/*
 *  gcsd
 *
 *  gcsd the generic command sequencer daemon can be used to serialize
 *  commands sent over various paralell communication channels to a
 *  single command output. It can be seen as a multiplexer for any
 *  kind of communication between a single resource and various clients
 *  which want to submit commands to it or query information from it.
 *  gcsd is written in C and Lua. The goal is to provide an easy to
 *  understand high level API based on Lua which can be used to
 *  implement the business logic of the so formed multiplexer daemon.
 *
 *
 *  Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
 *                          Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of gcsd.
 *
 *  gcsd 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
 *  any later version.
 *
 *  gcsd 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 gcsd. If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "string_list.h"

void string_list_init(string_list_t* list)
{
  if(!list)
    return;

  list->first_ = NULL;
}

void string_list_clear(string_list_t* list)
{
  if(!list)
    return;

  while(list->first_) {
    string_list_element_t* tmp;
    tmp = list->first_;
    list->first_ = tmp->next_;
    if(tmp->string_)
      free(tmp->string_);
    free(tmp);
  }
}

int string_list_add(string_list_t* list, const char* string)
{
  if(!list)
    return -1;

  if(!list->first_) {
    list->first_ = malloc(sizeof(string_list_element_t));
    if(!list->first_)
      return -2;

    list->first_->next_ = 0;
    list->first_->string_ = strdup(string);
    if(!list->first_->string_) {
      free(list->first_);
      list->first_ = NULL;
      return -2;
    }
  }
  else {
    string_list_element_t* tmp = list->first_;
    while(tmp->next_)
      tmp = tmp->next_;

    tmp->next_  = malloc(sizeof(string_list_element_t));
    if(!tmp->next_)
      return -2;

    tmp->next_->next_ = 0;
    tmp->next_->string_ = strdup(string);
    if(!tmp->next_->string_) {
      free(tmp->next_);
      tmp->next_ = NULL;
      return -2;
    }
  }
  return 0;
}

void string_list_print(string_list_t* list, const char* head, const char* tail)
{
  if(!list)
    return;

  string_list_element_t* tmp = list->first_;
  while(tmp) {
    printf("%s%s%s", head, tmp->string_, tail);
    tmp = tmp->next_;
  }
}