/*-

 * © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan

 * (Royal Institute of Technology, Stockholm, Sweden).

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * 3. Neither the name of the Institute nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#ifndef __SYMBIAN32__

#ifdef HAVE_CONFIG_H

#include <config.h>

RCSID("$Id: readv.c,v 1.1.2.1.2.4 2006/11/23 11:59:59 sivanand Exp $");

#endif

#include "roken.h"

#endif

#include <sys/types.h>

#include <sys/uio.h>

#include <unistd.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/syslimits.h>

#define min(X , Y)   ((X) < (Y) ? (X) :(Y) )

EXPORT_C ssize_t

readv(int d, const struct iovec *iov, int iovcnt)

{

    ssize_t ret, nb;

    size_t tot = 0;

    int VecIter = 0 ;

    char *buf, *p;

    if(iovcnt > IOV_MAX) 

    	{

    	errno = EINVAL ;

    	return -1 ;

    	}

    	if(iovcnt < 0 ) 

    		{

    		errno = EINVAL ;

    		return -1 ;

    		}

    for(VecIter = 0; VecIter  < iovcnt ; ++VecIter)

    	{

    	 if(iov[VecIter].iov_base == NULL) 

    	 { 

    	    if(VecIter != 0) 

    	    {

    	     break ;	 //Break from the for loop 

    	    }

    	 	errno = EFAULT ;

    	 	return -1 ;

    	 }

    	 if((int)iov[VecIter].iov_len >= 0 ) 

    	 {

    	 tot += iov[VecIter].iov_len;

    	 }

    	 else 

    	 {

    	  errno = EINVAL ;

    	  return -1 ;	

    	 }

    	}

    buf = malloc(tot);    	

    if (tot != 0 && buf == NULL) {

        errno = ENOMEM;

        return -1;

    }

    nb = ret = read (d, buf, tot);

    p = buf;

    while (nb > 0) {

        ssize_t cnt = min(nb, iov->iov_len);

        memcpy (iov->iov_base, p, cnt);

        p += cnt;

        nb -= cnt;

        iov += 1 ;      //Newly added

    }

    free(buf);

    return ret;

}