hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
// Copyright 2020 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "util/stringprintf.h"
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#include <cstdarg>
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#include <cstdio>
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#include <iomanip>
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#include <sstream>
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#include "util/osp_logging.h"
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namespace openscreen {
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std::string StringPrintf(const char* format, ...) {
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va_list vlist;
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va_start(vlist, format);
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const int length = std::vsnprintf(nullptr, 0, format, vlist);
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OSP_CHECK_GE(length, 0) << "Invalid format string: " << format;
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va_end(vlist);
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std::string result(length, '\0');
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// Note: There's no need to add one for the extra terminating NUL char since
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// the standard, since C++11, requires that "data() + size() points to [the
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// NUL terminator]". Thus, std::vsnprintf() will write the NUL to a valid
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// memory location.
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va_start(vlist, format);
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std::vsnprintf(&result[0], length + 1, format, vlist);
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va_end(vlist);
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return result;
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}
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std::string HexEncode(const uint8_t* bytes, std::size_t len) {
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std::ostringstream hex_dump;
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hex_dump << std::setfill('0') << std::hex;
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for (std::size_t i = 0; i < len; i++) {
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hex_dump << std::setw(2) << static_cast<int>(bytes[i]);
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}
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return hex_dump.str();
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}
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} // namespace openscreen
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