Serial ID Ban

#include <a_samp>
// Ban Serial ID by O.K.Style™
#define SERIAL_LENGTH 40
/*
add line: native gpci(playerid, serial[], len); to a_players.inc
*/
public OnPlayerConnect(playerid)
{
    if(!fexist("SerialBans.txt")) return 1;
    new serialid[164];
    gpci(playerid, serialid, sizeof(serialid));
    new File:sfile = fopen("SerialBans.txt", io_read);
    if(sfile)
    {
        new banstr[512];
        while(fread(sfile, banstr))
        {
            if(strfind(banstr, serialid) != -1)
            {
                SendClientMessage(playerid, 0x6EF83CFF, "Ваш {FFFFFF}Serial ID {6EF83C}забанен на этом сервере.");
                Kick(playerid);
            }
        }
        fclose(sfile);
    }
    return 1;
}
public OnPlayerCommandText(playerid, cmdtext[])
{
    new cmd[256], idx;
    cmd = strtok(cmdtext, idx);

    if(strcmp(cmd, "/sban", true) == 0)
    {
        new tmp[30];
        tmp = strtok(cmdtext, idx);
        new targetid = strval(tmp);
        new serial[164];
        gpci(targetid, serial, sizeof(serial));
        new File:sfile = fopen("SerialBans.txt", io_readwrite);
        new sstring[162];
        format(sstring, sizeof(sstring), "%s\n", serial);
        fwrite(sfile, sstring);
        fclose(sfile);
        sstring[0] = EOS;
        format(sstring, sizeof(sstring), "Вы забанили серийный номер {FFFFFF}%s", serial);
        SendClientMessage(playerid, 0x6EF83CFF, sstring);
        Kick(targetid);
        return 1;
    }
    if(strcmp(cmd, "/sunban", true) == 0)
    {
        new tmp[30];
        tmp = strtok(cmdtext, idx);
        new serialid[164];
        serialid = tmp;
        if(!fexist("SerialBans.txt")) return SendClientMessage(playerid, 0x6EF83CFF, "На сервере нет забаненных {FFFFFF}Serial ID");
        new File:sfile = fopen("SerialBans.txt", io_readwrite);
        new banstr[512], templine[1024];
        while(fread(sfile, banstr)) strcat(templine, banstr);
        fclose(sfile);
        new index = strfind(templine, serialid);
        if(index == -1) return SendClientMessage(playerid, 0x6EF83CFF, "На этом сервере данный {FFFFFF}Serial ID {6EF83C}не забанен.");
        strdel(templine, index, index + SERIAL_LENGTH);
        sfile = fopen("SerialBans.txt", io_write);
        fwrite(sfile, templine);
        fclose(sfile);
        SendClientMessage(playerid, 0x6EF83CFF, "Вы разабанили серийный номер:");
        new sstring[128];
        format(sstring, sizeof(sstring), "{FFFFFF}%s", serialid);
        SendClientMessage(playerid, -1, sstring);
        return 1;
    }
    if(strcmp(cmdtext, "/serials", true) == 0)
    {
        if(!fexist("SerialBans.txt")) return SendClientMessage(playerid, 0x6EF83CFF, "На сервере нет забаненных {FFFFFF}Serial ID");
        new banstr[512], File:file = fopen("SerialBans.txt", io_read);
        SendClientMessage(playerid, -1, "{6EF83C}Список забаненых серийных номеров:");
        if(file)
        {
            fread(file, banstr);
            fclose(file);
            if(strlen(banstr) < 2) return SendClientMessage(playerid, 0xFFFFFFFF, "Список пуст");
            file = fopen("SerialBans.txt", io_read);
            while(fread(file, banstr)) SendClientMessage(playerid, 0xFFFFFFFF, banstr);
            fclose(file);
        }
        return 1;
    }
    return 0;
}
stock strtok(const string[], &index)
{
    new length = strlen(string);
    while ((index < length) && (string[index] <= ' ')) index++;
    new offset = index, result[20];
    while ((index < length) && (string[index] > ' ') && ((index - offset) < (sizeof(result) - 1)))
    {
        result[index - offset] = string[index];
        index++;
    }
    result[index - offset] = EOS;
    return result;
}