1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// 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;
va_end(vlist);
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);
va_end(vlist);
return result;
}
std::string HexEncode(const uint8_t* bytes, std::size_t len) {
std::ostringstream hex_dump;
hex_dump << std::setfill('0') << std::hex;
for (std::size_t i = 0; i < len; i++) {
hex_dump << std::setw(2) << static_cast<int>(bytes[i]);
}
return hex_dump.str();
}
} // namespace openscreen
|
