Function filterlang

source/src/protocol.cpp:465–473

// ensures, that d is either two lowercase chars or ""

void filterlang(char *d, const char *s)
{
    if(strlen(s) == 2)
    {
        filtertext(d, s, FTXT_TOLOWER, 2);
        if(islower(d[0]) && islower(d[1])) return;
    }
    *d = '\0';
}

void filtercountrycode(char *d, const char *s) // returns exactly two uppercase chars or "--"
{