path: root/src/char/inter.c

// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder

#include <string.h>
#include <stdlib.h>

#include "../common/db.h"
#include "../common/mmo.h"
#include "../common/socket.h"
#include "../common/timer.h"
#include "../common/malloc.h"
#include "../common/lock.h"
#include "../common/showmsg.h"

#include "char.h"
#include "inter.h"
#include "int_party.h"
#include "int_guild.h"
#include "int_status.h"
#include "int_storage.h"
#include "int_pet.h"
#include "int_homun.h"

#define WISDATA_TTL (60*1000)	// Existence time of Wisp/page data (60 seconds)
                             	// that is the waiting time of answers of all map-servers
#define WISDELLIST_MAX 256   	// Number of elements of Wisp/page data deletion list

char inter_log_filename[1024] = "log/inter.log";
char main_chat_nick[16] = "Main";

char accreg_txt[1024] = "save/accreg.txt";
static struct dbt *accreg_db = NULL;

struct accreg {
	int account_id, char_id;
	int reg_num;
	struct global_reg reg[ACCOUNT_REG_NUM];
};

unsigned int party_share_level = 10;

// sending packet list
// NOTE: This variable ain't used at all! And it's confusing.. where do I add that the length of packet 0x2b07 is 10? x.x [Skotlex]
int inter_send_packet_length[]={
	-1,-1,27,-1, -1, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0, //0x3000-0x300f
	-1, 7, 0, 0,  0, 0, 0, 0, -1,11, 0, 0,  0, 0,  0, 0,
	35,-1,11,15, 34,29, 7,-1,  0, 0, 0, 0,  0, 0,  0, 0,
	10,-1,15, 0, 79,19, 7,-1,  0,-1,-1,-1, 14,67,186,-1,
	 9, 9,-1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	11,-1, 7, 3, 36, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
};
// recv. packet list
int inter_recv_packet_length[]={
	-1,-1, 7,-1, -1,13, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0, //0x3000-0x300f
	 6,-1, 0, 0,  0, 0, 0, 0, 10,-1, 0, 0,  0, 0,  0, 0, //0x3010-0x301f
	-1, 6,-1,14, 14,19, 6,-1, 14,14, 0, 0,  0, 0,  0, 0, //0x3020-0x302f
	-1, 6,-1,-1, 55,19, 6,-1, 14,-1,-1,-1, 14,19,186,-1, //0x3030-0x303f
	 5, 9, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0,
	48,14,-1, 6, 35, 0, 0, 0,  0, 0, 0, 0,  0, 0,  0, 0, //0x3080-0x308f
	68,10,-1, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x3090 - 0x309f  Homunculus packets [albator]
};

struct WisData {
	int id, fd, count, len;
	unsigned long tick;
	unsigned char src[24], dst[24], msg[1024];
};
static struct dbt * wis_db = NULL;
static int wis_dellist[WISDELLIST_MAX], wis_delnum;


//--------------------------------------------------------

// �A�J�E���g�ϐ��𕶎���֕ϊ�
int inter_accreg_tostr(char *str, struct accreg *reg) {
	int j;
	char *p = str;

	p += sprintf(p, "%d\t", reg->account_id);
	for(j = 0; j < reg->reg_num; j++) {
		p += sprintf(p,"%s,%s ", reg->reg[j].str, reg->reg[j].value);
	}

	return 0;
}

// �A�J�E���g�ϐ��𕶎��񂩂�ϊ�
int inter_accreg_fromstr(const char *str, struct accreg *reg) {
	int j, n;
	const char *p = str;

	if (sscanf(p, "%d\t%n", &reg->account_id, &n ) != 1 || reg->account_id <= 0)
		return 1;

	for(j = 0, p += n; j < ACCOUNT_REG_NUM; j++, p += n) {
		if (sscanf(p, "%[^,],%[^ ] %n", reg->reg[j].str, reg->reg[j].value, &n) != 2) 
			break;
	}
	reg->reg_num = j;

	return 0;
}

// �A�J�E���g�ϐ��̓ǂݍ���
int inter_accreg_init(void) {
	char line[8192];
	FILE *fp;
	int c = 0;
	struct accreg *reg;

