mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
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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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