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/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common/strings.h"
#include <charconv>
#include <cstdlib>
#include <functional>
#include <iomanip>
#include <iterator>
#include <sstream>
#include <system_error>
namespace {
struct IsSpace : std::unary_function<std::string::value_type, bool> {
bool operator()(std::string::value_type v) {
return isspace(static_cast<int>(v));
}
};
struct IsHexDigit : std::unary_function<std::string::value_type, bool> {
bool operator()(std::string::value_type v) {
return isxdigit(static_cast<int>(v));
}
};
} // namespace
namespace bluetooth {
namespace common {
std::string ToHexString(const std::vector<uint8_t>& value) {
return ToHexString(value.begin(), value.end());
}
bool IsValidHexString(const std::string& str) {
return std::find_if_not(str.begin(), str.end(), IsHexDigit{}) == str.end();
}
std::optional<std::vector<uint8_t>> FromHexString(const std::string& str) {
if (str.size() % 2 != 0) {
LOG_INFO("str size is not divisible by 2, size is %zu", str.size());
return std::nullopt;
}
if (std::find_if_not(str.begin(), str.end(), IsHexDigit{}) != str.end()) {
LOG_INFO("value contains none hex digit");
return std::nullopt;
}
std::vector<uint8_t> value;
value.reserve(str.size() / 2);
for (size_t i = 0; i < str.size(); i += 2) {
uint8_t v = 0;
auto ret = std::from_chars(str.c_str() + i, str.c_str() + i + 2, v, 16);
if (std::make_error_code(ret.ec)) {
LOG_INFO("failed to parse hex char at index %zu", i);
return std::nullopt;
}
value.push_back(v);
}
return value;
}
std::string StringTrim(std::string str) {
str.erase(str.begin(), std::find_if_not(str.begin(), str.end(), IsSpace{}));
str.erase(std::find_if_not(str.rbegin(), str.rend(), IsSpace{}).base(), str.end());
return str;
}
std::vector<std::string> StringSplit(const std::string& str, const std::string& delim, size_t max_token) {
ASSERT_LOG(!delim.empty(), "delim cannot be empty");
std::vector<std::string> tokens;
// Use std::string::find and std::string::substr to avoid copying str into a stringstream
std::string::size_type starting_index = 0;
auto index_of_delim = str.find(delim);
while ((max_token == 0 || tokens.size() < (max_token - 1)) && index_of_delim != std::string::npos) {
tokens.push_back(str.substr(starting_index, index_of_delim - starting_index));
starting_index = index_of_delim + delim.size();
index_of_delim = str.find(delim, starting_index);
}
// Append last item to the vector if there are anything left
if (starting_index < (str.size() + 1)) {
tokens.push_back(str.substr(starting_index));
}
return tokens;
}
std::string StringJoin(const std::vector<std::string>& strings, const std::string& delim) {
std::stringstream ss;
for (auto it = strings.begin(); it != strings.end(); it++) {
ss << *it;
if (std::next(it) != strings.end()) {
ss << delim;
}
}
return ss.str();
}
std::optional<int64_t> Int64FromString(const std::string& str) {
char* ptr = nullptr;
errno = 0;
int64_t value = std::strtoll(str.c_str(), &ptr, 10);
if (errno != 0) {
LOG_INFO("cannot parse string '%s' with error '%s'", str.c_str(), strerror(errno));
return std::nullopt;
}
if (ptr == str.c_str()) {
LOG_INFO("string '%s' is empty or has wrong format", str.c_str());
return std::nullopt;
}
if (ptr != (str.c_str() + str.size())) {
LOG_INFO("cannot parse whole string '%s'", str.c_str());
return std::nullopt;
}
return value;
}
std::string ToString(int64_t value) {
return std::to_string(value);
}
std::optional<uint64_t> Uint64FromString(const std::string& str) {
if (str.find('-') != std::string::npos) {
LOG_INFO("string '%s' contains minus sign, this function is for unsigned", str.c_str());
return std::nullopt;
}
char* ptr = nullptr;
errno = 0;
uint64_t value = std::strtoull(str.c_str(), &ptr, 10);
if (errno != 0) {
LOG_INFO("cannot parse string '%s' with error '%s'", str.c_str(), strerror(errno));
return std::nullopt;
}
if (ptr == str.c_str()) {
LOG_INFO("string '%s' is empty or has wrong format", str.c_str());
return std::nullopt;
}
if (ptr != (str.c_str() + str.size())) {
LOG_INFO("cannot parse whole string '%s'", str.c_str());
return std::nullopt;
}
return value;
}
std::string ToString(uint64_t value) {
return std::to_string(value);
}
std::optional<bool> BoolFromString(const std::string& str) {
if (str == "true") {
return true;
} else if (str == "false") {
return false;
} else {
LOG_INFO("string '%s' is neither true nor false", str.c_str());
return std::nullopt;
}
}
std::string ToString(bool value) {
return value ? "true" : "false";
}
} // namespace common
} // namespace bluetooth
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