	accreg_db = db_alloc(__FILE__,__LINE__,DB_INT,DB_OPT_RELEASE_DATA,sizeof(int));

	if( (fp = fopen(accreg_txt, "r")) == NULL)
		return 1;
	while(fgets(line, sizeof(line)-1, fp)){
		line[sizeof(line)-1] = '\0';

		reg = (struct accreg*)aCalloc(sizeof(struct accreg), 1);
		if (reg == NULL) {
			ShowFatalError("inter: accreg: out of memory!\n");
			exit(0);
		}
		if (inter_accreg_fromstr(line, reg) == 0 && reg->account_id > 0) {
			idb_put(accreg_db, reg->account_id, reg);
		} else {
			ShowError("inter: accreg: broken data [%s] line %d\n", accreg_txt, c);
			aFree(reg);
		}
		c++;
	}
	fclose(fp);
//	printf("inter: %s read done (%d)\n", accreg_txt, c);

	return 0;
}

// �A�J�E���g�ϐ��̃Z�[�u�p
int inter_accreg_save_sub(DBKey key, void *data, va_list ap) {
	char line[8192];
	FILE *fp;
	struct accreg *reg = (struct accreg *)data;

	if (reg->reg_num > 0) {
		inter_accreg_tostr(line,reg);
		fp = va_arg(ap, FILE *);
		fprintf(fp, "%s" RETCODE, line);
	}

	return 0;
}

// �A�J�E���g�ϐ��̃Z�[�u
int inter_accreg_save(void) {
	FILE *fp;
	int lock;

	if ((fp = lock_fopen(accreg_txt,&lock)) == NULL) {
		ShowError("int_accreg: cant write [%s] !!! data is lost !!!\n", accreg_txt);
		return 1;
	}
	accreg_db->foreach(accreg_db, inter_accreg_save_sub,fp);
	lock_fclose(fp, accreg_txt, &lock);
//	printf("inter: %s saved.\n", accreg_txt);

	return 0;
}

//--------------------------------------------------------

/*==========================================
 * �ݒ�t�@�C����ǂݍ���
 *------------------------------------------
 */
int inter_config_read(const char *cfgName) {
	char line[1024], w1[1024], w2[1024];
	FILE *fp;

	fp = fopen(cfgName, "r");
	if (fp == NULL) {
		ShowError("file not found: %s\n", cfgName);
		return 1;
	}
	while(fgets(line, sizeof(line) - 1, fp)) {
		if (line[0] == '/' && line[1] == '/')
			continue;
		line[sizeof(line)-1] = '\0';

		if (sscanf(line,"%[^:]: %[^\r\n]", w1, w2) != 2)
			continue;

		if (strcmpi(w1, "storage_txt") == 0) {
			strncpy(storage_txt, w2, sizeof(storage_txt));
		} else if (strcmpi(w1, "party_txt") == 0) {
			strncpy(party_txt, w2, sizeof(party_txt));
		} else if (strcmpi(w1, "guild_txt") == 0) {
			strncpy(guild_txt, w2, sizeof(guild_txt));
		} else if (strcmpi(w1, "pet_txt") == 0) {
			strncpy(pet_txt, w2, sizeof(pet_txt));
		} else if (strcmpi(w1, "homun_txt") == 0) {
			strncpy(homun_txt, w2, sizeof(homun_txt));
		} else if (strcmpi(w1, "castle_txt") == 0) {
			strncpy(castle_txt, w2, sizeof(castle_txt));
		} else if (strcmpi(w1, "accreg_txt") == 0) {
			strncpy(accreg_txt, w2, sizeof(accreg_txt));
		} else if (strcmpi(w1, "guild_storage_txt") == 0) {
			strncpy(guild_storage_txt, w2, sizeof(guild_storage_txt));
		} else if (strcmpi(w1, "party_share_level") == 0) {
			party_share_level = (unsigned int)atof(w2);
		} else if (strcmpi(w1, "inter_log_filename") == 0) {
			strncpy(inter_log_filename, w2, sizeof(inter_log_filename));
		} else if(strcmpi(w1,"log_inter")==0) {
			log_inter = atoi(w2);
		} else if(strcmpi(w1, "main_chat_nick")==0){	// Main chat nick [LuzZza]
			strcpy(main_chat_nick, w2);					// 
		} else if (strcmpi(w1, "import") == 0) {
			inter_config_read(w2);
		}
	}
	fclose(fp);

