+1 Q_strncpyz hack

char *Q_strncpyz( char *dst, const char *src, size_t len ) {
    if ( len == 0 ) {
        abort();
    }

    strncpy( dst, src, len );
    dst[ len -1 ] = '\0';
    return dst;
}


char *Q_strcat( char *dst, size_t dlen, const char *src ) {
    size_t n = strlen( dst  );

    if ( n > dlen ) {
        abort(); /* buffer overflow */
    }

    return Q_strncpyz( dst + n, src, dlen - n );
}


char *Q_strncat( char *dst, size_t dlen, const char *src, size_t slen ) {
    size_t n = strlen( dst );

    if ( n > dlen ) {
        abort(); /* buffer overflow */
    }

    // hack +1, that extra char outside slen will be rewritten by \0 by Q_strncpyz even if there is already a \0
    // and if it's not a \0, we do not want to copy it but since it will be rewritten by \0 it's ok.
    return Q_strncpyz( dst + n, src, MIN( slen + 1, dlen - n ) );
}