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#include <cstdio>
#include <cstdarg>
#include "util.h"
using namespace std;
string stringf(const char * fmt, ...) {
va_list args, args_copy;
va_start(args, fmt);
va_copy(args_copy, args);
size_t sz = vsnprintf(NULL, 0, fmt, args_copy) + 1;
char * msg = (char *) malloc(sz);
va_end(args_copy);
vsnprintf(msg, sz, fmt, args);
string out = msg;
free(msg);
va_end(args);
return out;
}
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