labcomm2006_dynamic_buffer_writer.c

/*
  labcomm2006_dynamic_buffer_writer.c -- LabComm dynamic memory writer.

  Copyright 2006-2013 Anders Blomdell <anders.blomdell@control.lth.se>

  This file is part of LabComm.

  LabComm 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.

  LabComm 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 <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include "labcomm2006.h"
#include "labcomm2006_private.h"
#include "labcomm2006_ioctl.h"
#include "labcomm2006_dynamic_buffer_writer.h"

static int dyn_alloc(struct labcomm2006_writer *w, 
		     struct labcomm2006_writer_action_context *action_context)
{
  w->data_size = 1000;
  w->count = w->data_size;
  w->data = labcomm2006_memory_alloc(w->memory, 1, w->data_size);
  if (w->data == NULL) {
    w->error = -ENOMEM;
  }
  w->pos = 0;

  return w->error;
}

static int dyn_free(struct labcomm2006_writer *w, 
		    struct labcomm2006_writer_action_context *action_context)
{
  labcomm2006_memory_free(w->memory, 1, w->data);
  w->data = 0;
  w->data_size = 0;
  w->count = 0;
  w->pos = 0;
  labcomm2006_memory_free(w->memory, 0, action_context->context);
  return 0;
}

static int dyn_start(struct labcomm2006_writer *w, 
		     struct labcomm2006_writer_action_context *action_context,
		     int index,
		     const struct labcomm2006_signature *signature,
		     void *value)
{
  void *tmp;

  w->data_size = 1000;
  w->count = w->data_size;
  tmp = labcomm2006_memory_realloc(w->memory, 1, w->data, w->data_size);
  if (tmp != NULL) {
    w->data = tmp;
    w->error = 0;
  } else {