	return 0;
}

// ���O�����o��
int inter_log(char *fmt,...) {
	FILE *logfp;
	va_list ap;

	va_start(ap,fmt);
	logfp = fopen(inter_log_filename, "a");
	if (logfp) {
		vfprintf(logfp, fmt, ap);
		fclose(logfp);
	}
	va_end(ap);

	return 0;
}

// �Z�[�u
int inter_save(void) {
#ifdef ENABLE_SC_SAVING
	inter_status_save();
#endif
	inter_party_save();
	inter_guild_save();
	inter_storage_save();
	inter_guild_storage_save();
	inter_pet_save();
	inter_homun_save();
	inter_accreg_save();

	return 0;
}

// ������
int inter_init(const char *file) {
	inter_config_read(file);

	wis_db = db_alloc(__FILE__,__LINE__,DB_INT,DB_OPT_RELEASE_DATA,sizeof(int));

	inter_party_init();
	inter_guild_init();
	inter_storage_init();
	inter_pet_init();
	inter_homun_init();
	inter_accreg_init();

	return 0;
}

// finalize
void inter_final(void) {
	accreg_db->destroy(accreg_db, NULL);
	wis_db->destroy(wis_db, NULL);

	inter_party_final();
	inter_guild_final();
	inter_storage_final();
	inter_pet_final();
	inter_homun_final();

	return;
}

// �}�b�v�T�[�o�[�ڑ�
int inter_mapif_init(int fd) {
	inter_guild_mapif_init(fd);

	return 0;
}

//--------------------------------------------------------
// sended packets to map-server

//Sends to map server the current max Account/Char id [Skotlex]
void mapif_send_maxid(int account_id, int char_id)
{
	unsigned char buf[12];

	WBUFW(buf,0) = 0x2b07;
	WBUFL(buf,2) = account_id;
	WBUFL(buf,6) = char_id;
	mapif_sendall(buf, 10);
}

// GM���b�Z�[�W���M
int mapif_GMmessage(unsigned char *mes, int len, unsigned long color, int sfd) {
	unsigned char buf[2048];

	if (len > 2048) len = 2047; //Make it fit to avoid crashes. [Skotlex]
	WBUFW(buf,0) = 0x3800;
	WBUFW(buf,2) = len;
	WBUFL(buf,4) = color;
	memcpy(WBUFP(buf,8), mes, len - 8);
	mapif_sendallwos(sfd, buf, len);
//	printf("inter server: GM:%d %s\n", len, mes);

	return 0;
}

// Wisp/page transmission to all map-server
int mapif_wis_message(struct WisData *wd) {
	unsigned char buf[2048];
	if (wd->len > 2047-56) wd->len = 2047-56; //Force it to fit to avoid crashes. [Skotlex]

	WBUFW(buf, 0) = 0x3801;
	WBUFW(buf, 2) = 56 + wd->len;
	WBUFL(buf, 4) = wd->id;
	memcpy(WBUFP(buf, 8), wd->src, NAME_LENGTH);
	memcpy(WBUFP(buf,32), wd->dst, NAME_LENGTH);
	memcpy(WBUFP(buf,56), wd->msg, wd->len);
	wd->count = mapif_sendall(buf, WBUFW(buf,2));

	return 0;
}

// Wisp/page transmission result to map-server
int mapif_wis_end(struct WisData *wd, int flag) {
	unsigned char buf[27];

