1//
2// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
3// Use of this source code is governed by a BSD-style license that can be
4// found in the LICENSE file.
5//
6
7#include "common/angleutils.h"
8
9#include <vector>
10
11std::string FormatString(const char *fmt, va_list vararg)
12{
13    static std::vector<char> buffer(512);
14
15    // Attempt to just print to the current buffer
16    int len = vsnprintf(&buffer[0], buffer.size(), fmt, vararg);
17    if (len < 0 || static_cast<size_t>(len) >= buffer.size())
18    {
19        // Buffer was not large enough, calculate the required size and resize the buffer
20        len = vsnprintf(NULL, 0, fmt, vararg);
21        buffer.resize(len + 1);
22
23        // Print again
24        vsnprintf(&buffer[0], buffer.size(), fmt, vararg);
25    }
26
27    return std::string(buffer.data(), len);
28}
29
30std::string FormatString(const char *fmt, ...)
31{
32    va_list vararg;
33    va_start(vararg, fmt);
34    std::string result = FormatString(fmt, vararg);
35    va_end(vararg);
36    return result;
37}
38