misc.cpp

#include <cstdarg>
#include <cstdio>
#include <string>

using namespace std;

#include "log.h"
#include "misc.h"

string str_vprintf(const char *format, va_list varg)
{
    const int buf_len = 1024, max_buf_len = buf_len * 1024;
    char buf[buf_len], *p = buf;
    int iteration = 0, printed = false;
    string formatted;
    do {
        int size = buf_len << iteration;
        if (size > max_buf_len) {
            log_error("Can't format string, the result is too long");
            return format;
        }
        if (iteration > 0)
            p = new char[size];
        int res = vsnprintf(p, size, format, varg);
        if (res < 0) {
            log_error("Can't format string, vsnprintf() failed");
            return format;
        }
        if (res < size) {
            printed = true;
            formatted = p;
        }
        if (iteration > 0)
            delete[] p;
        ++iteration;
    } while (not printed);

    return formatted;
}