28 lines
708 B
C++
28 lines
708 B
C++
#pragma once
|
|
#include <cstdarg>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
namespace trnr {
|
|
|
|
// Formats a string (like printf) using a format string and variable arguments.
|
|
inline std::string format(const char* fmt, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
std::vector<char> buf(256);
|
|
int needed = vsnprintf(buf.data(), buf.size(), fmt, args);
|
|
va_end(args);
|
|
|
|
if (needed < 0) { return {}; }
|
|
if (static_cast<size_t>(needed) < buf.size()) { return std::string(buf.data(), needed); }
|
|
|
|
// Resize and try again if the buffer was too small
|
|
buf.resize(needed + 1);
|
|
va_start(args, fmt);
|
|
vsnprintf(buf.data(), buf.size(), fmt, args);
|
|
va_end(args);
|
|
|
|
return std::string(buf.data(), needed);
|
|
}
|
|
} // namespace trnr
|