free.c

/*
** free.c for  in /home/jacqui_p/rendu/PSU_2016_malloc/
**
** Made by Pierre-Emmanuel Jacquier
** Login   <jacqui_p@epitech.eu>
**
** Started on  Mon Jan 30 11:07:14 2017 Pierre-Emmanuel Jacquier
** Last update Fri Feb 10 15:45:09 2017 Pierre-Emmanuel Jacquier
*/

#include "free.h"

void            free(void *ptr)
{
  t_memblock    *tmp;

  if (!ptr)
    return ;
  if (ptr > sbrk(0) || ptr < (void*)g_head)
    return ;
  tmp = (t_memblock *)ptr;
  tmp = tmp - 1;
  tmp->isfree = 1;
  block_fusion(tmp);
}

void    block_fusion(t_memblock *block)
{
  if (block->prev && block->prev->isfree)
    {
      block->prev->memsize = (block->memsize +
                              block->prev->memsize + META_DATA_SIZE);
      block->prev->next = block->next;
      if (block->next)
        block->next->prev = block->prev;
      block = block->prev;
    }
  if (block->next && block->next->isfree)
    {
      block->memsize = block->memsize +
        block->next->memsize + META_DATA_SIZE;
      block->next = block->next->next;
      if (block->next)
        block->next->prev = block;
    }
}