	WBUFW(buf, 0) = 0x3802;
	memcpy(WBUFP(buf, 2), wd->src, 24);
	WBUFB(buf,26) = flag; // flag: 0: success to send wisper, 1: target character is not loged in?, 2: ignored by target
	mapif_send(wd->fd, buf, 27);
//	printf("inter server wis_end: flag: %d\n", flag);

	return 0;
}

// �A�J�E���g�ϐ����M
int mapif_account_reg(int fd, unsigned char *src) {
	unsigned char *buf = aCalloc(1,WBUFW(src,2));

	memcpy(WBUFP(buf,0),src,WBUFW(src,2));
	WBUFW(buf, 0) = 0x3804;
	mapif_sendallwos(fd, buf, WBUFW(buf,2));

	aFree(buf);

	return 0;
}

// �A�J�E���g�ϐ��v���ԐM
int mapif_account_reg_reply(int fd,int account_id, int char_id) {
	struct accreg *reg = idb_get(accreg_db,account_id);

	WFIFOHEAD(fd, ACCOUNT_REG_NUM * 288+ 13);
	WFIFOW(fd,0) = 0x3804;
	WFIFOL(fd,4) = account_id;
	WFIFOL(fd,8) = char_id;
	WFIFOB(fd,12) = 2; //Acc Reg
	if (reg == NULL) {
		WFIFOW(fd,2) = 13;
	} else {
		int i, p;
		for (p=13,i = 0; i < reg->reg_num; i++) {
			p+= sprintf(WFIFOP(fd,p), "%s", reg->reg[i].str)+1; //We add 1 to consider the '\0' in place.
			p+= sprintf(WFIFOP(fd,p), "%s", reg->reg[i].value)+1;
		}
		WFIFOW(fd,2)=p;
	}
	WFIFOSET(fd,WFIFOW(fd,2));
	return 0;
}

//Request to kick char from a certain map server. [Skotlex]
int mapif_disconnectplayer(int fd, int account_id, int char_id, int reason)
{
	if (fd < 0)
		return -1;
	
	WFIFOHEAD(fd, 7);
	WFIFOW(fd,0) = 0x2b1f;
	WFIFOL(fd,2) = account_id;
	WFIFOB(fd,6) = reason;
	WFIFOSET(fd,7);
	
	return 0;
}

//--------------------------------------------------------

// Existence check of WISP data
int check_ttl_wisdata_sub(DBKey key, void *data, va_list ap) {
	unsigned long tick;
	struct WisData *wd = (struct WisData *)data;
	tick = va_arg(ap, unsigned long);

	if (DIFF_TICK(tick, wd->tick) > WISDATA_TTL && wis_delnum < WISDELLIST_MAX)
		wis_dellist[wis_delnum++] = wd->id;

	return 0;
}

int check_ttl_wisdata(void) {
	unsigned long tick = gettick();
	int i;

	do {
		wis_delnum = 0;
		wis_db->foreach(wis_db, check_ttl_wisdata_sub, tick);
		for(i = 0; i < wis_delnum; i++) {
			struct WisData *wd = idb_get(wis_db, wis_dellist[i]);
			ShowWarning("inter: wis data id=%d time out : from %s to %s\n", wd->id, wd->src, wd->dst);
			// removed. not send information after a timeout. Just no answer for the player
			//mapif_wis_end(wd, 1); // flag: 0: success to send wisper, 1: target character is not loged in?, 2: ignored by target
			idb_remove(wis_db, wd->id);
		}
	} while(wis_delnum >= WISDELLIST_MAX);

	return 0;
}

//--------------------------------------------------------
// received packets from map-server

// GM���b�Z�[�W���M
int mapif_parse_GMmessage(int fd) {
	RFIFOHEAD(fd);
	mapif_GMmessage(RFIFOP(fd,8), RFIFOW(fd,2), RFIFOL(fd,4), fd);

	return 0;
}

// Wisp/page request to send
int mapif_parse_WisRequest(int fd) {
	struct WisData* wd;
	char name[NAME_LENGTH];
	static int wisid = 0;
	int index;
	RFIFOHEAD(fd);

	if (RFIFOW(fd,2)-52 >= sizeof(wd->msg)) {
		ShowWarning("inter: Wis message size too long.\n");
		return 0;
	} else if (RFIFOW(fd,2)-52 <= 0) { // normaly, impossible, but who knows...
		ShowError("inter: Wis message doesn't exist.\n");
		return 0;
	}

