/*

 * lftp - file transfer program

 *

 * Copyright (c) 1996-2012 by Alexander V. Lukyanov (lav@yars.free.net)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <config.h>

#include <unistd.h>

#include <fcntl.h>

#include <errno.h>

#include "trio.h"

#include "CharReader.h"

int CharReader::Do()

{

   int m=STALL;

   if(ch!=NOCHAR)

      return m;

   if(!Ready(fd,POLLIN))

   {

      Block(fd,POLLIN);

      return m;

   }

   int oldfl=fcntl(fd,F_GETFL);

   if(!(oldfl&O_NONBLOCK))

      fcntl(fd,F_SETFL,oldfl|O_NONBLOCK);

   unsigned char c;

   int res=read(fd,&c,1);

   if(res==-1 && errno==EAGAIN)

      Block(fd,POLLIN);

   else if(res==-1 && errno==EINTR)

      m=MOVED;

   else if(res>0)

   {

      ch=c;

      m=MOVED;

   }

   else	 // eof or error.

   {

      ch=EOFCHAR;

      m=MOVED;

   }

   if(!(oldfl&O_NONBLOCK))

      fcntl(fd,F_SETFL,oldfl);

   if(res==-1 && ch==EOFCHAR)

      fprintf(stderr,"read(%d): %s\n",fd,strerror(errno));

   return m;

}