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6e9d89588d
instead of relying on optional.h to included these 2 headers. Bug: webrtc:9078 Change-Id: I7a4b3facd81690b8f107640487e129986c1f5ff6 Reviewed-on: https://webrtc-review.googlesource.com/68602 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22803}
52 lines
1.6 KiB
C++
52 lines
1.6 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 <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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rtc::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 = std::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 rtc::nullopt;
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}
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rtc::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 = std::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 rtc::nullopt;
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}
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} // namespace string_to_number_internal
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} // namespace rtc
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