file_writer.c

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file file_writer.c simple output plugin for testing purposes */
  20
  21 #include "para.h"
  22 #include "write.h"
  23 #include "string.h"
  24 #include "error.h"
  25
  26 /** data specific to the file writer */
  27 struct private_file_writer_data {
  28 /** the file descriptor of the output file */
  29 int fd;
  30 };
  31
  32 static int file_writer_open(struct writer_node *w)
  33 {
  34         struct private_file_writer_data *pfwd = para_calloc(
  35                 sizeof(struct private_file_writer_data));
  36         char *tmp = para_tmpname(), *home = para_homedir(),
  37                 *filename = make_message("%s/.paraslash/%s", home, tmp);
  38
  39         free(home);
  40         free(tmp);
  41         w->private_data = pfwd;
  42         pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
  43         free(filename);
  44         if (pfwd->fd >= 0)
  45                 return 8192;
  46         free(pfwd);
  47         return -E_FW_OPEN;
  48 }
  49
  50 static int file_writer_write(char *data, size_t nbytes, struct writer_node *wn)
  51 {
  52         struct private_file_writer_data *pfwd = wn->private_data;
  53         int ret = write(pfwd->fd, data, nbytes);
  54         if (ret < 0)
  55                 ret = -E_FW_WRITE;
  56         return ret;
  57 }
  58
  59 static void file_writer_close(struct writer_node *wn)
  60 {
  61         struct private_file_writer_data *pfwd = wn->private_data;
  62         close(pfwd->fd);
  63         free(pfwd);
  64 }
  65
  66 /** the init function of the file writer */
  67 void file_writer_init(struct writer *w)
  68 {
  69         w->open = file_writer_open;
  70         w->write = file_writer_write;
  71         w->close = file_writer_close;
  72         w->shutdown = NULL; /* nothing to do */
  73 }