/*-

  * © 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;

 }