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#include <cstdarg>
#include <cstdio>
#include <string>
#include "fmt.h"
using namespace std;
string crepe::va_stringf(va_list args, const char * fmt) {
string out;
va_list args_copy;
va_copy(args_copy, args);
size_t length = vsnprintf(NULL, 0, fmt, args_copy);
// resize to include terminating null byte
out.resize(length + 1);
va_end(args_copy);
// vsnprintf adds terminating null byte
vsnprintf(out.data(), out.size(), fmt, args);
// resize to actual length
out.resize(length);
va_end(args);
return out;
}
string crepe::stringf(const char * fmt, ...) {
va_list args;
va_start(args, fmt);
string out = va_stringf(args, fmt);
va_end(args);
return out;
}
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