Comment 6 for bug 690323

the whole program has code like this in countless places:

        char nmeabuf[256];
        nmea_foobar(foo, nmeabuf);

nmea_foobar(foo2* foo, char* bar)
{
           char buf[256];

           sprintf(buf, ....);

           unsigned char cksum = nmea_cksum(buf);

           sprintf(bar, "$%s*%02X\r\n", buf, cksum);
}

so at least we'd have to make buf a few bytes smaller to have a chance,
but I guess that does not even completely fix one of the two issues