	memcpy(name, RFIFOP(fd,28), NAME_LENGTH); //Received name may be too large and not contain \0! [Skotlex]
	name[NAME_LENGTH-1]= '\0';
	// search if character exists before to ask all map-servers
	if ((index = search_character_index(name)) == -1) {
		unsigned char buf[27];
		WBUFW(buf, 0) = 0x3802;
		memcpy(WBUFP(buf, 2), RFIFOP(fd, 4), NAME_LENGTH);
		WBUFB(buf,26) = 1; // flag: 0: success to send wisper, 1: target character is not loged in?, 2: ignored by target
		mapif_send(fd, buf, 27);
	// Character exists. So, ask all map-servers
	} else {
		// to be sure of the correct name, rewrite it
		memset(name, 0, NAME_LENGTH);
		strncpy(name, search_character_name(index), NAME_LENGTH);
		// if source is destination, don't ask other servers.
		if (strcmp((char*)RFIFOP(fd,4),name) == 0) {
			unsigned char buf[27];
			WBUFW(buf, 0) = 0x3802;
			memcpy(WBUFP(buf, 2), RFIFOP(fd, 4), NAME_LENGTH);
			WBUFB(buf,26) = 1; // flag: 0: success to send wisper, 1: target character is not loged in?, 2: ignored by target
			mapif_send(fd, buf, 27);
		} else {

			wd = (struct WisData *)aCalloc(sizeof(struct WisData), 1);
			if (wd == NULL){
				ShowFatalError("inter: WisRequest: out of memory !\n");
				return 0;
			}

			// Whether the failure of previous wisp/page transmission (timeout)
			check_ttl_wisdata();

			wd->id = ++wisid;
			wd->fd = fd;
			wd->len= RFIFOW(fd,2)-52;
			memcpy(wd->src, RFIFOP(fd, 4), NAME_LENGTH);
			memcpy(wd->dst, RFIFOP(fd,28), NAME_LENGTH);
			memcpy(wd->msg, RFIFOP(fd,52), wd->len);
			wd->tick = gettick();
			idb_put(wis_db, wd->id, wd);
			mapif_wis_message(wd);
		}
	}

	return 0;
}

// Wisp/page transmission result
int mapif_parse_WisReply(int fd) {
	int id, flag;
	struct WisData *wd;
	RFIFOHEAD(fd);
	id = RFIFOL(fd,2);
	flag = RFIFOB(fd,6);
	wd = idb_get(wis_db, id);

	if (wd == NULL)
		return 0;	// This wisp was probably suppress before, because it was timeout of because of target was found on another map-server

	if ((--wd->count) <= 0 || flag != 1) {
		mapif_wis_end(wd, flag); // flag: 0: success to send wisper, 1: target character is not loged in?, 2: ignored by target
		idb_remove(wis_db, id);
	}

	return 0;
}

// Received wisp message from map-server for ALL gm (just copy the message and resends it to ALL map-servers)
int mapif_parse_WisToGM(int fd) {
	unsigned char buf[2048]; // 0x3003/0x3803 <packet_len>.w <wispname>.24B <min_gm_level>.w <message>.?B
	RFIFOHEAD(fd);
	memcpy(WBUFP(buf,0), RFIFOP(fd,0), RFIFOW(fd,2));
	WBUFW(buf, 0) = 0x3803;
	mapif_sendall(buf, RFIFOW(fd,2));

	return 0;
}

static void* create_accreg(DBKey key, va_list args) {
	struct accreg *reg;
	reg = (struct accreg*)aCalloc(sizeof(struct accreg), 1);
	reg->account_id = key.i;
	return reg;
}

