blob: 2d9bba221fb229951c2493b50afdfd66c0b6a109 [file] [log] [blame]
// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "util/stringprintf.h"
#include <cstdarg>
#include <cstdio>
#include <iomanip>
#include <sstream>
#include "util/osp_logging.h"
namespace openscreen {
std::string StringPrintf(const char* format, ...) {
va_list vlist;
va_start(vlist, format);
const int length = std::vsnprintf(nullptr, 0, format, vlist);
OSP_CHECK_GE(length, 0) << "Invalid format string: " << format;
std::string result(length, '\0');
// Note: There's no need to add one for the extra terminating NUL char since
// the standard, since C++11, requires that "data() + size() points to [the
// NUL terminator]". Thus, std::vsnprintf() will write the NUL to a valid
// memory location.
va_start(vlist, format);
std::vsnprintf(&result[0], length + 1, format, vlist);
return result;
std::string HexEncode(absl::Span<const uint8_t> bytes) {
std::ostringstream hex_dump;
hex_dump << std::setfill('0') << std::hex;
for (const uint8_t byte : bytes) {
hex_dump << std::setw(2) << static_cast<int>(byte);
return hex_dump.str();
} // namespace openscreen