charset code

Hello, Kir,

Do you know, at least something about what the following code from
charset.cpp mean?
Is it some kind of hashing? Why is the assignement repeated twice?

void MakeWordRange(TCHARSET* charset)
{
    mdemset(charset->wordch, 0, sizeof(charset->wordch));
    unsigned char* pc = charset->chars;
    while (*pc)
    {
        charset->wordch[*pc >> 3] |= (1 << (*pc & 7));
        pc++;
    }
    pc = (unsigned char*)WORDCHAR;
    while (*pc)
    {
        charset->wordch[*pc >> 3] |= (1 << (*pc & 7));
        pc++;
    }
}

and

int WordChar(unsigned char s, int charset)
{
    return Charsets[charset].wordch[s >> 3] & (1 << (s & 7)) ? 1 : 0;
}


        Gregory Kozlovsky

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