// �A�J�E���g�ϐ��ۑ��v��
int mapif_parse_Registry(int fd) {
	int j, p, len;
	struct accreg *reg;
	RFIFOHEAD(fd);

	switch (RFIFOB(fd,12)) {
		case 3: //Character registry
			return char_parse_Registry(RFIFOL(fd,4), RFIFOL(fd,8), RFIFOP(fd,13), RFIFOW(fd,2)-13);
		case 2: //Acc Reg
			break;
		case 1: //Acc Reg2, forward to login
			return save_accreg2(RFIFOP(fd,4), RFIFOW(fd,2)-4);
		default: //Error?
			return 1; 
	}
	reg = idb_ensure(accreg_db, RFIFOL(fd,4), create_accreg);

	for(j=0,p=13;j<ACCOUNT_REG_NUM && p<RFIFOW(fd,2);j++){
		sscanf(RFIFOP(fd,p), "%31c%n",reg->reg[j].str,&len);
		reg->reg[j].str[len]='\0';
		p +=len+1; //+1 to skip the '\0' between strings.
		sscanf(RFIFOP(fd,p), "%255c%n",reg->reg[j].value,&len);
		reg->reg[j].value[len]='\0';
		p +=len+1;
	}
	reg->reg_num=j;
	mapif_account_reg(fd, RFIFOP(fd,0));	// ����MAP�T�[�o�[�ɑ��M

	return 0;
}

// Request the value of all registries.
int mapif_parse_RegistryRequest(int fd)
{
	//Load Char Registry
	if (RFIFOB(fd,12))
		char_account_reg_reply(fd,RFIFOL(fd,2),RFIFOL(fd,6));
	//Load Account Registry
	if (RFIFOB(fd,11))
		mapif_account_reg_reply(fd,RFIFOL(fd,2),RFIFOL(fd,6));
	//Ask Login Server for Account2 values.
	if (RFIFOB(fd,10))
		request_accreg2(RFIFOL(fd,2),RFIFOL(fd,6)-2);
	return 1;
}

//--------------------------------------------------------

// map server ����̒ʐM�i�P�p�P�b�g�̂݉�͂��邱�Ɓj
// �G���[�Ȃ�0(false)�A�����ł����Ȃ�1�A
// �p�P�b�g��������Ȃ����2���������Ȃ���΂Ȃ�Ȃ�
int inter_parse_frommap(int fd) {
	int cmd, len;
	RFIFOHEAD(fd);
	cmd = RFIFOW(fd,0);
	len = 0;

	// inter�I�NJ����𒲂ׂ�
	if (cmd < 0x3000 || cmd >= 0x3000 + (sizeof(inter_recv_packet_length) / sizeof(inter_recv_packet_length[0])))
		return 0;
	
	if (inter_recv_packet_length[cmd-0x3000] == 0) //This is necessary, because otherwise we return 2 and the char server will just hang waiting for packets! [Skotlex]
		return 0;

	// �p�P�b�g���𒲂ׂ�
	if ((len = inter_check_length(fd, inter_recv_packet_length[cmd - 0x3000])) == 0)
		return 2;

	switch(cmd) {
	case 0x3000: mapif_parse_GMmessage(fd); break;
	case 0x3001: mapif_parse_WisRequest(fd); break;
	case 0x3002: mapif_parse_WisReply(fd); break;
	case 0x3003: mapif_parse_WisToGM(fd); break;
	case 0x3004: mapif_parse_Registry(fd); break;
	case 0x3005: mapif_parse_RegistryRequest(fd); break;
	default:
		if (inter_party_parse_frommap(fd))
			break;
		if (inter_guild_parse_frommap(fd))
			break;
		if (inter_storage_parse_frommap(fd))
			break;
		if (inter_pet_parse_frommap(fd))
			break;
		if (inter_homun_parse_frommap(fd))
			break;
		return 0;
	}
	RFIFOSKIP(fd, len);
	return 1;
}

// RFIFO�̃p�P�b�g���m�F
// �K�v�p�P�b�g��������΃p�P�b�g���A�܂�����Ȃ����0
int inter_check_length(int fd, int length) {
	if (length == -1) {	// �•σp�P�b�g��
		RFIFOHEAD(fd);
		if (RFIFOREST(fd) < 4)	// �p�P�b�g��������
			return 0;
		length = RFIFOW(fd,2);
	}

	if ((int)RFIFOREST(fd) < length)	// �p�P�b�g������
		return 0;

	return length;
}