if (end && *end == '\0' && errno == 0) {
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return value;
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}
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}
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return absl::nullopt;
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}
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absl::optional<unsigned_type> ParseUnsigned(const char* str, int base) {
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RTC_DCHECK(str);
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if (isdigit(str[0]) || str[0] == '-') {
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// Explicitly discard negative values. std::strtoull parsing causes unsigned
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// wraparound. We cannot just reject values that start with -, though, since
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// -0 is perfectly fine, as is -0000000000000000000000000000000.
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const bool is_negative = str[0] == '-';
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char* end = nullptr;
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errno = 0;
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const unsigned_type value = strtoull(str, &end, base);
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if (end && *end == '\0' && errno == 0 && (value == 0 || !is_negative)) {
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return value;
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}
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}
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return absl::nullopt;
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}
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template <typename T>
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T StrToT(const char* str, char** str_end);
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template <>
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inline float StrToT(const char* str, char** str_end) {
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return strtof(str, str_end);
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}
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template <>
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inline double StrToT(const char* str, char** str_end) {
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return std::strtod(str, str_end);
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}
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template <>
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inline long double StrToT(const char* str, char** str_end) {
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return strtold(str, str_end);
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}
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template <typename T>
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absl::optional<T> ParseFloatingPoint(const char* str) {
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RTC_DCHECK(str);
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if (*str == '\0')
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return absl::nullopt;
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char* end = nullptr;
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errno = 0;
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const T value = StrToT<T>(str, &end);
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if (end && *end == '\0' && errno == 0) {
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return value;
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}
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return absl::nullopt;
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}
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template absl::optional<float> ParseFloatingPoint(const char* str);
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template absl::optional<double> ParseFloatingPoint(const char* str);
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template absl::optional<long double> ParseFloatingPoint(const char* str);
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} // namespace string_to_number_internal
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} // namespace rtc
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