stream_cat.c

/*
  $NiH: stream_cat.c,v 1.7 2002/04/16 22:46:12 wiz Exp $

  stream_cat.c -- concatenate multiple article streams
  Copyright (C) 2002 Dieter Baron and Thomas Klausner

  This file is part of cg, a program to assemble and decode binary Usenet
  postings.  The authors can be contacted at <nih@giga.or.at>

  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 2 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, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>

#include "checkgroup.h"
#include "stream.h"
#include "stream_types.h"
#include "util.h"

struct stream_cat {
    stream st;

    int i;
    struct file *file;
    FILE *cur;
};

static void close_current(struct stream_cat *this);
static int cat_close(struct stream_cat *st);
static token *cat_get(struct stream_cat *st);

extern char *nntp_response;



stream *
stream_cat_open(struct file *file)
{
    struct stream_cat *this;

    this = (struct stream_cat *)stream_new(sizeof(struct stream_cat),
					   cat_get, cat_close, NULL);

    this->i = 0;
    this->file = file;
    this->cur = NULL;

    return (stream *)this;
}



static int
cat_close(struct stream_cat *this)
{
    close_current(this);
    stream_free((stream *)this);

    return 0;
}



static token *
cat_get(struct stream_cat *this)
{
    token *t;
    int ret;

    if (this->st.source == NULL) {
	if (this->i > this->file->npart) {
	    close_current(this);
	    return TOKEN_EOF;
	}

	/* skip part 0 if it doesn't exist */
	if (this->i == 0 && this->file->artno[0] == -1)
	    this->i++;

	ret = nntp_put("article %ld", this->file->artno[this->i++]);
	if (ret != 220 && ret != 224) {
	    token_printf3(stream_enqueue((stream *)this),
			  TOK_ERR, TOK_ERR_ERROR, "article %ld failed: %s",
			  this->file->artno[this->i-1], nntp_response);
	    return token_set(&this->st.tok, TOK_EOA, NULL);
	}

	this->st.source = stream_file_open(conin, 1);
    }

    t = stream_get(this->st.source);

    if (t->type == EOF) {
	close_current(this);

	return token_set(&this->st.tok, TOK_EOA, NULL);
    }

    return t;
}



static void
close_current(struct stream_cat *this)
{
    if (this->st.source) {
	stream_close(this->st.source);
	/* fclose(this->cur); */
	this->st.source = NULL;
	this->cur = NULL;
    }
}