/*
* 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;
}