sockwrap.c 4.04 KB
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/* sockwrap.c */

/* Berkley/WinSock socket API wrappers */

/* $Id$ */

/****************************************************************************
 * @format.tab-size 4		(Plain Text/Source Code File Header)			*
 * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
 *																			*
 * Copyright 2002 Rob Swindell - http://www.synchro.net/copyright.html		*
 *																			*
 * This library is free software; you can redistribute it and/or			*
 * modify it under the terms of the GNU Lesser General Public License		*
 * as published by the Free Software Foundation; either version 2			*
 * of the License, or (at your option) any later version.					*
 * See the GNU Lesser General Public License for more details: lgpl.txt or	*
 * http://www.fsf.org/copyleft/lesser.html									*
 *																			*
 * Anonymous FTP access to the most recent released source is available at	*
 * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
 *																			*
 * Anonymous CVS access to the development source and modification history	*
 * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
 *     (just hit return, no password is necessary)							*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
 *																			*
 * For Synchronet coding style and modification guidelines, see				*
 * http://www.synchro.net/source.html										*
 *																			*
 * You are encouraged to submit any modifications (preferably in Unix diff	*
 * format) via e-mail to mods@synchro.net									*
 *																			*
 * Note: If this box doesn't appear square, then you need to fix your tabs.	*
 ****************************************************************************/

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#include <stdlib.h>		/* malloc/free on FreeBSD */
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#include <string.h>		/* bzero (for FD_ZERO) on FreeBSD */
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#include <errno.h>		/* ENOMEM */
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#include <stdio.h>		/* SEEK_SET */
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#include <string.h>
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#include "gen_defs.h"	/* BOOL */
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#include "sockwrap.h"	/* sendsocket */
#include "filewrap.h"	/* filelength */

int sendfilesocket(int sock, int file, long *offset, long count)
{
	char*	buf;
	long	len;
	int		rd;
	int		wr;

	len=filelength(file);
	if((buf=malloc(len))==NULL) {
		errno=ENOMEM;
		return(-1);
	}

	if(offset!=NULL)
		if(lseek(file,*offset,SEEK_SET)<0)
			return(-1);

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	if(count<1 || count>len)
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		count=len;

	rd=read(file,buf,count);
	if(rd!=count) {
		free(buf);
		return(-1);
	}

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	wr=sendsocket(sock,buf,count);
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	free(buf);

	if(offset!=NULL)
		(*offset)+=wr;

	return(wr);
}

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int recvfilesocket(int sock, int file, long *offset, long count)
{
	/* Writes a file from a socket -
	 *
	 * sock		- Socket to read from
	 * file		- File descriptior to write to
	 *				MUST be open and writeable
	 * offset	- pointer to file offset to start writing at
	 *				is set to offset writing STOPPED
	 *				on return
	 * count	- number of bytes to read/write
	 *
	 * returns -1 if an error occurse, otherwise
	 * returns number ob bytes written and sets offset
	 * to the new offset
	 */
	 
	char*	buf;
	int		rd;
	int		wr;

	if(count<1) {
		errno=ERANGE;
		return(-1);
	}
		
	if((buf=malloc(count))==NULL) {
		errno=ENOMEM;
		return(-1);
	}

	if(offset!=NULL)
		if(lseek(file,*offset,SEEK_SET)<0)
			return(-1);

	rd=read(sock,buf,count);
	if(rd!=count) {
		free(buf);
		return(-1);
	}

	wr=write(file,buf,rd);
	free(buf);

	if(offset!=NULL)
		(*offset)+=wr;

	return(wr);
}


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/* Return true if connected, optionally sets *rd_p to true if read data available */
BOOL socket_check(SOCKET sock, BOOL* rd_p)
{
	char	ch;
	int		i,rd;
	fd_set	socket_set;
	struct	timeval tv;

	if(rd_p!=NULL)
		*rd_p=FALSE;

	if(sock==INVALID_SOCKET)
		return(FALSE);

	FD_ZERO(&socket_set);
	FD_SET(sock,&socket_set);

	tv.tv_sec=0;
	tv.tv_usec=0;

	i=select(sock+1,&socket_set,NULL,NULL,&tv);
	if(i==SOCKET_ERROR)
		return(FALSE);

	if(i==0) 
		return(TRUE);

	rd=recv(sock,&ch,1,MSG_PEEK);
	if(rd==1 
		|| (rd==SOCKET_ERROR && ERROR_VALUE==EMSGSIZE)) {
		if(rd_p!=NULL)
			*rd_p=TRUE;
		return(TRUE);
	}

	return(FALSE);
}

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