int String::vprintf(const char * format, va_list ap0)
{
reserve(size() + 64);
int res;
va_list ap;
loop: {
int avail = storage_end_ - end_;
if (avail > 1024) return -1;
va_copy(ap,ap0);
res = vsnprintf(end_, avail, format, ap);
va_end(ap);
if (res < 0) {
reserve_i(); goto loop;
} else if (res > avail) {
reserve_i(size() + res); goto loop;
}
}
end_ += res;
return res;
}
int String::vprintf(const char * format, va_list ap0)
{
reserve(size() + 64);
int res = 0;
va_list ap;
loop: {
int avail = storage_end_ - end_;
if (res < 0 && avail > 1024*1024)
return -1; // to avoid an infinite loop in case a neg result
// really means an error and not just "not enough
// space"
va_copy(ap,ap0);
res = vsnprintf(end_, avail, format, ap);
va_end(ap);
if (res < 0) {
reserve_i(); goto loop;
} else if (res > avail) {
reserve_i(size() + res); goto loop;
}
}
end_ += res;
return res;
}
